Characterization of a -type site-specific DNA modification system in the avermectin-producer permits investigation of two novel giant linear plasmids, pSA1 and pSA2 Free

Abstract

The degradation of DNA samples analysed by conventional pulsed-field gel electrophoresis was shown to be due to Trisdependent, double-strand cleavage. Using alternative electrophoretic conditions, separation of intact DNA molecules was achieved, permitting the identification of two novel giant linear plasmids: the 100 kb pSA1 and 250 kb pSA2. Use of pSA2 DNA as a probe showed that pSA1 does not cross-hybridize indicating that the plasmids are not closely related. The site-specificity of the DNA modifications, which render the DNA susceptible to Tris-dependent cleavage, was found to be essentially identical to that of similar modifications found in the DNA of .

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1994-06-01
2024-03-28
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