4GSP image
Deposition Date 1997-12-02
Release Date 1998-08-12
Last Version Date 2024-10-30
Entry Detail
PDB ID:
4GSP
Keywords:
ENDORIBONUCLEASE
Title:
RIBONUCLEASE T1 COMPLEXED WITH 2',3'-CGPS + 3'-GMP, 7 DAYS
Biological Source:
Source Organism:
Aspergillus oryzae (Taxon ID: 5062)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.65 Å
R-Value Free:
0.19
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
4GSP validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:RIBONUCLEASE T1
Gene (Uniprot):rntA
Chain IDs:A
Chain Length:104
Number of Molecules:1
Biological Source:Aspergillus oryzae
UniProt ID:P00651 Pfam ID:PF00545 EC:4.6.1.24
Ligand Molecules
3GP
CA
SGP
Primary Citation
Hydrolysis of a slow cyclic thiophosphate substrate of RNase T1 analyzed by time-resolved crystallography.
Nat.Struct.Biol. 5 280 283 (1998)
PMID: 9546218 DOI: 10.1038/nsb0498-280

Abstact

Here we present a time-resolved crystallographic analysis of the hydrolysis of exo (Sp) guanosine 2',3'-cyclophosphorothioate by RNase T1. The use of a slow substrate and fast crystallization methods made it possible to perform the study with conventional data-collection techniques. The results support the idea that the hydrolysis reaction proceeds through a mechanism that is the inverse of the transesterification reaction. In addition, the structures provide an explanation for the differential behavior of RNase T1 towards exo- and endo-cyclic thiophosphates.

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Primary Citation of related structures
4GSP