Biochemical Genetics

, Volume 26, Issue 11–12, pp 717–732 | Cite as

Altered expression of chitin synthetase activity and biochemical changes in the cell wall in a developmental mutant ofPhycomyces

  • Elvia Ruiz-Flores
  • Everardo Lopez-Romero
  • Arturo Flores-Carreon
  • Felix Gutierrez-Corona


ThePhycomyces developmental mutant S356 elaborates spores which show a much poorer viability and a higher affinity for Calcofluor White than the wild-type spores. Protease-activated extracts of the mutant spores showed higher levels of chitin synthetase activity than the parental strain-derived spores. High levels of enzyme activity in the mutant extracts, but not in the corresponding wild-type extracts, could be detected in the absence of an exogenous protease. The high basal active chitin synthetase is not the result of activation by endogeneous proteases during cell breakage since protease inhibitors did not reduce, but rather increased, the activity levels. The analysis of cell wall composition in the mutant spores revealed significant changes in the proportion of uronic acids and protein but not in chitin. The mutant phenotype is discussed in relation to the developmental stage at which the alterations connected with cell wall metabolism occurred.

Key words

Phycomyces spores developmental mutant Calcofluor chitin synthetase cell wall 


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Copyright information

© Plenum Publishing Corporation 1988

Authors and Affiliations

  • Elvia Ruiz-Flores
    • 2
  • Everardo Lopez-Romero
    • 2
    • 1
  • Arturo Flores-Carreon
    • 2
    • 1
  • Felix Gutierrez-Corona
    • 2
  1. 1.Departamento de Genetica y Biologia MolecularCentro de Investigacion y de Estudios Avanzados del IPNMexico
  2. 2.Instituto de Investigacion en Biologia Experimental, Facultad de QuimicaUniversidad de GuanajuatoGuanajuato, GtoMexico

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