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© Research
Publication : Molecular & general genetics : MGG

In vivo species specificity of DNA polymerase alpha

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular & general genetics : MGG - 01 Nov 1993

Francesconi S, Copeland WC, Wang TS

Link to Pubmed [PMID] – 8246900

Mol. Gen. Genet. 1993 Nov;241(3-4):457-66

The DNA polymerase alpha enzymes from human, and budding (Saccharomyces cerevisiae) and fission yeast (Schizosaccharomyces pombe) are homologous proteins involved in initiation and replication of chromosomal DNA. Sequence comparison of human DNA polymerase alpha with that of S. cerevisiae and S. pombe shows overall levels of amino acid sequence identity of 32% and 34%, respectively. We report here that, despite the sequence conservation among these three enzymes, functionally active human DNA polymerase alpha fails to rescue several different conditional lethal alleles of the budding yeast POL1 gene at nonpermissive temperature. Furthermore, human DNA polymerase alpha cannot complement a null allele of budding yeast POL1 either in germinating spores or in vegetatively growing cells. In fission yeast, functionally active human DNA polymerase alpha is also unable to complement the disrupted pol alpha::ura4+ allele in germinating spores. Thus, in vivo, DNA polymerase alpha has stringent species specificity for initiation and replication of chromosomal DNA.

http://www.ncbi.nlm.nih.gov/pubmed/8246900