Identification and Nutrient Composition of a Wild Strain from Tibet, and the Antioxidant and Cytotoxic Activities of Polysaccharides from This Fungus.

The selection and breeding of high-quality wild edible fungal strains can bring significant economic and social benefits. A wild fungal strain (X21185) from the Tibetan Plateau was isolated and identified as a novel () based on its morphological and molecular characteristics. The appropriate culture conditions for were determined. The nutrient contents of fruiting bodies were analyzed. Compared with the conventional nutritional contents of the representative edible fungi ( and ) and egg, the protein, ash, and dietary fiber contents of were higher. Four types of essential amino acids, seven types of nonessential amino acids, the total essential and nonessential amino acids of were present in considerably higher quantities than those of representative edible fungi ( and ) and egg, respectively. polysaccharides (PPPs) had strong ABTS, DPPH, and hydroxyl free radical scavenging activities (EC: 0.051, 3.322, and 2.87 mg/mL, respectively), and the cytotoxicity was higher against HepG2 hepatocellular carcinoma cells (IC: 1.501 mg/mL) than against MDA-MB-468 triple-negative breast cancer cells (IC: 2.183 mg/mL). This study provides a foundation for the development of the novel wild strain.