Journal of Experimental Botany, Vol. 51, No. 352, pp. 1945-1947,
November 1, 2000
© 2000 Oxford University Press
Short Communication |
A novel DNA-binding protein associated with DNA polymerase-
in pea stimulates polymerase activity on infrequently primed templates
1 School of Biological Sciences, University of Exeter, Exeter EX4 4QG, UK
2 Department of Biological Sciences, University of Illinois, Chicago, IL 60607-7060, USA
Abstract
A 42 kDa DNA-binding protein is associated with DNA polymerase-
-primase in pea (Pisum sativum). In a previous publication it was shown that the protein has strong preference for dsss junctions in DNA, including the cohesive termini generated by restriction endonucleases. In this paper it is shown that when the DNA-binding protein is added back to polymerase-primase, the protein stimulates the activity of the polymerase. The stimulation is particularly marked when M13 DNA, primed with a single sequencing primer or primed with oligoribonucleotides by the polymerase's associated primase activity, is used as a template. The stimulation of polymerase activity is not caused by an increase in processivity. These data lead to the suggestion that the 42 kDa DNA-binding protein is a primer-recognition protein.
Key words: DNA-binding protein, DNA polymerase, pea, Pisum sativum, primer, primer-recognition protein.
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