Lytic polysaccharide monooxygenases (LPMOs) are cupper ion containing enzymes to degrade crystalline polysaccharides, such as cellulose or chitin through an oxidative mechanism. To the best of our knowledge, there is no assay method for direct characterization of LPMOs to degrade the substrates without hydrolases used as the coupled enzymes. In this study, a hydrolase-free assay method for LPMOs was developed, which is based on measuring the consumption of ascorbic acid used as an external electron donor for LPMOs. The ascorbate-based assay method yielded a pH profile with pH 8, which was consistent with the analysis of synergestic effect of BatLPMO10 for chitin degradation in the presence of a chitinase. In addition, the assay method let us know that BatLPMO10 was inhibited by sodium ion, and BatLPMO10 and the coupling chitinase cooperatively enhanced their activities for the degradation of chitin. In conclusion, the hydrolase-free assay method for the polysaccharide degradation catalyzed by LPMOs has been developed for the first time, and this assay method would be useful to search LPMOs with the same optimum pH as its coupled hydrolases or vise versa for improvement of the biomass degradation.
저자
Mi-Ji Yu [ Department of Food and Biotechnology, Korea University, Sejong, 339-700 ]
Gi-Tae Kim [ Department of Food and Biotechnology, Korea University, Sejong, 339-700 ]
Young-Wan Kim [ Department of Food and Biotechnology, Korea University, Sejong, 339-700 ]
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.