Escherichia coli K317, formerly used to define colicin group E2, produces colicin E7, is immune to colicin E2, and carries a bacteriophage-restricting conjugative plasmid
- 1 November 1980
- journal article
- research article
- Published by American Society for Microbiology in Journal of Bacteriology
- Vol. 144 (2), 524-531
- https://doi.org/10.1128/jb.144.2.524-531.1980
Abstract
E. coli strain CL137, a K-12 derivative made E colicinogenic by contact with Fredericq''s strain K317, was unaffected by colicin E2-P9, but K-12 carrying ColE2-P9 was sensitive to the E colicin made by strains CL137 and K317. This colicin was named E7-K317 because by the test of colicinogenic immunity it differed from colicins E1-K30, E2-P9, and E3-CA38 and from recently recognized colicins termed E4Horak, E5 and E6. Strain K317 as conjugational donor transmitted E7 colicinogeny; about half the E7-colicinogenic transconjugants were immune to colicin E2-P9. A spontaneous variant of CL137 retained E7 colicinogeny but was sensitive to E2 colicins. The E2 immunity of strain CL137 and some E7-colicinogenic transconjugants is attributed to a colicin-immunity plasmid, ColE2imm-K317, from strain K317. Tra+ E7-colicinogenic transconjugants restricted phage BF23 in the same way as strains carrying ColIb-P9. Tra+ and restricting ability are attributed to a plasmid, pRES-K317, acquired from strain K317, and related to the ColI plasmids.This publication has 36 references indexed in Scilit:
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