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The microheterogeneity of rat androgen-binding protein from the testis, rete testis fluid, and epididymis, as demonstrated by immunoelectrophoresis and photoaffinity labeling.

Studies on the microheterogeneity of rat androgen-binding protein (rABP) were conducted using crossed immunoelectrophoresis (CIE) and photoaffinity labeling. rABP exhibits two molecular weight components of 45,000 (45K) and 41,000 (41K) which are designated heavy (H) and light (L) according to their mobilities during electrophoresis in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Two-dimensional electrophoresis of epididymal rABP revealed that the charge heterogeneity of the H differed from that of the L component. On the other hand, when highly purified rABP from rat epididymis was fractionated by CIE using isoelectric focusing, followed by electrophoresis into antibody-containing agarose gel, three species with identical immunological determinants were demonstrated. CIE was then used as a convenient technique to study partially purified samples from testis, rete testis fluid, and different portions of the epididymis. The results indicated that there is a loss of more acidic and an appearan...