Novel Proteomics Strategy Brings Insight into the Prevalence of SUMO-2 Target Sites

被引:71
作者
Blomster, Henri A. [1 ,2 ]
Hietakangas, Ville [1 ,2 ]
Wu, Jianmin [3 ,4 ]
Kouvonen, Petri [1 ,2 ]
Hautaniemi, Sampsa [3 ,4 ]
Sistonen, Lea [1 ,2 ]
机构
[1] Abo Akad Univ, Turku Ctr Biotechnol, FI-20521 Turku, Finland
[2] Univ Turku, FI-20521 Turku, Finland
[3] Univ Helsinki, Computat Syst Biol Lab, Inst Biomed, FI-00014 Helsinki, Finland
[4] Univ Helsinki, Inst Biomed & Genome Scale Biol Res Program, FI-00014 Helsinki, Finland
基金
芬兰科学院;
关键词
HETEROGENEOUS NUCLEAR RIBONUCLEOPROTEINS; BROAD-SPECTRUM IDENTIFICATION; UBIQUITIN-PROTEASOME SYSTEM; CELL-PROLIFERATION; GENE ONTOLOGY; PROTEINS; CONJUGATION; SUMOYLATION; CYCLE; MOTIF;
D O I
10.1074/mcp.M800551-MCP200
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Small ubiquitin-like modifier (SUMO) is covalently conjugated to its target proteins thereby altering their activity. The mammalian SUMO protein family includes four members (SUMO-1-4) of which SUMO-2 and SUMO-3 are conjugated in a stress-inducible manner. The vast majority of known SUMO substrates are recognized by the single SUMO E2-conjugating enzyme Ubc9 binding to a consensus tetrapeptide (Psi KXE where Psi stands for a large hydrophobic amino acid) or extended motifs that contain phosphorylated or negatively charged amino acids called PDSM (phosphorylation-dependent sumoylation motif) and NDSM (negatively charged amino acid-dependent sumoylation motif), respectively. We identified 382 SUMO-2 targets using a novel method based on SUMO protease treatment that improves separation of SUMO substrates on SDS-PAGE before LC-ESI-MS/MS. We also implemented a software SUMOFI (SUMO motif finder) to facilitate identification of motifs for SUMO substrates from a user-provided set of proteins and to classify the substrates according to the type of SUMO-targeting consensus site. Surprisingly more than half of the substrates lacked any known consensus site, suggesting that numerous SUMO substrates are recognized by a yet unknown consensus site-independent mechanism. Gene ontology analysis revealed that substrates in distinct functional categories display strikingly different prevalences of NDSM sites. Given that different types of motifs are bound by Ubc9 using alternative mechanisms, our data suggest that the preference of SUMO-2 targeting mechanism depends on the biological function of the substrate. Molecular & Cellular Proteomics 8: 1382-1390, 2009.
引用
收藏
页码:1382 / 1390
页数:9
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