title: Two Haemophilus influenzae Rd genes that complement the recA-like mutation rec-1.
abstract: Two Haemophilus influenzae Rd genes each complemented the pleiotropic defects of the recA-like mutation rec-1. One gene, fec, was isolated on a 3.6-kilobase-pair EcoRI restriction fragment by complementation of the Fec- phenotype of bacteriophage lambda. The other gene, rec, was identified on a 3.1-kilobase-pair EcoRI fragment by Southern hybridization by using recA-like gene probes from Erwinia carotovora and Pseudomonas aeruginosa PAO. In a rec-1 strain of H. influenzae, the cloned genes restored resistance to UV irradiation, transformation by chromosomal DNA, and spontaneous release of HP1 prophage to wild-type levels. The fec and rec genes were located on the cloned segments by insertion and deletion mutagenesis and subcloning. The restriction endonuclease cleavage maps of the two DNAs were similar but not identical. Southern hybridization demonstrated that the two EcoRI restriction fragments contained homologous DNA sequences, but a fec gene-specific probe was prepared. Each gene encoded a 38,000-dalton polypeptide.
authors: Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
authors: G J
authors: GJ
authors: Barcak
authors: J F
authors: JF
authors: Tomb
authors: C S
authors: CS
authors: Laufer
authors: H O
authors: HO
authors: Smith
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics*; D015139:Blotting, Southern; D003001:Cloning, Molecular; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D006193:Haemophilus influenzae / Q000235:genetics*; D008970:Molecular Weight; D011938:Rec A Recombinases / Q000235:genetics*; D011995:Recombination, Genetic; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
chemical_list: D001426:Bacterial Proteins; D011938:Rec A Recombinases