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en:cystein [2013/06/09 10:10] (current)
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 +======Cystein======
 +Cystein, Cys, C
 +
 +A thiol-containing non-essential amino acid that is oxidized to form [[CYSTINE]].
 +
 +
 +^Name| L-Cystein(((2R)-2-amino-3-sulfanylpropanoic acid)) |
 +^MeSH| [[MeSH>​68003545]] |
 +^CAS No.| 52-89-1 |
 +^Molecular Formula| <​chem>​C3H7NO2S</​chem>​ |
 +^Molecular Weight| 121.159 |
 +^MW (Hydrochloride)|<​chem>​C3H7NO2S HCl</​chem>,​ 157.615|
 +^pK<​sub>​1</​sub>​(25℃)|1.92|
 +^pK<​sub>​2</​sub>​(25℃)|10.78|
 +^pK<​sub>​R</​sub>​(25℃)|8.33|
 +|{{pubchem>​large:​5862}}||
 +
 +\\ \\ 
 +<jmol cys.pdb.gz 250 250></​jmol>​
 +
 +
 +
 +
 +===== Redox reaction =====
 +
 +Some chemicals containing thiol group such as a cyctein and a glutathione are involved in variuos redox reactions in a cell. The reactions proceed in physiological conditions.
 +
 +
 +**Cystein**
 +{{pubchem>​small:​5862}}
 +
 +
 +\\ 
 +\\ 
 +\\ 
 +<- ->
 +
 +
 +**Cystine**
 +{{pubchem>​small:​67678}}
 +
 +
 +
 +======Links======
 +
 +  *[[Amino acid]]
 +  *Sufur-containing amino acid
 +    *[[Methionine]]
 +  *[[pubchem>​5862|Cystein]]
 +  *[[pubchem>​7168037|Fmoc-Cys(Trt)-OH]]
 +
 +
 +{{tag>​en:​Amino_acid en:Jmol}}