4kzz
From Proteopedia
Rabbit 40S ribosomal subunit in complex with mRNA, initiator tRNA and eIF1A
Structural highlights
FunctionIF1AX_HUMAN Seems to be required for maximal rate of protein biosynthesis. Enhances ribosome dissociation into subunits and stabilizes the binding of the initiator Met-tRNA(I) to 40 S ribosomal subunits. Publication Abstract from PubMedDuring translation initiation in eukaryotes, the small ribosomal subunit binds messenger RNA at the 5' end and scans in the 5' to 3' direction to locate the initiation codon, form the 80S initiation complex and start protein synthesis. This simple, yet intricate, process is guided by multiple initiation factors. Here we determine the structures of three complexes of the small ribosomal subunit that represent distinct steps in mammalian translation initiation. These structures reveal the locations of eIF1, eIF1A, mRNA and initiator transfer RNA bound to the small ribosomal subunit and provide insights into the details of translation initiation specific to eukaryotes. Conformational changes associated with the captured functional states reveal the dynamics of the interactions in the P site of the ribosome. These results have functional implications for the mechanism of mRNA scanning. The initiation of mammalian protein synthesis and mRNA scanning mechanism.,Lomakin IB, Steitz TA Nature. 2013 Jul 21. doi: 10.1038/nature12355. PMID:23873042[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. Loading citation details.. Citations No citations found See Also
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