Mechanism of zinc-mediated inhibition of caspase-9.

Protein Science : a Publication of the Protein Society
Kristen L Huber, Jeanne A Hardy

Abstract

Zinc-mediated inhibition is implicated in global caspase regulation, with relief of zinc-mediated inhibition central to both small-molecule and natively induced caspase activation. As an initiator, caspase-9 regulates the upstream stages of the apoptotic caspase cascade, making it a critical control point. Here we identify two distinct zinc-binding sites on caspase-9. The first site, composed of H237, C239, and C287, includes the active site dyad and is primarily responsible for zinc-mediated inhibition. The second binding site at C272 is distal from the active site. Given the amino-acid conservation in both regions, these sites appear to be present across the caspase family underscoring the importance of zinc-mediated regulation of this class of enzymes.

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