To be or not to be a responder in T-cell responses: ubiquitous oligopeptides in all proteins.
Amino acid sequences of all proteins are essays written in the same language. Accordingly, the same set of words and phrases (oligopeptides) appear in totally unrelated proteins. The reason that only certain individuals of particular major histocompatibility complex (MHC) haplotypes can mount T-cell responses against a given antigen of pathogens is found in the fact that T-cell receptors are designed to recognize 18-20 residue-long peptide fragments sandwiched between two alpha-helices of class I or class II MHC molecules. At this range of peptide lengths, most would appear as self, while nonselfness of the remainders are destined to be quite ambiguous, hence creating responders and nonresponders.
Ohno
S
S
Beckman Research Institute of the City of Hope, Duarte, CA 91010-0269.
D000595:Amino Acid Sequence; D001324:Autoantigens / Q000276:immunology; D000939:Epitopes; D006680:HLA Antigens / Q000276:immunology; D006681:HLA-D Antigens / Q000276:immunology; D006239:Haplotypes; D006801:Humans; D009980:Influenza A virus / Q000276:immunology; D008285:Major Histocompatibility Complex; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000737:chemistry / Q000276:immunology*; D011960:Receptors, Estrogen / Q000737:chemistry / Q000276:immunology; D013329:Structure-Activity Relationship; D013601:T-Lymphocytes / Q000276:immunology*; D014763:Viral Matrix Proteins / Q000737:chemistry / Q000276:immunology
D001324:Autoantigens; D000939:Epitopes; D006680:HLA Antigens; D006681:HLA-D Antigens; D009842:Oligopeptides; D011960:Receptors, Estrogen; D014763:Viral Matrix Proteins