2c9c

From Proteopedia

Revision as of 14:57, 30 October 2007

STRUCTURAL BASIS OF THE NUCLEOTIDE DRIVEN CONFORMATIONAL CHANGES IN THE AAA DOMAIN OF TRANSCRIPTION ACTIVATOR PSPF

Overview

Bacterial enhancer-binding proteins (EBP) activate transcription by, hydrolyzing ATP to restructure the sigma(54)-RNA polymerase-promoter, complex. We compare six high resolution structures (<2.1 A) of the AAA(+), domain of EBP phage shock protein F (PspF) including apo, AMPPNP, Mg(2+)-ATP, and ADP forms. These structures permit a description of the, atomic details underpinning the origins of the conformational changes, occurring during ATP hydrolysis. Conserved regions of PspF's AAA(+) domain, respond distinctively to nucleotide binding and hydrolysis, suggesting, functional roles during the hydrolysis cycle, which completely agree with, those derived from activities of PspF mutated at these positions. We, propose a putative atomic switch that is responsible for coupling, structural ... [(full description)]

About this Structure

2C9C is a [Single protein] structure of sequence from [Escherichia coli] with MG and ATP as [ligands]. Structure known Active Site: AC1. Full crystallographic information is available from [OCA].

Reference

Structural basis of the nucleotide driven conformational changes in the AAA+ domain of transcription activator PspF., Rappas M, Schumacher J, Niwa H, Buck M, Zhang X, J Mol Biol. 2006 Mar 24;357(2):481-92. Epub 2006 Jan 13. PMID:16430918

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