435d
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(New page: 200px<br /><applet load="435d" size="350" color="white" frame="true" align="right" spinBox="true" caption="435d, resolution 1.40Å" /> '''5'-R(*UP*AP*GP*CP*CP...)
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Revision as of 19:43, 29 January 2008
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5'-R(*UP*AP*GP*CP*CP*CP*C)-3', 5'-R(*GP*GP*GP*GP*CP*UP*A)-3'
Overview
The acceptor stem of Escherichia coli tRNA(Ala), rGGGGCUA.rUAGCUCC, (ALAwt), contains the main identity element for the correct aminoacylation, by the alanyl tRNA synthetase. The presence of a G3.U70 wobble base pair, is essential for the specificity of this reaction, but there is a debate, whether direct minor-groove contact with the 2-amino group of G3 or a, distortion of the acceptor stem induced by the wobble pair is the critical, feature recognized by the synthetase. We here report the structure, analysis of ALAwt at near-atomic resolution using twinned crystals. The, crystal lattice is stabilized by a novel strontium binding motif between, two cis-diolic O3'-terminal riboses. The two independent molecules in the, asymmetric unit of the crystal show overall A-RNA geometry. A comparison, with the crystal structure of the G3-C70 mutant of the acceptor stem, (ALA(C70)) determined at 1.4 A exhibits a modulation in ALAwt of helical, twist and slide due to the wobble base pair, but no recognizable, distortion of the helix fragment distant from the wobble base pair. We, suggest that a highly conserved hydration pattern in both grooves around, the G3.U70 wobble base pair may be functionally significant.
About this Structure
435D is a Protein complex structure of sequences from [1] with as ligand. Full crystallographic information is available from OCA.
Reference
Crystal structure of acceptor stem of tRNA(Ala) from Escherichia coli shows unique G.U wobble base pair at 1.16 A resolution., Mueller U, Schubel H, Sprinzl M, Heinemann U, RNA. 1999 May;5(5):670-7. PMID:10334337
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