Abstract

Previously we had discovered unusual enzymatic activity in the marine sponge Axinella polypoides, ATP N-glycosidase (Reintamm et al., 2003). We show here that the Ephydatia muelleri mRNA encoding protein with PNP_UDP_1 (phosphorylase superfamily) signature is the secreted ATP N-glycosidase. The functionality of the protein was established by recombinant expression in Pichia pastoris. In addition to the enzymatic domain, the full-length protein contains the N-terminal cysteine-rich domain belonging to the subfamily SCP_HrTT-1 (cd05559) of the SCP (sperm coating protein) superfamily (cl00133).

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