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1sx1

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{{STRUCTURE_1sx1| PDB=1sx1 | SCENE= }}
{{STRUCTURE_1sx1| PDB=1sx1 | SCENE= }}
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'''Solution NMR Structure and X-ray Absorption Analysis of the C-Terminal Zinc-Binding Domain of the SecA ATPase'''
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===Solution NMR Structure and X-ray Absorption Analysis of the C-Terminal Zinc-Binding Domain of the SecA ATPase===
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==Overview==
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The solution NMR structure of a 22-residue Zn(2+)-binding domain (ZBD) from Esherichia coli preprotein translocase subunit SecA is presented. In conjunction with X-ray absorption analysis, the NMR structure shows that three cysteines and a histidine in the sequence CXCXSGX(8)CH assume a tetrahedral arrangement around the Zn(2+) atom, with an average Zn(2+)-S bond distance of 2.30 A and a Zn(2+)-N bond distance of 2.03 A. The NMR structure shows that ND1 of His20 binds to the Zn(2+) atom. The ND1-Zn(2+) bond is somewhat strained: it makes an angle of approximately 17 degrees with the plane of the ring, and it also shows a significant "in-plane" distortion of 13 degrees. A comprehensive sequence alignment of the SecA-ZBD from many different organisms shows that, along with the four Zn(2+) ligands, there is a serine residue (Ser12) that is completely conserved. The NMR structure indicates that the side chain of this serine residue forms a strong hydrogen bond with the thiolate of the third cysteine residue (Cys19); therefore, the conserved serine appears to have a critical role in the structure. SecB, an export-specific chaperone, is the only known binding partner for the SecA-ZBD. A phylogenetic analysis using 86 microbial genomes shows that 59 of the organisms carry SecA with a ZBD, but only 31 of these organisms also possess a gene for SecB, indicating that there may be uncharacterized binding partners for the SecA-ZBD.
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(as it appears on PubMed at http://www.pubmed.gov), where 15260479 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15260479}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SX1 OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SX1 OCA].
==Reference==
==Reference==
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[[Category: Tetrahedral coordination]]
[[Category: Tetrahedral coordination]]
[[Category: Zinc]]
[[Category: Zinc]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:14:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:30:55 2008''

Revision as of 14:31, 27 July 2008

Image:1sx1.png

Template:STRUCTURE 1sx1

Solution NMR Structure and X-ray Absorption Analysis of the C-Terminal Zinc-Binding Domain of the SecA ATPase

Template:ABSTRACT PUBMED 15260479

About this Structure

Full experimental information is available from OCA.

Reference

Solution NMR structure and X-ray absorption analysis of the C-terminal zinc-binding domain of the SecA ATPase., Dempsey BR, Wrona M, Moulin JM, Gloor GB, Jalilehvand F, Lajoie G, Shaw GS, Shilton BH, Biochemistry. 2004 Jul 27;43(29):9361-71. PMID:15260479

Page seeded by OCA on Sun Jul 27 17:30:55 2008

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