PMID- 789348 OWN - NLM STAT- MEDLINE DCOM- 19761223 LR - 20210526 IS - 0021-9193 (Print) IS - 1098-5530 (Electronic) IS - 0021-9193 (Linking) VI - 128 IP - 1 DP - 1976 Oct TI - Molecular cloning of an Escherichia coli plasmid determinant than encodes for the production of heat-stable enterotoxin. PG - 463-72 AB - A conjugative plasmid, ESF0041 was isolated from an enterotoxigenic strain of Escherichia coli from calves. ESF0041 was found to be 65 x 10(6) daltons in mass of a member of the F incompatibility complex. Acquisition of ESF0041 by E. coli K-12 was invariably associated with the capacity to produce heat-stable (ST) enterotoxin. ESF0041 and pSC101 deoxyribonucleic acids were cleaved with EcoRI, and the fragments were ligated with polynucleotide ligase. Transformation of E. coli K-12 with the ligation mixture led to the isolation of an ST+ clone. Further analysis of the plasmid deoxyribonucleic acid from this clone showed that a structural gene(s) associated with ST biosynthesis had been isolated as a 5.7 x 10(6)-dalton ESF0041 fragment in pSC101. In turn, 5.7 x 10(6)-dalton fragment was ligated to a multicopy COLE1 derivative, RSF2124, so that toxin synthesis was amplified about threefold. FAU - So, M AU - So M FAU - Boyer, H W AU - Boyer HW FAU - Betlach, M AU - Betlach M FAU - Falkow, S AU - Falkow S LA - eng PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - J Bacteriol JT - Journal of bacteriology JID - 2985120R RN - 0 (Enterotoxins) SB - IM MH - DNA Replication MH - Enterotoxins/*biosynthesis MH - *Escherichia coli/metabolism MH - *Extrachromosomal Inheritance MH - *Genes MH - *Plasmids MH - Transformation, Genetic PMC - PMC232874 EDAT- 1976/10/01 00:00 MHDA- 1976/10/01 00:01 PMCR- 1976/10/01 CRDT- 1976/10/01 00:00 PHST- 1976/10/01 00:00 [pubmed] PHST- 1976/10/01 00:01 [medline] PHST- 1976/10/01 00:00 [entrez] PHST- 1976/10/01 00:00 [pmc-release] AID - 10.1128/jb.128.1.463-472.1976 [doi] PST - ppublish SO - J Bacteriol. 1976 Oct;128(1):463-72. doi: 10.1128/jb.128.1.463-472.1976.