Characterization of rat and human CYP2J enzymes as Vitamin D 25-hydroxylases

Isamu Aiba, Tomoaki Yamasaki, Toshimasa Shinki, Shunsuke Izumi, Keiko Yamamoto, Sachiko Yamada, Hiroaki Terato, Hiroshi Ide, Yoshihiko Ohyama

Research output: Contribution to journalArticle

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Abstract

vitamin D is 25-hydroxylated in the liver, before being activated by 1α-hydroxylation in the kidney. Recently, the rat cytochrome P450 2J3 (CYP2J3) has been identified as a principal vitamin D 25-hydroxylase in the rat [Yamasaki T, Izumi S, Ide H, Ohyama Y. Identification of a novel rat microsomal vitamin D3 25-hydroxylase. J Biol Chem 2004;279(22):22848-56]. In this study, we examine whether human CYP2J2 that exhibits 73% amino acid homology to rat CYP2J3 has similar catalytic properties. Recombinant human CYP2J2 was overexpressed in Escherichia coli, purified, and assayed for vitamin D 25-hydroxylation activity. We found significant 25-hydroxylation activity toward vitamin D3 (turnover number, 0.087 min-1), vitamin D2 (0.16 min-1), and 1α-hydroxyvitamin D3 (2.2 min-1). Interestingly, human CYP2J2 hydroxylated vitamin D2, an exogenous vitamin D, at a higher rate than it did vitamin D3, an endogenous vitamin D, whereas, rat CYP2J3 hydroxylated vitamin D3 (1.4 min-1) more efficiently than vitamin D2 (0.86 min-1). Our study demonstrated that human CYP2J2 exhibits 25-hydroxylation activity as well as rat CYP2J3, although the activity of human CYP2J2 is weaker than rat CYP2J3. CYP2J2 and CYP2J3 exhibit distinct preferences toward vitamin D3 and D2.

Original languageEnglish
Pages (from-to)849-856
Number of pages8
JournalSteroids
Volume71
Issue number10
DOIs
Publication statusPublished - Oct 1 2006
Externally publishedYes

Fingerprint

Mixed Function Oxygenases
Vitamin D
Rats
Cytochrome P-450 Enzyme System
Ergocalciferols
Hydroxylation
Cholecalciferol
Enzymes
Cholestanetriol 26-Monooxygenase
Thermodynamic properties
Human Activities
Liver
Escherichia coli
arachidonate epoxygenase
Kidney
Amino Acids

Keywords

  • 25-Hydroxylase
  • CYP2J2
  • CYP2J3
  • vitamin D
  • vitamin D

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Molecular Biology

Cite this

Aiba, I., Yamasaki, T., Shinki, T., Izumi, S., Yamamoto, K., Yamada, S., ... Ohyama, Y. (2006). Characterization of rat and human CYP2J enzymes as Vitamin D 25-hydroxylases. Steroids, 71(10), 849-856. https://doi.org/10.1016/j.steroids.2006.04.009

Characterization of rat and human CYP2J enzymes as Vitamin D 25-hydroxylases. / Aiba, Isamu; Yamasaki, Tomoaki; Shinki, Toshimasa; Izumi, Shunsuke; Yamamoto, Keiko; Yamada, Sachiko; Terato, Hiroaki; Ide, Hiroshi; Ohyama, Yoshihiko.

In: Steroids, Vol. 71, No. 10, 01.10.2006, p. 849-856.

Research output: Contribution to journalArticle

Aiba, I, Yamasaki, T, Shinki, T, Izumi, S, Yamamoto, K, Yamada, S, Terato, H, Ide, H & Ohyama, Y 2006, 'Characterization of rat and human CYP2J enzymes as Vitamin D 25-hydroxylases', Steroids, vol. 71, no. 10, pp. 849-856. https://doi.org/10.1016/j.steroids.2006.04.009
Aiba I, Yamasaki T, Shinki T, Izumi S, Yamamoto K, Yamada S et al. Characterization of rat and human CYP2J enzymes as Vitamin D 25-hydroxylases. Steroids. 2006 Oct 1;71(10):849-856. https://doi.org/10.1016/j.steroids.2006.04.009
Aiba, Isamu ; Yamasaki, Tomoaki ; Shinki, Toshimasa ; Izumi, Shunsuke ; Yamamoto, Keiko ; Yamada, Sachiko ; Terato, Hiroaki ; Ide, Hiroshi ; Ohyama, Yoshihiko. / Characterization of rat and human CYP2J enzymes as Vitamin D 25-hydroxylases. In: Steroids. 2006 ; Vol. 71, No. 10. pp. 849-856.
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abstract = "vitamin D is 25-hydroxylated in the liver, before being activated by 1α-hydroxylation in the kidney. Recently, the rat cytochrome P450 2J3 (CYP2J3) has been identified as a principal vitamin D 25-hydroxylase in the rat [Yamasaki T, Izumi S, Ide H, Ohyama Y. Identification of a novel rat microsomal vitamin D3 25-hydroxylase. J Biol Chem 2004;279(22):22848-56]. In this study, we examine whether human CYP2J2 that exhibits 73{\%} amino acid homology to rat CYP2J3 has similar catalytic properties. Recombinant human CYP2J2 was overexpressed in Escherichia coli, purified, and assayed for vitamin D 25-hydroxylation activity. We found significant 25-hydroxylation activity toward vitamin D3 (turnover number, 0.087 min-1), vitamin D2 (0.16 min-1), and 1α-hydroxyvitamin D3 (2.2 min-1). Interestingly, human CYP2J2 hydroxylated vitamin D2, an exogenous vitamin D, at a higher rate than it did vitamin D3, an endogenous vitamin D, whereas, rat CYP2J3 hydroxylated vitamin D3 (1.4 min-1) more efficiently than vitamin D2 (0.86 min-1). Our study demonstrated that human CYP2J2 exhibits 25-hydroxylation activity as well as rat CYP2J3, although the activity of human CYP2J2 is weaker than rat CYP2J3. CYP2J2 and CYP2J3 exhibit distinct preferences toward vitamin D3 and D2.",
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