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Molecular basis for oviductin‐mediated processing from gp43 to gp41, the predominant glycoproteins of Xenopus egg envelopes

Molecular basis for oviductin‐mediated processing from gp43 to gp41, the predominant... Acquisition of fertilizability in Xenopus coelomic eggs is correlated with the conversion from coelomic to vitelline envelope during passage of the eggs through the pars recta portion of oviduct. The conversion includes processing of a major envelope constituent gp43 of coelomic envelopes to gp41 of vitelline envelopes by a trypsin‐type protease, oviductin, which is secreted from the pars recta. Our recent sequencing analyses [Kubo et al., (1997): Dev Growth Diff 39:405–411] strongly suggested that the N‐terminal portion of gp41 is exposed as a result of oviductin digestion. In this study, a monoclonal antibody specific to the predicted N‐terminus of gp41 was raised by immunizing mice with a synthetic N‐terminal hexapeptide (QLPVSP) coupled to keyhole limpet hemocyanin. The antibody specifically reacted to gp41, but not to gp43, indicating that Gln62 is exposed as the N‐terminal amino acid of gp41 by oviductin‐mediated cleavage of gp43 at Arg61 in GSR61. The C‐terminal sequencing of gp43 and gp41 indicated that Arg373 in GSR373 as the C‐terminus of gp41 is generated by cleavage of three amino acid (WNQ) residues from the C‐terminus of gp43. The resulting polypeptide moiety of gp41 has a molecular mass of 33900 Da with 312 amino acid residues. We propose that oviductin possessing the substrate specificity of GSR simultaneously digests gp43 at Arg residues in GSR61 and GSR373 to generate the N‐ and C‐terminus of gp41, respectively. Dev. Genet. 25:123–129, 1999. © 1999 Wiley‐Liss, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genesis: the Journal of Genetics and Development Wiley

Molecular basis for oviductin‐mediated processing from gp43 to gp41, the predominant glycoproteins of Xenopus egg envelopes

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References (49)

Publisher
Wiley
Copyright
"Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
1526-954X
eISSN
1526-968X
DOI
10.1002/(SICI)1520-6408(1999)25:2<123::AID-DVG6>3.0.CO;2-3
pmid
10440846
Publisher site
See Article on Publisher Site

Abstract

Acquisition of fertilizability in Xenopus coelomic eggs is correlated with the conversion from coelomic to vitelline envelope during passage of the eggs through the pars recta portion of oviduct. The conversion includes processing of a major envelope constituent gp43 of coelomic envelopes to gp41 of vitelline envelopes by a trypsin‐type protease, oviductin, which is secreted from the pars recta. Our recent sequencing analyses [Kubo et al., (1997): Dev Growth Diff 39:405–411] strongly suggested that the N‐terminal portion of gp41 is exposed as a result of oviductin digestion. In this study, a monoclonal antibody specific to the predicted N‐terminus of gp41 was raised by immunizing mice with a synthetic N‐terminal hexapeptide (QLPVSP) coupled to keyhole limpet hemocyanin. The antibody specifically reacted to gp41, but not to gp43, indicating that Gln62 is exposed as the N‐terminal amino acid of gp41 by oviductin‐mediated cleavage of gp43 at Arg61 in GSR61. The C‐terminal sequencing of gp43 and gp41 indicated that Arg373 in GSR373 as the C‐terminus of gp41 is generated by cleavage of three amino acid (WNQ) residues from the C‐terminus of gp43. The resulting polypeptide moiety of gp41 has a molecular mass of 33900 Da with 312 amino acid residues. We propose that oviductin possessing the substrate specificity of GSR simultaneously digests gp43 at Arg residues in GSR61 and GSR373 to generate the N‐ and C‐terminus of gp41, respectively. Dev. Genet. 25:123–129, 1999. © 1999 Wiley‐Liss, Inc.

Journal

Genesis: the Journal of Genetics and DevelopmentWiley

Published: Jan 1, 1999

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