Evidence for lack of DNA photoreactivating enzyme in humans - PubMed (original) (raw)
Evidence for lack of DNA photoreactivating enzyme in humans
Y F Li et al. Proc Natl Acad Sci U S A. 1993.
Abstract
Photoreactivating enzyme (DNA photolyase; deoxyribocyclobutadipyrimidine pyrimidine-lyase, EC 4.1.99.3) repairs UV damage to DNA by utilizing the energy of near-UV/visible light to split pyrimidine dimers into monomers. The enzyme is widespread in nature but is absent in certain species in a seemingly unpredictable manner. Its presence in humans has been a source of considerable controversy. To help resolve the issue we used a very specific and sensitive assay to compare photoreactivation activity in human, rattlesnake, yeast, and Escherichia coli cells. Photolyase was easily detectable in E. coli, yeast, and rattlesnake cell-free extracts but none was detected in cell-free extracts from HeLa cells or human white blood cells with an assay capable of detecting 10 molecules per cell. We conclude that humans most likely do not have DNA photolyase.
Comment in
- Photoreactivation in humans.
Ley RD. Ley RD. Proc Natl Acad Sci U S A. 1993 May 15;90(10):4337. doi: 10.1073/pnas.90.10.4337. Proc Natl Acad Sci U S A. 1993. PMID: 8506270 Free PMC article. Review. No abstract available.
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