2001
DOI: 10.1007/s002030000235
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Glutamate decarboxylase activity in Trichoderma viride conidia and developing mycelia

Abstract: Glutamic acid decarboxylase (GAD) activity was measured in homogenates of conidia and both submerged and aerial mycelia of Trichoderma viride. The GAD activity in conidia had a temperature optimum at 30 degrees C and a pH optimum at pH 4. GAD was stimulated by EDTA (2 mM) and was insensitive to treatment with calmodulin antagonists calmidazolium (10 microM) or phenothiazine neuroleptics (60 microM). Cyclosporin A (up to 300 microM) partially inhibited GAD in the homogenate, but not in the supernatant obtained … Show more

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Cited by 23 publications
(21 citation statements)
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“…We do not know whether these changes are causally related to cellulase formation. However, ␥-aminobutyric acid is a sporulation-specific metabolite in Trichoderma (26), and cellulase expression is triggered during conidiation (14). There also could be a link between D-sorbitol utilization and cellulase formation since D-sorbitol can be converted to L-sorbose by an NADP-dependent ketose reductase (23), and L-sorbose can induce cellulases in H. jecorina (19).…”
Section: Discussionmentioning
confidence: 99%
“…We do not know whether these changes are causally related to cellulase formation. However, ␥-aminobutyric acid is a sporulation-specific metabolite in Trichoderma (26), and cellulase expression is triggered during conidiation (14). There also could be a link between D-sorbitol utilization and cellulase formation since D-sorbitol can be converted to L-sorbose by an NADP-dependent ketose reductase (23), and L-sorbose can induce cellulases in H. jecorina (19).…”
Section: Discussionmentioning
confidence: 99%
“…A few processes involving signalling pathways could be attributed to GABA. In Trichoderma viride, the latter was shown to be involved in sporulation (Strigacova et al, 2001), in yeast, GABA metabolism is a key contributor to the ability of cells to tolerate oxidative stress (Coleman et al, 2001) and in plants it may modulate quorum sensing of infecting bacteria (Chevrot et al, 2006). Considering that the shunt is specifically activated when F. graminearum grows on hop cell wall, GABA may play a signalling role in the induction of fungal enzymes responsible for the degradation of plant cell wall as suggested by Shelp et al (2006) in the communication between plants and fungi.…”
Section: Gaba-shuntmentioning
confidence: 98%
“…Activity of glutamic acid decarboxylase, which catalyses alpha-decarboxylation of l -glutamic acid forming gamma-amino butyric acid (GABA), is stimulated by light (Pokorny et al 2005; Strigacova et al 2001) in T. viride . This reaction belongs to the metabolic pathway called GABA shunt (Schmit and Brody 1975) and provides energy for conidia needed to survive and germinate.…”
Section: Metabolic Pathways As Output Pathways Of Light Signalingmentioning
confidence: 99%