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


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{{STRUCTURE_1wxx|  PDB=1wxx  |  SCENE=  }}  
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'''Crystal structure of Tt1595, a putative SAM-dependent methyltransferase from Thermus thermophillus HB8'''
===Crystal structure of Tt1595, a putative SAM-dependent methyltransferase from Thermus thermophillus HB8===




==Overview==
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The Thermus thermophilus hypothetical protein TTHA1280 belongs to a family of predicted S-adenosyl-L-methionine (AdoMet) dependent RNA methyltransferases (MTases) present in many bacterial and archaeal species. Inspection of amino-acid sequence motifs common to class I Rossmann-fold-like MTases suggested a specific role as an RNA 5-methyluridine MTase. Selenomethionine (SeMet) labelled and native versions of the protein were expressed, purified and crystallized. Two crystal forms of the SeMet-labelled apoprotein were obtained: SeMet-ApoI and SeMet-ApoII. Cocrystallization of the native protein with S-adenosyl-L-homocysteine (AdoHcy) yielded a third crystal form, Native-AdoHcy. The SeMet-ApoI structure was solved by the multiple anomalous dispersion method and refined at 2.55 A resolution. The SeMet-ApoII and Native-AdoHcy structures were solved by molecular replacement and refined at 1.80 and 2.60 A, respectively. TTHA1280 formed a homodimer in the crystals and in solution. Each subunit folds into a three-domain structure composed of a small N-terminal PUA domain, a central alpha/beta-domain and a C-terminal Rossmann-fold-like MTase domain. The three domains form an overall clamp-like shape, with the putative active site facing a deep cleft. The architecture of the active site is consistent with specific recognition of uridine and catalysis of methyl transfer to the 5-carbon position. The cleft is suitable in size and charge distribution for binding single-stranded RNA.
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==About this Structure==
==About this Structure==
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[[Category: Structural genomic]]
[[Category: Structural genomic]]
[[Category: Thermus thermophillus]]
[[Category: Thermus thermophillus]]
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Revision as of 04:44, 28 July 2008

File:1wxx.png

Template:STRUCTURE 1wxx

Crystal structure of Tt1595, a putative SAM-dependent methyltransferase from Thermus thermophillus HB8

Template:ABSTRACT PUBMED 16511182

About this Structure

1WXX is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Structures of a putative RNA 5-methyluridine methyltransferase, Thermus thermophilus TTHA1280, and its complex with S-adenosyl-L-homocysteine., Pioszak AA, Murayama K, Nakagawa N, Ebihara A, Kuramitsu S, Shirouzu M, Yokoyama S, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2005 Oct 1;61(Pt, 10):867-74. Epub 2005 Sep 30. PMID:16511182

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