Yeast DNA polymerases: antigenic relationship, use of RNA primer and associated exonuclease activity.
Highly purified preparation of DNA polymerases A and B from yeast were compared with respect to antigenic relationship, ability to use ribonucleotide primers and associated nuclease activity. The following results were obtained. 1. Antiserum directed against DNA polymerase A inhibits this enzyme but does not interfere with activity of DNA polymerase B or of mitochondrial DNA polymerase, nor does it precipitate the latter two enzymes. 2. DNA polymerase A is capable of using oligo(ribouridylic acid) as a primer for the polymerization of dTMP. This reaction is not catalyzed by polymerase B to any significant extent. 3. Whereas DNA polymerase A is devoid of nuclease activity, DNA polymerase B catalyses an exonucleolytic release of mononucleotide units from the 3' end of polynucleotides. The results of several experiments suggest that this nuclease activity is associated with the DNA polymerase B molecule.
D004259:DNA-Directed DNA Polymerase / Q000276:immunology / Q000378:metabolism*; D000939:Epitopes; D005092:Exonucleases / Q000378:metabolism*; D009841:Oligonucleotides / Q000378:metabolism; D012313:RNA / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D012965:Sodium Chloride / Q000494:pharmacology; D013698:Templates, Genetic
D000939:Epitopes; D009841:Oligonucleotides; D012965:Sodium Chloride; D012313:RNA; D004259:DNA-Directed DNA Polymerase; D005092:Exonucleases