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. 1971 Dec;22(6):963–973. doi: 10.1128/am.22.6.963-973.1971

Evaluation of Methods Used to Purify Acid-Extracted Group A Streptococcal M Protein

Lawrence S Phillips 1,1, Leo Pine 1
PMCID: PMC376470  PMID: 5002902

Abstract

The literature includes descriptions of both acid-soluble and acid-insoluble M protein in the preparation of “hot acid-extracted group A streptococcal M protein.” We present evidence for the contamination of crude type 1 acid-insoluble M protein. The purification of preparations of crude and partially purified acid-soluble type 1 and type 12 M protein is described. Our quantitative criteria for purification were recovery of M precipitin activity, improvement in specific activity, and removal of carbohydrate. Exclusion of nucleic acid is also discussed. Greater purification in a single passage was found with a carboxymethylcellulose column (with acidic elution) than with hydroxyapatite, diethylaminoethyl-Sephadex, or carboxymethyl-cellulose (with neutral elution) columns or with ammonium sulfate fractional precipitation. Carboxymethylcellulose with acidic elution was found to be a satisfactory standard laboratory procedure for the preparation of purified acid-extracted (acid-soluble) group A streptococcal M protein.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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