4kzz | pdb_00004kzz
Rabbit 40S ribosomal subunit in complex with mRNA, initiator tRNA and eIF1A
Structural highlights
FunctionG1TGI6_RABIT Required for the assembly and/or stability of the 40S ribosomal subunit. Required for the processing of the 20S rRNA-precursor to mature 18S rRNA in a late step of the maturation of 40S ribosomal subunits. Also functions as a cell surface receptor for laminin. Plays a role in cell adhesion to the basement membrane and in the consequent activation of signaling transduction pathways. May play a role in cell fate determination and tissue morphogenesis. Also acts as a receptor for several other ligands, including the pathogenic prion protein, viruses, and bacteria. Acts as a PPP1R16B-dependent substrate of PPP1CA.[HAMAP-Rule:MF_03016] 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. See Also
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