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. 1993 Nov 25;21(23):5301–5307. doi: 10.1093/nar/21.23.5301

Yeast open reading frame YCR14C encodes a DNA beta-polymerase-like enzyme.

R Prasad 1, S G Widen 1, R K Singhal 1, J Watkins 1, L Prakash 1, S H Wilson 1
PMCID: PMC310562  PMID: 8265341

Abstract

We have shown by activity gel that overexpression in E. coli of a yeast chromosome 3 open reading frame (ORF) designated YCR14C and bearing homology to mammalian DNA polymerases beta results in a new DNA polymerase in the host cells. The molecular mass of this enzyme corresponded to the YCR14C-predicted 67 kDa protein, and NH2-terminal amino acid sequencing confirmed that the expressed protein was encoded by the yeast ORF. This new yeast DNA polymerase was purified to homogeneity from E.coli. In a fashion similar to that of mammalian beta-polymerases, the purified yeast enzyme exhibited distributive DNA synthesis on DNA substrate with a single-stranded template and processive gap-filling synthesis on a short-gapped DNA substrate. Activity of this yeast beta-polymerase-like enzyme was sensitive to the beta-polymerase inhibitor ddNTP and resistant to both 1 mM NEM and neutralizing antibody to E. coli DNA polymerase I. These results, therefore, indicate that YCR14C encodes a DNA beta-polymerase-like enzyme in yeast, and we name it DNA polymerase IV. Yeast strains harboring a deletion mutation of the pol IV gene are viable, they exhibit no increase in sensitivity to ultraviolet light, ionizing radiation or alkylating agents, and sporulation and spore viability are not affected in the mutant.

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