Protein
RecBCD enzyme subunit RecD
Organism
Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155)
Function
A helicase/nuclease that prepares dsDNA breaks (DSB) for recombinational DNA repair. Binds to DSBs and unwinds DNA via a highly rapid and processive ATP-dependent bidirectional helicase activity. Holoenzyme degrades any linearized DNA that is unable to undergo homologous recombination. In the holoenzyme this subunit has ssDNA-dependent ATPase and 5'-3' helicase activity. When added to pre-assembled RecBC greatly stimulates nuclease activity and augments holoenzyme processivity (By similarity). Unlike the case in E.coli, suppresses RecA-dependent homologous recombination, is instead required for single-strand annealing pathway repair of DSB.
Similarity
Belongs to the RecD family.
Sequence
MSLLEAFAEILEPADVHVAQRLTVLADEPDASVELAVALAVRALRGGSVCVDLRSVAGQVELPDLPWPDPDAWLAALAASPLLGQPPVLRLFGDLLYLDRYWLEEQQVCDDVLALVSARPGGAVPDVSRLFGAGFEEQRAAAKVALSQGLTVLTGGPGTGKTTTVARLLALLAEQAALAGKPSPRIALAAPTGKAAARLQEAVQLEIDQLDLIERRRLTGLHATTLHRLLGPRPDTSSRFRHHRANRLPHDVIVVDETSMVSLTMMARLLEAVRPQTRLVLVGDPDQLASVEAGAVLADLVEGLGSRGVAELKTSHRFGESIGALASAIRTGDADAALAVLAAGGEHIEWVHEDPVEQLREVVVPHAMRLRQAAILGDQREALATLDEHRLLCAHRRGPAGVDHWNRQVQRWLGEETGEPLWGSWYVGRPILVTANDYGLKLYNGDTGVVVATPDGMRAVIGDAGTFATGRLTDVETMHAMTIHKSQGSQADEVTVLLPSEDSRLLTRELFYTAVTRAKTRVRVVGAEAEVRAAIERQAVRATGLRKRLRPAGV