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- W1993162271 abstract "1. Bradykinin (Bk; Arg1-Pro2-Pro3-Gly4-Phe5-Ser6-Pro7-Phe8-Arg8) inactivation by bulk isolated neurons from rat brain is described. 2. Bk is rapidly inactivated by neuronal perikarya (4.2 +/- 0.6 fmol/min/cell body). 3. Sites of inactivating cleavages, determined by a kininase bioassay combined with a time-course Bk-product analysis, were the Phe5-Ser6, Pro7-Phe8, Gly4-Phe5, and Pro3-Gly4 peptide bonds. The cleavage of the Phe5-Ser6 bond inactivated Bk at least five fold faster than the other observed cleavages. 4. Inactivating peptidases were identified by the effect of inhibitors on Bk-product formation. The Phe5-Ser6 bond cleavage is attributed mainly to a calcium-activated thiol-endopeptidase, a predominantly soluble enzyme which did not behave as a metalloenzyme upon dialysis and was strongly inhibited by N-[1(R,S)-carboxy-2-phenylethyl]-Ala-Ala-Phe-p-aminobenzoate and endo-oligopeptidase A antiserum. Thus, neuronal perikarya thiol-endopeptidase seems to differ from endo-oligopeptidase A and endopeptidase 24.15. 5. Endopeptidase 24.11 cleaves Bk at the Gly4-Phe5 and, to a larger extent, at the Pro7-Phe8 bond. The latter bond is also cleaved by angiotensin-converting enzyme (ACE) and prolyl endopeptidase (PE). PE also hydrolyzes Bk at the Pro3-Gly4 bond. 6. Secondary processing of Bk inactivation products occurs by (1) a rapid cleavage of Ser6-Pro7-Phe8-Arg8 at the Pro7-Phe8 bond by endopeptidase 24.11, 3820ACE, and PE; (2) a bestatin-sensitive breakdown of Phe8-Arg9; and (3) conversion of Arg1-Pro7 to Arg1-Phe5, of Gly4-Arg9 to both Gly4-Pro7 and Ser6-Arg9, and of Phe5-Arg9 to Ser6-Arg9, Phe8-Arg9, and Ser6-Pro7, by unidentified peptidases. 7. A model for the enzymatic inactivation of bradykinin by rat brain neuronal perikarya is proposed." @default.
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- W1993162271 date "1989-09-01" @default.
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- W1993162271 title "Enzymatic inactivation of bradykinin by rat brain neuronal perikarya" @default.
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- W1993162271 doi "https://doi.org/10.1007/bf00711417" @default.
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