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Dopamine beta-hydroxylase (DBH) was purified from bovine adrenal medullae. Rabbit IgG raised against DBH inhibited its activity by 80%. In an immunoblot analysis, the IgG specifically recognized two subunits of DBH the 72 and 75 KD components. Chromogranin A (CGA) also was purified from bovine adrenal medullae, and rabbit IgG against CGA recognized this chromogranin A in the immunoblot analysis. The intracellular distribution of DBH and CGA in bovine chromaffin cells was determined quantitatively by immunoelectron microscopy using post-embedding protein A-gold technique. DBH and CGA were localized exclusively on chromaffin granules. The binding of gold particles to these granules was saturable. The maximum number of gold particles bound to the granules roughly corresponded to the number of DBH or CGA molecules in the granules estimated biochemically. DBH was observed evenly in the periphery and in the dense matrix of the chromaffin granules.

Immunoelectron microscopic localization of dopamine .BETA.-hydroxylase and chromogranin A in adrenomedullary chromaffin cells.