Microcalorimetric Studies on Gene Promoter Function of Cloned DNA Fragements from Halobacterium halobium J7 Plasmid pHH205 in Escherichia coli TG1

Abstract

AbstractHalobacterium halobium is a typical kind of extremely halophilic bacterium. Combined with the antibiotic resistance assay, the microcalorimetric method was used to study the promoter function of the cloned DNA fragments from Halobacterium halobium J7 plasmid pHH205 in Escherichia coli TG1. The promoter probe vector, plasmid pKK232‐8, was used to form the recombinants. The DNA fragment, which is the promoter for the chloramphenicol acetyl transferase (CAT) gene in plasmid pKK232‐8, is about 800 bp, and the chloramphenicol resistance level presented by IC50 is about 200 µg·mL−1, which suggests a high promoter activity. The conclusions show that there probably exist double‐function or trinary‐function gene promoters in Halobacterium halobium, and Archaea may contain rich genetic resources.