2C96

Structural basis of the nucleotide driven conformational changes in the AAA domain of transcription activator PspF

Summary for 2C96

• Entry DOI: 10.2210/pdb2c96/pdb
• Related: 2BJV 2BJW 2C98 2C99 2C9C
• Descriptor: PSP OPERON TRANSCRIPTIONAL ACTIVATOR, ADENOSINE-5'-TRIPHOSPHATE (3 entities in total)
• Functional Keywords: bacterial sigma54 activator, atpase, aaa domain, activator, atp-binding, dna-binding, nucleotide-binding, sensory transduction, transcription regulation, two-component regulatory system
• Biological source: ESCHERICHIA COLI
• Cellular location: Cytoplasm (Potential): P37344
• Total number of polymer chains: 1
• Total formula weight: 30494.48

Authors

Rappas, M.,Schumacher, J.,Niwa, H.,Buck, M.,Zhang, X. (deposition date: 2005-12-09, release date: 2006-02-01, Last modification date: 2023-12-13)

Primary citation

Rappas, M.,Schumacher, J.,Niwa, H.,Buck, M.,Zhang, X.
Structural Basis of the Nucleotide Driven Conformational Changes in the Aaa(+) Domain of Transcription Activator Pspf.
J.Mol.Biol., 357:481-, 2006

PubMed Abstract: 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.

PubMed: 16430918
DOI: 10.1016/J.JMB.2005.12.052

Experimental method

X-RAY DIFFRACTION (1.8 Å)