An Mrr-family nuclease motif in the single polypeptide restriction-modification enzyme LlaGI.
An Mrr-family nuclease motif in the single polypeptide restriction-modification enzyme LlaGI.
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DOI:
10.1093/nar/gkp795
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发表时间:
2009-11
影响因子:
14.9
通讯作者:
Szczelkun MD
中科院分区:
文献类型:
--
作者:
Smith RM;Josephsen J;Szczelkun MD
Bioinformatic analysis of the putative nuclease domain of the single polypeptide restriction–modification enzyme LlaGI reveals amino acid motifs characteristic of the Escherichia coli methylated DNA-specific Mrr endonuclease. Using mutagenesis, we examined the role of the conserved residues in both DNA translocation and cleavage. Mutations in those residues predicted to play a role in DNA hydrolysis produced enzymes that could translocate on DNA but were either unable to cleave the polynucleotide track or had reduced nuclease activity. Cleavage by LlaGI is not targeted to methylated DNA, suggesting that the conserved motifs in the Mrr domain are a conventional sub-family of the PD-(D/E)XK superfamily of DNA nucleases.
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