359d | pdb_0000359d

INHIBITION OF THE HAMMERHEAD RIBOZYME CLEAVAGE REACTION BY SITE-SPECIFIC BINDING OF TB(III)

spinqualitylabelsall models 359d, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 359d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: TB Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Terbium(III) [Tb(III)] was shown to inhibit the hammerhead ribozyme by competing with a single magnesium(II) ion. X-ray crystallography revealed that the Tb(III) ion binds to a site adjacent to an essential guanosine in the catalytic core of the ribozyme, approximately 10 angstroms from the cleavage site. Synthetic modifications near this binding site yielded an RNA substrate that was resistant to Tb(III) binding and capable of being cleaved, even in the presence of up to 20 micromolar Tb(III). It is suggested that the magnesium(II) ion thought to bind at this site may act as a switch, affecting the conformational changes required to achieve the transition state. Inhibition of the hammerhead ribozyme cleavage reaction by site-specific binding of Tb.,Feig AL, Scott WG, Uhlenbeck OC Science. 1998 Jan 2;279(5347):81-4. PMID:9417029 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribozyme

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