SOME IMPORTANT NOTE ON GOLGI APPARATUS

SOME IMPORTANT NOTE ON GOLGI APPARATUS

• Golgi has two faces:-

I) Cis face- It is towards ER.
II) Trans face- It is towards plasma membrane.

• GERL REGION:- this is a region on which smooth endoplasmic reticulum, Golgi apparatus and lysosome constitued endomembrane system. To the trans face of Golgi is associated the trans reticular Golgi in which acid phosphatase enzyme make its first appearance.GERL is found to be involved in the origin of primary lysosomes.
• ZONE OF EXCLUSION:- a Golgi apparatus is surrounded by a differentiated region of cytoplasm where ribosomes, glycogen and organelles such as mitochondria and chloroplast are absent . This is called zone of exclusion . Even which endoplasmic reticulum lies in the zone lacks ribosome.

• Enzymes of Golgi apparatus:-

A) Glycosyl transferase :

      1. Sialyl transferase-- Transfer salic acid.

      2. Galctosyl transferase-- Transfer Galactose to lipids. 

B) Sulpho and glycotransferases : 

      1. Sulpho transferase--- Transfer sulphate.

      2. Lysolecithin acetyl transferase-- Transfer acyl group to phospholipid.

C) Oxido-reductase :

      1. NADH-cytochrome-c-reductase--- Add or remove H.

     

D) Phosphatases : 

     1. Glucose-6-phosphatase---- Remove phosphate.

     2. ATPase---- Removal or addition of phosphate.

    3. Acid phosphatase----- Removal of phosphate.

E) Kinase : 

      1. Casein phosphokinases----phosphorylation of casein.

Know about the structure of Golgi apparatus(click here)

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