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© Research
Publication : Molecular microbiology

Neutral trehalases catalyse intracellular trehalose breakdown in the filamentous fungi Aspergillus nidulans and Neurospora crassa

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular microbiology - 01 May 1999

d'Enfert C, Bonini BM, Zapella PD, Fontaine T, da Silva AM, Terenzi HF

Link to Pubmed [PMID] – 10320571

Mol. Microbiol. 1999 May;32(3):471-83

A cAMP-activatable Ca2+-dependent neutral trehalase was identified in germinating conidia of Aspergillus nidulans and Neurospora crassa. Using a PCR approach, A. nidulans and N. crassa genes encoding homologues of the neutral trehalases found in several yeasts were cloned and sequenced. Disruption of the AntreB gene encoding A. nidulans neutral trehalase revealed that it is responsible for intracellular trehalose mobilization at the onset of conidial germination, and that this phenomenon is partially involved in the transient accumulation of glycerol in the germinating conidia. Although trehalose mobilization is not essential for the completion of spore germination and filamentous growth in A. nidulans, it is required to achieve wild-type germination rates under carbon limitation, suggesting that intracellular trehalose can partially contribute the energy requirements of spore germination. Furthermore, it was shown that trehalose accumulation in A. nidulans can protect germinating conidia against an otherwise lethal heat shock. Because transcription of the treB genes is not increased after a heat shock but induced upon heat shock recovery, it is proposed that, in filamentous fungi, mobilization of trehalose during the return to appropriate growth is promoted by transcriptional and post-translational regulatory mechanisms, in particular cAMP-dependent protein kinase-mediated phosphorylation.