title: A DNA primase that copurifies with the major DNA polymerase from the yeast Saccharomyces cerevisiae.
abstract: Biochemical fractionation of the yeast Saccharomyces cerevisiae has revealed a novel DNA primase activity that copurifies with the major DNA polymerase activity. In the presence of RNA precursors and single-stranded DNA (poly(dT), M13), the DNA primase synthesizes discrete length oligoribonucleotides (apparent length, 8-12 nucleotides) as well as longer RNA chains that appear to be multiples of a modal length of 11-12 nucleotides. When DNA precursors are also present, the oligoribonucleotides are utilized by the accompanying DNA polymerase as primers for DNA synthesis. Copurification of these two enzymatic activities suggests their association in a physical complex which may function in the synthesis of Okazaki fragments at chromosomal replication forks.
mesh_terms: D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D019915:DNA Primase; D004277:DNA, Single-Stranded / Q000378:metabolism; D004259:DNA-Directed DNA Polymerase / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D012316:RNA Nucleotidyltransferases / Q000302:isolation & purification*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*
chemical_list: D004277:DNA, Single-Stranded; D019915:DNA Primase; D012316:RNA Nucleotidyltransferases; D004259:DNA-Directed DNA Polymerase