Reaction: Preferential cleavage at Gly-Ser-Arg373 of glycoprotein gp43 in Xenopus laevis coelemic egg envelope to yield gp41
Other name(s): oviductal protease
Comments: The egg envelope of the South African clawed frog (Xenopus laevis) is modified during transit of the egg through the pars rectus oviduct, changing the egg envelope from an unfertilizable form to a fertilizable form. This process involves the conversion of glycoprotein p43 to p41 by the pars recta protease oviductin. It is thought that the enzymatically active protease molecule comprises the N-terminal protease domain coupled to two C-terminal CUB domains, which are related to the mammalian spermadhesin molecules implicated in mediating sperm-envelope interactions . The enzyme is also found in the Japanese toad (Bufo japonicus) . Belongs in peptidase family S1.
Links to other databases: BRENDA, EXPASY, KEGG, MEROPS, Metacyc, CAS registry number: 342900-44-1
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2. Lindsay, L.L., Wieduwilt, M.J. and Hedrick, J.L. Oviductin, the Xenopus laevis oviductal protease that processes egg envelope glycoprotein gp43, increases sperm binding to envelopes, and is translated as part of an unusual mosaic protein composed of two protease and several CUB domains. Biol. Reprod. 60 (1999) 989-995. [PMID: 10084976]
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