2'-OH of mRNA are critical for the binding of its codons at the 40S ribosomal P site but not at the mRNA entry site.
FEBS Lett 2012;
586:3731-6. [PMID:
22982860 DOI:
10.1016/j.febslet.2012.09.003]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 09/02/2012] [Indexed: 11/20/2022]
Abstract
The roles of 2'-OH groups in the binding of mRNA to human ribosomes were studied using site-directed cross-linking. We found that both mRNA and mDNA analogues bearing a cross-linker can modify ribosomal proteins (rps) S3e and S2e at the mRNA entry site independently on tRNA presence, but only mRNA analogues were capable of a tRNA(Phe)-dependent binding to human ribosomes and cross-linking to rpS26e in the mRNA binding centre. Thus, 2'-OH groups of mRNA are unimportant for binding at the entry site but they are crucial for codon-anticodon interactions at the P site, implying the existence of mRNA-ribosome contacts that do not occur in bacteria.
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