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Suicidal Enzyme is: (AIIMS May 2013)
  • a)
    Lipoxygenase
  • b)
    Cyclooxygenase
  • c)
    Thromboxane Synthase
  • d)
    5' Nucleotidase
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Suicidal Enzyme is: (AIIMS May 2013)a)Lipoxygenaseb)Cyclooxygenasec)Th...
Cyclooxygenase is referred to as a 'suicide enzyme.' The deactivation of prostaglandin activity is partially due to an exceptional characteristic of cyclooxygenase, which is its ability for self-catalysed destruction; in other words, it acts as a 'suicide enzyme.' Quick overview of cyclooxygenase:
  • Cyclooxygenase (COX), also known as prostaglandin H synthase
  • Plays a role in the synthesis of prostanoids (prostaglandins, thromboxane, and prostacyclin)
  • Exhibits two activities: cyclooxygenase and peroxidase
  • Exists as two isoenzymes: COX-1 and COX-2
Drugs that act as inhibitors of COX include:
  • NSAIDs:
    • Aspirin: Inhibits both COX-1 and COX-2
    • Indomethacin and ibuprofen: Inhibit cyclooxygenases by competing with arachidonate
  • Coxibs: Selectively inhibit COX-2; however, some have been withdrawn or suspended from the market due to adverse side effects and safety concerns
Anti-inflammatory corticosteroids:
  • Completely inhibit the transcription of COX-2, but not COX-1
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