Thermo Fisher Scientific Protein User guide

Type
User guide
Thermo
Protein
Deconvolution
Version 2.0
User Guide
XCALI-97414 Revision A August 2012
© 2012 Thermo Fisher Scientific Inc. All rights reserved.
ReSpect is a trademark of Positive Probability Ltd.
Xcalibur is a registered trademark of Thermo Fisher Scientific Inc. in the United States.
Microsoft, Excel, PowerPoint, Visual C++, and Windows are registered trademarks of Microsoft Corporation
in the United States and other countries. Adobe and Acrobat are registered trademarks of Adobe Systems Inc.
in the United States and other countries.
All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.
Thermo Fisher Scientific Inc. provides this document to its customers with a product purchase to use in the
product operation. This document is copyright protected and any reproduction of the whole or any part of this
document is strictly prohibited, except with the written authorization of Thermo Fisher Scientific Inc.
The contents of this document are subject to change without notice. All technical information in this
document is for reference purposes only. System configurations and specifications in this document supersede
all previous information received by the purchaser.
Thermo Fisher Scientific Inc. makes no representations that this document is complete, accurate or error-
free and assumes no responsibility and will not be liable for any errors, omissions, damage or loss that might
result from any use of this document, even if the information in the document is followed properly.
This document is not part of any sales contract between Thermo Fisher Scientific Inc. and a purchaser. This
document shall in no way govern or modify any Terms and Conditions of Sale, which Terms and Conditions of
Sale shall govern all conflicting information between the two documents.
Release history: Revision A, August 2012
Software version: Thermo Protein Deconvolution 2.0.0 and later, Thermo Foundation 2.0 and later, Microsoft
Windows 7 Professional 32-bit Service Pack 1
For Research Use Only. Not for use in diagnostic procedures.
Thermo Scientific Protein Deconvolution User Guide iii
C
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
Activating a Protein Deconvolution License . . . . . . . . . . . . . . . . . . . . . . . . . . .viii
Activating a Permanent License for a New Installation . . . . . . . . . . . . . . . . .viii
Activating a Permanent License When Upgrading to a New Release . . . . . . . . x
Safety and Special Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Contacting Us . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xi
Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Xtract Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ReSpect Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Manual and Automatic Deconvolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chromatographic Peak Detection and Spectral Peak Modeling . . . . . . . . . . . . 4
Workflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Inputs and Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Starting the Protein Deconvolution Application . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifying the Default RAW File Directory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Adjusting the Pane Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Exiting the Protein Deconvolution Application. . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 3 Manually Deconvolving Isotopically Resolved Mass Spectra with the
Xtract Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Setting Up a Manual Xtract Protein Deconvolution . . . . . . . . . . . . . . . . . . . . . 13
Method Selection Page Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Creating an Xtract Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Parameters Page Parameters for the Xtract Algorithm . . . . . . . . . . . . . . . . . . 26
Menu Bar Commands on the Parameters Page . . . . . . . . . . . . . . . . . . . . . . . 34
Contents
Contents
iv Protein Deconvolution User Guide Thermo Scientific
Selecting the Spectrum to Deconvolve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Chromatogram Page Parameters for the Xtract Algorithm. . . . . . . . . . . . . . . 42
Menu Bar Commands on the Chromatogram Page. . . . . . . . . . . . . . . . . . . . 44
Chromatogram Pane Shortcut Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Chromatogram Pane Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Source Spectrum Pane Shortcut Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Source Spectrum Pane Header. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Deconvolving the Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Process and Review Page Parameters for the Xtract Algorithm. . . . . . . . . . . . 48
Menu Bar Commands on the Process and Review Page. . . . . . . . . . . . . . . . . 51
Displaying the Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Displaying an Xtract Deconvolution Report . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Reporting Page Toolbar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Sample Information Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Chromatogram Parameters Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Source Chromatogram Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Source Spectrum Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Main Parameters (Xtract) Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Advanced Parameters (Xtract) Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Deconvolved Spectrum Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Xtract Masses Table Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Source Spectrum Evidence Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Loading Saved Xtract Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Chapter 4 Automatically Deconvolving Isotopically Resolved Mass Spectra with the
Xtract Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Setting Up an Automatic Xtract Protein Deconvolution . . . . . . . . . . . . . . . . . . 73
Running Jobs in the Queue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Run Queue Page Parameters for Automatic Xtract Deconvolution . . . . . . . . 80
Displaying the Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Result Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Displaying an Xtract Deconvolution Report . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Loading Saved Xtract Results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Chapter 5 Manually Deconvolving Isotopically Unresolved Mass Spectra with the
ReSpect Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Setting Up a Manual ReSpect Protein Deconvolution. . . . . . . . . . . . . . . . . . . . 87
Method Selection Page Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Creating a ReSpect Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Parameters Page Parameters for the ReSpect Algorithm. . . . . . . . . . . . . . . . 101
Menu Bar Commands on the Parameters Page . . . . . . . . . . . . . . . . . . . . . . 113
Contents
Thermo Scientific Protein Deconvolution User Guide v
Selecting the Spectrum to Deconvolve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Obtaining the Best Results with the ReSpect Algorithm . . . . . . . . . . . . . . . 120
Chromatogram Page Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Menu Bar Commands on the Chromatogram Page. . . . . . . . . . . . . . . . . . . 123
Chromatogram Pane Shortcut Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Chromatogram Pane Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Source Spectrum Pane Shortcut Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Source Spectrum Pane Header. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Deconvolving the Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Process and Review Page Parameters for the ReSpect Algorithm . . . . . . . . . 127
Menu Bar Commands on the Process and Review Page. . . . . . . . . . . . . . . . 129
Displaying the Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Displaying a ReSpect Deconvolution Report. . . . . . . . . . . . . . . . . . . . . . . . . . 135
Reporting Page Toolbar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Sample Information Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Chromatogram Parameters Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Source Chromatogram Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Source Spectrum Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Main Parameters (ReSpect) Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Advanced Parameters (ReSpect) Section . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Deconvolved Spectrum Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
ReSpect Masses Table Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Source Spectrum Evidence Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Loading Saved ReSpect Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Chapter 6 Automatically Deconvolving Isotopically Unresolved Mass Spectra with
the ReSpect Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Setting Up an Automatic ReSpect Protein Deconvolution . . . . . . . . . . . . . . . 150
Running Jobs in the Queue. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Run Queue Page Parameters for Automatic ReSpect Deconvolution. . . . . . 157
Displaying the Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Result Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Displaying a ReSpect Deconvolution Report. . . . . . . . . . . . . . . . . . . . . . . . . . 161
Loading Saved Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
Thermo Scientific Protein Deconvolution User Guide vii
P
Preface
This guide describes how to use the Thermo Protein Deconvolution application to
deconvolve mass spectra.
Related Documentation
The Protein Deconvolution application includes Help and these manuals as PDF files:
Protein Deconvolution User Guide
Protein Deconvolution Quick Start Guide
To view product manuals
•Go to Start > All Programs > Thermo Protein Deconvolution > Manuals.
From the Protein Deconvolution window, choose Help > Manuals.
To open Help
From the Protein Deconvolution window, choose Help > Protein Deconvolution Help.
If available for a specific window or dialog box, click Help or press F1 for information
about setting parameters.
Contents
Related Documentation
System Requirements
Activating a Protein Deconvolution License
Safety and Special Notices
Contacting Us
Preface
viii Protein Deconvolution User Guide Thermo Scientific
System Requirements
The Protein Deconvolution application requires a license. In addition, your system must meet
these minimum requirements.
Activating a Protein Deconvolution License
If you are a new user, you must activate a Protein Deconvolution license before you can use
the application to deconvolve a spectrum. If you are a current user, you can activate a trial
license for 61 days before you activate a permanent license. When you upgrade to a newer
release from the current release, you have 61 days before you are required to obtain a new
license.
Activating a Permanent License for a New Installation
If you do not have an existing release of the Protein Deconvolution application installed,
follow this procedure.
To activate a permanent Protein Deconvolution license
1. Start the Protein Deconvolution application by following the instructions in “Starting the
Protein Deconvolution Applicationon page 6.
The License Activation dialog box appears, as shown in Figure 1.
Figure 1. License Activation dialog box
2. Click Activate Now.
The About Thermo Protein Deconvolution dialog box opens, as shown in Figure 2.
System Requirements
Hardware 2 GHz processor with 1 GB RAM
•CD-ROM drive
Video card and monitor capable of 1280 1024 resolution (XGA)
75 GB available on the C: drive
•NTFS format
Software Microsoft™ Windows™ 7 Professional 32-bit Service Pack 1
(Optional) Thermo Xcalibur™ 2.2 SP1
Preface
Thermo Scientific Protein Deconvolution User Guide ix
Figure 2. About Thermo Protein Deconvolution dialog box
3. Click Activate Now.
Another License Activation dialog box opens, as shown in Figure 3.
Figure 3. License Activation dialog box
4. Complete all the boxes in the User Info area.
5. In the Barcode box, type the bar code, which you can find on the back of the DVD case.
Preface
xProtein Deconvolution User Guide Thermo Scientific
6. In the Product list, select ProteinDeconvolution_All.
After you complete the information in the User Info and Feature Info areas, code similar
to that shown in Figure 3 appears in the License Text box.
7. Select the text in the License Text box, click Copy, paste the copied text into an e-mail,
and send it to [email protected].
You will receive a license e-mail within two business days.
8. When you receive your license e-mail, copy the text from the body of the e-mail, place the
cursor in the License Text box of the License Activation dialog box, and click Paste.
The Set button now becomes available.
9. Click Set.
The Protein Deconvolution window shown in Figure 7 on page 7 now opens.
Activating a Permanent License When Upgrading to a New Release
If you already have the Protein Deconvolution application installed but do not want to
upgrade immediately to a new release because waiting for the new license might impact your
work, you can use a trial license for 61 days before you activate a permanent license. However,
be sure to activate the software within this time period so that the license does not expire.
To activate a permanent Protein Deconvolution license when upgrading to a new
release
1. Start the Protein Deconvolution application by following the instructions in “Starting the
Protein Deconvolution Applicationon page 6.
The License Activation dialog box appears, as shown in Figure 1 on page viii.
2. In the License Activation dialog box, click Activate Later.
The Protein Deconvolution window shown in Figure 7 on page 7 opens.
At the end of the 61 days, you still have access to the Load Results function of the
application (see “Loading Saved Xtract Resultson page 70 for Xtract or “Loading Saved
ReSpect Resultson page 147 for ReSpect). However, you do not have access to the
Xtract or ReSpect algorithm.
3. If you want to obtain a permanent license after the trial license expires, choose Help >
About Protein Deconvolution in the upper right corner of the Protein Deconvolution
window.
4. Go to step 3 on page page ix of Activating a Permanent License for a New Installation.
Note Make sure there are no spaces in the License Text code. Use Microsoft Notepad
to remove any spaces.
Preface
Thermo Scientific Protein Deconvolution User Guide xi
Safety and Special Notices
Make sure you follow the precautionary statements presented in this guide. The safety and
other special notices appear in boxes.
Safety and special notices include the following:
Contacting Us
There are several ways to contact Thermo Fisher Scientific for the information you need.
To contact Technical Support
Find software updates and utilities to download at mssupport.thermo.com.
To contact Customer Service for ordering information
To get local contact information for sales or service
Go to www.thermoscientific.com/wps/portal/ts/contactus.
CAUTION Highlights hazards to humans, property, or the environment. Each CAUTION
notice is accompanied by an appropriate CAUTION symbol.
IMPORTANT Highlights information necessary to prevent damage to software, loss of
data, or invalid test results; or might contain information that is critical for optimal
performance of the system.
Note Highlights information of general interest.
Tip Highlights helpful information that can make a task easier.
Phone 800-532-4752
Fax 561-688-8736
E-mail us.techsupport.analyze@thermofisher.com
Knowledge base www.thermokb.com
Phone 800-532-4752
Fax 561-688-8731
E-mail us.customer-support.analyze@thermofisher.com
Web site www.thermo.com/ms
Preface
xii Protein Deconvolution User Guide Thermo Scientific
To copy manuals from the Internet
Go to mssupport.thermo.com, agree to the Terms and Conditions, and then click
Customer Manuals in the left margin of the window.
To suggest changes to documentation or to Help
Fill out a reader survey online at www.surveymonkey.com/s/PQM6P62.
Send an e-mail message to the Technical Publications Editor at
techpubs-lcms@thermofisher.com.
Thermo Scientific Protein Deconvolution User Guide 1
1
Introduction
This chapter describes the purpose, features, workflows, inputs, and outputs of the Protein
Deconvolution application. It also explains how to start and exit the application, activate a
Protein Deconvolution license, and specify a default RAW file directory.
Features
Electrospray ionization (ESI) of intact peptides and proteins produces mass spectra that
contain series of multiply charged ions with associated mass-to-charge (m/z) ratios. The
resulting spectrum is complex and difficult to interpret, requiring mathematical algorithms
for the analysis of the data. Through a process called deconvolution, the Protein
Deconvolution application uses such algorithms to transform a charge state series into a
molecular mass. The application identifies multiple peaks in the mass spectrum associated
with different charge states of the same component and displays information about the masses
and abundance of that component. For example, peaks at 1000 m/z, 1111 m/z, and 1250 m/z
might be the charge states 10, 9, and 8 for a protein with a mass of 10 000 Da.
The Protein Deconvolution application includes two independent deconvolution algorithms
for mass spectral data:
Xtract, which deconvolves isotopically resolved mass spectra, that is, spectra in which it is
possible to distinguish separate peaks for different isotopic compositions of the same
component
Contents
Features
Workflow
Inputs and Outputs
Starting the Protein Deconvolution Application
Specifying the Default RAW File Directory
Adjusting the Pane Size
Exiting the Protein Deconvolution Application
1 Introduction
Features
2Protein Deconvolution User Guide Thermo Scientific
ReSpect™, which deconvolves isotopically unresolved (or unseparated) mass spectra, that
is, spectra in which it is not possible to distinguish the separate peaks for different isotopic
compositions of the same component
Whether mass spectra are isotopically resolved or unresolved depends not on the specific
instrument model but on the resolution of the instrument, the mass of the compounds
involved, and the details of the experiment run.
In addition, you can use the Protein Deconvolution application to do the following:
Produce more than one deconvolved spectrum for any given mass spectrum.
Perform a manual or automated deconvolution.
Generate a report containing the deconvolved spectrum and the mass spectrometry
evidence for it.
Xtract Algorithm
The Xtract algorithm uses a fitting scheme similar to the THRASH algorithm to deconvolve
and deisotope isotopically resolved mass spectra of peptides and proteins. First, it examines a
cluster of isotopically resolved peaks and uses the peak spacing of a cluster to determine an
initial estimate of the mass of the relevant component. Then it fits an averagine distribution to
the observed peak profile in that cluster to determine the monoisotopic mass that best
reproduces that profile. Finally, it combines results for all observed charge states for each mass
component to produce a single mass value for that component. The resulting spectrum shows
only the monoisotopic masses for the components that the algorithm identified.
When used properly, the Xtract algorithm reduces spectral noise and provides a high-intensity
mass spectrum of monoisotopic peaks. You can use the results table, called the monoisotopic
mass list, of the deconvolved mass-spectral peaks or the extracted spectra (not the original
MS/MS spectra) as the input to various search engines.
Figure 4 shows an isotopically resolved mass spectrum.
Figure 4. Isotopically resolved mass spectrum
1 Introduction
Features
Thermo Scientific Protein Deconvolution User Guide 3
ReSpect Algorithm
The ReSpect algorithm from Positive Probability, Ltd. (PPL) is a robust and efficient
data-fitting method that deconvolves isotopically unresolved complex mass spectra from
biomolecules, such as small and large proteins, to the neutral average mass of each molecule. It
determines the m/z of every peak in an ESI mass spectrum and evaluates all possible charge
states for any particular peak as determined by the mass ranges.
Given a theoretical model, it returns the least-squares best fit to the data by adjusting the
model parameters. It fits the data only within the datas errors or noise level to avoid
overfitting. For realistic solutions, the ReSpect algorithm constrains the parameters to be
non-negative.
For analyzing spectra, the ReSpect algorithm includes an optional spectrum preconditioning
method, including automated baseline subtraction, and a number of automated and
semiautomated peak-modeling facilities.
The ReSpect algorithm first performs a baseline subtraction. Next it performs a peak
deconvolution to produce a list of peaks, and then it filters these peaks. Lastly, it performs a
charge deconvolution to convert the remaining peaks from a mass-to-charge spectrum to a
mass spectrum. The ReSpect algorithm uses peak spacing patterns, which are indicative of
mass, to determine what the average mass should be.
The ReSpect algorithm can accommodate both low-charge-state spectra and data with a low
signal-to-noise ratio, so it does not require high-quality data to produce meaningful results.
You can use it to confirm molecular masses of proteins.
Figure 5 shows an isotopically unresolved mass spectrum.
Figure 5. Isotopically unresolved mass spectrum
Manual and Automatic Deconvolution
You can run the Protein Deconvolution application in manual or automatic mode.
In manual mode, you generate the chromatogram, select the chromatographic peaks,
deconvolve the spectra with the ReSpect or Xtract algorithm, and report the results
separately, one step at a time.
1 Introduction
Workflow
4Protein Deconvolution User Guide Thermo Scientific
In automatic mode, the Protein Deconvolution application detects chromatographic
peaks, extracts averaged mass spectra, deconvolves unresolved or resolved isotope peptides
or proteins, and generates a component list—all in a single step without any intervention.
You can place up to 1000 samples in the run queue for automatic processing.
You might want to run the Protein Deconvolution application manually when something
about your workflow changes and you want to determine the optimal settings for selecting the
chromatographic peaks, deconvolving the spectrum, or both. For example, you might
introduce a new protein, a new chromatographic setup, or different mass spectrometry
settings. Once you determine the optimal settings, you can save the new method and use the
automatic processing from then on for subsequent analyses for that type of sample.
Chromatographic Peak Detection and Spectral Peak Modeling
In manual deconvolution, you select the spectrum to deconvolve. In automatic
deconvolution, the Protein Deconvolution application uses the Component Detection
Library (CDL) peak detection algorithm to analyze the raw data and to separate peaks from
noise in chromatograms. This algorithm does the following to locate peaks in a
chromatogram:
Constructs a chromatogram after applying any user-supplied scan or mass filters. It also
creates a report.
Assigns peak numbers.
Generates a peak list.
Determines the peak start and peak end points.
To locate peaks in spectra, the ReSpect algorithm fits a peak model to the spectrum to locate
potential peaks. This peak model resembles a Gaussian distribution. You can control the
characteristics of this peak model by modifying the relevant parameters on the Parameters
page of the Protein Deconvolution window.
Workflow
Figure 6 shows the workflow to follow to manually deconvolve mass spectra with the Protein
Deconvolution application. The workflow is nearly the same for the Xtract algorithm as it is
for the ReSpect algorithm.
You can select the chromatogram to deconvolve either in the Protein Deconvolution
application or in the Qual Browser utility, which is part of the Xcalibur data system. When
transferring data—for example, in an e-mail—to submit to the Protein Deconvolution
application, you might want to reduce the amount of data to transfer by using Qual Browser
to select either a single spectrum or an averaged spectrum. For instructions on using Qual
Browser to select a chromatogram, refer to the Thermo Xcalibur Qualitative Analysis User
Guide.
1 Introduction
Workflow
Thermo Scientific Protein Deconvolution User Guide 5
Figure 6. Protein Deconvolution manual workflow
Apply the Xtract or
ReSpect algorithm.
Select a RAW file.
Does RAW file
contain LC/MS data or
a single spectrum?
LC/MS data
Is spectrum suitable
for deconvolution?
Zoom chromatogram
peak of interest.
Extract an average spectrum
across the peak or choose a
single scan from peak.
Generate chromatogram
(TIC, base peak) of the
compound of interest.
Evaluate raw results or
de-isotope results.
Generate report and save
results.
Is component of
interest present?
Single spectrum
(generated in
Qual Browser)
No
Yes
No
Yes
1 Introduction
Inputs and Outputs
6Protein Deconvolution User Guide Thermo Scientific
Inputs and Outputs
The Protein Deconvolution application can accept the following input and generate the
following output.
Inputs
The input file to the Protein Deconvolution application is the RAW file from a mass
spectrometry experiment. The RAW file can contain LC/MS data or a spectrum only.
You can use the Protein Deconvolution application with data from Exactive™, Orbitrap™, and
FTMS mass spectrometers.
Outputs
As output, the Protein Deconvolution application produces a deconvolved spectrum and peak
information. It generates the following:
A report on the results of the deconvolution that appears on the Reporting page of the
Protein Deconvolution window. For information on the specific contents of this report,
see “Displaying an Xtract Deconvolution Report” on page 58 for the Xtract algorithm
and “Displaying a ReSpect Deconvolution Report” on page 135 for the ReSpect
algorithm. You can save this report in a PDF file.
An SQLite file that contains both the parameter settings that you applied to the RAW file
and the results of the deconvolution. These results appear in the Results pane of the
Process and Review page. When you want to view the results in another Protein
Deconvolution session, you can select Load Results on the Protein Deconvolution
window to load the SQLite file and display the results of the deconvolution. For more
information on loading previous results, refer to “Loading Saved Xtract Resultson
page 70 or “Loading Saved ReSpect Results” on page 147.
Starting the Protein Deconvolution Application
To start the Protein Deconvolution application
Choose Start > All Programs > Thermo Protein Deconvolution or double-click the
Protein Deconvolution icon, .
The Protein Deconvolution window appears with the Method Selection page selected, as
shown in Figure 7.
1 Introduction
Specifying the Default RAW File Directory
Thermo Scientific Protein Deconvolution User Guide 7
Figure 7. Method Selection page of the Protein Deconvolution window
Specifying the Default RAW File Directory
You can specify the default directory where you want to store your RAW files.
To specify the default directory for your RAW files
1. Click the Global Settings icon, , in the upper right corner of the Protein
Deconvolution window, to activate the Global Settings dialog box, shown in Figure 8.
1 Introduction
Adjusting the Pane Size
8Protein Deconvolution User Guide Thermo Scientific
Figure 8. Global Settings dialog box
2. In the Raw Data Directory box, click the Browse button (...) to browse to the appropriate
directory.
3. Click Apply.
Adjusting the Pane Size
You cannot collapse the panes on the pages of the Protein Deconvolution window except for
the following panes on the Process and Review page:
Main Parameters (Xtract) or Main Parameters (ReSpect)
Saved Xtract Results or Saved ReSpect Results
You can collapse each of these panes by clicking the double up arrow, . To expand a pane,
click the double down arrow, .
You can also vertically resize many of the panes on the pages of the application, except for
those just listed.
To adjust the pane size vertically
Drag the white splitter bar above each pane up or down.
Figure 9 shows the location of the splitter bars.
  • Page 1 1
  • Page 2 2
  • Page 3 3
  • Page 4 4
  • Page 5 5
  • Page 6 6
  • Page 7 7
  • Page 8 8
  • Page 9 9
  • Page 10 10
  • Page 11 11
  • Page 12 12
  • Page 13 13
  • Page 14 14
  • Page 15 15
  • Page 16 16
  • Page 17 17
  • Page 18 18
  • Page 19 19
  • Page 20 20
  • Page 21 21
  • Page 22 22
  • Page 23 23
  • Page 24 24
  • Page 25 25
  • Page 26 26
  • Page 27 27
  • Page 28 28
  • Page 29 29
  • Page 30 30
  • Page 31 31
  • Page 32 32
  • Page 33 33
  • Page 34 34
  • Page 35 35
  • Page 36 36
  • Page 37 37
  • Page 38 38
  • Page 39 39
  • Page 40 40
  • Page 41 41
  • Page 42 42
  • Page 43 43
  • Page 44 44
  • Page 45 45
  • Page 46 46
  • Page 47 47
  • Page 48 48
  • Page 49 49
  • Page 50 50
  • Page 51 51
  • Page 52 52
  • Page 53 53
  • Page 54 54
  • Page 55 55
  • Page 56 56
  • Page 57 57
  • Page 58 58
  • Page 59 59
  • Page 60 60
  • Page 61 61
  • Page 62 62
  • Page 63 63
  • Page 64 64
  • Page 65 65
  • Page 66 66
  • Page 67 67
  • Page 68 68
  • Page 69 69
  • Page 70 70
  • Page 71 71
  • Page 72 72
  • Page 73 73
  • Page 74 74
  • Page 75 75
  • Page 76 76
  • Page 77 77
  • Page 78 78
  • Page 79 79
  • Page 80 80
  • Page 81 81
  • Page 82 82
  • Page 83 83
  • Page 84 84
  • Page 85 85
  • Page 86 86
  • Page 87 87
  • Page 88 88
  • Page 89 89
  • Page 90 90
  • Page 91 91
  • Page 92 92
  • Page 93 93
  • Page 94 94
  • Page 95 95
  • Page 96 96
  • Page 97 97
  • Page 98 98
  • Page 99 99
  • Page 100 100
  • Page 101 101
  • Page 102 102
  • Page 103 103
  • Page 104 104
  • Page 105 105
  • Page 106 106
  • Page 107 107
  • Page 108 108
  • Page 109 109
  • Page 110 110
  • Page 111 111
  • Page 112 112
  • Page 113 113
  • Page 114 114
  • Page 115 115
  • Page 116 116
  • Page 117 117
  • Page 118 118
  • Page 119 119
  • Page 120 120
  • Page 121 121
  • Page 122 122
  • Page 123 123
  • Page 124 124
  • Page 125 125
  • Page 126 126
  • Page 127 127
  • Page 128 128
  • Page 129 129
  • Page 130 130
  • Page 131 131
  • Page 132 132
  • Page 133 133
  • Page 134 134
  • Page 135 135
  • Page 136 136
  • Page 137 137
  • Page 138 138
  • Page 139 139
  • Page 140 140
  • Page 141 141
  • Page 142 142
  • Page 143 143
  • Page 144 144
  • Page 145 145
  • Page 146 146
  • Page 147 147
  • Page 148 148
  • Page 149 149
  • Page 150 150
  • Page 151 151
  • Page 152 152
  • Page 153 153
  • Page 154 154
  • Page 155 155
  • Page 156 156
  • Page 157 157
  • Page 158 158
  • Page 159 159
  • Page 160 160
  • Page 161 161
  • Page 162 162
  • Page 163 163
  • Page 164 164
  • Page 165 165
  • Page 166 166
  • Page 167 167
  • Page 168 168
  • Page 169 169
  • Page 170 170
  • Page 171 171
  • Page 172 172
  • Page 173 173
  • Page 174 174
  • Page 175 175
  • Page 176 176
  • Page 177 177
  • Page 178 178

Thermo Fisher Scientific Protein User guide

Type
User guide

Ask a question and I''ll find the answer in the document

Finding information in a document is now easier with AI