Global sequencing of proteolytic cleavage sites in apoptosis by specific labeling of protein N termini.
Global sequencing of proteolytic cleavage sites in apoptosis by specific labeling of protein N termini.
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DOI:
10.1016/j.cell.2008.08.012
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发表时间:
2008-09-05
期刊:
影响因子:
64.5
通讯作者:
Wells JA
中科院分区:
文献类型:
--
作者:
Mahrus S;Trinidad JC;Barkan DT;Sali A;Burlingame AL;Wells JA
The nearly 600 proteases in the human genome regulate a diversity of biological processes, including programmed cell death. Comprehensive characterization of protease signaling in complex biological samples is limited by available proteomic methods. We have developed a general approach for global identification of proteolytic cleavage sites based on enzymatic biotinylation of free protein N-termini and positive enrichment of corresponding N-terminal peptides. Using this method to study apoptosis, we have sequenced 333 caspase-like cleavage sites distributed among 292 protein substrates. These sites are generally not predicted by in vitro caspase substrate specificity, but can be used to predict other physiological caspase cleavage sites. Structural bioinformatic studies show that caspase cleavage sites often appear in surface accessible loops and even occasionally in helical regions. Strikingly, we also find that a disproportionate number of caspase substrates physically interact, suggesting that these dimeric proteases target protein complexes and networks to elicit apoptosis.
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