半胱氨酸 Cysteine
（重定向自Cystein）
![](/Images/godic/202501/07/Cystein_-_Cysteine.svg5458.png")
.svg5458.png")
![](/Images/godic/202501/07/L-Cystein_-_L-Cysteine.svg5458.png")
![Cysteine synthesis. Cystathionine beta synthase catalyzes the upper reaction and cystathionine gamma-lyase catalyzes the lower reaction.](/Images/godic/202501/07/Cysteine_biosynthesis.svg5458.png")
半胱氨酸（cysteine）属于20种天然氨基酸之一，是一种含硫（与甲硫氨酸一样）的非必需氨基酸。动物体内可经由蛋氨酸和丝氨酸合成。有缓解修复放射线对人体的损伤作用。在人体内还有范围广泛的解毒作用，是丙烯腈及芳香族酸中毒的治疗用药。
有助于戒除酒瘾，为脑部及肝脏作用时所需；对肝脏细胞的新生而言是必需品。
Cystein
中文百科
英语百科
Cysteine 半胱氨酸
（重定向自Cystein）
![Figure 2: Cystine (shown here in its neutral form), two cysteines bound together by a disulfide bond.](/Images/godic/202501/07/Cystine-skeletal5458.png")
![](/Images/godic/202501/07/L-amino_acid_any5458.png")
Cysteine (abbreviated as Cys or C) is a semi-essential proteinogenic amino acid with the formula HO2CCH(NH2)CH2SH>. It is encoded by the codons UGU and UGC. The thiol side chain in cysteine often participates in enzymatic reactions, 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.
- transflow
- transfluence
- transfluent
- transfluorescence
- Transfluthrin
- transfluvial
- transflux core storage
- transflux
- transfluxor
- transfluxor magnetic core
- transfluxor memory
- transfluxor memory element
- transfluxor storage
- TRANSFLUXORS used for static stores
- TRANSFLUXORS used for switching pulses
- TRANSFLUXORS used in static code converters
- transfluxor switch
- Transfolk
- transfomation
- transforamen magna herniation
- transforaminal
- transforate
- transforation
- transforator
- transfor factor