Cystein
| Cystein | |
|---|---|
| |
| Generelt | |
| Systematisk navn | 2-Amino-3-sulfhydrylpropansyre |
| Molekylformel | HO2CCH(NH2)CH2SH |
| Molmasse | 121,16 g/mol |
| Hvis ikke andet er angivet, er data givet for stoffer i standardtilstanden (ved 25 °C, 100 kPa) | |
Cystein (også Cys eller C)[1] er en α-aminosyre med formlen HO2CCH(NH2)CH2SH. Den er ikke blandt de essentielle aminosyrer, hvilket betyder at den kan blive biosyntetiseret i mennesker.[2] Den genetiske kode er UGU og UGC. Thiol-sidekæden i cystein deltager i enzymatiske reaktioner, hvor den fungerer som nukleofil. Thiolen kan oxideres og giver disulfid-derivatet cystin, som er et vigtig strukturelt molekyle i mange proteiner. Når det benyttes i mad har det E-nummeret E920.
Referencer
- ^ IUPAC-IUBMB Joint Commission on Biochemical Nomenclature. "Nomenclature and Symbolism for Amino Acids and Peptides". Recommendations on Organic & Biochemical Nomenclature, Symbols & Terminology etc. Arkiveret fra originalen 29. maj 2007. Hentet 2007-05-17.
- ^ "The primary structure of proteins is the amino acid sequence". The Microbial World. University of Wisconsin-Madison Bacteriology Department. Arkiveret fra originalen 25. maj 2013. Hentet 16. september 2012.
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Index:
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