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Characterization of immunologically active peptides from the cell wall of T.mentagrophytes

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Abstract

A low molecular weight fraction from chitinase digested cell walls ofT. mentagrophytes containing both polysaccharide and peptide moieties was found to have immunological reactivity at both the cellular and humoral level. This fraction (UM2(a)) was further degraded by treatment with either a combination of pronase and carboxypeptidase A or with trypsin. Peptides were separated from the carbohydrate-rich fraction by ultrafiltration. The carbohydrate-rich fraction retained the ability to induce both immediate and delayed skin reactions in sensitized guinea pigs and to stimulate the proliferation of sensitized lymphocytesin vitro. The peptide moieties retained reactivity in that they caused delayed reactions and lymphocyte proliferation but were unable to induce immediate or Arthus reactions in sensitized animals. Tryptic peptides from UM2(a) were purified by ion exchange chromatography. A high proportion of these peptides demonstrated immunological activity at both the cellular and humoral level since they were capable of inducing delayed reactions and/or lymphocyte transformation, as well as being capable of blocking the complement fixation reaction between UM2 (a) and specific antiserum.

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Authors and Affiliations

  1. Department of Microbiology, University of British Columbia, V6T 1W5, Vancouver, B.C., Canada

    A. Kh. Al-Rammahy, Julia G. Levy & Barbara Kelly

Authors
  1. A. Kh. Al-Rammahy
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  2. Julia G. Levy
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  3. Barbara Kelly
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Additional information

This work was supported by grant number 6411 from the Medical Research Council of Canada.

A. Kh. Al-Rammahy was supported by a scholarship from the Ministry of High Education, Iraq.

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Al-Rammahy, A.K., Levy, J.G. & Kelly, B. Characterization of immunologically active peptides from the cell wall of T.mentagrophytes. Mycopathologia 66, 139–146 (1979). https://doi.org/10.1007/BF00683962

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