title: Characterization of a new DNA polymerase from Schizosaccharomyces pombe: a probable homologue of the Saccharomyces cerevisiae DNA polymerase gamma.
abstract: Mitochondrial (mt) DNA replication is carried out by the nuclear-encoded DNA polymerase-gamma (Pol-gamma). We have cloned a new DNA polymerase-encoding gene from Schizosaccharomyces pombe (Sp), which we believe encodes the homologue of the Saccharomyces cerevisiae (Sc) mt DNA polymerase (MIP1). The putative Sp pol gamma gene expressed a transcript of approx. 4-kb that contained a 3-kb open reading frame encoding a polypeptide of 1018 amino acids (aa) (116 kDa). This Sp Pol-gamma is 48% identical to the Sc MIP1 and contains uniquely conserved regions not found in the bacterial PolI-type DNA polymerases. The most notable difference between these two proteins is that the MIP1 product has a 236-aa C-terminal region beyond motif C that is not found in Sp Pol-gamma. Chromosomal mapping and genomic sequencing of the Sp pol gamma places this gene on chromosome III downstream from the triose phosphate isomerase-encoding gene.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004258:DNA Polymerase III / Q000235:genetics; D004259:DNA-Directed DNA Polymerase / Q000235:genetics* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D012568:Schizosaccharomyces / Q000201:enzymology*; D012689:Sequence Homology, Nucleic Acid
chemical_list: D004258:DNA Polymerase III; D004259:DNA-Directed DNA Polymerase