A substrate-driven allosteric switch that enhances PDI catalytic activity
Protein disulfide isomerase (PDI) is an oxidoreductase essential for folding proteins in the endoplasmic reticulum. The domain structure of PDI is a-b-b'-x-a', wherein the thioredoxin-like a and a' domains mediate disulfide bond shuffling and b and b' domains are substrate bindin...
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Published in | Nature communications Vol. 7; no. 1; pp. 12579 - 11 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
Nature Publishing Group
30.08.2016
Nature Portfolio |
Subjects | |
Online Access | Get full text |
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Summary: | Protein disulfide isomerase (PDI) is an oxidoreductase essential for folding proteins in the endoplasmic reticulum. The domain structure of PDI is a-b-b'-x-a', wherein the thioredoxin-like a and a' domains mediate disulfide bond shuffling and b and b' domains are substrate binding. The b' and a' domains are connected via the x-linker, a 19-amino-acid flexible peptide. Here we identify a class of compounds, termed bepristats, that target the substrate-binding pocket of b'. Bepristats reversibly block substrate binding and inhibit platelet aggregation and thrombus formation in vivo. Ligation of the substrate-binding pocket by bepristats paradoxically enhances catalytic activity of a and a' by displacing the x-linker, which acts as an allosteric switch to augment reductase activity in the catalytic domains. This substrate-driven allosteric switch is also activated by peptides and proteins and is present in other thiol isomerases. Our results demonstrate a mechanism whereby binding of a substrate to thiol isomerases enhances catalytic activity of remote domains. |
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Bibliography: | National Institute on Drug Abuse (NIDA) USDOE Office of Science (SC) Hemostasis and Thrombosis Research Society AC02-05CH11231; U54 HL112302; R01 HL125275; R01 HL112809; T32 HL007917; T32 HL16324-02; HL116324; DA032476; U54 HG005032 National Institutes of Health (NIH) National Heart, Lung, and Blood Institute (NHLBI) NIH Molecular Libraries Probe Production Centers Network (MLPCN) |
ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/ncomms12579 |