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. 1980 Aug;143(2):825–833. doi: 10.1128/jb.143.2.825-833.1980

Hemolysis determinant common to Escherichia coli hemolytic plasmids of different incompatibility groups.

F de la Cruz, D Müller, J M Ortiz, W Goebel
PMCID: PMC294371  PMID: 6259123

Abstract

By using cloned deoxyribonucleic acid fragments from the hemolysis determinant of the hemolytic plasmid pHly152 as hybridization probes, a deoxyribonucleic acid segment of about 3.8 megadaltons was identified as a common sequence in several hemolytic (Hly) plasmids of Escherichia coli belonging in four different incompatibility groups. This segment contained the genetic information for the synthesis and secretion of the extracellular toxin alpha-hemolysin of E. coli. With the exception of pSU5, representing a composite plasmid, one part of which seems to be very similar to pHly152, the overall sequence homology of these Hly plasmids with pHly152 seems to be rather restricted. However, the Hly plasmid pSU316 showed sequence homology with pHly152 that did not extend beyond the hemolysis determinant. The two other plasmids, pSU233 and pSU105, also shared homology with pHly152 in the hemolysis determinant as well as in various other parts of this plasmid which did not seem to be directly linked to the hemolysis determinant. This suggests that the hemolysis determinant has spread to presumably unrelated plasmids of E. coli.

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Selected References

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