Add time:08/14/2019         Source:sciencedirect.com

Colicins are usually released from producing cells by so-called lysis proteins. No sequence homologous to the structurally very similar colicin lysis genes was found in the gene cluster cmi cma cbi cba, which determines the activity and immunity proteins of colicin B and M on pColBM-Cl139. Instead, the region upstream of cmi contained sequences that showed 91% homology to the structural gene of protein D (resolvase) and 75.5% homology to the rfsF sequence of the Escherichia coli miniF plasmid. It is concluded that colicins B and M are not released via the activity of lysis proteins and that the highly homologous regions encode a resolvase and its target respectively.

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