Qhov txawv ntawm cysteine thiab serine yog tias cysteine yog sulfur-muaj amino acid thaum serine tsis yog sulfur-muaj amino acid.
Y Cysteine thiab serine yog proteinogenic amino acids, txhais tau tias cov amino acids yog cov khoom tseem ceeb hauv cov proteins. Cysteine thiab serine cov qauv tshuaj sib txawv ntawm ib leeg raws li ib qho atom uas cysteine muaj cov pa atom hauv pawg -OH thaum serine muaj cov sulfur atom es tsis yog cov pa atom.
YCysteine yog dab tsi?
Cysteine yog ib qho amino acid uas yog ib qho tseem ceeb rau peb lub cev, thiab nws muaj cov tshuaj formula HOOC-CH-(NH2)-CH 2SH. Nws yog ib hom proteinogenic amino acid. Nws muaj thiol sab saw uas feem ntau koom nrog cov tshuaj tiv thaiv enzymatic hauv daim ntawv ntawm nucleophile. Cov thiol pawg no raug oxidation, tsim cov disulfide derivative ntawm cysteine molecule. Qhov no disulfide derivative plays lub luag haujlwm tseem ceeb hauv ntau cov proteins ua cov khoom siv. Ntxiv mus, cysteine muaj txiaj ntsig zoo li cov khoom noj ntxiv (tus lej E yog E920).
Daim duab 01: Cov Qauv Tshuaj ntawm Cysteine Molecule
Thaum cais tawm, cysteine tshwm li cov muaju dawb lossis hmoov uas yog dej-soluble. Zoo ib yam li feem ntau lwm cov amino acids, cysteine kuj tshwm sim raws li zwitterion. Ntxiv mus, qhov sib xyaw no qhia txog chirality qhov twg L-cysteine ntau dua li D isomer.
Peb tuaj yeem pom cov cysteine thiab nws cov derivatives hauv cov zaub mov. Piv txwv li, cysteyl tuaj yeem pom hauv cov khoom noj muaj protein ntau. Txawm hais tias peb lub npe nws yog ib qho tseem ceeb ntawm cov amino acid, nws yog ib qho tseem ceeb rau cov me nyuam mos, cov neeg laus, thiab cov neeg muaj qee yam kab mob metabolic. Yog tias muaj cov methionine txaus nyob rau hauv lub cev, lub cev tuaj yeem ua kom txaus cysteine los ntawm nws tus kheej. Qee qhov kev ua haujlwm lom neeg ntawm cysteine suav nrog kev ua yeeb yam ua ntej rau cov tshuaj tiv thaiv kab mob antioxidant glutathione, ua tus thawj coj rau pawg hlau-sulfur, hauv cov hlau ion khi, lub luag haujlwm hauv cov qauv protein, thiab lwm yam.
Serine yog dab tsi?
YSerine yog ib qho alpha-amino acid uas muaj cov tshuaj formula C3H7NO3. Nws yog ib qho tseem ceeb hauv biosynthesis ntawm cov protein. Cov tshuaj no muaj ib pawg alpha-amino thiab ib sab saw uas muaj cov pab pawg hydroxymethyl. Cov pab pawg sab no ua rau cov amino acid polar amino acid. Nws raug suav hais tias yog ib qho tsis tseem ceeb amino acid vim tias lub cev tuaj yeem ua rau nws nquag. Cov codons uas tuaj yeem encode cov amino acid no suav nrog UCU, UCC, UCA, UCG, AGU, thiab AGC.
Serine yog ib txwm tshwm sim proteinogenic amino acid. Txawm li cas los xij, L isomer ntawm serine yog hom ntau tshaj plaws. Glycine thiab lwm yam metabolites tuaj yeem tsim cov amino acid no hauv lub cev; Yog li ntawd, nws tsis yog qhov tseem ceeb uas yuav tsum tau noj serine los ntawm sab nraud. Thaum sib cais, serine tshwm li cov muaju dawb los yog hmoov dawb.
Daim duab 02: Txoj Kev Tsim Kho Kev Lag Luam rau Serine
Muaj ntau ntau yam tseem ceeb hauv kev ua haujlwm ntawm serine, uas suav nrog kev siv serine hauv cov metabolism hauv purines thiab pyrimidines, catalytic muaj nuj nqi hauv ntau cov enzymes, raws li cov khoom siv hauv cov protein, ua cov cim qhia, gustatory sensation, thiab lwm yam.
Qhov txawv ntawm Cysteine thiab Serine yog dab tsi?
Y Cysteine thiab serine yog proteinogenic amino acids. Qhov sib txawv tseem ceeb ntawm cysteine thiab serine yog tias cysteine yog ib qho sulfur-muaj amino acid thaum serine tsis yog sulfur-muaj amino acid. Tsis tas li, lawv muaj cov qauv tshuaj sib txawv me ntsis qhov twg muaj -OH pawg hauv cysteine nyob rau hauv qhov chaw ntawm -SH pawg hauv serine.
Cov lus qhia hauv qab no qhia qhov sib txawv ntawm cysteine thiab serine hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Cysteine vs Serine
Y Cysteine thiab serine yog proteinogenic amino acids, txhais tau tias cov amino acids yog cov khoom tseem ceeb hauv cov proteins. Qhov sib txawv tseem ceeb ntawm cysteine thiab serine yog tias cysteine yog ib qho sulfur-muaj amino acid thaum serine tsis yog sulfur-muaj amino acid.
