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Photochemical Attachment of lac Repressor to Bromodeoxyuridine-Substituted lac Operator by Ultraviolet Radiation

Authors
  • Syr-Yaung Lin
  • Arthur D. Riggs
Publication Date
Mar 01, 1974
Source
PMC
Keywords
Disciplines
  • Biology
  • Physics
License
Unknown

Abstract

The transducing phage λh80dlac carries the lac operator, whereas wild-type λh80 does not. We find that in high salt (0.18 M KCl), ultraviolet radiation causes the formation of a very stable complex between repressor and 5-bromodeoxyuridine (BrdU)-substituted λh80dlac but not to BrdU-λh80 DNA. Studies with inducers of the lac operon confirm the specificity of attachment. In low slat (0.01 M KCl), ultraviolet radiation will also attach repressor nonspecifically to BrdU-λh80 DNA. The stability of the complex suggests that covalent bonds are formed. We also report that another regulatory protein, the catabolite gene activator protein, can be attached similarly to DNA.

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