Cysteine: Difference between revisions

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Cysteine (abbreviated to Cys or C) is an amino acid with the side chain -CH<sub>2</sub>SH.&nbsp; Cysteine, like [[Methionine|methionine]], contains sulphur. It is a non-polar [[Amino acids|amino acid that]] contains a very reactive&nbsp;thiol or sulfhydryl group (-SH). The presence of this group&nbsp;allows cysteine to&nbsp;form strong [[Disulphide bridges|disulphide bridges]]&nbsp;when paired with&nbsp;another cysteine. Cysteine therfore plays an important structural role in proteins.&nbsp;The ability of cysteine to form disulphide bridges is of great significance for proteins that have to work outside of the cell.&nbsp;This is because the cysteine side chain of these proteins&nbsp;forms disulphide bonds&nbsp;which&nbsp;increases the stability of the proteins.&nbsp;However, it&nbsp;should be noted that proteins working inside the cell do not form disulphide bonds. Like histidine, cysteine has binding site for metal ions in proteins.<ref>Berg et al., Biochemistry, 6th Edition, 2007: 31.</ref>.&nbsp;<br>
Cysteine (abbreviated to Cys or C) is an amino acid with the side chain -CH<sub>2</sub>-<sub></sub>SH.&nbsp; Cysteine, like [[Methionine|methionine]], contains sulphur. It is a non-polar [[Amino acids|amino acid]]&nbsp;contains a very reactive&nbsp;thiol or sulfhydryl group (-SH). The presence of this group&nbsp;allows cysteine to&nbsp;form strong [[Disulphide bridges|disulphide bridges]]&nbsp;when paired with&nbsp;another cysteine. Cysteine therfore plays an important structural role in [[Protein|proteins]].&nbsp;The ability of cysteine to form disulphide bridges is of great significance for proteins that have to work outside of the [[Cell|cell]].&nbsp;This is because the cysteine side chain of these proteins&nbsp;forms disulphide bonds&nbsp;which&nbsp;increases the stability of the proteins.&nbsp;However, it&nbsp;should be noted that proteins working inside the cell do not form disulphide bonds. Like [[Histidine|histidine]], cysteine has binding site for metal [[Ions|ions]] in proteins.<ref>Berg et al., Biochemistry, 6th Edition, 2007: 31.</ref>.&nbsp;<br>  


=== '''References'''  ===
=== '''References'''  ===


<references />
<references />

Revision as of 19:38, 7 December 2011

Cysteine (abbreviated to Cys or C) is an amino acid with the side chain -CH2-SH.  Cysteine, like methionine, contains sulphur. It is a non-polar amino acid contains a very reactive thiol or sulfhydryl group (-SH). The presence of this group allows cysteine to form strong disulphide bridges when paired with another cysteine. Cysteine therfore plays an important structural role in proteins. The ability of cysteine to form disulphide bridges is of great significance for proteins that have to work outside of the cell. This is because the cysteine side chain of these proteins forms disulphide bonds which increases the stability of the proteins. However, it should be noted that proteins working inside the cell do not form disulphide bonds. Like histidine, cysteine has binding site for metal ions in proteins.[1]. 

References

  1. ↑ Berg et al., Biochemistry, 6th Edition, 2007: 31.
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