cell surface structure biogenesis spore coat biogenesis UPa:UPA00950 pathway Biogenesis of spore coat, a complex multiprotein structure that plays an important role in spore germination and resistance to toxic chemicals. Other functions are assigned to the coat, from sensing the external environment through active enzymes present on its surface to protecting the spore from predation by phagocytic protozoans. In addition, the coat is a novel system for the display at the spore surface of heterologous antigens, enzymes, and bioactive molecules. GO:0042244