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The Structure of a Ribosomal Protein S8/spc Operon mRNA ComplexThe Structure of a Ribosomal Protein S8/spc Operon mRNA Complex
Structural highlights
FunctionRS8_ECOLI One of the primary rRNA binding proteins, it binds directly to 16S rRNA central domain where it helps coordinate assembly of the platform of the 30S subunit (By similarity).[HAMAP-Rule:MF_01302_B] Protein S8 is a translational repressor protein, it controls the translation of the spc operon by binding to its mRNA.[HAMAP-Rule:MF_01302_B] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedIn bacteria, translation of all the ribosomal protein cistrons in the spc operon mRNA is repressed by the binding of the product of one of them, S8, to an internal sequence at the 5' end of the L5 cistron. The way in which the first two genes of the spc operon are regulated, retroregulation, is mechanistically distinct from translational repression by S8 of the genes from L5 onward. A 2.8 A resolution crystal structure has been obtained of Escherichia coli S8 bound to this site. Despite sequence differences, the structure of this complex is almost identical to that of the S8/helix 21 complex seen in the small ribosomal subunit, consistent with the hypothesis that autogenous regulation of ribosomal protein synthesis results from conformational similarities between mRNAs and rRNAs. S8 binding must repress the translation of its own mRNA by inhibiting the formation of a ribosomal initiation complex at the start of the L5 cistron. The structure of a ribosomal protein S8/spc operon mRNA complex.,Merianos HJ, Wang J, Moore PB RNA. 2004 Jun;10(6):954-64. PMID:15146079[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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