L-Cysteine
Sign in to savethumb|Cysteine ball and stick model spinning Cysteine (; symbol Cys or C) is a semiessential proteinogenic amino acid with the formula . The thiol side chain in cysteine enables the formation of disulfide bonds, and often participates in enzymatic reactions as a nucleophile. Cysteine is chiral, but both D and L-cysteine are found in nature. LCysteine is a protein monomer in all biota, and D-cysteine acts as a signaling molecule in mammalian nervous systems. Cysteine is named after its discovery in urine, which comes from the urinary bladder or cyst, from Greek κύστις kýstis, "bladder".
AI overview
L-Cysteine is a building block of proteins found in all living organisms that contains a special chemical group called a thiol, which allows it to form important bonds within proteins and participate in chemical reactions inside cells. It matters because these properties make it essential for proper protein structure and function, and it plays roles in nervous system signaling and various enzymatic processes.
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Research
167,161 papers- L-Cysteine: A promising nutritional supplement for alleviating anxiety disorders.Neuroscience · 2024
- Challenges and Advances in the Bioproduction of L-Cysteine.Molecules (Basel, Switzerland) · 2024
- L-Cysteine Metabolism and Fermentation in Microorganisms.Advances in biochemical engineering/biotechnology · 2017
- S-Nitroso-l-cysteine and ventilatory drive: A pediatric perspective.Pediatric pulmonology · 2022
- L-Cysteine metabolism and its nutritional implications.Molecular nutrition & food research · 2016
via PubMed
Article
22 sectionsContents
- Structure
- Dietary sources
- Industrial sources<span class="anchor" id="Dietary restrictions"></span>
- Biosynthesis
- Biological functions
- Precursor to the antioxidant glutathione
- Precursor to iron-sulfur clusters
- Metal ion binding
- Roles in protein structure
- Evolutionary role of cysteine
- Applications
- Reducing toxic effects of alcohol
- ''N''-Acetylcysteine
- D-ribose L-cysteine
- Sheep
- Chemical reactions
- Safety
- History
- See also
- References
- Further reading
- External links
thumb|Cysteine ball and stick model spinning Cysteine (; symbol Cys or C) is a semiessential proteinogenic amino acid with the formula . The thiol side chain in cysteine enables the formation of disulfide bonds, and often participates in enzymatic reactions as a nucleophile. Cysteine is chiral, but both D and L-cysteine are found in nature. LCysteine is a protein monomer in all biota, and D-cysteine acts as a signaling molecule in mammalian nervous systems. Cysteine is named after its discovery in urine, which comes from the urinary bladder or cyst, from Greek κύστις kýstis, "bladder".
The thiol is susceptible to oxidation to give the disulfide derivative cystine, which serves an important structural role in many proteins. In this case, the symbol Cyx is sometimes used. The deprotonated form can generally be described by the symbol Cym as well.
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Alpha-Amino acidsChemical articles having a data pageChemical articles with multiple CAS registry numbersChemical articles with multiple compound IDsECHA InfoCard ID from WikidataE-number additivesE number from WikidataExcitatory amino acidsFood additivesGlucogenic amino acidsMultiple chemicals in an infobox that need indexingProteinogenic amino acids