1x7p: Difference between revisions

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[[Image:1x7p.gif|left|200px]]
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[[Image:1x7p.png|left|200px]]


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{{STRUCTURE_1x7p|  PDB=1x7p  |  SCENE=  }}  
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'''Crystal structure of the SpoU Methyltransferase AviRb from Streptomyces viridochromogenes in complex with the cofactor AdoMet'''
===Crystal structure of the SpoU Methyltransferase AviRb from Streptomyces viridochromogenes in complex with the cofactor AdoMet===




==Overview==
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The emergence of antibiotic-resistant bacterial strains is a widespread problem in medical practice and drug design, and each case requires the elucidation of the underlying mechanism. AviRb from Streptomyces viridochromogenes methylates the 2'-O atom of U2479 of the 23S ribosomal RNA in Gram-positive bacteria and thus mediates resistance to the oligosaccharide (orthosomycin) antibiotic avilamycin. The structure of AviRb with and without bound cofactor S-adenosyl-L-methionine (AdoMet) was determined, showing that it is a homodimer belonging to the SpoU family within the SPOUT class of methyltransferases. The relationships within this class were analyzed in detail and, in addition, a novel fourth SpoU sequence fingerprint is proposed. Each subunit of AviRb consists of two domains. The N-terminal domain, being related to the ribosomal proteins L30 and L7Ae, is likely to bind RNA. The C-terminal domain is related to all SPOUT methyltransferases, and is responsible for AdoMet-binding, catalysis and dimerization. The cofactor binds at the characteristic knot of the polypeptide in an unusually bent conformation. The transferred methyl group points to a broad cleft formed with the L30-type domain of the other subunit. Measurements of mutant activity revealed four important residues responsible for catalysis and allowed the modeling of a complex between AviRb and the RNA target. The model includes a specificity pocket for uracil but does not contain a base for deprotonating the 2'-O atom of U2479 on methylation.
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==About this Structure==
==About this Structure==
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[[Category: C-terminal knot]]
[[Category: C-terminal knot]]
[[Category: Spou]]
[[Category: Spou]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 16:05:10 2008''

Revision as of 13:05, 29 July 2008

File:1x7p.png

Template:STRUCTURE 1x7p

Crystal structure of the SpoU Methyltransferase AviRb from Streptomyces viridochromogenes in complex with the cofactor AdoMet

Template:ABSTRACT PUBMED 15581897

About this Structure

1X7P is a Single protein structure of sequence from Streptomyces viridochromogenes. Full crystallographic information is available from OCA.

Reference

Structure and function of the antibiotic resistance-mediating methyltransferase AviRb from Streptomyces viridochromogenes., Mosbacher TG, Bechthold A, Schulz GE, J Mol Biol. 2005 Jan 21;345(3):535-45. PMID:15581897

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