ISDA

Deposition Date 1997-10-27

Release Date 1997-11-07

Last Version Date 2023-08-02

Entry Detail

PDB ID:

359D

Keywords:

RIBOZYME

Title:

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

Biological Source:

Source Organism:

(Taxon ID: ) (Taxon ID: )

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.90 Å

R-Value Free:

0.30

R-Value Work:

0.25

R-Value Observed:

0.25

Space Group:

P 31 2 1

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Macromolecular Entities

Polymer Type:polyribonucleotide
Molecule:RNA HAMMERHEAD RIBOZYME
Chain IDs:A
Chain Length:16
Number of Molecules:1
Biological Source:

Polymer Type:polyribonucleotide
Molecule:RNA HAMMERHEAD RIBOZYME
Chain IDs:B
Chain Length:25
Number of Molecules:1
Biological Source:

Ligand Molecules

Primary Citation

Inhibition of the hammerhead ribozyme cleavage reaction by site-specific binding of Tb.

Feig, A.L, Scott, W.G, Uhlenbeck, O.C, Scott, W.G, Murray, J.B, Arnold, J.R.P, Stoddard, B.L, Klug, A.Show

Science 279 81 84 (1998)

PMID: 9417029 DOI: 10.1126/science.279.5347.81

Abstact

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.

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Primary Citation of related structures