Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Strand breaks and alkali-labile bonds induced by ultraviolet light in DNA with 5-bromouracil in vivo. [Escherichia coli]

Journal Article · · Biophys. J.; (United States)
Supercircular lambda phage DNA with 10 bromouracils/100 thymine bases, irradiated with 313 nm light in Tris buffer and sedimented on alkaline and neutral gradients, showed 4.6 alkali-labile bonds per true single-strand break, in agreement with Hewitt and Marburger (1975 Photochem. Photobiol. 21:413). The same DNA irradiated in Escherichia coli host cells showed about the same number of breaks in alkaline gradients for equal fluence, but only 0.5 alkali-labile bond per true break. Similarly, E. coli DNA with bromouracil irradiated in the cells showed only 10 to 20% more breaks when denatured with 0.1 M NaOH than under neutral conditions with 9 M sodium perchlorate at 50/sup 0/C. These results show that true single-strand breaks occur more frequently than alkali-labile bonds after ultraviolet irradiation of DNA containing bromouracil in cells.
Research Organization:
Yale Univ., New Haven, CT.
OSTI ID:
6504166
Journal Information:
Biophys. J.; (United States), Journal Name: Biophys. J.; (United States) Vol. 24:3; ISSN BIOJA
Country of Publication:
United States
Language:
English

Similar Records

Double-strand breaks from single photochemical events in DNA containing 5-bromouracil. [Escherichia coli; uv radiation]
Journal Article · Thu Nov 30 23:00:00 EST 1978 · Biophys. J.; (United States) · OSTI ID:6469972

Biopsy measurement of DNA damage and repair in vivo: single-strand breaks, alkali-labile bonds, and endonuclease-sensitive sites
Journal Article · Thu Jul 01 00:00:00 EDT 1982 · Radiat. Res.; (United States) · OSTI ID:6707886

STUDIES OF ULTRAVIOLET IRRADIATION OF ESCHERICHIA COLI CONTAINING 5- BROMOURACIL IN ITS DNA
Journal Article · Wed Jun 01 00:00:00 EDT 1960 · Journal of General Microbiology (England) · OSTI ID:4054852