The below mentioned article provides study notes on Isoenzymes. Isoenzymes or isozymes are proteins which have different molecular and physicochemical properties, but have identical catalytic activity. They generally occur in branched metabolic pathways in which several end-products are synthesized from a common precursor molecule. A hypothetical branched pathway in which three different end-products, X, Y and Z, are synthesized from [...]
In this article we will discuss about the structure and function of various coenzymes. 1. NAD/NADP: Nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP) are derivatives of the B-vitamin, nicotinic acid. The structures are shown in Fig. 8.30: NAD and NADP act as conezymes for many degydrogenases where they are involved in transfer of hydrogen, causing either oxidation [...]
The below mentioned article provides notes on multi-enzyme complex. Many enzymes in living cells catalyse chains of reaction in a sequential order either in a biosynthetic or a catabolic pathway. In the preceding paragraphs hypothetical examples of such pathways have been cited. The series of enzymes catalyzing such chains of reactions are said to form a multi-enzyme system. In its [...]