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'''Solution Structure of the C-terminal RpoN Domain of Sigma-54 from Aquifex aeolicus''' | '''Solution Structure of the C-terminal RpoN Domain of Sigma-54 from Aquifex aeolicus''' | ||
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[[Category: Pelton, J G.]] | [[Category: Pelton, J G.]] | ||
[[Category: Wemmer, D E.]] | [[Category: Wemmer, D E.]] | ||
[[Category: | [[Category: Rna polymerase]] | ||
[[Category: | [[Category: Sigma-54,sigma factor]] | ||
[[Category: | [[Category: Solution structure]] | ||
[[Category: | [[Category: Transcription]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:03:48 2008'' | |||
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Revision as of 16:03, 3 May 2008
Solution Structure of the C-terminal RpoN Domain of Sigma-54 from Aquifex aeolicus
Overview
The "sigma" subunit of prokaryotic RNA polymerase allows gene-specific transcription initiation. Two sigma families have been identified, sigma70 and sigma54, which use distinct mechanisms to initiate transcription and share no detectable sequence homology. Although the sigma70-type factors have been well characterized structurally by x-ray crystallography, no high resolution structural information is available for the sigma54-type factors. Here we present the NMR-derived structure of the C-terminal domain of sigma54 from Aquifex aeolicus. This domain (Thr-323 to Gly-389), which contains the highly conserved RpoN box sequence, consists of a poorly structured N-terminal tail followed by a three-helix bundle, which is surprisingly similar to domains of the sigma70-type proteins. Residues of the RpoN box, which have previously been shown to be critical for DNA binding, form the second helix of an unpredicted helix-turn-helix motif. The homology of this structure with other DNA-binding proteins, combined with previous biochemical data, suggests how the C-terminal domain of sigma54 binds to DNA.
About this Structure
2AHQ is a Single protein structure of sequence from Aquifex aeolicus. Full crystallographic information is available from OCA.
Reference
The C-terminal RpoN domain of sigma54 forms an unpredicted helix-turn-helix motif similar to domains of sigma70., Doucleff M, Malak LT, Pelton JG, Wemmer DE, J Biol Chem. 2005 Dec 16;280(50):41530-6. Epub 2005 Oct 6. PMID:16210314 Page seeded by OCA on Sat May 3 19:03:48 2008
