Hydrolyzes intracellular trehalose to glucose (PubMed:12153582). The disaccharide trehalose serves as a storage carbohydrate that is mobilized during nutrient stress and spore germination (PubMed:11094289). Together with tps1, regulates the level of trehalose as a protectant for cell integrity during heat, osmotic and oxidative stresses (PubMed:9495778, PubMed:9974219, PubMed:12943532, PubMed:15965643). alpha,alpha-trehalose + H2O = alpha-D-glucose + beta-D-glucose May be activated by phosphorylation. Carbohydrate degradation. Homodimer (PubMed:12153582) (Probable). Homotrimer (PubMed:12153582) (Probable). Oligomerization occurs only in the presence of calcium (PubMed:12153582). Forms a complex composed of at least tpp1, tps1 and ntp1 (PubMed:12153582, PubMed:12943532, PubMed:15965643). Interacts with tpp1 (PubMed:12153582). Interacts with tps1; interaction is independent of stress conditions and oligomerization state (PubMed:12153582, PubMed:12943532, PubMed:15965643). Induced by thermal stress and osmotic stress (PubMed:9495778). Induced by oxidative stress (PubMed:9974219). Increases cellular trehalase level during osmotic stress and thermal stress (PubMed:12943532, PubMed:15965643). Resistant to heat shock and osmotic stress (PubMed:9495778). Delays spore germination (PubMed:11094289). Belongs to the glycosyl hydrolase 37 family.