Protein catabolism

In the intestine, the small peptides are broken down into amino acids that can be absorbed into the bloodstream.

For example, the chemical energy that is released by oxidization in a dehydrogenation reaction can be used to reduce NAD+ to NADH, which can then be fed directly into the Krebs/Citric Acid (TCA) Cycle.

Proteins are produced and destroyed routinely as part of the normal operations of the cell.

It is then released into the blood stream, where it is transferred to the kidneys, which will secrete the urea as urine.

[7] Transamination leads to the same result as deamination: the remaining acid will undergo either glycolysis or the TCA cycle to produce energy that the organism's body will use for various purposes.

[8] Some key factors that determine overall rate include protein half-life, pH, and temperature.

Depending on whether this step is short or long will influence the rest of the metabolic process.

One key component in determining the protein half-life is based on the N-end rule.