Identification of two V beta 7-specific viral superantigens.
The commonly used strains of laboratory mice have mouse mammary tumor viruses (MTV) integrated at various locations in their DNA. The number and position of these integrants varies from one strain of mouse to another. It has recently been shown that the genomes of many of the MTV code for superantigens. The predicted amino acid sequences of these superantigens and their specificity for TCR V beta differs for each MTV integrant. This study contains the predicted amino acid sequence and V beta specificity of two MTV superantigens that had not previously been analyzed. The results show that both of these MTV superantigens are specific for TCR that bear V beta 7, but unlike the MTV7 superantigen not for receptors bearing V beta 6 or V beta 8.1. The data also support the conclusion of previous studies that the COOH-terminal sequence of these proteins is a major factor in controlling their V beta reactivity.
Ignatowicz
L
L
Howard Hughes Medical Institute, Department of Medicine, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206.
Kappler
J W
JW
Marrack
P
P
Scherer
M T
MT
D000595:Amino Acid Sequence; D000818:Animals; D000956:Antigens, Viral / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D001483:Base Sequence; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D008969:Molecular Sequence Data; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000276:immunology*; D018089:Superantigens / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D014407:Tumor Cells, Cultured; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology*
D000956:Antigens, Viral; C084778:M12 protein, Mouse mammary tumor virus; D008562:Membrane Glycoproteins; D016693:Receptors, Antigen, T-Cell, alpha-beta; D018089:Superantigens; D014759:Viral Envelope Proteins; C084777:viral superantigen 23, Mouse mammary tumor virus