3bk2 | pdb_00003bk2
Crystal Structure Analysis of the RNase J/UMP complex
Structural highlights
FunctionRNJ_THET2 An RNase that has endonuclease and possibly 5'-3' exonuclease activity. Probably involved in maturation of rRNA and in some organisms also mRNA maturation and/or decay.[1] 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 PubMedThe maturation and stability of RNA transcripts is controlled by a combination of endo- and exoRNases. RNase J is unique, as it combines an RNase E-like endoribonucleolytic and a 5'-to-3' exoribonucleolytic activity in a single polypeptide. The structural basis for this dual activity is unknown. Here we report the crystal structures of Thermus thermophilus RNase J and its complex with uridine 5'-monophosphate. A binding pocket coordinating the phosphate and base moieties of the nucleotide in the vicinity of the catalytic center provide a rationale for the 5'-monophosphate-dependent 5'-to-3' exoribonucleolytic activity. We show that this dependence is strict; an initial 5'-PPP transcript cannot be degraded exonucleolytically from the 5'-end. Our results suggest that RNase J might switch promptly from endo- to exonucleolytic mode on the same RNA, a property that has important implications for RNA metabolism in numerous prokaryotic organisms and plant organelles containing RNase J orthologs. Structural insights into the dual activity of RNase J.,de la Sierra-Gallay IL, Zig L, Jamalli A, Putzer H Nat Struct Mol Biol. 2008 Feb;15(2):206-12. Epub 2008 Jan 20. PMID:18204464[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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