2h0x
Pre-cleavage state of the Thermoanaerobacter tengcongensis glmS ribozyme
OverviewOverview
The glmS ribozyme is the only natural catalytic RNA known to require a small-molecule activator for catalysis. This catalytic RNA functions as a riboswitch, with activator-dependent RNA cleavage regulating glmS messenger RNA expression. We report crystal structures of the glmS ribozyme in precleavage states that are unliganded or bound to the competitive inhibitor glucose-6-phosphate and in the postcleavage state. All structures superimpose closely, revealing a remarkably rigid RNA that contains a preformed active and coenzyme-binding site. Unlike other riboswitches, the glmS ribozyme binds its activator in an open, solvent-accessible pocket. Our structures suggest that the amine group of the glmS ribozyme-bound coenzyme performs general acid-base and electrostatic catalysis.
About this StructureAbout this Structure
2H0X is a Single protein structure. Full crystallographic information is available from OCA.
ReferenceReference
Structural basis of glmS ribozyme activation by glucosamine-6-phosphate., Klein DJ, Ferre-D'Amare AR, Science. 2006 Sep 22;313(5794):1752-6. PMID:16990543 Page seeded by OCA on Sun May 4 05:44:18 2008