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| 1 | Biogenic production of DMSP and its degradation to DMS—their roles in the global sulfur cycle显示文摘Dimethyl sulfide(DMS) is the most abundant form of volatile sulfur in Earth’s oceans, and is mainly produced by the enzymatic clevage of dimethylsulfoniopropionate(DMSP). DMS and DMSP play important roles in driving the global sulfur cycle and may affect climate. DMSP is proposed to serve as an osmolyte, a grazing deterrent, a signaling molecule, an antioxidant, a cryoprotectant and/or as a sink for excess sulfur. It was long believed that only marine eukaryotes such as phytoplankton produce DMSP. However, we recently discovered that marine heterotrophic bacteria can also produce DMSP, making them a potentially important source of DMSP. At present, one prokaryotic and two eukaryotic DMSP synthesis enzymes have been identified.Marine heterotrophic bacteria are likely the major degraders of DMSP, using two known pathways: demethylation and cleavage.Many phytoplankton and some fungi can also cleave DMSP. So far seven different prokaryotic and one eukaryotic DMSP lyases have been identified. This review describes the global distribution pattern of DMSP and DMS, the known genes for biosynthesis and cleavage of DMSP, and the physiological and ecological functions of these important organosulfur molecules, which will improve understanding of the mechanisms of DMSP and DMS production and their roles in the environment. | Xiao-Hua Zhang Ji Liu Jingli Liu Guipeng Yang Chun-Xu Xue Andrew R. J. Curson Jonathan D. Todd | 2019 | Science China(Life Sciences)2019，62，10： | 11 |
| 2 | Design of porous organic polymer catalysts for transformation of carbon dioxide显示文摘The transformation of carbon dioxide(CO_(2))into fuels and chemicals is an interesting topic,which has been paid much attention in recent years.The materials with specific functionalities are highly required for CO_(2)capture and conversion,which have been widely investigated.As an emerging material platform,porous organic polymers(POPs)have attracted considerable scientific interest due to their distinctive properties such as tailorable func-tionalization,large surface areas,adjustable porosity,versatile polymerizations,good physicochemical and thermal stability.Our group focuses on designing and synthesizing POPs via introducing CO_(2)-philic groups and organic ligands into the skeletons of the polymers and immobilizing metal active species onto their surface,and a series of POPs with functional groups,such as,azo,Tr€oger's base,fluorine,phenolic–OH,have been prepared for CO_(2)transformation.In this review article,we mainly introduce our recent work on design of POPs-based catalysts for CO_(2)transformation,which include POPs-based catalysts for cycloaddition reactions of epoxides and prop-argylic alcohols with CO_(2),for reductive transformation of CO_(2)with H 2,for photocatalytic/electrocatalytic reduction of CO_(2).In addition,the perspectives of the POP-based catalysts for CO_(2)transformation will be discussed as well. | Guipeng Ji Yanfei Zhao Zhimin Liu | 2022 | Green Chemical Engineering2022，3，2： | 1 |
| 3 | Metabolic engineering of Streptomyces to enhance the synthesis of valuable natural products显示文摘The mycelial bacterium Streptomyces is a workhorse for producing natural products,serving as a key source of drugs and other valuable chemicals.However,its complicated life cycle,silent biosynthetic gene clusters(BGCs),and poorly characterized metabolic mechanisms limit efficient production of natural products.There-fore,a metabolic engineering strategy,including traditional and emerging tools from different disciplines,was developed to further enhance natural product synthesis by Streptomyces.Here,current trends in systems metabolic engineering,including tools and strategies,are reviewed.Particularly,this review focuses on recent developments in the selection of methods for regulating the Streptomyces life cycle,strategies for the activation of silent gene clusters,and the exploration of regulatory mechanisms governing antibiotic production.Finally,future challenges and prospects are discussed. | Zuwei Xu Lihao Ji Wenxiu Tang Liang Guo Cong Gao Xiulai Chen Jia Liu Guipeng Hu Liming Liu | 2022 | Engineering Microbiology2022，2，2： | 0 |
| 4 | Temporally Separated CO_(2) Photoreduction and H_(2)O Photooxidation over Redox-Active Conjugated Organic Polymer Films显示文摘Photocatalytic CO_(2) reduction with H_(2)O of chemicals without H2 generation is interesting but challenging.Herein,we report temporally separated CO_(2) photoreduction and H_(2)O photooxidation that are achieved over redox-active o-hydroxyazo-based conjugated organic polymer films(HAzo-COPFs),affording CO with high efficiency as the sole reduction product.HAzo-COPFs are prepared via interfacial diazo-coupling reactions of aromatic diamines and diphenols,and HAzo-COPF-1 from 4,4′-biphenol and benzidine shows the best performance with a CO generation rate of 53.6μmol g−1 h−1 under visible-light irradiation(>420 nm).Interestingly,we discovered that diphenol(DP-OH)moieties in HAzo-COPFs,serving as electron and proton donors to participate in CO_(2) photoreduction,are oxidized into quinone(DP=O)moieties,which are subsequently photoreduced to regenerate DP-OH in H_(2)O photooxidation.Consequently,CO_(2) photoreduction and H_(2)O photooxidation are temporally separated and perfectly coupled via redox transformation between DP-OH and DP=O that form in situ,affording enhanced charge carrier separation and inhibiting the hydrogen evolution reaction.This work provides new insights for the design of COP photocatalysts and artificial photosynthesis. | Guipeng Ji Yuepeng Wang Wenqiang Ye Meifang Chen Fengtao Zhang Yanfei Zhao Shengrui Tong Buxing Han Zhimin Liu | 2023 | CCS Chemistry2023，5，8： | 0 |
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