TY - JOUR
T1 - HSV-1 glycoprotein I-reactive TCRγδ cells directly recognize the peptide backbone in a conformationally dependent manner
AU - Sciammas, Roger
AU - Bluestone, Jeffrey A.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1998/11/15
Y1 - 1998/11/15
N2 - Despite the description of numerous antigenic ligands recognized by TCRγδ cells, detailed information concerning the structural nature of these antigenic epitopes is lacking. In addition, the recent descriptions of human TCRγδ cells recognizing mycobacterium-derived low m.w. lipid molecules confirms that the spectrum and nature of biologic structures that are capable of being recognized by TCRγδ cells are unclear. We have previously described a murine TCRγδ cell clone, TgI4.4, that is reactive to herpes simplex virus (HSV)-1 glycoprotein I (gI). Unlike TCRαβ-mediated, MHC- restricted Ag recognition but similar to Ig Ag recognition, TgI4.4 recognizes purified gI directly, in the absence of Ag processing or presentation. Since gI is a complex glycoprotein, the nature of the antigenic epitope was investigated. First, gI recognition by TgI4.4 is conformationally dependent, as revealed by denaturation and proteolytic experiments. Secondly, the epitope recognized by TgI4.4 was mapped to the amino terminus by using insertion mutants of gI. Lastly, TgI4.4 recognizes the gI protein directly since completely deglycosylated forms of gI are efficiently recognized. Therefore, TCRγδ cells are capable of recognizing a variety of molecular structures, including proteins. The ability of TgI4.4 to recognize a nonglycosylated form of gI suggests that HSV-I recognition by TCRγδ cells in vivo is not limited by cell-specific glycosylation patterns or glycosylation-dependent conformational influences.
AB - Despite the description of numerous antigenic ligands recognized by TCRγδ cells, detailed information concerning the structural nature of these antigenic epitopes is lacking. In addition, the recent descriptions of human TCRγδ cells recognizing mycobacterium-derived low m.w. lipid molecules confirms that the spectrum and nature of biologic structures that are capable of being recognized by TCRγδ cells are unclear. We have previously described a murine TCRγδ cell clone, TgI4.4, that is reactive to herpes simplex virus (HSV)-1 glycoprotein I (gI). Unlike TCRαβ-mediated, MHC- restricted Ag recognition but similar to Ig Ag recognition, TgI4.4 recognizes purified gI directly, in the absence of Ag processing or presentation. Since gI is a complex glycoprotein, the nature of the antigenic epitope was investigated. First, gI recognition by TgI4.4 is conformationally dependent, as revealed by denaturation and proteolytic experiments. Secondly, the epitope recognized by TgI4.4 was mapped to the amino terminus by using insertion mutants of gI. Lastly, TgI4.4 recognizes the gI protein directly since completely deglycosylated forms of gI are efficiently recognized. Therefore, TCRγδ cells are capable of recognizing a variety of molecular structures, including proteins. The ability of TgI4.4 to recognize a nonglycosylated form of gI suggests that HSV-I recognition by TCRγδ cells in vivo is not limited by cell-specific glycosylation patterns or glycosylation-dependent conformational influences.
UR - http://www.scopus.com/inward/record.url?scp=0032534061&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032534061&partnerID=8YFLogxK
U2 - 10.4049/jimmunol.161.10.5187
DO - 10.4049/jimmunol.161.10.5187
M3 - Article
C2 - 9820489
AN - SCOPUS:0032534061
SN - 0022-1767
VL - 161
SP - 5187
EP - 5192
JO - Journal of Immunology
JF - Journal of Immunology
IS - 10
ER -