2c96 | pdb_00002c96
STRUCTURAL BASIS OF THE NUCLEOTIDE DRIVEN CONFORMATIONAL CHANGES IN THE AAA DOMAIN OF TRANSCRIPTION ACTIVATOR PSPF
| |||||||||||||
| 2c96, resolution 1.80Å | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sites: | AC1 | ||||||||||||
| Ligands: | ATP | ||||||||||||
| Domains: | AAA, Sigma54_activat | ||||||||||||
| Resources: | FirstGlance, OCA, PDBsum, JenaLib, RCSB | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
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 changes in the nucleotide-binding site to the repositioning of the sigma(54)-interacting loops. Striking similarities in nucleotide-specific conformational changes and atomic switch exist between PspF and the large T antigen helicase, suggesting conservation in the origin of those events amongst AAA(+) proteins.
About this Structure
2C96 is a Single protein structure of sequence from Escherichia coli. 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
Page seeded by OCA on Tue Mar 25 23:56:37 2008
