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Original Article

Sulphitolysis in keratinolysis. Biochemical proof

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Pages 181-184 | Published online: 09 Jul 2009
 

Abstract

The presence of S-sulphocysteine in filtrates of the dermatophyte Keratinomyces ajelloi growing on human hair in a culture medium buffered by pH 7·4 by phosphates was demonstrated by means of ion exchange chromatography techniques. S-sulphocysteine being destroyed during acidic hydrolysis was identified after enzymic hydrolysis of dialyzed and lyophilized filtrates. This result indicates that sulphitolysis occurs during keratinolysis performed by K. ajelloi. As thiosulphuric esters were shown present in hair perforations made by Microsporum gypseum, we think sulphitolysis is a common mechanism developed by dermatophytes to attack keratin.

Résumé

La présence de S-sulfocystéine dans les filtrats du dermatophyte Keratinomyces ajelloi cultivé sur cheveu humain dans un milieu tamponné à pH 7.4 par les phophates a été démontré en utilisant les techniques de chromatographie d'échange d'ions. La S-sulfo-cystéine étant détruite au cours de l'hydrolyse acide, son identification fut faite après hydrolyse enzymatique des filtrats dialysés et lyophilisés.

Ce résultat indique que la sulfitolyse est effective pendant la kératinolyse réalisée par K. ajelloi. Comme les esters thiosulfuriques ont été mis en évidence dans les perforations faites sur le cheveu par Microsporum gypseum, nous pensons que la sulfitolyse est un mécanisme commun que développent les dermatophytes pour attaquer la kératine.

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