Lecture on Urea Cycle (Ornithine Cycle):Steps, Enzymes, Energetics & Clinical Disorders |MBBS | TSMC

Master the Urea Cycle (also known as the Krebs-Henseleit or Ornithine Cycle) with this comprehensive biochemistry lecture from Tripura Santiniketan Medical College (TSMC). Dr. Debamita Datta provides an in-depth breakdown of how the body detoxifies ammonia into urea, a process essential for metabolic health.

This session is a must-watch for MBBS and medical students, covering every step from mitochondrial reactions to cytosolic pathways, metabolic energetics, and the clinical implications of urea cycle disorders.

Key Learning Objectives:

Pathway Overview: Understanding why the cycle is divided between the Mitochondria and the Cytoplasm [00:26].

Detailed Steps & Enzymes: A walkthrough of the 5 main reactions involving Carbamoyl Phosphate Synthetase I (CPS-I), Ornithine Transcarbamoylase (OTC), and Argininosuccinate Synthase/Lyase [01:34].

Metabolic Energetics: Why the urea cycle consumes 4 high-energy phosphate bonds but results in a net gain of 1.5 ATP via the TCA cycle link [24:21].

Regulation of the Cycle: Exploring fine regulation by N-Acetylglutamate (NAG) and coarse regulation through diet and starvation [32:31].

Clinical Disorders (Urea Cycle Defects): Identification of Hyperammonemia (Type I & II), Citrullinemia, Argininosuccinic Aciduria, and Argininemia [22:08].

Hepatic Encephalopathy: How ammonia toxicity crosses the blood-brain barrier, leading to hepatic coma and neurological symptoms [19:26].

Featured Timestamps:
[00:26] - Location of Urea Cycle (Mitochondria & Cytosol)
[01:34] - CPS-I: The Rate-Limiting Enzyme
[02:14] - Formation of Carbamoyl Phosphate
[04:43] - Why it’s called the Ornithine Cycle
[08:41] - Role of the Inner Mitochondrial Membrane
[10:03] - Synthesis of Argininosuccinate
[11:40] - Link between Urea Cycle and TCA Cycle (Krebs Bicycle)
[14:58] - Arginase & the Final Release of Urea
[19:26] - Ammonia Toxicity & Blood-Brain Barrier
[21:09] - Hepatic Coma & Portal Systemic Encephalopathy
[22:08] - Table of Urea Cycle Disorders & Enzyme Defects
[23:37] - Orotic Aciduria (OTC Deficiency)
[24:21] - Energetics: ATP Consumption vs. Net Gain
[29:57] - Symptoms of Hyperammonemia in Infants
[32:31] - Regulation by N-Acetylglutamate (NAG)

TRIPURA SANTINIKETAN MEDICAL COLLEGE & HOSPITAL
Real time Classroom Demonstration/
BIOCHEMISTRY LECTURE ON- UREA CYCLE AND DISORDERS ,
BY- DR. DEBAMITA DATTA
(MBBS Batch: 2025-26)
Conducted on: 17-02-26

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Видео Lecture on Urea Cycle (Ornithine Cycle):Steps, Enzymes, Energetics & Clinical Disorders |MBBS | TSMC канала Tripura Santiniketan Medical College