Nucleic Acids Research, Vol 24, Issue 17 3307-3312, Copyright © 1996 by Oxford University Press
T Roldan-Arjona, C Anselmino and T Lindahl
The Escherichia coli endonuclease III (Nth-Eco) protein is involved in the
removal of damaged pyrimidine residues from DNA by base excision repair. It
is an iron-sulphur enzyme possessing both DNA glycosylase and
apurinic/apyrimidinic lyase activities. A database homology search
identified an open reading frame in genomic sequences of
Schizosaccharomyces pombe which encodes a protein highly similar to Nth-
Eco. The gene has been subcloned in an expression vector and the protein
purified to apparent homogeneity. The S.pombe Nth homologue (Nth-Spo) is a
40.2 kDa protein of 355 amino acids. Nth-Spo possesses glycosylase activity
on different types of DNA substrates with pyrimidine damage, being able to
release both urea and thymine glycol from double-stranded polymers. The
eukaryotic protein removes urea more efficiently than the prokaryotic
enzyme, whereas its efficiency in excising thymine glycol is lower. A
nicking assay was used to show that the enzyme also exhibits an AP lyase
activity on UV- and gamma- irradiated DNA substrates. These findings show
that Nth protein is structurally and functionally conserved from bacteria
to fission yeast.
ARTICLES
Molecular cloning and functional analysis of a Schizosaccharomyces pombe homologue of Escherichia coli endonuclease III
Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Hertfordshire, UK.
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