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• W2019338241 endingPage "87" @default.
• W2019338241 startingPage "75" @default.
• W2019338241 abstract "The degradation of thyroliberin (less than Glu-His-Pro-NH2) to its component amino acids by the soluble fraction of guinea pig brain is catalysed by four enzymes namely a pyroglutamate aminopeptidase, a post-proline cleaving enzyme, a post-proline dipeptidyl aminopeptidase and a proline dipeptidase. 1. The pyroglutamate aminopeptidase was purified to over 90% homogeneity with a purification factor of 2868-fold and a yield of 5.7%. In addition to catalysing the hydrolysis of thyroliberin, acid thyroliberin and pyroglutamate-7-amido-4-methylcoumarin the pyroglutamate aminopeptidase catalysed the hydrolysis of the peptide bond adjacent to the pyroglutamic acid residue in luliberin, neurotensin bombesin, bradykinin-potentiating peptide B, the anorexogenic peptide and the dipeptides pyroglutamyl alanine and pyroglutamyl valine. Pyroglutamyl proline and eledoisin were not hydrolysed. 2. The post-proline cleaving enzyme was purified to apparent electrophoretic homogeneity with a purification factor of 2298-fold and a yield of 10.6%. The post-proline cleaving enzyme catalysed the hydrolysis of thyroliberin and N-benzyloxycarbonyl-glycylproline-7-amido-4-methylcoumarin. It did not catalyse the hydrolysis of glycylproline-7-amido-4-methylcoumarin or His-Pro-NH2. 3. The post-proline dipeptidyl aminopeptidase was partially purified with a purification factor of 301-fold and a yield of 8.9%. The post-proline dipeptidyl aminopeptidase catalysed the hydrolysis of His-Pro-NH2 and glycylproline-7-amido-4-methylcoumarin but did not exhibit any post-proline cleaving endopeptidase activity against thyroliberin or N-benzyloxycarbonyl-glycylproline-7-amido-4-methylcoumarin. 4. Studies with various functional reagents indicated that the pyroglutamate aminopeptidase could be specifically inhibited by 2-iodoacetamide (100% inhibition at an inhibitor concentration of 5 microM), the post-proline cleaving enzyme by bacitracin (IC50 = 42 microM) and the post-proline dipeptidyl aminopeptidase by puromycin (IC50 = 46 microM). Because of their specific inhibitory effects these three reagents were key elements in the elucidation of the overall pathway for the metabolism of thyroliberin by guinea pig brain tissue enzymes." @default.
• W2019338241 created "2016-06-24" @default.
• W2019338241 creator A5020056670 @default.
• W2019338241 creator A5039258147 @default.
• W2019338241 date "1983-12-01" @default.
• W2019338241 modified "2023-10-01" @default.
• W2019338241 title "An evaluation of the role of a pyroglutamyI peptidase, a post‐proline cleaving enzyme and a post‐proline dipeptidyI amino peptidase, each purified from the soluble fraction of guinea‐pig brain, in the degradation of thyroliberin <i>in vitro</i>" @default.
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• W2019338241 doi "https://doi.org/10.1111/j.1432-1033.1983.tb07797.x" @default.
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