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Nucleic Acids Research, Vol 24, Issue 8 1481-1488, Copyright © 1996 by Oxford University Press

ARTICLES

The gamma subfamily of DNA polymerases: cloning of a developmentally regulated cDNA encoding Xenopus laevis mitochondrial DNA polymerase gamma

F Ye, JA Carrodeguas and DF Bogenhagen
Department of Pharmacological Sciences, State University of New York at Stony Brook 11794-8651, USA.

We used the known sequence of the Saccharomyces cerevisiae DNA polymerase gamma to clone the genes or cDNAs encoding this enzyme in two other yeasts, Pychia pastoris and Schizosaccharomyces pombe, and one higher eukaryote, Xenopus laevis. To confirm the identity of the final X.laevis clone, two antisera raised against peptide sequences were shown to react with DNA polymerase gamma purified from X.laevis oocyte mitochondria. A developmentally regulated 4.6 kb mRNA is recognized on Northern blots of oocyte RNA using the X.laevis cDNA. Comparison of the four DNA polymerase gamma gene sequences revealed several highly conserved sequence blocks, comprising an N-terminal 3'-- >5'exonuclease domain and a C-terminal polymerase active center interspersed with gamma-specific gene sequences. The consensus sequences for the DNA polymerase gamma exonuclease and polymerase domains show extensive sequence similarity to DNA polymerase I from Escherichia coli. Sequence conservation is greatest for residues located near the active centers of the exo and pol domains of the E.coli DNA polymerase I structure. The domain separating the exonuclease and polymerase active sites is larger in DNA polymerase gamma than in other members of family A (DNA polymerase I-like) polymerases. The S.cerevisiae DNA polymerase gamma is atypical in that it includes a 240 residue C-terminal extension that is not found in the other members of the DNA polymerase gamma family, or in other family A DNA polymerases.
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