title: Photochemical cross-linking of the gene 5 protein.fd DNA complex from fd-infected cells.
abstract: The gene 5 protein.fd DNA complex, which is an intermediate in the life cycle of fd bacteriophage, was isolated from fd-infected cells. After ultraviolet irradiation, approximately 10% of the gene 5 protein was covalently linked to fd DNA via the sulfhydryl group of the single cysteine residue at position 33 in the gene 5 protein. When intact, infected cells were first irradiated with ultraviolet light and the gene 5 protein.DNA complex subsequently isolated, less than 1% of the bound protein in the complex was found to be cross-linked. While these results agree with our previous findings based on irradiation of the gene 5 protein.fd DNA complex formed from purified gene 5 protein and fd DNA, they differ from the results of Lica and Ray ((1977) J. Mol. Biol. 115, 45-59) who found high yields of cross-linked gene 5 protein.fd DNA complex after ultraviolet irradiation of intact cells.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D003090:Coliphages / Q000235:genetics*; D004279:DNA, Viral / Q000235:genetics* / Q000302:isolation & purification; D004926:Escherichia coli / Q000235:genetics*; D008970:Molecular Weight; D009838:Oligodeoxyribonucleotides / Q000032:analysis; D010446:Peptide Fragments / Q000032:analysis; D010777:Photochemistry; D014764:Viral Proteins / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D000596:Amino Acids; D004279:DNA, Viral; D009838:Oligodeoxyribonucleotides; D010446:Peptide Fragments; D014764:Viral Proteins