1sb7
| |||||||
| , resolution 2.20Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Gene: | TRUD, B2745 (Escherichia coli) | ||||||
| Activity: | Pseudouridylate synthase, with EC number 4.2.1.70 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of the E.coli pseudouridine synthase TruD
OverviewOverview
The pseudouridine (Psi) synthases Pus7p and TruD define a family of RNA-modifying enzymes with no sequence similarity to previously characterized Psi synthases. The 2.2 A resolution structure of Escherichia coli TruD reveals a U-shaped molecule with a catalytic domain that superimposes closely on that of other Psi synthases. A domain that appears to be unique to TruD/Pus7p family enzymes hinges over the catalytic domain, possibly serving to clasp the substrate RNAs. The active site comprises residues that are conserved in other Psi synthases, although at least one comes from a structurally distinct part of the protein. Remarkably, the connectivity of the structural elements of the TruD catalytic domain is a circular permutation of that of its paralogs. Because the sequence of the permuted segment, a beta-strand that bisects the catalytic domain, is conserved among orthologs from bacteria, archaea and eukarya, the permutation likely happened early in evolution.
About this StructureAbout this Structure
1SB7 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of the highly divergent pseudouridine synthase TruD reveals a circular permutation of a conserved fold., Hoang C, Ferre-D'Amare AR, RNA. 2004 Jul;10(7):1026-33. PMID:15208439
Page seeded by OCA on Thu Mar 20 14:02:43 2008