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anaerobic environment as an efficient approach to improve the photostability of fatty acid photodecarboxylase

Chinese Chemical Letters 2023年第4期34卷 436-439页

作者： Xiaobo Guo Ao Xia Wuyuan Zhang Feng Li Yun Huang Xianqing Zhu Xun Zhu Qiang Liao Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing UniversityMinistry of EducationChongqing 400044China Institute of Engineering Thermophysics College of Energy and Power EngineeringChongqing UniversityChongqing 400044China Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China National Center of Technology Innovation for Synthetic Biology Tianjin 300308China

Fatty acid photodecarboxylase of Chlorella variabilis NC64A(CvFAP) is a novel photoenzyme with great potential in the treatment of waste lipids and production of sustainable aviation fuel. However, the fragile nature of Cv FAP to blue light is an urgent challenge. Herein, we demonstrated anaerobic environment could significantly improve the photostability of Cv FAP for the first time. The decarboxylation of palmitic acid by Cv FAP for 3 h under anaerobic environment increased pentadecane yield by 44.7% as compared to that under aerobic environment. The residual activity of Cv FAP after blue-light preillumination in the absence of palmitic acid for 0.5 h under anaerobic environment was 80.4%, which was 258.7 times higher than that under aerobic environment. Remarkable accumulation of superoxide radical and singlet oxygen in Cv FAP under aerobic environment led to the poor photostability of Cv FAP. anaerobic environment helped to mitigate the production of superoxide radical and singlet oxygen in Cv FAP, improving the photostability of Cv FAP.

关键词： Fatty acid photodecarboxylase Photostability anaerobic environment Reactive oxygen species Biofuel

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Adaptive evolution of Trichinella spiralis genes by comparative genomic analysis with related nematodes

Adaptive evolution of Trichinella spiralis genes by comparat...

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中国动物学会寄生虫学专业委员会第十届全国寄生虫学青年工作者学术研讨会

作者： Zigang Qu Wenhui Li Nianzhang Zhang Li Li Hongbin Yan Tingting Li Jianmin Cui Yang Yang Wanzhong Jia Baoquan Fu State Key Laboratory of Veterinary Etiological Biology Key Laboratory of Veterinary Public Health of the Ministry of Agriculture Key Laboratory of Veterinary Parasitology of Gansu Province Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease

Background: Trichinellosis is a parasitic disease of humans caused by nematodes of the genus Trichinella, and cause morbidity and mortality of human globally. Deciphering processes that drive species diversity and adaptation are key to understanding parasitism and developing control strategies. The aim of the present study was to analyse adaptation evolution of Trichinella spiralis genes by comparative genomic analysis with Brugia malayi, Trichuris suis, Ancylostoma aceylanicum and Caenorhabditis elegans and may serve as a foundation for future investigations to understand parasite anaerobic environment adaptation at molecular levels. Method: CODEML program from the PAML package was used to infer the most likely d N/d S ratio for each pair of sequences, the ones with d N/d S ratio > 1 were considered as positive selected genes. Results: A total of 986 genes were positive selected genes(p-value environments, purine metabolism, pyrimidine metabolism, starch and sucrose metabolism, amino sugar and nucleotide sugar metabolism and carbon metabolism);signaling pathway(c AMP signaling pathway, calcium signaling pathway and c GMP-PKG signaling pathway);cytosolic DNA-sensing pathway;RNA polymerase and neuroactive ligand-receptor interaction etc. Positive selected genes in T. spiralis consisted of SPARC(secreted protein acidic and rich in cysteine) gene that correlated with angiogenesis in nurse-cell complex, chitin synthase domain protein and cuticle collagen family genes, lysosomal aspartic protease and several cysteine protease genes as well as epigenetic-related genes that participated in DNA methylation, immune-modulation genes, energy metabolisms-related genes, differentiation or genomic reprogramming genes, DNA repair protein, cyclin-related genes, respiratory

关键词： T.spiralis positive selected genes(PSGs) anaerobic environment adaptive evolution

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