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''' Polar amino acids'''<br>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 ''aspargaine ''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. <ref>Berg J., Tymoczko J and Stryer L, (2007) Biochemisty, 6th edition, New York: WH freeman.</ref><br> | ''' Polar amino acids'''<br>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 ''aspargaine ''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. <ref>Berg J., Tymoczko J and Stryer L, (2007) Biochemisty, 6th edition, New York: WH freeman.</ref><br> {| width="200" border="1" cellpadding="1" cellspacing="1" |+ '''Polar amino acids''' |- | Serine | Ser | S |- | Cysteine | Cys | C |- | Threonine | Thr | T |- | Glutamine | Gln | Q |- | Asparagine | Asn | N |} | ||
{| width="200" border="1" cellpadding="1" cellspacing="1" | |||
|+ '''Polar amino acids''' | |||
|- | |||
| Serine | |||
| Ser | |||
| S | |||
|- | |||
| Cysteine | |||
| Cys | |||
| C | |||
|- | |||
| Threonine | |||
| Thr | |||
| T | |||
|- | |||
| Glutamine | |||
| Gln | |||
| Q | |||
|- | |||
| Asparagine | |||
| Asn | |||
| N | |||
|} | |||
Revision as of 18:51, 27 November 2010
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 aspargaine 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]
{| width="200" border="1" cellpadding="1" cellspacing="1" |+ Polar amino acids |- | Serine | Ser | S |- | Cysteine | Cys | C |- | Threonine | Thr | T |- | Glutamine | Gln | Q |- | Asparagine | Asn | N |}
- ↑ Berg J., Tymoczko J and Stryer L, (2007) Biochemisty, 6th edition, New York: WH freeman.