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Mutational analysis of Brh2 reveals requirements for compensating mediator functions.

TitleMutational analysis of Brh2 reveals requirements for compensating mediator functions.
Publication TypeJournal Article
Year of Publication2011
AuthorsKojic M, Zhou Q, Fan J, Holloman WK
JournalMol Microbiol
Volume79
Issue1
Pagination180-91
Date Published2011 Jan
ISSN1365-2958
KeywordsDNA Mutational Analysis, DNA Repair, DNA Repair Enzymes, Fungal Proteins, Mutant Proteins, Protein Binding, Recombination, Genetic, Sequence Deletion, Ustilago
Abstract

Brh2, a member of the BRCA2 family of proteins, governs homologous recombination in the fungus Ustilago maydis through interaction with Rad51. Brh2 serves at an early step in homologous recombination to mediate Rad51 nucleoprotein filament formation and also has the capability to function at a later step in recombination through its inherent DNA annealing activity. Rec2, a Rad51 paralogue, and Rad52 are additional components of the homologous recombination system, but the absence of either is less critical than Brh2 for operational activity. Here we tested a variety of mutant forms of Brh2 for activity in recombinational repair as measured by DNA repair proficiency. We found that a mutant of Brh2 deleted of the non-canonical DNA-binding domain within the N-terminal region is dependent upon the presence of Rad52 for DNA repair activity. We also determined that a motif first identified in human BRCA2 as important in binding DMC1 also contributes to DNA repair proficiency and cooperates with the BRC element in Rad51 binding.

DOI10.1111/j.1365-2958.2010.07440.x
Alternate JournalMol. Microbiol.
PubMed ID21166902
PubMed Central IDPMC3056505
Grant ListGM042482 / GM / NIGMS NIH HHS / United States
GM079859 / GM / NIGMS NIH HHS / United States
R01 GM042482 / GM / NIGMS NIH HHS / United States
R01 GM042482-20 / GM / NIGMS NIH HHS / United States
R01 GM042482-21 / GM / NIGMS NIH HHS / United States
R01 GM079859 / GM / NIGMS NIH HHS / United States
R01 GM079859-03 / GM / NIGMS NIH HHS / United States
R01 GM079859-04 / GM / NIGMS NIH HHS / United States

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