L-Cysteine（CAS# 52-90-4)
| Nā hōʻailona pōʻino | Xn – Poino |
| Nā Code Risk | R22 – Poino ke aleia R36/37/38 – Hoʻonanea i ka maka, ka ʻōpū hanu a me ka ʻili. |
| Ka wehewehe palekana | S26 – Inā pili me nā maka, e holoi koke me ka wai nui a e ʻimi i ka ʻōlelo aʻo kino. S37/39 – E hoʻohana i nā mīkina lima kūpono a me ka pale maka/maka |
Hoʻolauna
ʻO ka L-cysteine (L-Cysteine ) he waikawa amino pono ʻole, i hoʻopaʻa ʻia e nā codons UGU a me UGC, a he sulfhydryl-containing amino acid. Ma muli o ka loaʻa ʻana o nā pūʻulu sulfhydryl, liʻiliʻi kona ʻona, a ma ke ʻano he antioxidant, hiki iā ia ke pale i ka hana o nā radical manuahi. & & L-cysteine he ʻakika amino pono ʻole. He mea hoʻoikaika ia o NMDA. He nui nō hoʻi kāna hana ma ka moʻomeheu cell, penei: 1. Protein synthesis substrate; ʻO ka pūʻulu sulfhydryl i ka cysteine he hana koʻikoʻi i ka hoʻokumu ʻana i nā mea paʻa disulfide, a ʻo ia hoʻi ke kuleana no ka hoʻopili ʻana o nā protein, ka hanauna o nā hale kiʻekiʻe a me ke kula kiʻekiʻe. 2. Acetyl-CoA synthesis; 3. pale i nā pūnaewele mai ke kaumaha oxidative; 4. ʻo ia ke kumu nui o ka sulfur ma ka moʻomeheu cell; 5. Metala ionophore. & & Nā hana olaola: ʻO ka Cysteine kahi ʻakika α-amino polar i loaʻa nā pūʻulu sulfhydryl i ka pūʻulu aliphatic. ʻO ka Cysteine kahi amino acid koʻikoʻi a me ka waikawa amino saccharogenic no ke kino kanaka. Hiki ke hoʻololi ʻia mai ka methionine (methionine, he waikawa amino pono no ke kino o ke kanaka) a hiki ke hoʻololi ʻia i cystine. Hoʻopau ʻia ka decomposition o ka cysteine i pyruvate, hydrogen sulfide a me ammonia ma o ka hana desulphurase ma lalo o nā kūlana anaerobic, a i ʻole ma o ka transamination, ua decomposed ka huahana waena β-mercaptopyruvate i pyruvate a me ka sulfur. Ma lalo o nā kūlana oxidation, ma hope o ka oxidized i ka cysteine sulfurous acid, hiki ke decomposed i ka pyruvate a me ka sulfurous acid e ka transamination, a decomposed i taurine a me taurine e ka decarboxylation. Eia kekahi, ʻo ka cysteine kahi pūhui paʻa ʻole, maʻalahi redox, a interconverts me ka cystine. Hiki ke hoʻopaʻa ʻia me nā pūhui ʻala ʻona e synthesize i ka waika mercapturic e detoxify. ʻO Cysteine he mea hoʻohaʻahaʻa, hiki ke hoʻoikaika i ka hoʻokumu ʻana o ka gluten, hoʻemi i ka manawa e pono ai no ka hui ʻana a me ka ikehu e pono ai no ka hoʻohana lāʻau. Hoʻonāwaliwali ʻo Cysteine i ke ʻano o ka protein ma o ka hoʻololi ʻana i nā paʻa disulfide ma waena o nā molekele protein a i loko o nā molekole protein, i ʻō aku ka protein.
