title: Partial N-terminal amino acid sequences of guinea pig classic histocompatibility antigens.
abstract: Partial N-terminal amino acid sequences were determined by microsequencing for three of the guinea pig GPLA-B classic histocompatibility antigens, which are presumably allelic products. The sequences of GPLA-B.1 derived from the noncongenic inbred strain 2 and strain 13 animals showed no differences a their N-termini, suggesting that these molecules are chemically as well as serologically identical. Two residues, isoleucine and leucine, were found at position 5 of the sequence of GPLA-B.1, suggesting that GPLA-S, the product of the second classic histocompatibility locus, was being cosequenced. GPLA-B.2 and GPLA-B.3 antigens showed distinct sequence differences from GPLA-B.1 and from each other. The sequences of GPLA-B.3 derived from a random-bred guinea pig and from the inbred DHCBA strain showed no differences and showed a possible species specific residue. All sequences showed significant homology with histocompatibility antigens of other species, suggesting a common evolutionary origin.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D006168:Guinea Pigs; D006649:Histocompatibility Antigens; D007519:Isoantigens / Q000302:isolation & purification; D007532:Isoleucine; D007930:Leucine
chemical_list: D006649:Histocompatibility Antigens; D007519:Isoantigens; D007532:Isoleucine; D007930:Leucine