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J. Biol. Chem., Vol. 265, Issue 12, 6617-6623, Apr, 1990

The primary structure of glycoprotein III from bovine adrenal medullary chromaffin granules. Sequence similarity with human serum protein-40,40 and rat Sertoli cell glycoprotein

DJ Palmer and DL Christie
Department of Biochemistry, University of Auckland, Private Bag, New Zealand.

Glycoprotein III (GpIII) was purified from the soluble fraction of bovine chromaffin granules, the secretory vesicles of the adrenal medulla, by chromatography using wheat germ agglutinin-Sepharose followed by reverse-phase high performance liquid chromatography (HPLC). Characterization of this glycoprotein by sodium dodecyl sulfate- polyacrylamide gel electrophoresis, reverse-phase HPLC, amino acid analysis and partial NH2-terminal sequence analysis indicated that GPIII was a disulfide-linked heterodimer with 37-kDa subunits. Analysis of in vitro translation products of adrenal medullary poly(A)+ RNA by immunoprecipitation using an anti-GpIII serum and sodium dodecyl sulfate-polyacrylamide gel electrophoresis suggested that both subunits are synthesized from a single precursor. Partial NH2-terminal sequence analysis allowed construction of oligonucleotides which were used as primers for a polymerase chain reaction to generate a GpIII-specific DNA probe. This probe was used to isolate a cDNA clone encoding the GpIII precursor from a bovine adrenal medullary cDNA library. The predicted amino acid sequence of GpIII has greater than 80% similarity to human serum protein-40,40, a protein implicated in the complement system, and to a major secretory product of Sertoli cells, glycoprotein 2, which is thought to play a role in spermatogenesis. Northern blot analysis confirmed that RNA encoding GpIII is also abundant in liver, testis, and brain.
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