Amino acid metabolism · Nitrogen balance protein catabolism, synthesis biosynthesis normal N balance: N ingested = N excreted negative N balance: N ingested < N excreted positive N balance: N ingested > N excreted Dietary protein amino acid pool N excretio (NH 4 + . urea)
22
Embed
Amino acid metabolism · Nitrogen balance protein catabolism, synthesis biosynthesis normal N balance: N ingested = N excreted negative N balance: N ingested.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Amino acid metabolism · Nitrogen balance
protein catabolism, synthesis biosynthesis
normal N balance: N ingested = N excreted
negative N balance: N ingested < N excreted
positive N balance: N ingested > N excreted
Dietary protein amino acid pool N excretion (NH4+. urea)
Requirement for essential amino acids
Amino acid catabolism · accounts for ~ 10% of energy requirement of adults · When: •· excess protein in diet (amino acids are not stored)
•· protein degradation exceeds demand for new protein
•· starvation when carbohydrates are not available
· (protein storing seeds such as beans, peas, etc.) ·
Glucogenic vs ketogenic amino acids
· ketogenic: yield AcCoA or AcAc as end products of
catabolism
- leu, lys
· glucogenic: are degraded to pyruvate or a member of the