Detection Method:Sandwich
Test principle:This assay employs a two-site sandwich ELISA to quantitate PRB2 in samples. An antibody specific for PRB2 has been pre-coated onto a microplate. Standards and samples are pipetted into the wells and anyPRB2 present is bound by the immobilized antibody. After removing any unbound substances, a biotin-conjugated antibody specific for PRB2 is added to the wells. After washing, Streptavidin conjugated Horseradish Peroxidase (HRP) is added to the wells. Following a wash to remove any unbound avidin-enzyme reagent, a substrate solution is added to the wells and color develops in proportion to the amount of PRB2 bound in the initial step. The color development is stopped and the intensity of the color is measured.
Product Overview:The Ps proteins of saliva are so called because they are parotid size variants, i.e., variants in the size of parotid salivary protein. The polymorphism is determined by 1 unexpressed and 2 expressed alleles at an autosomal locus. The electrophoretic polymorphism is manifested by apparent differences in molecular weights between the Ps proteins which are glycosylated. Ps and Pm are closely linked to Pr, Pa, Db, and G1.
Goodman and Karn (1983) presented evidence supporting the conclusion of Azen and Denniston (1980) that there is a molecular weight difference between the 2 allelic proteins Ps-1 and Ps-2. The difference appears to be due to an extension of the Ps-2 chain (presumably at its COOH-end). Minaguchi et al. (1988) described new variants.
