1MUG image
Entry Detail
PDB ID:
1MUG
Keywords:
HYDROLASE
Title:
G:T/U MISMATCH-SPECIFIC DNA GLYCOSYLASE FROM E.COLI
Biological Source:
Source Organism:
Escherichia coli
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
1998-07-10
Release Date:
1998-07-15
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.80 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
1MUG validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:PROTEIN (G:T/U SPECIFIC DNA GLYCOSYLASE)
Chain IDs:A
Chain Length:168
Number of Molecules:1
Biological Source:Escherichia coli
UniProt ID:P0A9H1 Pfam ID:PF03167 EC:3.2.2.28
Ligand Molecules
SO4
Primary Citation
Crystal structure of a G:T/U mismatch-specific DNA glycosylase: mismatch recognition by complementary-strand interactions.
Cell(Cambridge,Mass.) 92 117 129 (1998)
PMID: 9489705 DOI: 10.1016/S0092-8674(00)80904-6

Abstact

G:U mismatches resulting from deamination of cytosine are the most common promutagenic lesions occurring in DNA. Uracil is removed in a base-excision repair pathway by uracil DNA-glycosylase (UDG), which excises uracil from both single- and double-stranded DNA. Recently, a biochemically distinct family of DNA repair enzymes has been identified, which excises both uracil and thymine, but only from mispairs with guanine. Crystal structures of the mismatch-specific uracil DNA-glycosylase (MUG) from E. coli, and of a DNA complex, reveal a remarkable structural and functional homology to UDGs despite low sequence identity. Details of the MUG structure explain its thymine DNA-glycosylase activity and the specificity for G:U/T mispairs, which derives from direct recognition of guanine on the complementary strand.

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Disease

Primary Citation of related structures
1MUG