1xpr

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{{STRUCTURE_1xpr| PDB=1xpr | SCENE= }}
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'''Structural mechanism of inhibition of the Rho transcription termination factor by the antibiotic 5a-formylbicyclomycin (FB)'''
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===Structural mechanism of inhibition of the Rho transcription termination factor by the antibiotic 5a-formylbicyclomycin (FB)===
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==Overview==
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Rho is a hexameric RNA/DNA helicase/translocase that terminates transcription of select genes in bacteria. The naturally occurring antibiotic, bicyclomycin (BCM), acts as a noncompetitive inhibitor of ATP turnover to disrupt this process. We have determined three independent X-ray crystal structures of Rho complexed with BCM and two semisynthetic derivatives, 5a-(3-formylphenylsulfanyl)-dihydrobicyclomycin (FPDB) and 5a-formylbicyclomycin (FB) to 3.15, 3.05, and 3.15 A resolution, respectively. The structures show that BCM and its derivatives are nonnucleotide inhibitors that interact with Rho at a pocket adjacent to the ATP and RNA binding sites in the C-terminal half of the protein. BCM association prevents ATP turnover by an unexpected mechanism, occluding the binding of the nucleophilic water molecule required for ATP hydrolysis. Our data explain why only certain elements of BCM have been amenable to modification and serve as a template for the design of new inhibitors.
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(as it appears on PubMed at http://www.pubmed.gov), where 15642265 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15642265}}
==About this Structure==
==About this Structure==
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[[Category: Fb]]
[[Category: Fb]]
[[Category: Rho]]
[[Category: Rho]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:20:38 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 00:45:56 2008''

Revision as of 21:45, 28 July 2008

Image:1xpr.png

Template:STRUCTURE 1xpr

Structural mechanism of inhibition of the Rho transcription termination factor by the antibiotic 5a-formylbicyclomycin (FB)

Template:ABSTRACT PUBMED 15642265

About this Structure

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

Reference

Structural mechanism of inhibition of the Rho transcription termination factor by the antibiotic bicyclomycin., Skordalakes E, Brogan AP, Park BS, Kohn H, Berger JM, Structure. 2005 Jan;13(1):99-109. PMID:15642265

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