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Extrachromosomal Gene Systems in Streptococcus Mutans

  • Francis L. Macrina
  • Susan S. Virgili
  • Carol L. Scott
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 107)

Abstract

Bacterial extrachromosomal elements (plasmids) are autonomously replicating molecules of covalently closed circular (CCC) deoxyribonucleic acid (DNA). The occurrence of plasmids in some species of streptococci has been well documented, and such plasmid-conferred phenotypes include multiple antibiotic resistance (1), bacteriocin and hemolysin production (2), conjugal donor ability (3), and the catabolism of protein and carbohydrates (4). Moreover, certain streptococcal plasmids are known to contain directly repeated DNA sequences which are capable of mediating selective gene amplification, presumably through a series of site-specific recombinational events (5). The rationale for study of bacterial plasmids has centered largely on their clinical and ecological significance. However, much recent effort in plasmid research has revolved around their use as genetic tools for the cloning and amplification of both homologous and heterologous genetic information (6).

Keywords

Streptococcus Mutans Multiple Antibiotic Resistance Oral Streptococcus Restriction Endonuclease Cleavage Hemolysin Production 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • Francis L. Macrina
    • 1
  • Susan S. Virgili
    • 1
  • Carol L. Scott
    • 1
  1. 1.Department of MicrobiologyVirginia Commonwealth UniversityRichmondUSA

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