半胱氨酸

半胱氨酸
	IUPAC名; Cysteine ; 2-Amino-3-mercaptopropanoic acid ; 2-氨基-3-巯基丙酸
缩写
识别
CAS号	52-90-4 ; 52-89-1（(hydrochloride)）
PubChem	5862
ChemSpider	574 (Racemic), 5653 (L-form)
SMILES	C([C@@H](C(=O)O)N)S;
InChI	1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1;
InChIKey	XUJNEKJLAYXESH-REOHCLBHBU
ChEBI	15356
KEGG	D00026
IUPHAR配体	4782
性质
化学式	C3H7NO2S
	121.16 g·mol⁻¹
熔点	220 ~ 228 ℃
沸点	240 ℃（分解）
	若非注明，所有数据均出自标准状态（25 ℃，100 kPa）下。

半胱氨酸（Cysteine，可简写为Cys或C）[1]是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。动物体内可经由甲硫胺酸和丝氨酸合成。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。

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Quick facts: 半胱氨酸, 识别, 性质... ▼

半胱氨酸有助于戒除酒瘾，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。半胱氨酸根据研究，可提升肾上腺素，可能引起某些人失眠。