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The Central Segment of Herpes Simplex Virus Type 1 Glycoprotein C (gC) Is Not Involved in C3b Binding: Demonstration by Using Monoclonal Antibodies and Recombinant gC Expressed in Escherichia coli

¹ Institute for Hygiene, University of Innsbruck, Fritz-Pregl-Strasse 3, A-6010 Innsbruck, Austria,
² Research Laboratories of Behringwerke AG, Postfach 1140, D-3550 Marburg, F.R.G.
and³ Basel Institute for Immunology, Postfach CH-4005 Basel, Switzerland

Three monoclonal antibodies (MAbs) have been raised against cell membrane-derived herpes simplex virus type 1 glycoprotein C (gC-1). By using different DNA constructs of gC-1 expressed in Escherichia coli the sites recognized by these antibodies could be assigned to a peptide in the more hydrophobic and probably non-glycosylated middle third of the gC-1 molecule. This peptide segment corresponds to a 571 bp segment on the gC-1 gene located between the NcoI and the NruI restriction sites. None of the three MAbs interfered with the binding of the human serum complement component C3b to gC, which has been shown to be rather glycosylation-dependent. Since the data of other groups have suggested that antibodies directed against all regions of gC-1 inhibit C3b binding to gC-1, whereas our results suggest that the central part of gC-1 is not actually involved in C3b-binding activity, it can be inferred that the N- and C-terminal segments are involved in C3b binding by gC-1.

Keywords: gC-1, monoclonal antibodies, HSV-1, recombinant gC

Received 2 November 1988; accepted 21 February 1989.

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