Identification of the amino acid residue of CYP27B1 responsible for binding of 25-hydroxyvitamin D3 whose mutation causes vitamin D-dependent rickets type 1 |
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Authors: | Yamamoto Keiko Uchida Eriko Urushino Naoko Sakaki Toshiyuki Kagawa Norio Sawada Natsumi Kamakura Masaki Kato Shigeaki Inouye Kuniyo Yamada Sachiko |
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Institution: | Institute of Biomaterials and Bioengineering & School of Biomedical Sciences, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan. |
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Abstract: | We previously reported the three-dimensional structure of human CYP27B1 (25-hydroxyvitamin D3 1alpha-hydroxylase) constructed by homology modeling. Using the three-dimensional model we studied the docking of the substrate, 25-hydroxyvitamin D3, into the substrate binding pocket of CYP27B1. In this study, we focused on the amino acid residues whose point mutations cause vitamin D-dependent rickets type 1, especially unconserved residues among mitochondrial CYPs such as Gln65 and Thr409. Recently, we successfully overexpressed mouse CYP27B1 by using a GroEL/ES co-expression system. In a mutation study of mouse CYP27B1 that included spectroscopic analysis, we concluded that in a 1alpha-hydroxylation process, Ser408 of mouse CYP27B1 corresponding to Thr409 of human CYP27B1 forms a hydrogen bond with the 25-hydroxyl group of 25-hydroxyvitamin D3. This is the first report that shows a critical amino acid residue recognizing the 25-hydroxyl group of the vitamin D3. |
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