1ojl

CRYSTAL STRUCTURE OF A SIGMA54-ACTIVATOR SUGGESTS THE MECHANISM FOR THE CONFORMATIONAL SWITCH NECESSARY FOR SIGMA54 BINDING

spinqualitylabelsall models 1ojl, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ojl is a 6 chain structure with sequence from Salmonella enterica subsp. enterica serovar typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ATP, PO4 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The sigma(54)-dependent transcription in bacteria is associated with various stress and growth conditions. Activators of the sigma(54) protein contain a central domain belonging to the AAA+ superfamily of ATPases, members of which function in diverse cellular processes in both prokaryotic and eukaryotic cells. We describe the X-ray structure of an N-terminal domain deletion of the ZraR protein from Salmonella typhimurium, which is a homologue of the general nitrogen regulatory protein NtrC, at 3A resolution. The structure reveals a hexameric ring that is typical for AAA+ containing proteins but which differs from the heptameric ring found in the crystal structure of the AAA+ domain of NtrC1 from Aquifex aeolicus. The dimerisation interface between DNA-binding domains observed in the crystal structure suggests that dodecamers, rather than hexamers, might be the functionally important oligomer. Crystal structure of the central and C-terminal domain of the sigma(54)-activator ZraR.,Sallai L, Tucker PA J Struct Biol. 2005 Aug;151(2):160-70. PMID:16005641 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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