Enzymes 2nd Year Nutrition
By
Eman Mokbel Alissa, Ph.D.Eman Mokbel Alissa, Ph.D.
Lecture (1): Lecture Content
• Enzyme definition
• Nomenclature
• Classification
• Coenzymes
• Properties
• 2 hypothesis of enzyme specificity
Lecture (2): Lecture Content
• Mechanism of enzyme action
• Mechanism of enzyme catalysis
• The Enzyme Substrate Complex
• Factors Affecting Reaction Velocity
• Enzymes Kinetics
• Michaelis-Menten equation
• Linweaver-plot
Lecture (3): Lecture Content
• Enzymes Inhibitors:
–Reversible and irreversible
–Competitive and noncompetitive
• Medical relevance of enzyme Inhibitors
• Antibiotics
• Enzymes Clinical Application
Lecture (4): Lecture Content
• Allosteric enzymes• Allosterism vs. Cooperativity• Allosteric Enzymes Kinetics• Feed back inhibition• Homotropic and Heterotropic effectors• Enzyme Activity Regulation• Enzyme measurements• Plasma Enzymes• Serum enzymes in Diagnosis• Isozymes
Amino Acids Amino Acids MetabolismMetabolism
2nd Year Nutrition
By
Eman Mokbel Alissa, Ph.D.Eman Mokbel Alissa, Ph.D.
Lecture (1) content
• amino acids in anabolic pathways• amino acids degradation• Carbon skeleton of amino acids• amino acids Pool • Inter-tissue Relationships in amino acids
Metabolism• Protein Turnover• Nitrogen balance• Digestion, Absorption and Transport
Lecture (2) content• Relationship to central metabolism• Nitrogen disposal
1. amino acids oxidases2. Transamination (aminotransferases/ transaminases)3. Glutamate dehydrogenase (amino acids oxidative
deamination)• Ammonia transport to liver
1. Glutamine cycle2. Glucose- Alanine cycle
• Urea Cycle– Regulation of urea cycle– Link between urea cycle and TCA cycle
Lecture (3) content
• Sources and Fates of Ammonia
• Hyperammonemia
• Essential and nonessential amino acids
• Glucogenic and ketogenic amino acids
• Synthesis and degradation in fasting and fed states
• Nonessential amino acids synthesis
Lecture (4) content
• Catabolism of carbon skeleton of amino acids
• Tetrahydrobiopterin (BH4)
• Role of folic acid in a a metabolism
• S-adenosyl methionine (SAM)
• Metabolism of branched chain amino acids
• Clinical relevance
Lecture (5) content
• Metabolic defects in a a metabolism
1. Phenylketonuria 2. Maple syrup
urine disease 3. Albinism 4. Homocystinuria 5. Alkaptonuria
• A A conversion to specialized products
1. Porphyrins
2. Catecholamines
3. γ-aminobutyrate
4. Glutathione
5. Creatine
6. Histamine
7. Serotonin
8. Melanin
Hormonal ControlHormonal Control 2nd Year Nutrition
By
Eman Mokbel Alissa, Ph.D.Eman Mokbel Alissa, Ph.D.
Lecture (1) content• Endocrine system• Cell to cell signaling • Feedback loops• Endocrine axis• Factors controlling hormone secretion• Assessment of endocrine control• Hormones Structure • Chemical nature• Signal transduction
– Hydrophobic hormones– Hydrophilic hormones
Lecture (2) content
• Overview
• Insulin
– Structure
– Synthesis
– Metabolic effects
– Mechanism of action
– Time course of insulin actions
Lecture (3) content
• Glucagon
– Metabolic effects
– Mechanism of action
• Epinephrine
– Metabolic effects
– Mechanism of action
Metabolic IntegrationMetabolic Integration22ndnd Year Nutrition Year Nutrition
By
Eman Mokbel Alissa, Ph.D.Eman Mokbel Alissa, Ph.D.
Lecture (1) content
• Major metabolic pathways
• Hormonal control• Fuel metabolism• Control of intermediates
flow through metabolic pathways
• Absorptive state• Liver
– CHO metabolism – Fat metabolism– A A metabolism
• Adipose tissue – CHO metabolism– Fat metabolism
• Resting skeletal muscle – CHO metabolism– Fat metabolism– A A metabolism
• Brain – CHO metabolism– Fat metabolism
Lecture (2) content
• Fasting state• Metabolic fuels• Enzymatic changes in
fasting state• Mechanisms involved
in switching hepaticmetabolism between the well-fed and starved state
• Postabsorptive state • Specialized tissues
• Liver – CHO metabolism– Fat metabolism
• Adipose tissue– CHO metabolism– Fat metabolism
• Resting skeletal muscle– CHO metabolism– Fat metabolism
• Brain– CHO metabolism – Fat metabolism