منابع مشابه
Genetic transformation of Streptococcus mutans.
Three strains of Streptococcus mutans belonging to serotypes a, c, and f were transformed to streptomycin resistance by deoxyribonucleic acids derived from homologous and heterologous streptomycin-resistant strains of S. mutans and Streptococcus sanguis strain Challis. Homologous transformation of S. mutans was less efficient than heterologous transformation by deoxyribonucleic acids from other...
متن کاملCloning and characterization of Streptococcus mutans LM7 plasmid pAM7.
The 5.6-kilobase-pair cryptic plasmid, pAM7, of Streptococcus mutans LM7 was cloned into Escherichia coli plasmids or a shuttle plasmid to examine whether the plasmid encodes bacteriocin. Plasmid pAM7 encoded proteins with molecular weights of 30,000, 22,000, and 12,000, but none of them appeared to be bacteriocin.
متن کاملEvidence for a disseminated plasmid in Streptococcus mutans.
Based on a survey of 86 isolates, approximately 5% of all naturally occurring strains of Streptococcus mutans contains a 3.6 X 10(6)-dalton (3.6-megadalton) multicopy plasmid of unknown function. The amount of plasmid deoxyribonucleic acid per chromosome varies from 2 to 6% depending on the host strain. About 13% of the total covalently closed circular deoxyribonucleic acid in each of the four ...
متن کاملTransformation of fluoride resistance genes in Streptococcus mutans.
To study the nature of fluoride resistance in Streptococcus mutans, we transformed DNA extracted from fluoride-resistant mutants of S. mutans GS-5 into fluoride-sensitive cells of the same strain. Transformation with DNA from first-step mutants produced transformants with resistance to either 600 or 1,000 micrograms of sodium fluoride per ml, both of which are within the first-step resistance r...
متن کاملGenetic transformation of putative cariogenic properties in Streptococcus mutans.
Rough colonial morphology and bacteriocin production, two properties which may be associated with the cariogenicity of Streptococcus mutans, were transformed into several strain GS-5 mutants defective in each respective property. Transformation was determined by observing the frequency of cotransfer of these properties with different reference markers. The rough colonial transformants were iden...
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ژورنال
عنوان ژورنال: Infection and Immunity
سال: 1982
ISSN: 0019-9567,1098-5522
DOI: 10.1128/iai.36.1.435-436.1982