Pharmacological Activities and Hydrolysis by Peptidases of [Phospho-Ser6]-Bradykinin (pS6-BK)

Diego M. Assis, Luiz Juliano, Thaysa Paschoalin, Maria Kouyoumdjian, Joao B. Calixto, Robson A S Santos, Thelma A. Pertinhez, Francis Gauthier, Thierry Moreau, Michael Blaber, Maria A. Juliano

Research output: Contribution to journalArticlepeer-review


Phosphorylated kininogen and some of its fragments containing serine phosphorylated bradykinin ([pS6]-Bk) were identified in human serum and plasma by a phosphoproteomic approach. We report the kininogenase ability of human tissue and plasma kallikreins and tryptase to generate [pS6]-Bk or Lys-[pS6]-Bk having as substrate the synthetic human kininogen fluorescent fragment Abz-MISLMKRPPGF[pS386]PFRSSRI-NH2. The pharmacological assays of [pS6]-Bk showed it as a full B2 bradykinin receptor agonist in smooth muscle, it produces a portal liver hypertensive response in rat and mouse paw edema that lasts longer than Bk. The rat hypotensive response to infusions of Bk is greater than that of [pS6]Bk, both if injected through femoral vein or aorta. [pS6]-Bk was more resistant than Bk to kininase digestion performed with angiotensin converting enzyme, neprilysin, thimet oligopeptidase, aminopeptidase P and carboxypeptidase M. 1H-NMR experiments indicated that [pS6]-Bk has lower flexibility, with the pS6-P7 bond restricted to the trans conformation, and can explain [pS6]-Bk resistance to hydrolysis. In conclusion, [pS6]-Bk presenting lower activity than Bk, with longer lasting effects and being slowly released by kininogenases from synthetic Abz-MISLMKRPPGF[pS386]PFRSSRI-NH2, suggests that phosphorylation of the kininogens can be an efficient kallikrein-kinin system regulator.

Original languageEnglish
Pages (from-to)203-214
Number of pages12
JournalBiochemical Pharmacology
Issue number2
Publication statusPublished - Sep 15 2015


  • Kallikreins
  • Kinin
  • Kininogen
  • Peptidase
  • Peptides
  • Protease
  • Tryptase

ASJC Scopus subject areas

  • Pharmacology
  • Biochemistry
  • Medicine(all)


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