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Title: NMR studies on lignocellulose deconstructions in the digestive system of the lower termite Coptotermes formosanus Shiraki
Authors: Tarmadi, Didi
Tobimatsu, Yuki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7578-7392 (unconfirmed)
Yamamura, Masaomi
Miyamoto, Takuji
Miyagawa, Yasuyuki
Umezawa, Toshiaki  kyouindb  KAKEN_id
Yoshimura, Tsuyoshi  kyouindb  KAKEN_id
Author's alias: 飛松, 裕基
山村, 正臣
宮本, 託志
梅澤, 俊明
吉村, 剛
Issue Date: 22-Jan-2018
Publisher: Springer Nature
Journal title: Scientific reports
Volume: 8
Thesis number: 1290
Abstract: Termites represent one of the most efficient lignocellulose decomposers on earth. The mechanism by which termites overcome the recalcitrant lignin barrier to gain access to embedded polysaccharides for assimilation and energy remains largely unknown. In the present study, softwood, hardwood, and grass lignocellulose diets were fed to Coptotermes formosanus workers, and structural differences between the original lignocellulose diets and the resulting feces were examined by solution-state multidimensional nuclear magnetic resonance (NMR) techniques as well as by complementary wet-chemical methods. Overall, our data support the view that lignin polymers are partially decomposed during their passage through the termite gut digestive system, although polysaccharide decomposition clearly dominates the overall lignocellulose deconstruction process and the majority of lignin polymers remain intact in the digestive residues. High-resolution NMR structural data suggested preferential removal of syringyl aromatic units in hardwood lignins, but non-acylated guaiacyl units as well as tricin end-units in grass lignins. In addition, our data suggest that termites and/or their gut symbionts may favor degradation of C–C-bonded β–5 and resinol-type β–β lignin inter-monomeric units over degradation of ether-bonded β–O–4 units, which is in contrast to what has been observed in typical lignin biodegradation undertaken by wood-decaying fungi.
Rights: © The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
URI: http://hdl.handle.net/2433/234088
DOI(Published Version): 10.1038/s41598-018-19562-0
PubMed ID: 29358744
Appears in Collections:Journal Articles

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