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Wednesday, 13 January 2021

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Glyoxisomes:-

               Glyoxisomes are specialized peroxisomes found in plants and fungi, especially in fat storage tissues in the germinating seeds and also in filamentous algae. Their main function is to convert fatty acids to carbohydrates. These glyoxisomes take part in photorespiration and nitrogen metabolism in root nodules. It was first discovered by 'Beevers' and 'Breidenbach' and they called these new organelles 'glyoxisomes'.



Structure:-

               Glyoxisomes are very small spherical bodies with a single unit membrane. Their internal content ie, the matrix is finely granular. In glyoxisomes, fatty acids are hydrolyzed to acetyl-CoA by peroxisomal β oxidation enzymes.  In sucrose gradient centrifugation, they have a high equilibrium density. It contains many enzymes such as isocratic lyase, malate synthetase, glycolate oxidase, etc. The enzymatic reactions can be explained below;


Glyoxalate cycle:- 

                    These Glyoxisomes play an important role in the glyoxylate cycle. This cycle is a tricarboxylic acid cycle that converts acetyl-CoA to succinate for the synthesis of carbohydrates. It is an anaerobic pathway found mainly in plants, bacteria, protists, and fungi but not in animals. These glyoxisomes also play a vital role in gluconeogenesis. This pathway allows cells to obtain energy from fat.The cycle can be described below;



  • Courtesy by google images

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