title: Structure of REC2, a recombinational repair gene of Ustilago maydis, and its function in homologous recombination between plasmid and chromosomal sequences.
abstract: Mutation in the REC2 gene of Ustilago maydis leads to defects in DNA repair, recombination, and meiosis. Analysis of the primary sequence of the Rec2 protein reveals a region with significant homology to bacterial RecA protein and to the yeast recombination proteins Dmc1, Rad51, and Rad57. This homologous region in the U. maydis Rec2 protein was found to be functionally sensitive to mutation, lending support to the hypothesis that Rec2 has a functional RecA-like domain essential for activity in recombination and repair. Homologous recombination between plasmid and chromosomal DNA sequences is reduced substantially in the rec2 mutant following transformation. The frequency can be restored to a level approaching, but not exceeding, that observed in the wild-type strain if transformation is performed with cells containing multiple copies of REC2.
authors.affiliation: Department of Microbiology, Cornell University Medical College, New York, New York 10021.
authors.forename: B P
authors.initials: BP
authors.lastname: Rubin
authors.forename: D O
authors.initials: DO
authors.lastname: Ferguson
authors.forename: W K
authors.initials: WK
authors.lastname: Holloman
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers / Q000737:chemistry; D004260:DNA Repair; D004271:DNA, Fungal / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics*; D005800:Genes, Fungal; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D011995:Recombination, Genetic; D015183:Restriction Mapping; D016415:Sequence Alignment; D013329:Structure-Activity Relationship; D014588:Ustilago / Q000235:genetics*
chemical_list: D017931:DNA Primers; D004271:DNA, Fungal; D005656:Fungal Proteins; C088888:REC2 protein, Ustilago maydis