1D6A image
Deposition Date 1999-10-12
Release Date 1999-12-16
Last Version Date 2024-11-20
Entry Detail
PDB ID:
1D6A
Keywords:
Title:
STRUCTURE OF POKEWEED ANTIVIRAL PROTEIN COMPLEXED WITH GUANINE
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:POKEWEED ANTIVIRAL PROTEIN
Gene (Uniprot):PAP1
Chain IDs:A, B
Chain Length:262
Number of Molecules:2
Biological Source:Phytolacca americana
Ligand Molecules
Primary Citation
X-ray crystallographic analysis of the structural basis for the interaction of pokeweed antiviral protein with guanine residues of ribosomal RNA.
Protein Sci. 8 2399 2405 (1999)
PMID: 10595542

Abstact

Pokeweed antiviral protein (PAP) is a ribosome-inactivating protein (RIP), which enzymatically removes a single adenine base from a conserved, surface exposed loop sequence of ribosomal rRNA. We now present unprecedented experimental evidence that PAP can release not only adenine but guanine as well from Escherichia coli rRNA, albeit at a rate 20 times slower than for adenine. We also report X-ray structure analysis and supporting modeling studies for the interactions of PAP with guanine. Our modeling studies indicated that PAP can accommodate a guanine base in the active site pocket without large conformational changes. This prediction was experimentally confirmed, since a guanine base was visible in the active site pocket of the crystal structure of the PAP-guanine complex.

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Primary Citation of related structures