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Mol Cell. 2001 Sep;8(3):601-11.

Phosphorylation of bid by casein kinases I and II regulates its cleavage by caspase 8.

Author information

  • 1CNRS UPR 9023, Montpellier, France. desagher@montp.inserm.fr

Abstract

Bid plays an essential role in Fas-mediated apoptosis of the so-called type II cells. In these cells, following cleavage by caspase 8, the C-terminal fragment of Bid translocates to mitochondria and triggers the release of apoptogenic factors, thereby inducing cell death. Here we report that Bid is phosphorylated by casein kinase I (CKI) and casein kinase II (CKII). Inhibition of CKI and CKII accelerated Fas-mediated apoptosis and Bid cleavage, whereas hyperactivity of the kinases delayed apoptosis. When phosphorylated, Bid was insensitive to caspase 8 cleavage in vitro. Moreover, a mutant of Bid that cannot be phosphorylated was found to be more toxic than wild-type Bid. Together, these data indicate that phosphorylation of Bid represents a new mechanism whereby cells control apoptosis.

PMID:
11583622
[PubMed - indexed for MEDLINE]
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