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J Bacteriol. 1972 August; 111(2): 443-446
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Cell Wall Alterations Associated with the Hyperproduction of Extracellular Enzymes in Neurospora crassa

¹ Papanicolaou Cancer Research Institute, and Department of Biology, University of Miami, Miami, Florida 33136

ABSTRACT

A pleiotropic mutation in Neurospora (exo-1), which confers derepression of -amylase, glucoamylase, ß-fructofuranosidase, and trehalase, appears to also affect the composition of the cell wall. Segregants resulting from the backcross of exo-1 to the wild-type strain from which it derived are altered in the ratio of galactosamine to glucosamine in hydrolysates of isolated cell walls. Conidial cell walls exhibit a marked decrease in the amount of galactosamine in both exo-1 and exo-1⁺ strains. Increased levels (approximately sevenfold) of amylase are found in conidia of exo-1, as compared with those of exo-1⁺.