Shioda M, Murakami-Murofushi K. Selective inhibition of DNA polymerase alpha by a polysaccharide purified from slime of Physarum polycephalum.
Biochem Biophys Res Commun 1987;
146:61-6. [PMID:
3606625 DOI:
10.1016/0006-291x(87)90690-5]
[Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A polysaccharide was purified from the slime of a myxomycete, Physarum polycephalum, and its inhibitory effect on eukaryotic DNA polymerases was examined. Almost all the calf thymus DNA polymerase alpha activity was inhibited with higher than 0.2 mg/ml of the polysaccharide, when the assay was carried out with activated DNA as a template. The inhibitory effect occurred regardless of the amounts of the enzyme and deoxyribonucleotides, however, kinetic analysis revealed that the inhibition occurs competitively with the template DNA, the Ki value being 4 micrograms/ml. Inhibition was observed for DNA polymerase alpha, but not for DNA polymerases beta and gamma from various eukaryote species.
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