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MlaA, a hexameric ATPase linked to the Mre11 complex in archaeal genomes
Author(s) -
Manzan Angelo,
Pfeiffer Günter,
Hefferin Melissa L,
Lang Cara E,
Carney James P,
Hopfner KarlPeter
Publication year - 2004
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/sj.embor.7400037
Subject(s) - rad50 , biology , dna , genome , operon , atpase , genetics , microbiology and biotechnology , dna binding protein , gene , biochemistry , enzyme , escherichia coli , transcription factor
We identify and characterize MlaA, a novel protein, which is found in a conserved operon with Mre11 and Rad50 in archaeal genomes. MlaA is fused with Mre11 in Methanobacter thermoautotrophicus , suggesting the MlaA is functionally linked to the Mre11 complex. MlaA preferentially and cooperatively binds double‐stranded and secondary structure containing DNA and has double‐stranded but not single‐stranded DNA‐stimulated ATPase activity. Electron microscopy reveals that MlaA forms a 360‐kDa hexameric ring structure with a central hole. Our data suggest that the archaeal Mre11 complex is associated with a novel hexameric ATPase that could be required for the processing of DNA double‐stranded breaks and recombination intermediates.