R Plasmids in Streptococcus agalactiae (Group B) | Zendy

T Horodniceanu | Zendy; D. H. Bouanchaud | Zendy; G Bieth | Zendy; Y Chabbert | Zendy

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R Plasmids in Streptococcus agalactiae (Group B)

Author(s) -

T Horodniceanu,

D. H. Bouanchaud,

G Bieth,

Y Chabbert

Publication year - 1976

Publication title -

antimicrobial agents and chemotherapy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.07

H-Index - 259

eISSN - 1070-6283

pISSN - 0066-4804

DOI - 10.1128/aac.10.5.795

Subject(s) - plasmid , tetracycline , streptococcus agalactiae , lincomycin , microbiology and biotechnology , erythromycin , biology , chloramphenicol , streptococcaceae , strain (injury) , streptococcus , dna , antibiotics , bacteria , genetics , anatomy

Two plasmids determining resistance to tetracycline (RIP500) and to chloramphenicol, erythromycin, lincomycin, and pristinamycin I (RIP501) were isolated from a strain ofStreptococcus agalactiae . The frequency-of-resistance loss is very low for RIP500 (<3 × 104 ) but higher for RIP501 (the efficiency was dependent upon the curing agents and incubation temperature and varied between 0.5 and 96%). Derivatives susceptible to all drugs were also obtained. RIP500 and RIP501 have similar molecular weights (17.9 × 106 and 20 × 106 , respectively) and represent different percentages of total deoxyribonucleic acid (0.4 and 4%, respectively). The number of copies of RIP500 and RIP501 per cell is different, and these plasmids are likely replicated under different kinds of control (stringent and/or relaxed). No plasmid deoxyribonucleic acid was found in a derivative of strain B96 susceptible to all drugs.

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