The below mentioned article provides a note on protein metabolism. Notion of Nitrogen Balance: If one determines, on the one hand, the quantity of nitrogen ingested by an animal and on the other hand the quantity excreted in urine and faeces, one may observe three situations: i. The nitrogen excreted is less than the nitrogen ingested, i.e. there is retention [...]
In this article we will discuss about the metabolism of sulphur-containing amino acids. There are 3 sulphur-containing amino acids, methionine, cysteine and cystine, but since the last two are very easily interconvertible by oxidation-reduction, they may be taken as one. Methionine is an essential amino acid — for rat as well as man - while cysteine is not. However, when [...]
In this article we will discuss about the two main types of general reactions in amino acids, i.e, enzymatic reactions using pyridoxal phosphate as the co-enzyme and deamination. 1. Enzymatic Reactions using Pyridoxal Phosphate as the Co-Enzyme: A number of reactions involving amino acids, like transamination, decarboxylation, elimination of the side chain with maintenance of the α-amino-car- boxylic group (e.g., [...]