Qhov sib txawv tseem ceeb ntawm cysteine thiab cystine yog tias cysteine yog ib qho amino acid thaum cystine tsim thaum ob amino acids koom ua ke ntawm ib daim ntawv cog lus disulfide.
Ib qho amino acid yog ib qho yooj yim molecule tsim nrog C, H, O, N thiab tej zaum S. Muaj txog 20 hom amino acids. Tag nrho cov amino acids muaj -COOH, -NH2 pawg thiab -H sib txuas rau carbon. Cov pa roj carbon monoxide yog chiral carbon, thiab alpha-amino acids yog qhov tseem ceeb tshaj plaws hauv lub ntiaj teb lom neeg. Tsis tas li ntawd, cov amino acids yog lub tsev blocks ntawm cov proteins. Thaum ob amino acids koom ua ib lub dipeptide, kev sib xyaw ua ke yuav tshwm sim hauv ib pawg -NH2 pawg ntawm ib cov amino acid nrog -COOH pawg ntawm lwm cov amino acid. Ib qho dej molecule raug tshem tawm, thiab daim ntawv cog lus tsim yog "peptide bond".
YCysteine yog dab tsi?
YCysteine yog ib qho alpha-amino acid. R pawg cysteine yog -CH
2SH, uas muaj leej faj. Cov qauv ntawm cysteine yog muab hauv qab no.
Daim duab 01: Cov qauv ntawm Cysteine molecule
Peb tuaj yeem sau nws ua Cys. thiol pawg (-SH) ntawm cysteine ua rau cov compound ntau polar. Yog li ntawd, cov amino acid no soluble nyob rau hauv dej. Ntxiv mus, pawg thiol koom nrog hydrogen bonding nrog dej molecules. Peb tuaj yeem tsim cov cysteine hauv peb lub cev, yog li nws yog ib qho tseem ceeb ntawm cov amino acid. Txawm li cas los xij, qee zaum nws yuav tsum tau txais cysteine los ntawm cov khoom noj uas muaj protein ntau. Nqaij qaib, qe, mis nyuj, yogurt, oats, thiab broccoli yog qee qhov chaw uas muaj qib siab ntawm cov amino acid no.
Cysteine amino acid yog qhov tseem ceeb hauv cov kab mob lom neeg vim nws yog ib qho amino acid uas peb tuaj yeem pom hauv cov chaw ua haujlwm ntawm cov enzymes. pawg thiol yog nucleophilic; Yog li ntawd, lawv koom nrog ntau cov tshuaj tiv thaiv enzymatic. Cov disulfide bonds ntawm pawg thiol yog qhov tseem ceeb rau kev sib tw ntawm cov protein thiab hauv kev txiav txim siab peb-dimensional qauv ntawm cov proteins.
Cystine yog dab tsi?
Thaum ob cysteine amino acid residues tsim ib daim ntawv cog lus disulfide, qhov tshwm sim dimeric residue hu ua cystine. Nws yog nyob rau hauv daim ntawv khov thiab yog xim dawb. Cov qauv ntawm no molecule yog raws li nram no:
Daim duab 02: Tus qauv ntawm Cystine
Tsis tas li ntawd, peb tuaj yeem pom cov cystine residues hauv cov proteins, thiab lawv pab ua kom lub cev peb sab ntawm cov protein.
Qhov txawv ntawm Cysteine thiab Cystine yog dab tsi?
Ob lo lus Cysteine thiab cystine feem ntau tsis meej pem vim tias cov ntawv sau ntawm ob nqe lus thiab cov lus hais zoo ib yam. Txawm li cas los xij, qhov sib txawv tseem ceeb ntawm cysteine thiab cystine yog tias cysteine yog ib qho amino acid, thaum lub cystine tsim thaum ob amino acids koom ua ke ntawm disulfide daim ntawv cog lus. Thaum xav txog qhov tseem ceeb ntawm ob lub tebchaw, Cysteine yog qhov tseem ceeb rau kev tsim cov protein, detoxification thiab ntau lwm yam kev ua haujlwm hauv metabolic thaum cystine yog qhov tseem ceeb los ua kom cov qauv tertiary ntawm cov protein. Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm cysteine thiab cystine.
Summary – Cysteine vs cysteine
Cysteine thiab cystine yog cov khoom tseem ceeb hauv peb lub cev. Hauv cov ntsiab lus, qhov sib txawv tseem ceeb ntawm cysteine thiab cystine yog tias cysteine yog ib qho amino acid, thaum lub cystine tsim thaum ob amino acids koom ua ke ntawm ib daim ntawv cog lus disulfide.
