Polar amino acids

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'''&nbsp;Polar amino acids'''<br>There are twenty amino acids, five of which are polar but uncharged. Two of which contain a [[Hydroxyl group|hydroxyl group]] (-OH) attached to [[Aliphatic side chain|aliphatic side chain]] that is ''[[Serine|serine]] ''and ''[[Threonine|threonine]]''. As for the [[Asparagine|''asparagine'']] and [[Glutamine|''glutamine'']] they contain a terminal carboxamide in place of carboxylic acid. The fifth polar amino acid is ''[[Cysteine|cysteine]]'' that is structurally similar to [[Serine|serine]] but contain a [[Sulfhydryl|sulfhydryl]], or [[Thiol|thiol]] (-SH), instead of the [[Hydroxyl|hydroxyl]] (-OH) group&nbsp;<ref>Berg J., Tymoczko J and Stryer L, (2007) Biochemisty, 6th edition, New York: WH freeman.</ref>. &lt;/b&gt; All amino acids in solutions of a neutral pH form dipolar ions called zwitterions, the amine group being positive and the carboxyl group negative.
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'''&nbsp;Polar amino acids'''<br>There are twenty amino acids, five of which are polar but uncharged. Two of which contain a [[Hydroxyl group|hydroxyl group]] (-OH) attached to [[Aliphatic side chain|aliphatic side chain]] that is ''[[Serine|serine]] ''and ''[[Threonine|threonine]]''. As for the [[Asparagine|''asparagine'']] and [[Glutamine|''glutamine'']] they contain a terminal carboxamide in place of carboxylic acid. The fifth polar amino acid is ''[[Cysteine|cysteine]]'' that is structurally similar to [[Serine|serine]] but contain a [[Sulfhydryl|sulfhydryl]], or [[Thiol|thiol]] (-SH), instead of the [[Hydroxyl|hydroxyl]] (-OH) group.&nbsp;All amino acids in solutions of a neutral pH form dipolar ions called zwitterions, the amine group being positive and the carboxyl group negative&nbsp;<ref>Berg J., Tymoczko J and Stryer L, (2007) Biochemisty, 6th edition, New York: WH freeman.</ref>. &lt;/b&gt; '''Polar amino acids'''  
 
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'''Polar amino acids'''  
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Revision as of 06:39, 10 January 2011

 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. All amino acids in solutions of a neutral pH form dipolar ions called zwitterions, the amine group being positive and the carboxyl group negative [1]. </b> Polar amino acids

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

References

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