Tirosina

Tirosina
Formula rangka isomer-L
Formula rangka L-tirosina

L-Tirosina dalam pH fisiologi
Model bola dan batang[1]
Model ruangan[1]
Nama
Nama IUPAC
(S)-Tirosina
Nama lain
Asid L-2-amino-3-(4-hidroksifenil)propanoik
Pengecam
Imej model 3D Jmol
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.000.419
KEGG
UNII
  • InChI=1S/C9H11NO3/c10-8(9(12)13)5-6-1-3-7(11)4-2-6/h1-4,8,11H,5,10H2,(H,12,13)/t8-/m0/s1 ☑Y
    Key: OUYCCCASQSFEME-QMMMGPOBSA-N ☑Y
  • Key: OUYCCCASQSFEME-UHFFFAOYSA-N
  • Key: OUYCCCASQSFEME-MRVPVSSYSA-N
  • N[C@@H](Cc1ccc(O)cc1)C(O)=O
  • Zwiterion: [NH3+][C@@H](Cc1ccc(O)cc1)C([O-])=O
Sifat
C9H11NO3
Jisim molar 181.19 g·mol−1
.0453 g/100 mL
-105.3·10−6 cm3/mol
Bahaya
NFPA 704 (berlian api)
NFPA 704 berlian 4 warnaKemudahbakaran kod 1: Mesti dipanaskan dahulu sebelum pencucuhan boleh berlaku. Takat kilat lebih 93°C (200°F). Cth, minyak canolaKesihatan kod 1: Pendedahan akan menyebabkan kerengsaan tetapi hanya kecederaan sisa kecil. Cth, turpentinKereaktifan kod 0: Biasanya stabil, walaupun di bawah keadaan pendedahan api, dan tidak reaktif dengan air. Cth, nitrogen cecairBahaya khas (putih): tiada kod
1
1
0
Kecuali jika dinyatakan sebaliknya, data diberikan untuk bahan-bahan dalam keadaan piawainya (pada 25 °C [77 °F], 100 kPa).
Rujukan kotak info

L-Tirosina atau tirosina (simbol Tyr atau Y)[2] atau 4-hidroksifenilalanina ialah sejenis asid amino yang digunakan untuk menghasilkan protein. Ia merupakan satu asid amino tak perlu, dengan rantai sisi berkutub. Mamalia menghasilkan tirosina daripada fenilalanina yang diperoleh daripada nutrisi, dengan mangkin berupa enzim fenilalanina hidroksilase.

Perkataan "tirosina" berasal daripada perkataan Yunani bagi keju (tyrós), dan ditemui pada 1846 oleh ahli kimia Jerman Justus von Liebig dalam protein kasein dari keju.[3][4] Walaupun tirosin secara amnya dikelaskan sebagai asid amino hidrofobik, ia lebih hidrofilik daripada fenilalanina.[5]

Rujukan

  1. ^ a b Frey MN, Koetzle TF, Lehmann MS, Hamilton WC (1973). "Precision neutron diffraction structure determination of protein and nucleic acid components. X. A comparison between the crystal and molecular structures of L‐tyrosine and L‐tyrosine hydrochloride". J. Chem. Phys. 58 (6): 2547–2556. Bibcode:1973JChPh..58.2547F. doi:10.1063/1.1679537.
  2. ^ "Nomenclature and Symbolism for Amino Acids and Peptides". IUPAC-IUB Joint Commission on Biochemical Nomenclature. 1983. Diarkibkan daripada yang asal pada 9 October 2008. Dicapai pada 5 March 2018.
  3. ^ "Tyrosine". The Columbia Electronic Encyclopedia, 6th ed. Infoplease.com — Columbia University Press. 2007. Dicapai pada 2008-04-20.
  4. ^ Harper D (2001). "Tyrosine". Online Etymology Dictionary. Dicapai pada 2008-04-20.
  5. ^ "Amino Acids - Tyrosine". www.biology.arizona.edu. Dicapai pada 2018-01-31.

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