1887

Abstract

Plasmid pHT128, a derivative of the broad-host-range IncQ vector pGSS33, was successfully introduced into . Under optimal conditions, pHT128 was transferred from to by triparental conjugation at a frequency of 10–10. The copy number of pHT128 in was almost the same as in , in which the copy number of IncQ plasmids per chromosome is estimated to be 10. pHT128 was maintained as an episome in in the presence of chloramphenicol, a marker of the plasmid. It was also shown that an or gene cloned on pHT128 could be expressed in under control of the promoter and could complement a mutation of or , respectively. In addition, the conjugational introduction of pHT128 into was demonstrated to be independent of natural transformation competence. All the results indicate that pHT128 is a useful vector for as a new genetical tool.

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2002-01-01
2021-10-25
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