Dark Repair of Ultraviolet-Irradiated Deoxyribonucleic Acid by Bacteriophage T4: Purification and Characterization of a Dimer-Specific Phage-Induced Endonuclease-Reference-Cited by-同舟云学术

Dark Repair of Ultraviolet-Irradiated Deoxyribonucleic Acid by Bacteriophage T4: Purification and Characterization of a Dimer-Specific Phage-Induced Endonuclease

Published:1971-05 Issue:2 Volume:106 Page:500-507
ISSN:0021-9193
Container-title:Journal of Bacteriology
language:en
Short-container-title:J Bacteriol

Author:

Friedberg Errol C.¹,King John J.¹

Affiliation:

1. Department of Bacterial Immunology, Division of Communicable Diseases and Immunology, Walter Reed Army Institute of Research, Washington, D.C. 20012

Abstract

The purification and properties of an ultraviolet (UV) repair endonuclease are described. The enzyme is induced by infection of cells of Escherichia coli with phage T4 and is missing from extracts of cells infected with the UV-sensitive and excision-defective mutant T4V 1 . The enzyme attacks UV-irradiated deoxyribonucleic acid (DNA) containing either hydroxymethylcytosine or cytosine, but does not affect native DNA. The specific substrate in UV-irradiated DNA appears to be pyrimidine dimer sites. The purified enzyme alone does not excise pyrimidine dimers from UV-irradiated DNA. However, dimer excision does occur in the presence of the purified endonuclease plus crude extract of cells infected with the mutant T4V 1 .

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

Link

https://journals.asm.org/doi/pdf/10.1128/jb.106.2.500-507.1971

Reference20 articles.

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