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Metabolism of sulfur-containing amino acids in the dermatophyte Microsporum gypseum I. Neutral amino acids

✍ Scribed by Doc. Dr. J. Kunert

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
620 KB
Volume
25
Category
Article
ISSN
0233-111X

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✦ Synopsis

Metabolism of sulfur-containing amino acids in the dermatophyte Microsporurn gypseurn I. Neutral amino acids J. KUNXRT (Beceived May 4 , 1984)

The dermatophyte ikiicrosporum gypseurn was cultivated on a glucose-arginine medium to which on out of six sulfur-containing amino acids was added (L-cystine, L-djenkolic acid, DL-lanthionhe DL-homocystine, L-mcthionine, or L-methionine-sulfone at a concentration of 5 mM with respect to sulfur content). The addition of these substances did not stimulate the growth and some amino acids (djenkolic acid and particularly methionine and methionine-sulfone) were inhibitory. All tested compounds were utilized during the growth not only as sulfur source but as a source of carbon and nitrogen as well. I n four substrates cxress sulfur was excreted after oxidation into the medium in the form of sulfate. Small amounts of sulfitc wcrc also observed. It usually reacted with remaining disulfidrs in the medium forming S-sulfo compounds (R-S.SO,H). Cystine and djenkolic acid were oxidized rapidly and completely. In contrast, lanthionine and particularly homocystine were oxidized slowly and only after a longer adaptation. To some extent lanthionine was already oxidized extracellularly in the medium. With methionine and its sulfone, excess sulfur was not removed by oxidation but by demethiolation to methane thiol and further volatile products.

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