2ckl

From Proteopedia

Revision as of 15:06, 30 October 2007

RING1B-BMI1 E3 CATALYTIC DOMAIN STRUCTURE

Overview

Polycomb group proteins Ring1b and Bmi1 (B-cell-specific Moloney murine, leukaemia virus integration site 1) are critical components of the, chromatin modulating PRC1 complex. Histone H2A ubiquitination by the PRC1, complex strongly depends on the Ring1b protein. Here we show that the, E3-ligase activity of Ring1b on histone H2A is enhanced by Bmi1 in vitro., The N-terminal Ring-domains are sufficient for this activity and Ring1a, can replace Ring1b. E2 enzymes UbcH5a, b, c or UbcH6 support this activity, with varying processivity and selectivity. All four E2s promote, autoubiquitination of Ring1b without affecting E3-ligase activity. We, solved the crystal structure of the Ring-Ring heterodimeric complex of, Ring1b and Bmi1. In the structure the arrangement of the Ring-domains is, ... [(full description)]

About this Structure

2CKL is a [Protein complex] structure of sequences from [Mus musculus] with ZN and IOD as [ligands]. Structure known Active Site: AC1. Full crystallographic information is available from [OCA].

Reference

Structure and E3-ligase activity of the Ring-Ring complex of polycomb proteins Bmi1 and Ring1b., Buchwald G, van der Stoop P, Weichenrieder O, Perrakis A, van Lohuizen M, Sixma TK, EMBO J. 2006 Jun 7;25(11):2465-74. Epub 2006 May 18. PMID:16710298

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