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Fang L, Li J, Chen X, Xu X. How lignocellulose degradation can promote the quality and function of dietary fiber from bamboo shoot residue by Inonotus obliquus fermentation. Food Chem 2024; 451:139479. [PMID: 38696939 DOI: 10.1016/j.foodchem.2024.139479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 04/16/2024] [Accepted: 04/23/2024] [Indexed: 05/04/2024]
Abstract
Lignocellulose constitutes the primary component of dietary fiber. We assessed how fermenting bamboo shoot residue with the medicinal white-rot fungus Inonotus obliquus affected the yield, composition, and functional attributes of dietary fiber by altering bamboo shoot residue lignocellulose's spatial structure and composition. I. obliquus secretes lignocellulolytic enzymes, which effectively enhance the degradation of holocellulose and lignin by 87.8% and 25.5%, respectively. Fermentation led to a more porous structure and reduced crystallinity. The yield of soluble dietary fiber increased from 5.1 g/100 g raw BSR to 7.1 g/100 g 9-day-fermented bamboo shoot residue. The total soluble sugar content of dietary fiber significantly increased from 9.2% to 13.8%, which improved the hydration, oil holding capacity, in vitro cholesterol, sodium cholate, and nitrite adsorption properties of dietary fiber from bamboo shoot residue. These findings confirm that I. obliquus biotransformation is promising for enhancing dietary fiber yield and quality.
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Affiliation(s)
- Lixiang Fang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Junchen Li
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xiaoxiao Chen
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Xiangqun Xu
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China; Shaoxing Academy of Biomedicine of Zhejiang Sci-Tech University, Shaoxing, China.
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Wang J, Yin R, Hashizume Y, Todoroki Y, Mori T, Kawagishi H, Hirai H. Ergosterol and Its Metabolites Induce Ligninolytic Activity in the Lignin-Degrading Fungus Phanerochaete sordida YK-624. J Fungi (Basel) 2023; 9:951. [PMID: 37755059 PMCID: PMC10532932 DOI: 10.3390/jof9090951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 09/19/2023] [Accepted: 09/19/2023] [Indexed: 09/28/2023] Open
Abstract
White-rot fungi are the most important group of lignin biodegraders. Phanerochaete sordida YK-624 has higher ligninolytic activity than that of model white-rot fungi. However, the underlying mechanism responsible for lignin degradation by white-rot fungi remains unknown, and the induced compounds isolated from white-rot fungi for lignin degradation have never been studied. In the present study, we tried to screen ligninolytic-inducing compounds produced by P. sordida YK-624. After large-scale incubation of P. sordida YK-624, the culture and mycelium were separated by filtration. After the separation and purification, purified compounds were analyzed by high-resolution electrospray ionization mass spectrometry and nuclear magnetic resonance. The sterilized unbleached hardwood kraft pulp was used for the initial evaluation of ligninolytic activity. Ergosterol was isolated and identified and it induced the lignin-degrading activity of this fungus. Moreover, we investigated ergosterol metabolites from P. sordida YK-624, and the ergosterol metabolites ergosta-4,7,22-triene-3,6-dione and ergosta-4,6,8(14),22-tetraen-3-one were identified and then chemically synthesized. These compounds significantly improved the lignin-degrading activity of the fungus. This is the first report on the ligninolytic-inducing compounds produced by white-rot fungi.
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Affiliation(s)
- Jianqiao Wang
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China;
| | - Ru Yin
- Graduate School of Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan;
| | - Yuki Hashizume
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan; (Y.H.); (Y.T.); (T.M.); (H.K.)
| | - Yasushi Todoroki
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan; (Y.H.); (Y.T.); (T.M.); (H.K.)
- Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Toshio Mori
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan; (Y.H.); (Y.T.); (T.M.); (H.K.)
- Research Institute for Mushroom Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Hirokazu Kawagishi
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan; (Y.H.); (Y.T.); (T.M.); (H.K.)
- Research Institute for Mushroom Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Hirofumi Hirai
- Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
- Research Institute for Mushroom Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
- Faculty of Global Interdisciplinary Science and Innovation, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
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Agnestisia R, Suzuki T, Ono A, Nakamura L, Nezu I, Tanaka Y, Aiso H, Ishiguri F, Yokota S. Lignin-degrading enzymes from a pathogenic canker-rot fungus Inonotus obliquus strain IO-B2. AMB Express 2023; 13:59. [PMID: 37302091 DOI: 10.1186/s13568-023-01566-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 06/02/2023] [Indexed: 06/13/2023] Open
Abstract
Inonotus obliquus is a pathogenic fungus found in living trees and has been widely used as a traditional medicine for cancer therapy. Although lignocellulose-degrading enzymes are involved in the early stages of host infection, the parasitic life cycle of this fungus has not been fully understood. In this study, we aimed to investigate the activities of laccase (Lac), manganese peroxidase (MnP), and lignin peroxidase (LiP) from I. obliquus cultivated in Kirk's medium. The fungus was subjected to genome sequencing, and genes related to wood degradation were identified. The draft genome sequence of this fungus comprised 21,203 predicted protein-coding genes, of which 134 were estimated to be related to wood degradation. Among these, 47 genes associated with lignin degradation were found to have the highest number of mnp genes. Furthermore, we cloned the cDNA encoding a putative MnP, referred to as IoMnP1, and characterized its molecular structure. The results show that IoMnP1 has catalytic properties analogous to MnP. Phylogenetic analysis also confirmed that IoMnP1 was closely related to the MnPs from Pyrrhoderma noxium, Fomitiporia mediterranea, and Sanghuangporus baumii, which belong to the same family of Hymenochaetaceae. From the above results, we suggest that IoMnP1 is a member of MnPs.
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Affiliation(s)
- Retno Agnestisia
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, 183-8509, Japan
- School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan
- Faculty of Mathematics and Natural Sciences, Universitas Palangka Raya, Palangka Raya, 73111, Indonesia
| | - Tomohiro Suzuki
- School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan.
- Center for Bioscience Research and Education, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan.
| | - Akiko Ono
- Center for Bioscience Research and Education, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan
| | - Luna Nakamura
- Center for Bioscience Research and Education, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan
| | - Ikumi Nezu
- School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan
| | - Yuki Tanaka
- Center for Bioscience Research and Education, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan
| | - Haruna Aiso
- Faculty of Agricultural Production and Management, Shizuoka Professional University of Agriculture, Iwata, Shizuoka, 438-0803, Japan
| | - Futoshi Ishiguri
- School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan
| | - Shinso Yokota
- School of Agriculture, Utsunomiya University, Utsunomiya, Tochigi, 321-8505, Japan.
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