What functional feature(s) does the phosphate group contribute to the structure of a phospholipid?

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22-09-2017
Biology

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What functional feature(s) does the phosphate group contribute to the structure of a phospholipid?

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Erudite1 Erudite1 · Answer 1 · 2017-09-29T16:35:30+02:00

The phospholipids molecules are made up of two fatty acid chain and one glycerol compound which is attached to a phosphate group. Phospholipids are divided into two distinct regions, the head and the tail regions. The head region is polar while the tail region is non-polar.
The phosphate group which is located at the head region of the phospholipid molecules causes the glycero head to become hydrophillic [water loving]. Thus, the phosphate group impact polarity property on the head region of the phospholipid molecules.

ardni313 ardni313 · Answer 2 · 2019-08-14T17:34:41+02:00

Phosphate groups play a role in the hydrophilic nature of phospholipids so that phospholipids are good emulsifiers because they can be attracted to water or oil

Further explanation

Lipids are a group of compounds which are generally not soluble in water but dissolve in non-polar organic solvents such as ether

Lipids themselves are divided into two groups, namely hydrolyzed lipids, and non-hydrolyzed lipids

Hydrolyzed lipids, for example, such as fat, and phospholipids

While lipids that are not hydrolyzed are steroids

Phospholipids are esters of glycerol but not all the OH groups are replaced by fatty acids (carboxylic acids)

Only R1 and R2 are replaced by carboxylic acids while R3 is replaced by phosphoric acid and choline or ethanolamine both contain Nitrogen

Phospholipids themselves are amphiphilic because their tails are hydrophobic (afraid of water) and nonpolar while their heads are hydrophilic (like water) and polar

This phosphoric acid bond with Nitrogen (choline/ethanolamine) compounds makes phospholipids a good emulsifier because they can be attracted to water and also oil.

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Keywords: phospholipid, emulsifier, hydrophobic, hydrophilic