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hsdM | DNA methylase M, host modification; Methylation of specific adenine residues; required for both restriction and modification activities (By similarity). The StySJI enzyme recognizes 5'-GAGN(6)GTRC-3'; Belongs to the N(4)/N(6)-methyltransferase family. (529 aa) | ||||
hsdS | Specificity determinant for hsdM and hsdR; The M and S subunits together form a methyltransferase (MTase) that methylates two adenine residues in complementary strands of a bipartite DNA recognition sequence. In the presence of the R subunit the complex can also act as an endonuclease, binding to the same target sequence but cutting the DNA some distance from this site. Whether the DNA is cut or modified depends on the methylation state of the target sequence. When the target site is unmodified, the DNA is cut. When the target site is hemimethylated, the complex acts as a maintenance M [...] (469 aa) | ||||
recA | DNA strand exchange and recombination protein; Can catalyze the hydrolysis of ATP in the presence of single- stranded DNA, the ATP-dependent uptake of single-stranded DNA by duplex DNA, and the ATP-dependent hybridization of homologous single-stranded DNAs. It interacts with LexA causing its activation and leading to its autocatalytic cleavage. (353 aa) |