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Chatake T, Yanagisawa Y, Murakami R, Ohsugi T, Sumi H, Takata T, Okuda A, Morishima K, Inoue R, Sugiyama M. Characterization of K-binding factor involved in water-soluble complex of menaquinone-7 produced by Bacillus subtilis natto. J Biochem 2023; 174:383-389. [PMID: 37419501 DOI: 10.1093/jb/mvad051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 06/15/2023] [Accepted: 07/02/2023] [Indexed: 07/09/2023] Open
Abstract
Vitamin Ks are expected to contribute bone and cardiovascular health. Especially, menaquinone-7 has a higher bioavailability and a longer half-life than other vitamin Ks in the human body. However, their low water-solubility limits their application. On the other hand, Bacillus subtilis natto produces a water-soluble complex, which comprises menaquinone-7 and peptides. The peptide named K-binding factor (KBF) has been reported as the main component of the complex. In the present, the structural characteristics of KBF were studied. Mass spectrometry showed significant peaks at m/z = 1050, while the previous PAGE suggested that molecular weight of KBF was ~ 3k. Amino acid analysis revealed that the 1k peptides were the various combinations of nine amino acids, among which Asx, Glx, Val, Leu and Met were found to be the most abundant. The peptides could serve as detergent properties. The 1k peptides could be isolated by reverse-phase high performance liquid chromatography. The bundle of three 1k detergent-like peptides would participate to the micelle structure containing menqauinone-7 inside. In conclusion, a basic unit of KBF would be the ~ 1k peptides, and the three basic unit assemble to the ~ 3k bundle, then the bundle form a water-soluble micelle including menqauinone-7 inside.
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Affiliation(s)
- Toshiyuki Chatake
- Insititute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Asashironishi-2, Osaka 590-0484, Japan
| | - Yasuhide Yanagisawa
- Faculty of Pharmaceutical Sciences, Chiba Institute of Science, Cho-shi, Shiomi-cho 15-8, Chiba 288-0025, Japan
| | - Risa Murakami
- Faculty of Pharmaceutical Sciences, Chiba Institute of Science, Cho-shi, Shiomi-cho 15-8, Chiba 288-0025, Japan
| | - Tadanori Ohsugi
- Department of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Tsurajima-cho, Nishinoura, Okayama 712-8001, Japan
| | - Hiroyuki Sumi
- Department of Life Science, Kurashiki University of Science and the Arts, Kurashiki, Tsurajima-cho, Nishinoura, Okayama 712-8001, Japan
| | - Takumi Takata
- Insititute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Asashironishi-2, Osaka 590-0484, Japan
| | - Aya Okuda
- Insititute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Asashironishi-2, Osaka 590-0484, Japan
| | - Ken Morishima
- Insititute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Asashironishi-2, Osaka 590-0484, Japan
| | - Rintaro Inoue
- Insititute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Asashironishi-2, Osaka 590-0484, Japan
| | - Masaaki Sugiyama
- Insititute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Asashironishi-2, Osaka 590-0484, Japan
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