Evidence that Cellulolysis by an Anaerobic Ruminal Fungus Is Catabolite Regulated by Glucose, Cellobiose, and Soluble Starch

AUTOR(ES)

Morrison, Mark

RESUMO

A Piromyces-like ruminal fungus was used to study preferential carbohydrate utilization of [U-14C]cellulose, both alone and in combination with several soluble sugars. For cells grown on cellulose alone, cellulolytic activity was immediate and, initially, greater than that observed in the presence of added carbohydrate. Cellulolytic activity remained minimal in cultures containing cellulose plus glucose or cellobiose until the soluble sugar was depleted. Soluble starch also regulated cellulose activity but to a lesser extent. The results presented suggest that some fungal cellulases are susceptible to catabolite regulatory mechanisms.

Documentos Relacionados

• Evidence that Cellulolysis by an Anaerobic Ruminal Fungus Is Catabolite Regulated by Glucose, Cellobiose, and Soluble Starch
• Evidence that a 77-kilodalton protein from the starch of pea embryos is an isoform of starch synthase that is both soluble and granule bound.
• Cellobiose versus glucose utilization by the ruminal bacterium Ruminococcus albus.
• Solubilization of lignin by the ruminal anaerobic fungus Neocallimastix patriciarum.
• Production of xylanase by the ruminal anaerobic fungus Neocallimastix frontalis.