Expression of M type 12 protein by a group A streptococcus exhibits phaselike variation: evidence for coregulation of colony opacity determinants and M protein
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Expression of M type 12 protein by a group A streptococcus exhibits phaselike variation: evidence for coregulation of colony opacity determinants and M protein.
Three major categories of colony opacity were observed for natural variants of the M type 12 (M12) group A streptococcus strain CS24. Colony opacity variants that switched between two alternative categories at significantly high frequencies were identified and are referred to as switching between more opaque (Op+) and less opaque (Op-) phenotypes. Twenty lineages of such variants were derived f...
متن کاملIntracellular M Protein of Group a Streptococcus.
Fox, Eugene N. (University of Chicago, Chicago, Ill.). Intracellular M protein of group A Streptococcus. J. Bacteriol. 85:536-540. 1963.-A heat-labile M protein antigen in protoplasts of a type 14 strain of group A Streptococcus has been demonstrated in a soluble form in the cytoplasm, and also bound to the protoplasmic membrane. When trypsinized whole cells (from which the M protein on the cel...
متن کاملthe investigation of the relationship between type a and type b personalities and quality of translation
چکیده ندارد.
Purification of the extracellular opacity factor of a strain of group A Streptococcus M type 2.
The extracellular Opacity Factor elaborated by a strain of group A streptococcus M type 2 was purified by ammonium sulphate precipitation, DEAE-cellulose and hydroxylapatite column chromatography and Sephadex G-200 gel filtration. Gel filtration experiments indicated that the Opacity Factor is consituted of high molecular weight proteins or protein aggregates which appear to dissociate into sub...
متن کاملGroup G streptococcal M protein exhibits structural features analogous to those of class I M protein of group A streptococci.
We have previously studied a collection of group G streptococcal strains isolated from bacteremic human infections and demonstrated that such strains resist phagocytosis by human polymorphonuclear leukocytes but are type specifically opsonized by homologous antiserum. We have now performed Southern hybridization analysis on genomic DNA from eight blood isolates. All eight isolates showed DNA ho...
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ژورنال
عنوان ژورنال: Infection and Immunity
سال: 1987
ISSN: 0019-9567,1098-5522
DOI: 10.1128/iai.55.10.2448-2455.1987