Baculovirus-expressed recombinant human zona pellucida glycoprotein-B induces acrosomal exocytosis in capacitated spermatozoa in addition to zona pellucida glycoprotein-C

Chakravarty, Sanchita ; Suraj, K. ; Gupta, Satish Kumar (2005) Baculovirus-expressed recombinant human zona pellucida glycoprotein-B induces acrosomal exocytosis in capacitated spermatozoa in addition to zona pellucida glycoprotein-C MHR: Basic Science of Reproductive Medicine, 11 (5). pp. 365-372. ISSN 1360-9947

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Official URL: http://molehr.oxfordjournals.org/content/11/5/365....

Related URL: http://dx.doi.org/10.1093/molehr/gah165

Abstract

To facilitate our understanding of the role of zona pellucida glycoproteins during fertilization in humans, recombinant human zona pellucida glycoprotein-A (hZPA), -B (hZPB) and -C (hZPC) were obtained by using Escherichia coli and baculovirus expression systems. Analysis by SDS-PAGE and Western blot of the Ni-NTA affinity purified recombinant proteins revealed that the baculovirus-expressed hZPA, hZPB and hZPC have an apparent molecular weight of ~110, ~70-75 and ~65kDa, respectively, as compared to ~80, ~65 and ~50?kDa of the respective E. coli-expressed proteins. Lectin binding studies revealed that the baculovirus-expressed recombinant zona proteins were glycosylated. Major oligosaccharides were represented by strong reactivity with Concanavalin A (mannose α 1-3 or mannose α 1-6 residues) and Jacalin (α-O glycosides of Gal or GalNAc moieties). A significant increase in acrosomal exocytosis was observed when capacitated human sperm were incubated in vitro with baculovirus-expressed hZPB (P=0.0005) and hZPC (P=0.0005) The E. coli-expressed hZPB, hZPC and baculovirus-expressed hZPA failed to induce any significant increase (P>0.05) in acrosome reaction. In contrast to hZPC, the acrosome reaction induced by recombinant hZPB was not inhibited by pertussis toxin. These studies, for the first time, have demonstrated that in humans, ZPB also induces acrosomal exocytosis through a Gi independent pathway.

Item Type:Article
Source:Copyright of this article belongs to Oxford University Press.
Keywords:Acrosome Reaction; Recombinant Human Zona Pellucida Glycoproteins Spermatozoa
ID Code:12014
Deposited On:10 Nov 2010 05:06
Last Modified:15 Feb 2011 07:00

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