Protein bioinformatics and systems biology Nathan Edwards Department of Biochemistry and Molecular & Cellular Biology Georgetown University Medical Center.

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Presentation transcript:

Protein bioinformatics and systems biology Nathan Edwards Department of Biochemistry and Molecular & Cellular Biology Georgetown University Medical Center

2 Unannotated Splice Isoform

3

4 Halobacterium sp. NRC-1 ORF: GdhA1 K-score E-value vs 10% FDR Many peptides inconsistent with annotated translation start site of NP_279651

5 PepArML Meta-Search Engine NSF TeraGrid CPUs Edwards Lab Scheduler & 80+ CPUs Secure communication Heterogeneous compute resources Single, simple search request Scales easily to 250+ simultaneous searches X!Tandem, KScore, OMSSA, MyriMatch, Mascot (1 core). X!Tandem, KScore, OMSSA, MyriMatch. Amazon AWS

False-Discovery-Rate Curves 6

7 PeptideMapper Web Service I’m Feeling Lucky

8 PeptideMapper Web Service I’m Feeling Lucky

If a tree falls in the forest… 9

Nascent polypeptide-associated complex subunit alpha Long form is "muscle-specific" Exon 3 is missing from short form Peptide identifications provide evidence for long form only 9 peptides are specific to long form 6 peptides are found in both isoforms Urn with balls of 15 different colors p-value of observed spectral counts: 7.3E-8 10

11 Top-down CID Protein Fragmentation from Y. rohdei Match to Y. pestis 50S Ribosomal Protein L32

12 Phyloproteomics of Y. rohdei Protein Sequence16S-rRNA Sequence

Example Glycopeptide CID Fragmentation Spectrum 13

Haptoglobin (HPT_HUMAN) NLFLNHSE*NATAK MVSHHNLTTGATLINE VVLHPNYSQVDIGLIK Haptoglobin standard 14 N-glycosylation motif (NX/ST) * Site of GluC cleavage Pompach et al. Journal of Proteome Research 11.3 (2012): 1728–1740.