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Enzyme-directed pH-responsive exfoliation and dispersion of graphene and its decoration by gold nanoparticles for use as a hybrid catalyst

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Nano Research 2013年第9期6卷 693-702页

作者： Konggang qu li Wu Jinsong Ren Xiaogang qu Laboratory of Chemical Biology Division of Biological Inorganic Chemistry State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied Chemistry Graduate School of the Chinese Academy of Sciences Chinese Academy of Sciences ChangchunJilin 130022 China

A non-destructive, safe and practical strategy to produce high quality graphene in high yield is urgently required, since this would pave the way for a wide range of applications of graphene in the future. Here we present a pH-responsive water-dispersible method for the exfoliation and functionalization of graphene by using lysozyme. The pH-responsive dispersion of graphene may be useful for the reversible assembly of multicomponent/multifunctional nanohybrid materials and nanoscale electronic devices. More importantly, composites can be easily constructed through the interactions between disulphide groups in lysozyme and gold nanoparticles （AuNPs）. The resulting graphene-AuNPs composites show excellent catalytic activity towards reduction of o-nitroaniline by NaBH4. Since lysozyme is low cost and has antibacterial properties, and has been widely used in food preservation, medicine and the pharmaceutical industry, our approach may open a new scalable route for the manufacture of high-quality, nondestructive graphene for practical applications.

关键词： grapheme exfoliation lysozyme pH-responsive catalysis protein

Plant Mediator complex and its critical functions in transcription regulation

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Journal of Integrative Plant Biology 2016年第2期58卷 106-118页

作者： Yan Yang ling li li-Jia qu State Key Laboratory of Protein and Plant Gene Research Peking-Tsinghua Center for Life Sciences College of Life Sciences Peking University Beijing 100871 China The National Plant Gene Research Center (Beijing) Beijing 100101 China.

The Mediator complex is an important component of the eukaryotic transcriptional machinery. As an essential link between transcription factors and RNA polymerase II, the Mediator complex transduces diverse signals to genes involved in different pathways. The plant Mediator complex was recently purified and comprises conserved and specific subunits. It functions in concert with transcription factors to modulate various responses. In this review, we summarize the recent advances in understanding the plant Mediator complex and its diverse roles in plant growth, development, defense, non-coding RNA production, response to abiotic stresses, flowering, genomic stability and metabolic homeostasis. In addition, the transcription factors interacting with the Mediator complex are also highlighted.

关键词： Mediator complex transcription factors transcription regulation

Cysteine-rich peptides: signals for pollen tube guidance, species isolation and beyond

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Science China(life Sciences) 2019年第9期62卷 1243-1245页

作者： Sheng Zhong li-Jia qu State Key Laboratory for Protein and Plant Gene Research Peking-Tsinghua Center for Life Sciences at College of Life SciencesPeking UniversityBeijing 100871China The National Plant Gene Research Center (Beijing) Beijing 100101China

In flowering plants,the two sperm cells are passive cargo transported into the ovule by pollen tubes (Zhang et al.,2017).Therefore,the precise guidance of pollen tubes is critical for successful double fertilization (Dresselhaus and Franklin-Tong,2013).A series of male-female interactions are required to guarantee the spatiotemporal regulation of pollen tube guidance because during growth,pollen tubes continuously interact with different female tissues (Zhong et al.,2017;Zhong and qu,2019).In the past two decades,there has been tremendous progress in elucidating the molecular mechanisms of pollen tube guidance regulation,mostly using Arabidopsis thaliana as a model system (Johnson et al.,2019).

关键词： double fertilization pollen tube model system

Rice miR394 suppresses leaf inclination through targeting an F-box gene, LEAF INCliNATION 4

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Journal of Integrative Plant Biology 2019年第4期61卷 406-416页

作者： li qu li-Bi lin Hong-Wei Xue National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant Sciences Shanghai Institute of Plant Physiology and Ecology the Chinese Academy of Sciences University of the Chinese Academy of Sciences

Rice leaf inclination is an important agronomic trait, closely related to plant architecture and *** of genes controlling leaf inclination would assist in crop improvement. Although various factors,including the plant hormones auxin and brassinosteroids,have been shown to regulate lamina joint development,the role of microRNAs in regulating leaf inclination remains largely unknown. Here, we functionally characterize the role of rice miR394 and its target, LEAF INCliNCATION 4(LC4), which encodes an F-box protein, in the regulation of leaf inclination. We show that miR394 and LC4 work,antagonistically, to regulate leaf lamina joint development and rice architecture, by modulating expansion and elongation of adaxial parenchyma cells. Suppressed expression of miR394, or enhanced expression of LC4,results in enlarged leaf angles, whereas reducing LC4 expression by CRISPR/Cas9 leads to reduced leaf inclination, suggesting LC4 as candidate for use in rice architecture improvement. LC4 interacts with SKP1, a component of the SCF E3 ubiquitin ligase complex, and transcription of both miR394 and LC4 are regulated by auxin. Rice plants with altered expression of miR394 or LC4 have altered auxin responses, indicating that the miR394-LC4 module mediates auxin effects important for determining rice leaf inclination and architecture.

关键词： Rice miR394 F-box gene LEAF INCliNATION 4

Response to Zhang et al.,‘do egg cell-secreted aspartic proteases promote gamete attachment?'

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Journal of Integrative Plant Biology 2023年第1期65卷 7-9页

作者： Jiahao Jiang li-Jia qu State Key Laboratory for Protein and Plant Gene Research Peking-Tsinghua Center for Life Sciences at College of Life Sciences Peking UniversityBeijing 100871 China

In angiosperms,the molecular mechanism controlling polytubey/polyspermy block and fertilization recovery was not unraveled until recently(Zhong et al.,2022),which can be described as fol ows:Five pol en tube-expressed RALF peptide ligands,perceived by the receptor complex composed of three receptors FER/ANJ/HERK1 at the septum,establish the polytubey block at the septum so that only one pollen tube is allowed to emerge from the septum to target the ovule for *** tube rupture releases the two sperm cells and fertilization is completed within 20 min.

关键词： allowed release controlling

Significance of viral status on occurrence of hepatitis B-related hepatocellular carcinoma

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World Journal of Gastroenterology 2014年第20期20卷 5999-6005页

作者： li-Shuai qu Guo-Xiong Zhou Department of Gastroenterology Affiliated Hospital of Nantong University

Hepatitis B virus(HBV)infection remains a challenging global health problem,with more than 350 million people chronically infected and at risk of developing hepatocellular carcinoma(HCC).Interactions that occur among host,environmental,and viral factors determine the natural course and predict the prognosis of patients with chronic HBV *** the past decades,several important viral factors of predictive of HCC have been identified,such as high hepatitis B surface antigen level,seropositivity of hepatitis B e antigen,high viral load,viral genotype,and specific viral sequence *** of certain viral risk factors for HCC development and stratification of patient risk are very important to perform future surveillance *** this article,we thus reviewed the risk of viral factors involved in hepatocarcinogenesis.

关键词： Hepatitis B virus Hepatocellular carcinoma Mutation Serum hepatitis B virus-DNA levels Genotype

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Journal of Integrative Plant Biology 2012年第10期54卷 814-827页

作者： Guo Luo Hongya Gu Jingjing liu li-Jia qu State Key Laboratory for Protein and Plant Gene Research College of Life SciencesPeking-Tsinghua Center of Life SciencesPeking UniversityBeijing 100871China The National Plant Gene Research Center Beijing 100101China

Ubiquitination of proteins is one of the critical regulatory mechanisms in eukaryotes. In higher plants, protein ubiquitination plays an essential role in many biological processes, including hormone signaling, photomorphogenesis, and pathogen defense. However, the roles of protein ubiquitination in the repro- ductive process are not clear. In this study, we identified four plant-specific RING-finger genes designated Aberrant_Pollen Development 1_ （APD1） to APD4, as regulators of pollen mitosis II （PMII） in Arabidopsis thaliana （L.）. The apdl apd2 double mutant showed a significantly increased percentage of bicellular-like pollen at the mature pollen stage. Further downregulation of the APD3 and APD4 transcripts in apdl apd2 by RNA interference （RNAi） resulted in more severe abnormal bicellular-like pollen phenotypes than in apdl apd2, suggesting that cell division was defective in male gametogenesis. All of the four genes were expressed in multiple stages at different levels during male gametophyte development. Confocal analysis using green florescence fusion proteins （GFP） GFP-APD1 and GFP-APD2 showed that APDs are associated with intracellular membranes. Furthermore, APD2 had E2-dependent E3 ligase activity in vitro, and five APD2-interacting proteins were identified. Our results suggest that these four genes may be involved, redundantly, in regulating the PMII process during male gametogenesis.

关键词： Male gametogenesis pollen mitosis II RING-finger E3 ligase Arabidopsis.

Plant reproduction: Recent discoveries from China

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Journal of Integrative Plant Biology 2017年第9期59卷 591-593页

作者： li-Jia qu Meng-Xiang Sun College of life Sciences Peking UniversityBeijingChina College of life Sciences Wuhan UniversityWuhanChina

Sexual reproduction in higher plants consists of several major biological processes which include mega- and micro-gametogenesis, male-female communications, embryogenesis and endosperm development. Male-female communications include male gametophyte-sporophytic tissues （stigma/transmitting tract） interaction and male-female gametophyte communication, during which various signaling pathways are involved.

关键词： Recent discoveries from China

Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

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Journal of Advanced Ceramics 2023年第3期12卷 612-624页

作者： Runfa Tan Yoo Jae Jeong qu li Minje Kang In Sun Cho Department of Materials Science&Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea

Spinel zinc ferrite(ZnFe_(2)O_(4),ZFO)is a potential photoanode material for photoelectrochemical(PEC)water splitting because of its ideal bandgap(1.9–2.1 eV)and superior chemical stability in aqueous ***,the low charge collection efficiency significantly hinders the improvement in PEC ***,we report an ultrafast and effective flame activation route to enhance the charge collection properties of ***,high-temperature flame(>1300℃)facilitated surface and grain boundary diffusions,increasing the grain size and connectivity of the ZFO ***,the reducing atmosphere of the flame enabled the formation of surface defects(oxygen vacancy and Fe^(2+)),thereby increasing the charge carrier density and surface adsorption ***,these two factors promoted charge transport and transfer kinetics,resulting in a 10-fold increase in the photocurrent density over the unactivated ***,we deposited a thin Al_(2)O_(3)overlayer to passivate the ZFO surface and then the NiFeOx oxygen evolution catalyst(OEC)to expedite hole injection into the *** surface passivation and OEC deposition led to a remarkable photocurrent density of~1 mA/cm^(2)at 1.23 V versus the reversible hydrogen electrode,which is the highest value among all reported ZFO ***,the NiFeOx/Al_(2)O_(3)/F-ZFO photoanode achieved excellent photocurrent stability over 55 h(96%retention)and superior faradaic efficiency(FE>94%).Our flame activation method is also effective in improving the photocurrent densities of other spinel ferrites:CuFe_(2)O_(4)(93 times),MgFe_(2)O_(4)(16 times),and NiFe_(2)O_(4)(12 times).

关键词： spinel ferrites flame activation defect-rich surface charge collection photoelectrochemical(PEC) water splitting