1wts
From Proteopedia
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HELIX 45 (16S RRNA) FROM B. STEAROTHERMOPHILUS, NMR, MINIMIZED AVERAGE STRUCTURE
Overview
BACKGROUND: Ribosomal RNAs contain many modified nucleotides. The, functions of these nucleotides are poorly understood and few of them are, strongly conserved. The final stem loop in 16S-like rRNAs is an exception, in both regards. In both prokaryotes and eukaryotes, the tetranucleotide, loop that caps the 3'-terminal stem contains two N6, N6-dimethyladenosine, residues. The sequence and pattern of methylation are conserved within the, loop, and there is evidence that these methylated nucleotides play an, important role in subunit association and the initiation of protein, synthesis. Because of the integral role that helix 45 plays in ribosome, function, it is important to know what consequences these methylated, nucleotides have on its structure. RESULTS: We have solved the solution, structure of a 14-nucleotide analog of the terminal stem loop of bacterial, 16S rRNA, which contains N2-methylguanosine as well as two, N6,N6-dimethyladenosines. CONCLUSIONS: The methylation of the 16S rRNA, stem loop completely alters its conformation, which would otherwise be a, GNRA tetraloop. It is likely that the conformation of this loop is crucial, for its function, having implications for its interaction with ribosomal, subunits and its role in the initiation of protein synthesis.
About this Structure
1WTS is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
The structure of a methylated tetraloop in 16S ribosomal RNA., Rife JP, Moore PB, Structure. 1998 Jun 15;6(6):747-56. PMID:9655826
Page seeded by OCA on Sun Nov 25 00:42:03 2007
