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Role of deoxyribonucleic acid ligase in a doxyribonucleic acid membrane fraction extracted from pneumococci.

作者信息

Greene M, Firshein W

出版信息

J Bacteriol. 1976 May;126(2):777-84. doi: 10.1128/jb.126.2.777-784.1976.

DOI:10.1128/jb.126.2.777-784.1976
PMID:4433
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC233213/
Abstract

Deoxyribonucleic acid (DNA) ligase has been detected in a DNA membrane fraction extracted from Pneumococcus. The specific activity of the enzyme in this fraction is 10-fold greater than in the remaining cell extract. It remains firmly bound (with other enzymes) to the complex after a purification procedure in which a considerable percentage of the macromolecules are dissociated. The ligase acts in two ways in the DNA membrane fraction in vitro. One, it catalyzes the linkage of small-molecular-weight pieces of newly synthesized DNA into heavier-molecular-weight DNA strands as shown by others (M Gellert, 1976; R. Okazaki, A. Sugino, S. Hirose, T. Okazaki, Y. Imae, R. Kainuma-Kuroda, T. Ogawa, M. Arisawa, and Y. Kurosowa, 1973; B. Olivera and I. Lehman, 14; and A. Sugino, S. Hirose, and R. Okazaki, 1972) and, two, it protects DNA from degradation by deoxyribonucleases. This latter effect is due to a competition between the ability of the nucleases to degrade DNA and the ability of DNA ligase to seal the nicks produced by these degradative enzymes. The ligase acts cooperatively with other enzymes in the DNA membrane fraction to synthesize DNA.

摘要

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本文引用的文献

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