1m74

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{{STRUCTURE_1m74| PDB=1m74 | SCENE= }}
{{STRUCTURE_1m74| PDB=1m74 | SCENE= }}
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'''Crystal structure of Mg-ADP-bound SecA from Bacillus subtilis'''
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===Crystal structure of Mg-ADP-bound SecA from Bacillus subtilis===
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==Overview==
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The SecA adenosine triphosphatase (ATPase) mediates extrusion of the amino termini of secreted proteins from the eubacterial cytosol based on cycles of reversible binding to the SecYEG translocon. We have determined the crystal structure of SecA with and without magnesium-adenosine diphosphate bound to the high-affinity ATPase site at 3.0 and 2.7 angstrom resolution, respectively. Candidate sites for preprotein binding are located on a surface containing the SecA epitopes exposed to the periplasm upon binding to SecYEG and are thus positioned to deliver preprotein to SecYEG. Comparisons with structurally related ATPases, including superfamily I and II ATP-dependent helicases, suggest that the interaction geometry of the tandem motor domains in SecA is modulated by nucleotide binding, which is shown by fluorescence anisotropy experiments to reverse an endothermic domain-dissociation reaction hypothesized to gate binding to SecYEG.
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(as it appears on PubMed at http://www.pubmed.gov), where 12242434 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12242434}}
==About this Structure==
==About this Structure==
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[[Category: Protein translocation]]
[[Category: Protein translocation]]
[[Category: Transmembrane transport]]
[[Category: Transmembrane transport]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:43:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 23:21:32 2008''

Revision as of 20:21, 2 July 2008

Image:1m74.png

Template:STRUCTURE 1m74

Crystal structure of Mg-ADP-bound SecA from Bacillus subtilis

Template:ABSTRACT PUBMED 12242434

About this Structure

1M74 is a Single protein structure of sequence from Bacillus subtilis. Full crystallographic information is available from OCA.

Reference

Nucleotide control of interdomain interactions in the conformational reaction cycle of SecA., Hunt JF, Weinkauf S, Henry L, Fak JJ, McNicholas P, Oliver DB, Deisenhofer J, Science. 2002 Sep 20;297(5589):2018-26. PMID:12242434

Page seeded by OCA on Wed Jul 2 23:21:32 2008

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