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Protein Science, Vol 7, Issue 4 951-960, Copyright © 1998 by Cold Spring Harbor Laboratory Press

ARTICLE

Mapping of the interleukin-10/interleukin-10 receptor combining site

U. REINEKE, R. SABAT, H. D. VOLK and J. SCHNEIDER-MERGENER
Present address: Jerini BioTools GmbH. Rudower Chaussee 5, 12489 Berlin, Germany.

The discontinuous interleukin-10(IL-10)/interleukin-10 receptor (IL-10R) combining site was mapped using sets of overlapping peptides derived from both binding partners bound to continuous cellulose membranes. Low affinity binding of single regions of the discontinuous contact sites on IL-10 and IL-10R could be identified due to (1) high peptide density on the membrane support, (2) incubation with high protein concentrations, (3) indirect immunodetection of the ligates after electrotransfer onto polyvinylene difluoride membranes, and (4) use of highly overlapping peptide scans of different length (6-mers and 15-mers). The single binding regions identified for each protein species are separated in the protein sequences, but form continuous areas on the surface of IL-10 (X-ray structure) and IL-10R (computer model). Furthermore, four epitopes of neutralizing anti-IL-10 and anti-IL-10R antibodies were mapped and overlap with these binding regions. Soluble peptides (15- to 19-mers) each spanning one of the three identified IL-10-derived receptor binding regions displayed no significant affinity to IL-10R as expected, whereas a peptide (35-mer) comprising two of these regions had considerably higher binding activity. The data are consistent with a previously published computer model of the IL-10/IL-10R complex. This approach should be generally applicable for the mapping of non-linear protein-protein contact sites.
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