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Sistéina atawa sistéin (lambang Cys atawa C;[3] /ˈsɪstɪiːn/)[4] nyaéta asam amino protéinogenik semiésénsial[5] anu rumusna HOOC-CH-(NH2)-CH2-SH. Ranté gigir tiol dina sistéin osok kapaké dina réaksi énzimatik salaku nukléopil.
![]() Rumus rangka L-sistéin | |||
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Wasta | |||
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Wasta IUPAC
Cysteine | |||
Wasta lian
Asam 2-amino-3-sulphidrilpropanoat | |||
Pananda | |||
Nomer CAS |
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Modél 3D (JSmol) |
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Abbreviations | Cys, C | ||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
ECHA InfoCard | 100.000.145 | ||
Nomer EC | 200-158-2 | ||
Nomer E | E920 (palapis, ...) | ||
IUPHAR/BPS |
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KEGG | |||
PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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InChI
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SMILES
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Sipat[1] | |||
Rumus kimia |
C3H7NO2S | ||
Massa molar | 12115 g·mol−1 | ||
Panampilan | tipung atawa kristal bodas | ||
Titik lebur | 240 °C (464 °F; 513 K) decomposes | ||
Kelarutan dina cai |
soluble | ||
Solubilitas | 1.5g/100g étanol 19 degC [2] | ||
Rotasi kiral ([α]D) |
+9.4° (H2O, c = 1.3) | ||
Iwal disebutkeun séjén, data nu dipidangkeun keur matéri dina kaayaan baku (dina 25 °C, 100 kPa). | |||
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Rujukan kotak info | |||
Nalika aya salaku résidu katalitik deprotonasi, kadang simbol Cyz dipaké.[6][7] Wangun deprotonasi umumna bisa maké simbol Cym ogé.[8] Ieu tiol babari kaoksidasi jadi turunan disulpida sistin, anu boga pancén struktural penting dina protéin. Dina ieu kasus, simbol Cyx kadang dipaké.[8] Nalika dipaké aditip dahareun, nomer E-na E920.
Sistéin dikode ku kodon UGU jeung UGC.
Sistéin jeung métionin anu ngandung walirang leuwih babari kaoksidasi batan asam amino lianna.[9][10]
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Wikimedia Commons mibanda média séjénna nu patali jeung Cysteine . |
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