L-Cysteine (CAS# 52-90-4)
| Iimpawu ezinobungozi | Xn – Iyingozi |
| Iikhowudi zoMngcipheko | I-R22 – Iyingozi xa iginyiwe R36/37/38 – Ukucaphuka kwamehlo, inkqubo yokuphefumla kunye nolusu. |
| Inkcazelo yoKhuseleko | S26 – Xa udibana namehlo, hlambulula ngokukhawuleza ngamanzi amaninzi kwaye ufune iingcebiso zonyango. I-S37/39 -Nxiba iiglavu ezifanelekileyo kunye nokukhusela amehlo / ubuso |
Intshayelelo
I-L-cysteine (L-Cysteine) i-amino acid engeyomfuneko, efakwe kwi-codons UGU kunye ne-UGC, kwaye i-sulfhydryl-containing amino acid. Ngenxa yobukho bamaqela e-sulfhydryl, ubuthi bayo buncinci, kwaye njenge-antioxidant, inokuthintela ukuveliswa kwee-radicals zamahhala. & & L-cysteine yi-amino acid eyenzeka ngokwemvelo engeyomfuneko. Ungumqalisi we-NMDA. Ikwadlala iindima ezininzi kwinkcubeko yeeseli, ngolu hlobo lulandelayo: 1. I-protein synthesis substrate; Iqela le-sulfhydryl kwi-cysteine idlala indima ebalulekileyo ekubunjweni kweebhondi ze-disulfide, kwaye inoxanduva lokugoqa iiprotheni, ukuveliswa kwezakhiwo zesibini kunye neziphezulu. 2. I-Acetyl-CoA synthesis; 3. khusela iiseli kuxinzelelo lwe-oxidative; 4. ngowona mthombo wesulfure kwinkcubeko yeeseli; 5. Metal ionophore. & & Umsebenzi we-Biological: I-Cysteine yi-polar α-amino acid equkethe amaqela e-sulfhydryl kwiqela le-aliphatic. I-Cysteine yimeko ebalulekileyo ye-amino acid kunye ne-saccharogenic amino acid kumzimba womntu. Iyakwazi ukuguqulwa kwi-methionine (i-methionine, i-amino acid ebalulekileyo kumzimba womntu) kwaye inokuguqulwa ibe yi-cystine. Ukuchithwa kwe-cysteine kuchithwa kwi-pyruvate, i-hydrogen sulfide kunye ne-ammonia ngokusebenzisa isenzo se-desulphurase phantsi kweemeko ze-anaerobic, okanye ngokusebenzisa i-transamination, imveliso ephakathi ye-β-mercaptopyruvate ichithwa kwi-pyruvate kunye nesulfure. Ngaphantsi kweemeko ze-oxidation, emva kokuba i-oxidized kwi-cysteine sulfurous acid, inokuboliswa ibe yi-pyruvate kunye ne-sulfurous acid ngokugqithiswa, kwaye iboliswe ibe yi-taurine kunye ne-taurine nge-decarboxylation. Ukongezelela, i-cysteine yi-compound engazinzile, i-redox ngokulula, kunye ne-interconverts kunye ne-cystine. Isenokuthi ifakwe kwimixube enetyhefu enevumba elimnandi ukwenza iasidi yemercapturic ukuze ikhuphe ityhefu. I-Cysteine yi-arhente yokunciphisa, enokukhuthaza ukubunjwa kwe-gluten, ukunciphisa ixesha elifunekayo lokuxuba kunye namandla afunekayo ekusebenziseni amayeza. I-Cysteine yenza buthathaka isakhiwo seprotheni ngokuguqula i-disulfide bonds phakathi kweemolekyuli zeprotheni kunye nangaphakathi kweemolekyuli zeprotheni, ukuze iprotheni yolule.
