KREB’S CYCLE or TCACYCLE

 This cycle is named after H.A.Kreb. The Kreb’s cycle is also known as Tricarboxylic acid, (TCA) cycle, Organic acid cycle, Mitochondrial respiration, Oxidation of pyruvate, and Citric Acid cycle. It takes place in mitochondria where all the necessary enzymes required for it are found on cristae.

In this cycle, at first, the carbon atom 3or 4, then 2 or 5, and lastly carbon number 1 or 6 of the glucose molecules are released in the form of CO2 molecules. Various reactions of the Kreb’s (TCA) cycle is schematically

Significance of Kreb’s cycle.

Kreb’s cycle occupies a central and very important place in the various metabolism of plants.

i. It provides energy in the form of ATP molecules for various metabolic activities.

ii. It is directly related to nitrogen metabolism

iii. It is also intimately related to the fat metabolism

iv. It is closely associated with the glyoxalate cycle

v. It is related to other metabolic processes through its intermediates in one way or another.