Abstract
Small peptides, 8-10 aminoacids long, derived from degradation of cytoplasmic proteins by a proteasome-proteinase complex, are usually presented and recognized by CD8+ cytolytic T lymphocytes (CTLs) associated with major histocompatibility complex (MHC) class I molecules. Recently synthetic peptides were used for the in vitro induction of tumor-specific CTLs, offering another strategy in the study of the immune-response repertoire and providing a new tool in cancer vaccination and immunotherapy. Peptides derived from otherwise normal proteins, overexpressed in many tumors as products of the protooncogene, may represent a target for an immune response. This is the case of HER-2/neu gene (also known as ErbB-2), encoding a cysteine-rich glycoprotein transmembrane receptor with tyrosine kinase activity (gp185neu). Recent data, demonstrating that HLA-A2.1.-related peptides are able to stimulate in vitro CD8+ lymphocytes, prompted us to study the binding to HLA-A2.1 molecules of several gp185 synthetic peptides containing a cystein residue and to define the relevance of this amino acid residue in the reduced or oxidated form of the sulfhydryl group. We found that monomers and their homodimers, linked by a disulfide bridge, bind to HLA-A2.1 molecules with overlapping affinity. These results suggest that additional amino acids of the nonapeptide do not prevent the binding and the HLA refolding through chemical or sterical interactions. This might be of particular relevance for the in vivo processing of cysteine-rich proteins. Because ErbB-2 molecules, as tumor-differentiation antigens in melanoma, are cysteine-rich molecules, it may be relevant to evaluate the possible role of the cystine residues interacting with the T-cell receptor. The recognition of these heretodimers by CD8+ lymphocytes will require functional in vivo studies.
| Original language | English |
|---|---|
| Pages (from-to) | 431-436 |
| Number of pages | 6 |
| Journal | Journal of Immunotherapy |
| Volume | 20 |
| Issue number | 6 |
| Publication status | Published - 1997 |
Fingerprint
Keywords
- Cysteine
- Cystine
- ErbB-2
- HLA-A2.1
- Peptides
ASJC Scopus subject areas
- Cancer Research
- Pharmacology
- Immunology
Cite this
MHC-peptide binding : Dimers of cysteine-containing nonapeptides bind with high affinity to HLA-A2.1 Class I molecules. / Di Modugno, Francesca; Mammi, Caterina; Rosanò, Laura; Rubiu, Oriana; Nisticò, Paola; Chersi, Alberto.
In: Journal of Immunotherapy, Vol. 20, No. 6, 1997, p. 431-436.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - MHC-peptide binding
T2 - Dimers of cysteine-containing nonapeptides bind with high affinity to HLA-A2.1 Class I molecules
AU - Di Modugno, Francesca
AU - Mammi, Caterina
AU - Rosanò, Laura
AU - Rubiu, Oriana
AU - Nisticò, Paola
AU - Chersi, Alberto
PY - 1997
Y1 - 1997
N2 - Small peptides, 8-10 aminoacids long, derived from degradation of cytoplasmic proteins by a proteasome-proteinase complex, are usually presented and recognized by CD8+ cytolytic T lymphocytes (CTLs) associated with major histocompatibility complex (MHC) class I molecules. Recently synthetic peptides were used for the in vitro induction of tumor-specific CTLs, offering another strategy in the study of the immune-response repertoire and providing a new tool in cancer vaccination and immunotherapy. Peptides derived from otherwise normal proteins, overexpressed in many tumors as products of the protooncogene, may represent a target for an immune response. This is the case of HER-2/neu gene (also known as ErbB-2), encoding a cysteine-rich glycoprotein transmembrane receptor with tyrosine kinase activity (gp185neu). Recent data, demonstrating that HLA-A2.1.-related peptides are able to stimulate in vitro CD8+ lymphocytes, prompted us to study the binding to HLA-A2.1 molecules of several gp185 synthetic peptides containing a cystein residue and to define the relevance of this amino acid residue in the reduced or oxidated form of the sulfhydryl group. We found that monomers and their homodimers, linked by a disulfide bridge, bind to HLA-A2.1 molecules with overlapping affinity. These results suggest that additional amino acids of the nonapeptide do not prevent the binding and the HLA refolding through chemical or sterical interactions. This might be of particular relevance for the in vivo processing of cysteine-rich proteins. Because ErbB-2 molecules, as tumor-differentiation antigens in melanoma, are cysteine-rich molecules, it may be relevant to evaluate the possible role of the cystine residues interacting with the T-cell receptor. The recognition of these heretodimers by CD8+ lymphocytes will require functional in vivo studies.
AB - Small peptides, 8-10 aminoacids long, derived from degradation of cytoplasmic proteins by a proteasome-proteinase complex, are usually presented and recognized by CD8+ cytolytic T lymphocytes (CTLs) associated with major histocompatibility complex (MHC) class I molecules. Recently synthetic peptides were used for the in vitro induction of tumor-specific CTLs, offering another strategy in the study of the immune-response repertoire and providing a new tool in cancer vaccination and immunotherapy. Peptides derived from otherwise normal proteins, overexpressed in many tumors as products of the protooncogene, may represent a target for an immune response. This is the case of HER-2/neu gene (also known as ErbB-2), encoding a cysteine-rich glycoprotein transmembrane receptor with tyrosine kinase activity (gp185neu). Recent data, demonstrating that HLA-A2.1.-related peptides are able to stimulate in vitro CD8+ lymphocytes, prompted us to study the binding to HLA-A2.1 molecules of several gp185 synthetic peptides containing a cystein residue and to define the relevance of this amino acid residue in the reduced or oxidated form of the sulfhydryl group. We found that monomers and their homodimers, linked by a disulfide bridge, bind to HLA-A2.1 molecules with overlapping affinity. These results suggest that additional amino acids of the nonapeptide do not prevent the binding and the HLA refolding through chemical or sterical interactions. This might be of particular relevance for the in vivo processing of cysteine-rich proteins. Because ErbB-2 molecules, as tumor-differentiation antigens in melanoma, are cysteine-rich molecules, it may be relevant to evaluate the possible role of the cystine residues interacting with the T-cell receptor. The recognition of these heretodimers by CD8+ lymphocytes will require functional in vivo studies.
KW - Cysteine
KW - Cystine
KW - ErbB-2
KW - HLA-A2.1
KW - Peptides
UR - http://www.scopus.com/inward/record.url?scp=0030775352&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030775352&partnerID=8YFLogxK
M3 - Article
C2 - 9409448
AN - SCOPUS:0030775352
VL - 20
SP - 431
EP - 436
JO - Journal of Immunotherapy
JF - Journal of Immunotherapy
SN - 1053-8550
IS - 6
ER -