1o0l

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THE STRUCTURE OF BCL-W REVEALS A ROLE FOR THE C-TERMINAL RESIDUES IN MODULATING BIOLOGICAL ACTIVITY

Overview

Pro-survival Bcl-2-related proteins, critical regulators of apoptosis, contain a hydrophobic groove targeted for binding by the BH3 domain of the, pro-apoptotic BH3-only proteins. The solution structure of the, pro-survival protein Bcl-w, presented here, reveals that the binding, groove is not freely accessible as predicted by previous structures of, pro-survival Bcl-2-like molecules. Unexpectedly, the groove appears to be, occluded by the C-terminal residues. Binding and kinetic data suggest that, the C-terminal residues of Bcl-w and Bcl-x(L) modulate pro-survival, activity by regulating ligand access to the groove. Binding of the, BH3-only proteins, critical for cell death initiation, is likely to, displace the hydrophobic C-terminal region of Bcl-w and Bcl-x(L)., Moreover, Bcl-w does not act only by sequestering the BH3-only proteins., There fore, pro-survival Bcl-2-like molecules probably control the, activation of downstream effectors by a mechanism that remains to be, elucidated.

About this Structure

1O0L is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

The structure of Bcl-w reveals a role for the C-terminal residues in modulating biological activity., Hinds MG, Lackmann M, Skea GL, Harrison PJ, Huang DC, Day CL, EMBO J. 2003 Apr 1;22(7):1497-507. PMID:12660157

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