Protein Structure Database for Structural Genomics

Group

Jessica LauDecember 13, 2004

M.S. Thesis Defense

• Bioinformatics is• Analysis of biological data: gene expression, DNA

sequence, protein sequence. • Data mining and management of biological information

through database systems.

• At the Northeast Structural Genomics Consortium, database management systems play a large role in its daily operation

• Data collection and mining of experimental results• Track target progress – status milestones• Exchange information with rest of the world

• My thesis presents work in database management systems at the NESG.

• Part 1: ZebaView• Part 2: Worm Structure Gallery• Part 3: Prototype of NESG Structure Gallery

• Zebaview is the official target list of the Northeast Structural Genomics Consortium

• Display summary table of NESG targets.– Status milestones– Protein properties: DNA and

protein sequences, molecular weight, isoelectric point

• New targets are curated and then uploaded to SPiNE.

• 11,284 targets from 88 organisms.

Family View

NESG Families

• Unfolded• Membrane• Core 50• Nf-kB

In PDB / Cloned Prokaryotic vs. Eukaryotic

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Target Summary Statistics

Success of soluble targets: Prokaryotic vs. Eukaryotic

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Selected Cloned Expressed Soluble Purified X-ray or NMR data collection In PDB

• 4,418 targets cloned• 141 structures• 3.4% successful targets

GO, Cellular Localization, and SignalP

• Search for targets that have • any of the three GO ontologies defined• no GO ontologies defined at all

116 NESG structures do not have Molecular Function defined

LOCTarget

• Secretory proteins require formation of disulfide bonds• Oxidative Folding needed for proper native folding

• 2,132 “Extracellular” NESG targets

Bovine ribonuclease A has four disulfide bonds to stabalize its 3-D structure.Mahesh Narayan, et al. (2000) Acc. Chem. Res., 33 (11), 805 -812.

SignalP

• mRNA are translated with signal peptide for cellular localization• Peptide is cleaved upon destination

• SignalP predicts cleavage of signal peptide• Removal of signal peptide gives proper native fold

Lodish et al. Molecular Cell Biology 4th edition, Figure 7.1 (2000)

Part 2 – Worm Structure Gallery

Caenorhabditis elegans– Widely studied model organism

• 2-3 weeks life span, small size (1.5-mm-long), ease of laboratory cultivation, transparent body

• Small genome, yet has complex organ systems similar to higher organisms: digestive, excretory, neuromuscular, reproductive systems

Donald Riddle et al, C. elegans II (1997)

Altun Z F and Hall DH. , Atlas of C. elegans Anatomy, Wormatlas (2002-2004)

System Components

• 22,653 C. elegans proteins• 42 experimentally determined

• 4 are from NESG• 24 homology models

• 14 are from NESG• 960 C. elegans proteins potentially modeled

• Uniprot: Pfam domain, Gene name, ORF name• PDB Coordinates• Structure Validation Report• Sequence similarities to proteins in PDB

Protein Structure Validation Software

• Suite of quality validation software– PROCHECK

• Quality of experimental data• Distribution of φ, ψ angles in Ramachandran plot

– MolProbity Clashscore• Number of H atom clashes per 1,000 atoms

• With respect to a set of scores from 129 high resolution X-ray crystal structures

• < 500 residues, of resolution <= 1.80 Å, R-factor <= 0.25 and R-free <= 0.28;

Bahattacharya, A et al. to be published

• Algorithm based on alignment between query and template sequences.– Regions of conserved

residues forms a set of constraints for modeling

• Sequence identity of 40% or more

• Good quality template

Homology Modeling Automatically (HOMA)

Bad alignment Bad model

Poor quality template Poor quality model

Quality scores of 3-D structures

Quality Z-scores - Homology Models vs. Experimentally Determined Structures

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Homology Models

Experimentally Determined Structures

Search

• Search for C. elegans proteins in local database.

• Keyword: “Ubiquitin” in any field

Results:72 C. elegans proteins2 Experimentally determined structures1 Homology model11 Potential models

Results:152 C. elegans proteins2 Experimentally determined structures1 Homology model19 Potential models

System Architecture• Java, Tomcat, MySQL, Perl.

Three-tier architecture

• Client: Web browser

• Application: JSP, Logic components, Data access components

• Data: MySQL

Part 3 – NESG Structure Gallery

• Structure files submitted by individual groups

• Structure information is entered into SPiNE manually

• Manually run PSVS and MolScript

• Structure files submitted by automated pipeline

• ADIT integrated with SPiNE for uniform format

• PSVS and images automatically generated

• Structure information from PSVS directly into SPiNE

• Archives structure files.

• Downloads– Structure Validation

Report– Structure related files

• Atomic coordinates• NMR constraints• NMR peak lists • Chemical shifts• Structure factor

• Annotation– Functional annotation

provided by other NESG members

– Uniprot– PDB coordinates file

• Reusing Java components from Worm Structure Gallery

– Enhance ZebaView performance to handle increased load and functionalities

– Integrate annotation from other protein and structure databases.

– Make modules available for other java-based applications within structural genomics.

– Develop a gallery for other organisms: yeast, fruit fly, human

– Continue specifications for the new NESG Structure Gallery

Advisor: Dr. Gaetano Montelione

Thanks to everyone at theProtein NMR lab and NESG!

Aneerban BhattacharyaJohn Everett

All the scientists who solved the structures!