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Two thiol-activated endopeptidases with pH optima near pH 7.5 were isolated from the supernatant fraction of rabbit brain homogenates by DEAE-cellulose chromatography, gel filtration and isoelectrofocusing. Peptide bond hydrolysis was measured quantitatively by ion-exchange chromatography with an amino acid analyzer. Brain kininase A hydrolyzes the(More)
Two forms of a proteinase, KN-BJ 1 and 2, were purified to homogeneity from the venom of Bothrops jararaca. In SDS/PAGE reduced KN-BJ 1 and 2 migrated as single bands with molecular masses of 38 kDa and 39 kDa. The two enzymes have similar N-terminal amino acid sequences and specific activities on synthetic chromogenic substrates, and both release(More)
Endooligopeptidase A was purified approximately 3 000-fold and endooligopeptidase B approximately 1200-fold from the 25 000g supernatant fraction of rabbit brain homogenate. The purified enzymes were homogeneous on the basis of acrylamide gel electrophoresis under denaturing and nondenaturing conditions, isoelectric focusing, immunochemical criteria, and(More)
Endo-oligopeptidase A, highly purified from the cytosol fraction of bovine brain by immunoaffinity chromatography, has been characterized as a thiol endopeptidase. This enzyme, known to hydrolyze the Phe5-Ser6 bond of bradykinin and the Arg8-Arg9 bond of neurotensin, has been shown to produce, by a single cleavage, Leu5-enkephalin or Met5-enkephalin from(More)
It has been previously reported that both the cysteinyl-endo-oligopeptidase A and the metalloendopeptidase EC 3.4.24.15 are able to generate enkephalin from a number of enkephalin-containing peptides, including dynorphin A1-8. The present study shows that only endo-oligopeptidase A is able to generate [Leu5]enkephalin and [Met5]enkephalin from dynorphin(More)
Rabbit brain endo-oligopeptidase B inactivates angiotensin I (Asp-Arg-Val-Tyr-Ile-His-Pro-Phe-His-Leu) and angiotensin II (Asp-Arg-Val-Tyr-Ile-His-Pro-Phe) by hydrolysis of the Pro7-Phe8 peptide bond. The site of hydrolysis was determined in preparative and analytical experiments in which both products were recovered in a molar ratio of 1:1, and the sum of(More)
An intramolecularly quenched fluorogenic peptide structurally related to Leu-enkephalin, containing o-aminobenzoyl (Abz) and ethylenediamine 2,4-dinitrophenyl (EDDnp) groups at amino- and carboxyl-terminal amino acid residues, Abz-Gly-Gly-D-Phe-Leu-Arg-Arg-Val-EDDnp (Abz-GGDFLRRV-EDDnp), was selectively hydrolyzed at the Arg-Val bond by neutral(More)