3bk2 | pdb_00003bk2
Crystal Structure Analysis of the RNase J/UMP complex
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| 3bk2, resolution 2.100Å | |||||||||||||
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| Sites: | AC1, AC2, AC3, AC4, AC5, AC6 and AC7 | ||||||||||||
| Ligands: | SO4, ZN, U5P and GOL | ||||||||||||
| Gene: | TTC0775 (Thermus thermophilus) | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Overview
The 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.
About this Structure
3BK2 is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.
Reference
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
Page seeded by OCA on Thu Mar 20 18:59:38 2008
