Polar amino acids

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 Polar amino acids
There are twenty amino acids, five of which are polar but uncharged. Two of which contain a hydroxyl group (-OH) attached to aliphatic side chain that is serine and threonine. As for the asparagine and glutamine they contain a terminal carboxamide in place of carboxylic acid. The fifth polar amino acid is cysteine that is structurally similar to serine but contain a sulfhydryl, or thiol (-SH), instead of the hydroxyl (-OH) group [1]. </b> All amino acids in solutions of a neutral pH form dipolar ions called zwitterions, the amine group being positive and the carboxyl group negative.

Polar amino acids

Serine Ser S
Cysteine Cys C
Threonine Thr T
Glutamine Gln Q
Asparagine Asn N


  1. Berg J., Tymoczko J and Stryer L, (2007) Biochemisty, 6th edition, New York: WH freeman.
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