LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Bacteriophage DNA recombination. Molecular model showing DNA manipulation and recombination taking place at a Holliday junction with a bacteriophage enzyme. At top are strands of DNA (coloured spirals, deoxyribonucleic acid). At bottom is the tetrameric (four subunits) structure of lambda-int, the integrase protein from a lambda bacteriophage. This complex forms a Holliday junction where the genetic material is excised or integrated into the host chromosome. Bacteriophages are viruses that infect bacteria. The lambda bacteriophage infects enterobacteria.
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