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SBEAMS – Proteomics& PeptideAtlas
Proteomics Analysis Database
Eric DeutschDay 5
October 20, 2006
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Outline
Topics
• Introduction to SBEAMS
• SBEAMS – Proteomics
• PeptideAtlas
• Tutorial and Exercises
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TPPTPP
xINTERACTxINTERACT
PeptideProphetPeptideProphet XPRESS/ASAPRatioLibra
XPRESS/ASAPRatioLibra
mzXML file formatmzXML file format
ProteinProphetProteinProphet
SBEAMSSBEAMS
Pep3DPep3DSEQUEST/COMETMascot/ProbID/SpectraST
SEQUEST/COMETMascot/ProbID/SpectraST
CytoscapeCytoscape
LC-MS/MS DataLC-MS/MS Data
protXML file formatprotXML file format
QualscoreQualscore
Gaggle…Gaggle…
XLinkXLink
pepXML file formatpepXML file format
PeptideAtlasPeptideAtlas
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SBEAMSSystems Biology Experiment Analysis Management System
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• Many databases for many Data Types– Many data types are generated and used at ISB, even as part of one
project (Proteomics, Microarray, Genotyping, Immunostain, Interactions, ...)
– Relational Database needed to keep track of it all– One grand unified database tough– Allow different databases to evolve under a common system using
common software, database engines, interface– Integration of different data types relatively easy to integrate in this
model
• Data Accessibility– Making data available to all levels of users– Reasonably simple web interface for data entry and queries– Client platform independence– UNIX command line interface for maintenance jobs and complex data
mining– Remote data access via HTTP for scripting and automation– Relational back-end, flavor independent
A Need for Custom Database Front End Software
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• A framework for writing software for collecting, storing, accessing, and integrating data produced by various experiments using a relational database
• Tools for creating web front end entering data, queries, triggering batch jobs
• Programming interface for maintenance jobs, data loading and retrieval scripts, and interactive applications
SBEAMSSystems Biology Experiment Analysis Management System
Interactive /Batch Job Server
db + others
Ad HocQueries
SBEAMS WebApplication Developers
SBEAMS AutomatedData Loading &
Maintenance Jobs
SBEAMS Dev &Custom App Users
SBEAMS WebApplication users
Web Serverhttp://db/
File Servers
SQL Engines
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• SBEAMS is designed as a core set of functionality around which individual modules can be built
• Each experiment or data type can have its own module
• Simultaneous “live” and development environments allow continual development
• Web interface accessible from any platform with a browser / no client installation
• Also UNIX command-line client and scriptable HTTP client API
SBEAMSSystems Biology Experiment Analysis Management System
IDC
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SBEAMSIntegration of data acquisition, management, and analysis tools
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SBEAMS – ProteomicsProteomics Analysis Database
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SBEAMS – Proteomics: Goals• Organize many projects/experiments/searches into relational
database schema• Tools to explore the search results similar to existing ways plus lots of
new ways including comparison of multiple experiments• Allow users to store annotations of search hits after personal
validation• Allow queries across multiple experiments to capitalize on previous
annotations• Designed for ISB high-throughput 2DLC mass-spec Proteomics
experiments• Manage data collection and analysis pipeline• Annotated Peptide Database: library of observed peptides including
their properties and conditions under which they were seen• Provide a platform for further software development and analysis• Integration with other modules/databases (e.g., Microarray)• Data visualization with Cytoscape
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SBEAMS – Proteomics: Main Features
• Project (Study) Information/Overview/Access Control• Experimental information storage/access• Comparison across experiments or search batches• Quantitation summaries for one or more experiments• Gene Ontology/InterPro annotation information• Browse search_hit (ID’ed peptides) with spectra + Xpress
• Various metrics: Peptide probability scores, Xcorr, calc pI, Xpress values, etc.
• Calculation of % ACN with gradient program information
• Browse possible tryptic peptides for biosequence sets• ProteinProphet output exploration• Annotated Peptide Database
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SBEAMS – ProteomicsPRO
• Central repository of organized data
• Annotate results and capitalize on annotations of others
• Queries to compare/combine experiments
• Queries to search for the needle in the haystack
• Write your own queries if you know/learn SQL
• Cytoscape integration
CON• Not a robust, streamlined
system• Needs lots of work• No full-time support• In some ways, harder to
“do your own thing”• Beware the resultset that
is different from what you thought you asked for
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SBEAMS – ProteomicsData Exports and Data Standards
• Resultsets can be exported to Excel, XML, CSV, TSV• Parts of the data model can be exported into XML format that
follows the SBEAMS – Proteomics schema but not a standard
• MIAME for Microarrays (Minimum Information About a Microarray Experiment) (Brazma et al. 2001)
• MAGE-OM/ML for Microarrays (MicroArray Gene Expression Object Model/Markup Language) (Spellman et al. 2002)
• mzXML & mzData• pepXML & protXML• PEDRo a first shot for Proteomics data model (Proteomics
Experiment Data Repository) (Taylor et al. 2003)• MIAPE, PSI-OM, AnalysisXML, Fuge – OM: in development
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SBEAMS – ProteomicsCurrent Status
• Still under development but being used regularly by several researchers
• Current installations: ISB internal, MacroGenics, SBRI, UW, Zurich
• Current stats for ISB instance:
8 x 1.5 GHz, 8 GB RAM, 1 TB disk125 GB database
225 M search_hits (possible peptides)8.1 M biosequences
25 M SEQUEST searches7100 MS runs
13.4 M MS/MS spectra380 experiments (samples)
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SBEAMS – ProteomicsAccessing the System (ISB internal site)
• http://db.systemsbiology.net/ and click on SBEAMS (SSL)
or just• https://db.systemsbiology.net/sbeams/• Access is via SSL from outside the firewall• Log on with your ISB username and either
Windows or UNIX password or else a special account needs to be set up for you
• Test Drive at http://www.sbeams.org/sbeams/
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How Can I Use It If Not at ISB?Installing SBEAMS at another site
Requirements:– SBEAMS Application Server
• Perl 5.6+ required• Web server required• Developed under Linux + Apache• Anecdotes of running it on Windows exist but not yet at ISB
– RDBMS (separate machine recommended but not required)• Developed on SQL Server• SBEAMS Core tested on MySQL and PostgreSQL• Proteomics module has not. Could be ported with some effort
– Database programmer• Effort in getting it installed at your site should not be
underestimated• And it will required on going management and development
Download It and Install It:– http://www.sbeams.org/
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Outline
Topics
• Introduction to SBEAMS
• SBEAMS – Proteomics
• PeptideAtlas
• Tutorial and Exercises
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PeptideAtlasBackground
• There are many shotgun proteomic datasets of which only a small part of the information potential has been used– Only a limited set of proteins were of interest– Analysis software is still far from optimal– Experiment did not properly address hypothesis and is unpublished
• What further benefit can be extracted from a large group of heterogeneous experiments?
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PeptideAtlasCombining Many Heterogeneous Experiments
Research Group 1 Research Group 3Research Group 2
ETC#5#4#3#2#1 ETC#5#4#3#2#1 ETC#5#4#3#2#1
Experiments
Data Analysis, Data ValidationData Analysis, Data Validation
Database
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PeptideAtlasWhat Is It?
• PeptideAtlas is the integration of a large number of uniformly processed tandem mass spec experimental results into a master list of observed peptides mapped to the genome
• Currently includes ~250 experiments from:– Aebersold lab– ISB Proteomics Facility (including data from external clients)– NHLBI Consortium members (Yale: Williams, JHU: Pandey)– Data from the Open Proteomics Database (OPD@UT: Marcotte)– Other contributors (Reising, Gygi, Haynes, Hogue, Conrads..)
• ISB is well suited to start this because of the large amount of in-house data and the general lack of publicly available data
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PeptideAtlasWhy?
• Genome Annotation:– Validating “predicted” proteins– Validating intron/exon boundaries and alternative splice forms– Validating the reference protein databases (e.g., we find many
peptides that don’t map to Ensembl)
• Experiment Planning:– Which proteins & peptides are observable with MS/MS– Targeted proteomics via inclusion lists
• Data Analysis Aid:– Use the web UI to examine whether a protein/peptide in your experiment
is already in the PeptideAtlas, which samples, how often, etc.– Faster MS/MS analysis using spectrum libraries
• Data Mining:– Exploring which peptides are seen and which are not– Exploring MS/MS spectral patterns
• Defining the (MS/MS observable) Proteome
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PeptidesSample Proteins
digestion
200200 400400 600600 8008001000100012001200m/zm/z
From Peptides to Genome Annotation
Spectrum Peptide Probability Spectrum 1 LGEYGH 1.0
… … …Spectrum N EIQKKF 0.3
BLASTprotein
database
statisticalfiltering
LC-MS/MSdatabasesearchextraction
Mass Spectrum
Peptides
visualization
PeptideAtlas DatabaseGenome Browser
Map togenome
Peptide … Chrom Start_Coord End_Coord …PAp00007336 … X 132217318 132217368 …
… … … … … …
SBEAMS
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http://www.peptideatlas.org/
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PeptideAtlas protein view page
Cytoscape view of proteins & peptides
proteins
ambiguously mapped peptideproteotypic peptidesNprot = 1 Nobs > 1EPS > 0.3
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http://www.ensembl.org/
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PeptideAtlas: Different builds
140012 k76 k0.5 M49788Halobacterium
13006 k63 k0.3 M1326Mouse
370035 k536 k4.1 M132646Yeast
180015 k1.2 M13.6 M38k45Human Plasma
900072 k522 k7.5 M176943Drosophila
800035,391334 k3.3 M151790Human All
Distinct Proteins
Distinct Peptides
ID P>0.9Searched Spectra
#MS
Runs
# Exps
Build
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Human Plasma PeptideAtlas
August 2006 Build:- 45 experiments- 13.6 million MS/MS spectra searched
Major contributors:- 2.7 million MS/MS spectra from HUPO PPP datasets- 1.8 million from NCI (National Cancer Institute)- 1.9 million from PNNL (Pacific Northwest National Lab)- 5.1 million from Novartis- 1.0 million from Cedars-Sinai (Mallick)- 0.7 million from ISB
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Human Plasma PeptideAtlas
Estimated FDR for peptides0.070.64
Genes after simple reduction of redundancy17254917Proteins after simple reduction of redundancy18125140All possible proteins mapped to32728736
Total distinct peptides mapping to reference12.6 k21.6 kTotal distinct peptides14.6 k23.6 k
MultobsAll pep
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Plasma ProteomeState of the Onion
479
-
316
62
257
Int 3020
538889States et al. (2006)
346 of 5381812HPPA 2006-08
960Deutsch et al. (2005)
3020Omenn et al. (2005)
9901175 (194) (92) (46)
Anderson et al (2004)
148210Zhou et al. (2004)
10191444Chan et al. (2004)
179800 / 1682Shen et al. (2004)
Int 889mappableN Proteins
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Comparison with Polanski & Anderson (2006) “Cancer Proteins”
• 1269 “candidate cancer biomarkers for targeted Proteomics”• 985 proteins that have useful accession and map to Ensembl• 192 have a reported plasma protein concentration• 394 (40%) of those have an entry in Plasma PeptideAtlas• 112 have concentration and are found in Plasma PeptideAtlas
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from Polanski & Anderson (2006)
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• Initial PeptideAtlas Publication:Frank Desiere, Eric W. Deutsch, Alexey I. Nesvizhskii, Parag Mallick, Nichole King, Jimmy K. Eng, ..."Integration of Peptide Sequences Obtained by High-Throughput Mass Spectrometry with the Human
Genome", Genome Biology 2004, 6:R9
• Human Plasma PeptideAtlas Publication:Eric W. Deutsch, Jimmy K. Eng, Hui Zhang, Nichole L. King, Alexey I. Nesvizhskii, ..."Human Plasma PeptideAtlas", Proteomics. 2005 Aug;5(13):3497-500
• Yeast PeptideAtlas:Nichole L. King, Eric W Deutsch, Jeff Ranish, Alexey I. Nesvizhskii, James S. Eddes, ..."Analysis of the S. cerevisiae proteome with PeptideAtlas“, Genome Biology, submitted
• Latest Update:Frank Desiere, Eric W. Deutsch, Nichole L. King, Alexey I. Nesvizhskii, Parag Mallick, Jimmy Eng, ..."The PeptideAtlas Project", Nucleic Acids Research, 2006, 34, D655-D658
PeptideAtlasPublications
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PeptideAtlasHow to use it
• Link to / paste in your (human, mouse, drosophila, yeast…) peptides or proteins of interest and see if they have been seen already and in what samples
• Download the PeptideAtlas build results and mine the data
• Contribute your data:– Published data. We’ll put it up in the repository for others to download– Unpublished data. We’ll include it in the PeptideAtlas with minimal
annotation– Human or Mouse data of most interest right now– Data from other organisms. We’ll take it, esp. Ensembl organisms– Preferably the raw files, we’ll run it through the pipeline here
• Start your own PeptideAtlas for your favorite organism– We plan on releasing all the tools to build your own PeptideAtlas
for whatever you want to do
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SBEAMS-Proteomics: Tutorial
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SBEAMS-Proteomics: Tips and Tricks
• Right click on a link and open it in a new window.
• In list boxes hit the first letter of your item one or more times to jump there.
• In a multi-select list box, hold down CTRL to select/deselect items
• Resultsets are sometimes down below out of sight when a page comes up. Check the up/down scroll bar to see if what you’re looking for is just out of sight below.