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Extracellular enzymatic activity in 11 Cryptococcus species.

P García-Martos1, P Marín, J M Hernández-Molina

  • 1Hospital Universitario Puerta del Mar, Cádiz, Spain. pedromartos@hotmail.com

Mycopathologia
|June 8, 2001
PubMed
Summary

This study analyzed the enzymatic profiles of 36 Cryptococcus yeast strains using the API-ZYM system. Results show distinct enzymatic patterns useful for identifying Cryptococcus species and their enzymotypes for epidemiology.

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Area of Science:

  • Mycology
  • Biochemistry
  • Microbial Identification

Background:

  • The genus Cryptococcus comprises medically and ecologically significant yeasts.
  • Accurate identification of Cryptococcus species is crucial for clinical and epidemiological studies.
  • Enzymatic profiles offer a potential avenue for differentiating yeast species.

Purpose of the Study:

  • To investigate the extracellular enzymatic activity of various Cryptococcus species.
  • To determine the differences in enzymatic profiles among 11 Cryptococcus species.
  • To assess the utility of the API-ZYM system for Cryptococcus identification and differentiation.

Main Methods:

  • Utilized the API-ZYM commercial system to analyze extracellular enzymatic activity.
  • Tested 36 yeast strains from 11 Cryptococcus species, including C. neoformans and C. albidus.

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  • Documented positive, negative, and variable enzymatic activities for each strain.

    • Main Results:

    • All strains exhibited consistent activity for alkaline phosphatase, esterase lipase C8, leucine arylamidase, acid phosphatase, and Naphthol-AS-BI-phosphohydrolase.
    • Variable activities were observed for esterase C4, valine arylamidase, cystine arylamidase, alpha-galactosidase, alpha-glucosidase, beta-glucosidase, N-acetyl-beta-glucosaminidase, and alpha-fucosidase.
    • Eleven distinct enzymatic patterns were identified, with specific patterns correlating to certain species or groups of species.

    Conclusions:

    • The API-ZYM system effectively differentiated between Cryptococcus species based on their enzymatic profiles.
    • Enzymatic patterns generated by API-ZYM can aid in the identification of Cryptococcus species.
    • This method shows promise for differentiating Cryptococcus enzymotypes for epidemiological investigations.