Pa. Belavin et al., Multiplicity of site-specific DNA methyltransferases of the BstF5I restriction-modification system, MOL BIOL, 34(3), 2000, pp. 378-381
A fragment located downstream of the genes for DNA methyltransferases of Ba
cillus stearothermophilus F5 (M.BstF5I-I and M.BstF5I-2) was sequenced. The
fragment contains a gene for another methylase, M.BstF5I-3, structurally a
nd functionally similar to the N-terminal domain of M.FokI. Thus, in contra
st to other restriction-modification systems, the BstF5I system includes th
ree methylases, two being homologous to the individual M.FokI domains.