1wxx
From Proteopedia
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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''' | ||
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[[Category: Shirouzu, M.]] | [[Category: Shirouzu, M.]] | ||
[[Category: Yokoyama, S.]] | [[Category: Yokoyama, S.]] | ||
| - | [[Category: | + | [[Category: Adomet]] |
| - | [[Category: | + | [[Category: Methyltransferase]] |
| - | [[Category: | + | [[Category: National project on protein structural and functional analyse]] |
| - | [[Category: | + | [[Category: Nppsfa]] |
| - | [[Category: | + | [[Category: Riken structural genomics/proteomics initiative]] |
| - | [[Category: | + | [[Category: Rsgi]] |
| - | [[Category: | + | [[Category: Structural genomic]] |
| - | [[Category: | + | [[Category: Thermus thermophillus]] |
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Revision as of 11:17, 3 May 2008
Crystal structure of Tt1595, a putative SAM-dependent methyltransferase from Thermus thermophillus HB8
Overview
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.
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 Page seeded by OCA on Sat May 3 14:17:16 2008
Categories: Single protein | Thermus thermophilus | Ebihara, A. | Kuramitsu, S. | Murayama, K. | Nakagawa, N. | Pioszak, A A. | RSGI, RIKEN Structural Genomics/Proteomics Initiative. | Shirouzu, M. | Yokoyama, S. | Adomet | Methyltransferase | National project on protein structural and functional analyse | Nppsfa | Riken structural genomics/proteomics initiative | Rsgi | Structural genomic | Thermus thermophillus
