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1xhf

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{{STRUCTURE_1xhf| PDB=1xhf | SCENE= }}
{{STRUCTURE_1xhf| PDB=1xhf | SCENE= }}
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'''Crystal structure of the bef3-activated receiver domain of redox response regulator arca'''
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===Crystal structure of the bef3-activated receiver domain of redox response regulator arca===
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==Overview==
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Escherichia coli react to changes from aerobic to anaerobic conditions of growth using the ArcA-ArcB two-component signal transduction system. This system, in conjunction with other proteins, regulates the respiratory metabolic pathways in the organism. ArcA is a member of the OmpR/PhoB subfamily of response regulator transcription factors that are known to regulate transcription by binding in tandem to target DNA direct repeats. It is still unclear in this subfamily how activation by phosphorylation of the regulatory domain of response regulators stimulates DNA binding by the effector domain and how dimerization and domain orientation, as well as intra- and intermolecular interactions, affect this process. In order to address these questions we have solved the crystal structures of the regulatory domain of ArcA in the presence and absence of the phosphoryl analog, BeF3-. In the crystal structures, the regulatory domain of ArcA forms a symmetric dimer mediated by the alpha4-beta5-alpha5 face of the protein and involving a number of residues that are highly conserved in the OmpR/PhoB subfamily. It is hypothesized that members of this subfamily use a common mechanism of regulation by dimerization. Additional biophysical studies were employed to probe the oligomerization state of ArcA, as well as its individual domains, in solution. The solution studies show the propensity of the individual domains to associate into oligomers larger than the dimer observed for the intact protein, and suggest that the C-terminal DNA-binding domain also plays a role in oligomerization.
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(as it appears on PubMed at http://www.pubmed.gov), where 15876365 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15876365}}
==About this Structure==
==About this Structure==
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[[Category: Transcription factor]]
[[Category: Transcription factor]]
[[Category: Two-component system]]
[[Category: Two-component system]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:02:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 12:39:49 2008''

Revision as of 09:39, 27 July 2008

Image:1xhf.png

Template:STRUCTURE 1xhf

Crystal structure of the bef3-activated receiver domain of redox response regulator arca

Template:ABSTRACT PUBMED 15876365

About this Structure

1XHF is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structural analysis and solution studies of the activated regulatory domain of the response regulator ArcA: a symmetric dimer mediated by the alpha4-beta5-alpha5 face., Toro-Roman A, Mack TR, Stock AM, J Mol Biol. 2005 May 27;349(1):11-26. Epub 2005 Apr 7. PMID:15876365

Page seeded by OCA on Sun Jul 27 12:39:49 2008

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