1UVK image
Deposition Date 2004-01-21
Release Date 2004-02-19
Last Version Date 2023-12-13
Entry Detail
PDB ID:
1UVK
Keywords:
Title:
The structural basis for RNA specificity and Ca2 inhibition of an RNA-dependent RNA polymerase phi6p2 dead-end complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.45 Å
R-Value Free:
0.26
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:RNA-directed RNA polymerase
Gene (Uniprot):P2
Chain IDs:A, B (auth: C), C (auth: E)
Chain Length:664
Number of Molecules:3
Biological Source:Pseudomonas phage phi6
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
GTP I G GUANOSINE-5'-TRIPHOSPHATE
Primary Citation
The structural basis for RNA specificity and Ca2+ inhibition of an RNA-dependent RNA polymerase.
Structure 12 307 316 (2004)
PMID: 14962391 DOI: 10.1016/j.str.2004.01.012

Abstact

The RNA-dependent RNA polymerase of bacteriophage phi6 transcribes mRNA from the three segments of the dsRNA viral genome. We have cocrystallized RNA oligonucleotides with the polymerase, revealing the mode of binding of RNA templates. This binding is somewhat different from that previously seen for DNA oligomers, leading to additional RNA-protein hydrogen bonds, consistent with a preference for RNA. Activation of the RNA/polymerase complex by the addition of substrate and Mg2+ initiates a single round of reaction within the crystal to form a dead-end complex that partially collapses within the enzyme active site. By replacing Mg2+ with Ca2+, we have been able to capture the inhibited complex which shows distortion that explains the structural basis for the inhibition of such polymerases by Ca2+.

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Primary Citation of related structures