| CAS No.: | 52-90-4 |
|---|---|
| Formula: | C3h7no2s |
| EINECS: | 200-158-2 |
| Type: | Pharmaceutical Intermediates |
| Appearance: | Powder |
| Quality: | Technical |
| Customization: |
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Audited Supplier Product Name: L-Cysteine
Synonyms: (R)-2-Amino-3-mercaptopropanoic acid;3-mercapto-l-alanin;alpha-amino-beta-mercaptopropionicacid;alpha-Amino-beta-thiolpropionic acid;alpha-amino-beta-thiolpropionicacid;Cystein;half-cysteine;L-Cysteine - animal origin
CAS: 52-90-4
MF: C3H7NO2S
MW: 121.16
EINECS: 200-158-2
Melting point: 240 °C (dec.) (lit.)
Storage temp.: Store below +30°C
Description:
Cysteine (abbreviated as Cys or C) is an α-amino acid with the chemical formula HO2CCH(NH2)CH2SH. It is a semi - essential amino acid, which means that it can be biosynthesized in humans. The thiol side chain in cysteine often participates in enzymatic reactions, serving as a nucleophile. The thiol is susceptible to oxidization to give the disulfide derivative cystine, which serves an important structural role in many proteins. When used as a food additive, it has the E number E920.
Usage:
The cysteine thiol group is nucleophilic and easily oxidized. The reactivity is enhanced when the thiol is ionized, and cysteine residues in proteins have pKa values close to neutrality, so are often in their reactive thiolate form in the cell. Because of its high reactivity, the thiol group of cysteine has numerous biological functions.
Precursor to the antioxidant glutathione
Due to the ability of thiols to undergo redox reactions, cysteine has antioxidant properties. Cysteine's antioxidant properties are typically expressed in the tripeptide glutathione, which occurs in humans as well as other organisms.
Precursor to iron-sulfur clusters
Cysteine is an important source of sulfide in human metabolism. The sulfide in iron-sulfur clusters and in nitrogenase is extracted from cysteine, which is converted to alanine in the process.
Metal ion binding
Beyond the iron - sulfur proteins, many other metal cofactors in enzymes are bound to the thiolate substituent of cysteinyl residues. Examples include zinc in zinc fingers and alcohol dehydrogenase, copper in the blue copper proteins, iron in cytochrome P450, and nickel in the [NiFe]-hydrogenases . The thiol group also has a high affinity for heavy metals, so that proteins containing cysteine, such as metallothionein, will bind metals.
Roles in protein structure
In the translation of messenger RNA molecules to produce polypeptides, cysteine is coded for by the UGU and UGC codons. Cysteine has traditionally been considered to be a hydrophilic amino acid, based largely on the chemical parallel between its thiol group and the hydroxyl groups in the side-chains of other polar amino acids. However, the cysteine side chain has been shown to stabilize hydrophobic interactions in micelles to a greater degree than the side chain in the non-polar amino acid glycine, and the polar amino acid serine .
1. Rich experience: Our company is a professional production leading factory in China in pharmaceutical area of many years.
2. Top quality: High quality guaranteed, once any problem is found, the package would be reshipped for you .
3. Security Shipping: Shipping by express (FedEx,UPS,DHL,EMS), by air. The most professional forwarder would be recommanded for you.
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6. Competitive prices: A discount would be given when you make a large order.
| Make an order | Please make clear what product and what quantity you need |
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| Lead time | Within 8 hours upon receipt of payment |
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| Shipping time | 3-7 working days (Door-to-Door) |
| After-sale service | 24/7 Online for any problems |
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Hubei Yuanmeng Biological Technology Co., Ltd., which is located in Wuhan, China. We are specializing in the exportation of APIs, and plant extracts ect.
Our products has been exported to America, Australia, Brazil, the Europe, Middle East and other areas in the world. We have established close and stable cooperative relationships with over 200 domestic pharmaceutical and chemical enterprises. With high quality and favorable price, we′ re pleased to get your inquiry and we will reply you as soon as possible.
We will continue to forge ahead and strive hard for excellence, keep on exploring and progressing to develop more high-tech products with superior quality, to satisfy increasing demand of the clients, and create more value for our partners!
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Hubei Yuanmeng Biological Technology Co., Ltd.
Room 3820, Building 2, Vanke Golden City, Hongshan District, Wuhan, Hubei, China
Fiona Wei
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