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Kim, Yong Hwan
School of Energy and Chemical Engineering
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  • 바이오촉매 생물 전환 생물환경

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Extra disulfide and ionic salt bridge improves the thermostability of lignin peroxidase H8 under acidic condition

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Title
Extra disulfide and ionic salt bridge improves the thermostability of lignin peroxidase H8 under acidic condition
Author
Son, HaewonSeo, HogyunHan, SeunghyunKim, Suk MinPham, Le Thanh MaiKhan, Mohd FaheemSung, Ho JoonKang, Sung HeuckKim, Kyung-JinKim, Yong Hwan
Issue Date
2021-08
Publisher
Elsevier BV
Citation
ENZYME AND MICROBIAL TECHNOLOGY, v.148, pp.109803
Abstract
The development of a lignin peroxidase (LiP) that is thermostable even under acidic pH conditions is a main issue for efficient enzymatic lignin degradation due to reduced repolymerization of free phenolic products at acidic pH (< 3). Native LiP under mild conditions (half-life (t1/2) of 8.2 days at pH 6) exhibits a marked decline in thermostability under acidic conditions (t1/2 of only 14 min at pH 2.5). Thus, improving the thermostability of LiP in acidic environments is required for effective lignin depolymerization in practical applications. Here, we show the improved thermostability of a synthetic LiPH8 variant (S49C/A67C/H239E, PDB: 6ISS) capable of strengthening the helix–loop interactions under acidic conditions. This variant retained excellent thermostability at pH 2.5 with a 10-fold increase in t1/2 (2.52 h at 25 °C) compared with that of the native enzyme. X-ray crystallography analysis showed that the recombinant LiPH8 variant is the only unique lignin peroxidase containing five disulfide bridges, and the helix–loop interactions of the synthetic disulfide bridge and ionic salt bridge in its structure are responsible for stabilizing the Ca2+-binding region and heme environment, resulting in an increase in overall structural resistance against acidic conditions. Our work will allow the design of biocatalysts for ligninolytic enzyme engineering and for efficient biocatalytic degradation of plant biomass in lignocellulose biorefineries.
URI
https://scholarworks.unist.ac.kr/handle/201301/52770
URL
https://www.sciencedirect.com/science/article/pii/S0141022921000612
DOI
10.1016/j.enzmictec.2021.109803
ISSN
0141-0229
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