1xef: Difference between revisions

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[[Image:1xef.gif|left|200px]]
{{Seed}}
[[Image:1xef.png|left|200px]]


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{{STRUCTURE_1xef|  PDB=1xef  |  SCENE=  }}  
{{STRUCTURE_1xef|  PDB=1xef  |  SCENE=  }}  


'''Crystal structure of the ATP/Mg2+ bound composite dimer of HlyB-NBD'''
===Crystal structure of the ATP/Mg2+ bound composite dimer of HlyB-NBD===




==Overview==
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The ABC transporter HlyB is a central element of the HlyA secretion machinery, a paradigm of Type I secretion. Here, we describe the crystal structure of the HlyB-NBD (nucleotide-binding domain) with H662 replaced by Ala in complex with ATP/Mg2+. The dimer shows a composite architecture, in which two intact ATP molecules are bound at the interface of the Walker A motif and the C-loop, provided by the two monomers. ATPase measurements confirm that H662 is essential for activity. Based on these data, we propose a model in which E631 and H662, highly conserved among ABC transporters, form a catalytic dyad. Here, H662 acts as a 'linchpin', holding together all required parts of a complicated network of interactions between ATP, water molecules, Mg2+, and amino acids both in cis and trans, necessary for intermonomer communication. Based on biochemical experiments, we discuss the hypothesis that substrate-assisted catalysis, rather than general base catalysis might operate in ABC-ATPases.
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{{ABSTRACT_PUBMED_15889153}}


==About this Structure==
==About this Structure==
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[[Category: Atpase]]
[[Category: Atpase]]
[[Category: Haemolysin b]]
[[Category: Haemolysin b]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 14:55:20 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:12:22 2008''

Revision as of 02:12, 29 July 2008

File:1xef.png

Template:STRUCTURE 1xef

Crystal structure of the ATP/Mg2+ bound composite dimer of HlyB-NBD

Template:ABSTRACT PUBMED 15889153

About this Structure

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

Reference

H662 is the linchpin of ATP hydrolysis in the nucleotide-binding domain of the ABC transporter HlyB., Zaitseva J, Jenewein S, Jumpertz T, Holland IB, Schmitt L, EMBO J. 2005 Jun 1;24(11):1901-10. Epub 2005 May 12. PMID:15889153

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