In:
The Journal of Immunology, The American Association of Immunologists, Vol. 161, No. 10 ( 1998-11-15), p. 5472-5480
Abstract:
Using a lymphocyte binding assay, we have previously demonstrated that the CD4 protein can mediate cell adhesion by direct interaction with MHC class II molecules. In this report, we have used this assay to test whether synthetic peptides, corresponding to DRβ sequences, could inhibit CD4-class II adhesion. A peptide derived from sequences within the β1 domain (DRβ41–55), as well as two peptides derived from sequences within the β2 domain (DRβ121–135 and DRβ141–155), were shown to inhibit CD4-class II adhesion. Inasmuch as a site for CD4 binding in the β2 domain had been previously documented, these studies were designed to investigate the role of the β1 domain as an additional site of interaction with CD4. Sixteen site-specific mutations were engineered within the β1 domain of DRβ1*0101. Several mutations were shown to disrupt CD4-dependent T cell activation. Based on these results, we propose a model for the molecular interaction of CD4 with MHC class II proteins in which both the β1 and β2 domains of class II interact with the two amino-terminal Ig-like domains of CD4.
Type of Medium:
Online Resource
ISSN:
0022-1767
,
1550-6606
DOI:
10.4049/jimmunol.161.10.5472
Language:
English
Publisher:
The American Association of Immunologists
Publication Date:
1998
detail.hit.zdb_id:
1475085-5
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