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Fungal laccases have been widely used in industry. The expression of laccase often is repressible by the primary carbon source glucose in many fungi. The underlying basis is largely unclear. We demonstrate here that a gene,TSP2 -1 , was required for laccase repression by glucose in the basidiomyceteCryptococcus neoformans .TSP2 -1 encodes a Tsp2-type tetraspanin. The disruption ofTSP2 -1 resulted in constant melanin formation and the expression of the laccase geneLAC1 . This derepression phenotype was restorable by 10 mM exogenous cyclic AMP (cAMP). A capsule defect in the mutanttsp2 -1 Δ also was restored by cAMP. The results indicate an interaction of Tsp2-1 with the cAMP-dependent protein kinase A (PKA) pathway that has been shown to modulate laccase repression and capsule biosynthesis in this fungus. Other roles ofTSP2 -1 , e.g., in maintaining cell membrane integrity and stress resistance, also were defined. This work reveals a Tsp2-1-dependent glucose repression inC. neoformans . The function of Tsp2-type tetraspanin Tsp2-1 is described for the first time.

Requirement of a Tsp2-Type Tetraspanin for Laccase Repression and Stress Resistance in the Basidiomycete Cryptococcus neoformans