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. 1959 Dec 1;110(6):853-74.
doi: 10.1084/jem.110.6.853.

Studies of L forms and protoplasts of group A streptococci. I. Isolation, growth, and bacteriologic characteristics

E H FREIMER, R M KRAUSE, M McCARTY

Studies of L forms and protoplasts of group A streptococci. I. Isolation, growth, and bacteriologic characteristics

E H FREIMER et al. J Exp Med. .

Abstract

L forms of Group A streptococci have been isolated by the use of penicillin gradient agar plates. Osmotically fragile protoplasts of Group A streptococci have been obtained by the use of Group C phage-associated lysin which lyses Group A streptococci and their isolated cell walls. Membranes surrounding these enzymatically derived protoplasts have been isolated, and chemical and immunological studies indicate that they are free of cell wall carbohydrate and M protein. The streptococcal protoplasts reproduce as colonies which are morphologically indistinguishable from streptococcal L forms. Evidence is presented to show that these two streptococcal derivatives are serologically and physiologically related to each other as well as to the parent streptococcal strain from which they were isolated.

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References

    1. Nature. 1958 Sep 20;182(4638):808-9 - PubMed
    1. J Exp Med. 1958 Jun 1;107(6):797-812 - PubMed
    1. Proc Soc Exp Biol Med. 1954 Oct;87(1):94-7 - PubMed
    1. J Exp Med. 1958 Dec 1;108(6):803-21 - PubMed
    1. J Gen Microbiol. 1957 Jun;16(3):584-95 - PubMed