Cloning and nucleotide sequence analysis of the chloramphenicol resistance gene on conjugative R plasmids from the fish pathogen Photobacteriumdamselae subsp. piscicida

Diseases of Aquatic Organisms

Hideaki Morii¹  Nobutaka Hayashi¹  Kiyoko Uramoto¹ 

关键词: Cloning;    Nucleotide sequence;    Chloramphenicol resistance gene;    Transferable R plasmid;    Photobacterium damselae subsp.;   

DOI  :  10.3354/dao053107

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Transferable resistance to various drugs was investigated in Photobacterium damselae subsp. piscicida from Japan. Drug resistances were transferred via plasmids of 100, 50, and 40 kb. Resistance to chloramphenicol (Cm^r)was transferred on plasmids of all 3 sizes. The Cm^r gene (cat) was cloned from the 50 kb plasmids pPDP8511 and pPDP9106 transferred from P. damselae subsp. piscicida strains isolated in different years and places in Japan.Subcloning localized the cat to within 1.5 kb HindIII-HincII (or PstI) fragments. Nucleotide sequences of the coding and flanking region of the cat were determined as 1607 bp (HindIII-HincII fragment) inpPDP8511 and 1568 bp (HindIII-PstI fragment) in pPDP9106, which corresponded with the sequence from nucleotides 40 to 1607 in pPDP8511. The nucleotide sequences identified an open reading frame (ORF) encoding 213 amino acid residues with acalculated molecular mass of about 24.8 kDa, a size consistent with the molecular mass of known cat gene products, and the ORF had maximum homology (99.5%) with a Type II CAT variant from Haemophilus influenzae.

【 授权许可】

Unknown