"Animals"

Molecular forms of immunoactive atrial natriuretic peptide in the rat hypothalamus and atrium.

Acid extracts of rat hypothalamus and atrium were prepared by a procedure previously shown to minimize proteolytic degradation of peptides. The majority of the immunoactive material in the atrial extracts had a molecular weight of approximately 9,000 …

The alpha-amidation of alpha-melanocyte stimulating hormone in intermediate pituitary requires ascorbic acid.

Rat intermediate pituitary cells in primary culture display a time-dependent loss of the ability to produce COOH-terminally alpha-amidated alpha MSH (Glembotski, C.C., Eipper, B.A., and Mains, R.E. (1983) J. Biol. Chem. 258, 7299-7304). Instead of …

Characterization of a peptide alpha-amidation activity from rat anterior pituitary.

A secretory granule associated enzymatic activity from the rat anterior pituitary that can convert the synthetic peptide D-Tyr-Val-Gly into D-Tyr-Val-NH2 is described. Due to the presence of inhibitory activity in the cytosol and rough endoplasmic …

Peptide alpha-amidation activity in mouse anterior pituitary AtT-20 cell granules: properties and secretion.

Mouse anterior pituitary corticotropic tumor cells (AtT-20/D-16v) were homogenized and subjected to subcellular fractionation. A secretory granule associated enzyme activity was detected which could convert D-Tyr-Val-Gly into D-Tyr-Val-NH2. The …

Bovine intermediate pituitary alpha-amidation enzyme: preliminary characterization.

A secretory granule-associated enzymatic activity that converts mono-[125I]-D-Tyr-Val-Gly into mono-[125I]-D-Tyr-Val-NH2 has been studied. The activity is primarily soluble and shows optimal activity at pH 7 to pH 8. Amidation activity was stimulated …

Identification in pituitary tissue of a peptide alpha-amidation activity that acts on glycine-extended peptides and requires molecular oxygen, copper, and ascorbic acid.

An enzymatic activity capable of producing an alpha-amidated peptide product from its glycine-extended precursor has been identified in secretory granules of rat anterior, intermediate, and neural pituitary and bovine intermediate pituitary. High …

Adrenocorticotropin(1-14)OH-related molecules in primary cultures of rat intermediate pituitary cells. Identification and role in the biosynthesis of alpha-melanotropin.

The structures of the altered alpha-melanotropin (alpha MSH or alpha-N-acetyl-ACTH(1-13)NH2)-related molecules produced by cultured rat intermediate pituitary cells were investigated. Peptide analyses demonstrated that the alpha MSH-related molecules …

Selective loss of alpha-melanotropin-amidating activity in primary cultures of rat intermediate pituitary cells.

The production of alpha-melanotropin (alpha-N-acetyl-ACTH(1-13)NH2 (alpha MSH) in rat intermediate pituitary was investigated using reverse phase high performance liquid chromatography, immunoassays, and biosynthetic labeling. Extracts of rat …

Acetylation of alpha-melanotropin and beta-endorphin in the rat intermediate pituitary. Subcellular localization.

The subcellular site of the further processing (NH2-terminal acetylation and COOH-terminal proteolysis) of beta-endorphin-sized molecules in the rat intermediate pituitary has been studied. Rat intermediate pituitary primary cultures that had been …

Characterization of the peptide acetyltransferase activity in bovine and rat intermediate pituitaries responsible for the acetylation of beta-endorphin and alpha-melanotropin.