ja %E3%82%BF%E3%82%A6%E3%83%AD%E3%82%B1%E3%83%8E%E3%83%87%E3%82%AA%E3%82%AD%E3%82%B7%E3%82%B3%E3%83%BC%E3%83%AB%E9%85%B8-6%CE%B1-%E3%83%92%E3%83%89%E3%83%AD%E3%82%AD%E3%82%B7%E3%83%A9%E3%83%BC%E3%82%BC

タウロケノデオキシコール酸-6α-ヒドロキシラーゼ（taurochenodeoxycholate 6α-hydroxylase）は、次の化学反応を触媒する酸化還元酵素である。

(1) タウロケノデオキシコール酸 + NADPH + H⁺ + O₂ $\rightleftharpoons$ タウロヒオコール酸 + NADP⁺ + H₂O
(2) リトコール酸 + NADPH + H⁺ + O₂ $\rightleftharpoons$ ヒオデオキシコール酸 + NADP⁺ + H₂O

組織名はtaurochenodeoxycholate,NADPH:oxygen oxidoreductas (6α-hydroxylating)で、別名にCYP3A4、CYP4A21、taurochenodeoxycholate 6α-monooxygenaseがある。

参考文献

Araya, Z. and Wikvall, K. (1999). “6α-Hydroxylation of taurochenodeoxycholic acid and lithocholic acid by CYP3A4 in human liver microsomes.”. Biochim. Biophys. Acta 1438: 47-54. PMID 10216279.
Araya, Z., Hellman, U. and Hansson, R. (1995). “Characterisation of taurochenodeoxycholic acid 6α-hydroxylase from pig liver microsomes.”. Eur. J. Biochem. 231: 855-861. PMID 7649186.
Kramer, W., Sauber, K., Baringhaus, K.H., Kurz, M., Stengelin, S., Lange, G., Corsiero, D., Girbig, F., Konig, W. and Weyland, C. (2001). “Identification of the bile acid-binding site of the ileal lipid-binding protein by photoaffinity labeling, matrix-assisted laser desorption ionization-mass spectrometry, and NMR structure.”. J. Biol. Chem. 276: 7291-7301. PMID 11069906.
Lundell, K., Hansson, R. and Wikvall, K. (2001). “Cloning and expression of a pig liver taurochenodeoxycholic acid 6α-hydroxylase (CYP4A21): a novel member of the CYP4A subfamily.”. J. Biol. Chem. 276: 9606-9612. PMID 11113117.
Lundell, K. and Wikvall, K. (2003). “Gene structure of pig sterol 12α-hydroxylase (CYP8B1) and expression in fetal liver: comparison with expression of taurochenodeoxycholic acid 6α-hydroxylase (CYP4A21).”. Biochim. Biophys. Acta 1634: 86-96. PMID 14643796.
Russell, D.W. (2003). “The enzymes, regulation, and genetics of bile acid synthesis.”. Annu. Rev. Biochem. 72: 137-174. PMID 12543708.