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Mechanical and Corrosion Behavior of a biomedical Mg–6Zn–0.5Zr Alloy Containing a Large Number of Twins

Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 439-455页

作者： Chang‑Jian Yan Bo Guan Yun‑Chang Xin Ling‑Yu Zhao Guang‑Jie Huang Rui Hong Xiao‑Bo Chen Paul K.Chu Institute of Corrosion Science and Technology Guangdong 510070China International Joint Laboratory for Light Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Key Laboratory for Light‑Weight Materials Nanjing Tech UniversityNanjing 210009China School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China School of Engineering RMIT UniversityCarlton 3053VICAustralia Department of Physics Department of Materials Science&EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The strong texture of Mg alloys can lead to strong tension–compression yield asymmetry and corrosion anisotropy,and this will consequently affect the effectiveness of hard tissue implants.A biomedical Mg–6Zn–0.5Zr alloy containing a large number of{1012}primary twins and{1012}–{1012}secondary twins is successfully prepared by cross *** dual twin structure not only removes the tension–compression yield asymmetry completely,but effectively reduces the corrosion anisotropy without compromise of corrosion *** difference between the largest corrosion rate and smallest one is~1.2 times compared to~1.6 times of the original *** is found that the reduced corrosion anisotropy is related to re-distribution of crystallographic orientations by twins.

关键词： biomedical Mg alloy Corrosion Mechanical anisotropy Texture Twins

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No-Releasing Nanomotor-Loaded Microneedles Induce Melanoma Cell Death Via Intracellular Self-Assembly

SSRN

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SSRN 2024年

作者： Ding, Chensheng Liu, Nian Chen, Zhengwei Wu, Zhuolin Mao, Chun Wu, Ziyu Xie, Yuan Wan, Mimi National and Local Joint Engineering Research Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing210023 China Department of Vascular Surgery Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Nanjing210008 China Key Laboratory of Drug Metabolism and Pharmacokinetics State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing210009 China

Due to the particularity of melanoma location, traditional drug delivery methods face difficulties in penetrating skin tissue and specifically clearing melanoma cells. Here, we designed a hyaluronic acid microneedle drug delivery system loaded with nanomotors which can effectively penetrate the skin tissue and deliver the therapeutic components to melanoma and specifically remove melanoma cells. The loaded nanomotors were prepared by radical polymerization of methacryloyl modified L-arginine (MA) and L-tyrosine (MTyr), named as MA/MTyr nanomotor. The microneedle drug delivery system can use the rigid structure of microneedles to break through the skin barrier and deliver nanomotors to deep tissues. The MA endowed them with the ability to sensitively sense the highly expressed iNOS in the tumor microenvironment, so as to realize the effective targeting of melanoma in skin tissue and uptake by tumor cells. Subsequently, the MTyr can produce quinone-enriched intermediates that can induce cell death under the catalysis of tyrosinase that was specifically highly expressed in melanoma cells, and self-assembled to form micron scale fibers through intermolecular hydrogen bonding interactions, thereby inducing melanoma cells to swell. This process synergistically promoted melanoma cell death without occurring in normal cells. The experimental results of cell and animal models confirmed the good therapeutic effect of the nanomotor loaded microneedles, which provided a new therapeutic concept and strategy for the development of therapeutic methods specifically for melanoma. © 2024, The Authors. All rights reserved.

关键词： Hydrogen bonds

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A multi-stage semi-supervised learning for ankle fracture classification on CT images

arXiv

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arXiv 2024年

作者： Liu, Hongzhi Li, Guicheng Nie, Jiacheng Tang, Hui Yang, Chunfeng Feng, Qianjin Xu, Hailin Chen, Yang The School of Computer Science and Engineering Southeast University Nanjing210096 China The Peking University People's Hospital Beijing100000 China The Guangdong Provincial Key Laboratory of Medical Image Processing School of Biomedical Engineering Southern Medical University Guangzhou510515 China The Key Laboratory of New Generation Artificial Intelligence Technology and its Interdisciplinary Applications Southeast University Ministry of Education China Jiangsu Provincial Joint International Research Laboratory of Medical Information Processing School of Computer Science and Engineering Southeast University Nanjing210096 China Jiangsu Key Laboratory of Molecular and Functional Imaging Department of Radiology Zhongda Hospital Southeast University Nanjing210009 China

Because of the complicated mechanism of ankle injury, it is very difficult to diagnose ankle fracture in clinic. In order to simplify the process of fracture diagnosis, an automatic diagnosis model of ankle fracture was proposed. Firstly, a tibia-fibula segmentation network is proposed for the joint tibiofibular region of the ankle joint, and the corresponding segmentation dataset is established on the basis of fracture data. Secondly, the image registration method is used to register the bone segmentation mask with the normal bone mask. Finally, a semi-supervised classifier is constructed to make full use of a large number of unlabeled data to classify ankle fractures. Experiments show that the proposed method can segment fractures with fracture lines accurately and has better performance than the general method. At the same time, this method is superior to classification network in several indexes. Copyright © 2024, The Authors. All rights reserved.

关键词： Image classification

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Differential regulation of JAK1 expression by ETS1 associated with predisposition to primary biliary cholangitis

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Journal of Genetics and Genomics 2023年第10期50卷 807-812页

作者： Peng Jiang Chan Wang Mingming Zhang Ye Tian Weifeng Zhao Junyi Xin Yexi Huang Zhibin Zhao Wenjuan Sun Jie Long Ruqi Tang Fang Qiu Xingjuan Shi Yi Zhao Li Zhu Na Dai Lei Liu Xudong Wu Jinshan Nie Bo Jiang Youlin Shao Yueqiu Gao Jianjiang Yu Zhigang Hu Zhidong Zang Yuhua Gong Yaping Dai Lan Wang Ningling Ding Ping Xu Sufang Chen Lu Wang Jing Xu Luyao Zhang Junyan Hong Ruonan Qian Hu Li Xuan Jiang Congwei Chen Wenyan Tian Jian Wu Yuzhang Jiang Chongxu Han Kui Zhang Hong Qiu Li Li Hong Fan Liming Chen Jianqiong Zhang Zhongsheng Sun Xiao Han Zhenhua Dai Erguang Li M.Eric Gershwin Zhexiong Lian Xiong Ma Michael F.Seldin Weichang Chen Meilin Wang Xiangdong Liu Key Laboratory of Developmental Genes and Human Diseases School of Life Science and TechnologySoutheast UniversityNanjingJiangsu 210096China Institute of Translational Medicine Yangzhou University Medical CollegeYangzhouJiangsu 225009China Department of Radiology&Oncology The Second Affiliated Hospital of Soochow UniversitySuzhouJiangsu 215004China The First Affiliated Hospital of Soochow University SuzhouJiangsu 215006China Department of Bioinformatics School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjingJiangsu 210029China Author links open overlay panelYexi Huang Guangdong Provincial People's Hospital Guangdong Academy of Medical SciencesGuangzhouGuangdong 510080China Department of Gastroenterology and Hepatology Shanghai Institute of Digestive DiseasesShanghai Jiao Tong University School of Medicine Affiliated Renji HospitalShanghai 200001China Department of Laboratory Medicine The Fourth Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsu 210031China Department of Gastrointestinal Endoscopy Eastern Hepatobiliary Surgery HospitalShanghai 201800China The Fifth People's Hospital Soochow UniversitySuzhouJiangsu 215007China Department of Gastroenterology Jiangsu University Affiliated Kunshan HospitalKunshanJiangsu 215300China Department of Gastroenterology Yixing People's HospitalYixinJiangsu 214200China Department of Gastroenterology Yancheng First People's HospitalYanchengJiangsu 224005China Department of Gastroenterology Taicang First People's HospitalSoochow UniversityTaicangJiangsu 215400China Department of Hepatology Jingjiang Second People's HospitalJingjiangJiangsu 214500China Department of Hepatology The Third People's Hospital of ChangzhouChangzhouJiangsu 213001China Department of Liver Diseases Shuguang HospitalShanghai University of Traditional Chinese MedicineShanghai 201203China Department of Laboratory Medicine Jiangyin People's HospitalSoutheast UniversityJiangyinJiangsu 214400China Department of Labora

Primary biliary cholangitis(PBC)is an autoimmune liver disease characterized by the destruction of intrahepatic small bile ducts and progressive cholestasis,eventually leading to liver cirrhosis and hepatic failure wi... 详细信息

关键词： cholangitis biliary

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Technology Roadmap for Flexible Sensors

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ACS NANO 2023年第6期17卷 5211-5295页

作者： Luo, Yifei Abidian, Mohammad Reza Ahn, Jong-Hyun Akinwande, Deji Andrews, Anne M. Antonietti, Markus Bao, Zhenan Berggren, Magnus Berkey, Christopher A. Bettinger, Christopher John Chen, Jun Chen, Peng Cheng, Wenlong Cheng, Xu Choi, Seon-Jin Chortos, Alex Dagdeviren, Canan Dauskardt, Reinhold H. Di, Chong-an Dickey, Michael D. Duan, Xiangfeng Facchetti, Antonio Fan, Zhiyong Fang, Yin Feng, Jianyou Feng, Xue Gao, Huajian Gao, Wei Gong, Xiwen Guo, Chuan Fei Guo, Xiaojun Hartel, Martin C. He, Zihan Ho, John S. Hu, Youfan Huang, Qiyao Huang, Yu Huo, Fengwei Hussain, Muhammad M. Javey, Ali Jeong, Unyong Jiang, Chen Jiang, Xingyu Kang, Jiheong Karnaushenko, Daniil Khademhosseini, Ali Kim, Dae-Hyeong Kim, Il-Doo Kireev, Dmitry Kong, Lingxuan Lee, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Li, Fengyu Li, Jinxing Liang, Cuiyuan Lim, Chwee Teck Lin, Yuanjing Lipomi, Darren J. Liu, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Loh, Xian Jun Lu, Nanshu Lv, Zhisheng Magdassi, Shlomo Malliaras, George G. Matsuhisa, Naoji Nathan, Arokia Niu, Simiao Pan, Jieming Pang, Changhyun Pei, Qibing Peng, Huisheng Qi, Dianpeng Ren, Huaying Rogers, John A. Rowe, Aaron Schmidt, Oliver G. Sekitani, Tsuyoshi Seo, Dae-Gyo Shen, Guozhen Sheng, Xing Shi, Qiongfeng Someya, Takao Song, Yanlin Stavrinidou, Eleni Su, Meng Sun, Xuemei Takei, Kuniharu Tao, Xiao-Ming Tee, Benjamin C. K. Thean, Aaron Voon-Yew Trung, Tran Quang Wan, Changjin Wang, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Weiss, Paul S. Wen, Hanqi Xu, Sheng Xu, Tailin Yan, Hongping Yan, Xuzhou Yang, Hui Yang, Le Yang, Shuaijian Yin, Lan Yu, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Zamburg, Evgeny Zhang, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhao, Siyuan Zhao, Xuanhe Zheng, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zhou, Tao Zhu, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zou, Guijin Chen, Xiaodong 08-03 Innovis Singapore 138634 Republic of Singapore Innovative Centre for Flexible Devices (iFLEX) School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Biomedical Engineering University of Houston Houston Texas 77024 United States School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 United States Microelectronics Research Center The University of Texas at Austin Austin Texas 78758 United States Department of Chemistry and Biochemistry California NanoSystems Institute and Department of Psychiatry and Biobehavioral Sciences Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology University of California Los Angeles Los Angeles California 90095 United States Colloid Chemistry Department Max Planck Institute of Colloids and Interfaces 14476 Potsdam Germany Department of Chemical Engineering Stanford University Stanford California 94305 United States Laboratory of Organic Electronics Department of Science and Technology Campus Norrköping Linköping University 83 Linköping Sweden Wallenberg Initiative Materials Science for Sustainability (WISE) and Wallenberg Wood Science Center (WWSC) SE-100 44 Stockholm Sweden Department of Materials Science and Engineering Stanford University Stanford California 94301 United States Department of Biomedical Engineering and Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Department of Bioengineering University of California Los Angeles Los Angeles California 90095 United States School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637457 Singapore Nanobionics Group Department of Chemical and Biological Engineering Monash University Clayton Australia 3800 Monash

Humans rely increasingly on sensors to address grand challenges and to improve quality of life in the era of digitalization and big data. For ubiquitous sensing, flexible sensors are developed to overcome the limitations of conventional rigid counterparts. Despite rapid advancement in bench-side research over the last decade, the market adoption of flexible sensors remains limited. To ease and to expedite their deployment, here, we identify bottlenecks hindering the maturation of flexible sensors and propose promising solutions. We first analyze continued...challenges in achieving satisfactory sensing performance for real-world applications and then summarize issues in compatible sensor-biology interfaces, followed by brief discussions on powering and connecting sensor networks. Issues en route to commercialization and for sustainable growth of the sector are also analyzed, highlighting environmental concerns and emphasizing nontechnical issues such as business, regulatory, and ethical considerations. Additionally, we look at future intelligent flexible sensors. In proposing a comprehensive roadmap, we hope to steer research efforts towards common goals and to guide coordinated development strategies from disparate communities. Through such collaborative

关键词： soft materials mechanics engineering flexible electronics conformable sensors bioelectronics human-machine interfaces body area sensor networks technology translation sustainable electronics

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No-releasing nanomotor-loaded microneedles induce melanoma cell death via intracellular self-assembly

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International journal of pharmaceutics 2025年 681卷 125820页

作者： Chensheng Ding Nian Liu Zhengwei Chen Zhuolin Wu Chun Mao Ziyu Wu Yuan Xie Mimi Wan National and Local Joint Engineering Research Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China. Department of Vascular Surgery Cardiovascular Medical Center Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Nanjing 210008 China. Electronic address: wuziyunjumed@***. Key Laboratory of Drug Metabolism and Pharmacokinetics State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China. Electronic address: yuanxie@***. National and Local Joint Engineering Research Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China. Electronic address: wanmimi@***.

Due to the particularity of melanoma location, traditional drug delivery methods face difficulties in penetrating skin tissue and specifically clearing melanoma cells. Here, we designed a hyaluronic acid microneedle drug delivery system loaded with nanomotors which can effectively penetrate the skin tissue and deliver the therapeutic components to melanoma and specifically remove melanoma cells. The loaded nanomotors were prepared by radical polymerization of methacryloyl modified L-arginine (MA) and L-tyrosine (MTyr), named as MA/MTyr nanomotor. The microneedle drug delivery system can use the rigid structure of microneedles to break through the skin barrier and deliver nanomotors to deep tissues. The MA endowed them with the ability to sensitively sense the highly expressed inducible nitric oxide synthase in the tumor microenvironment, so as to realize the effective targeting of melanoma in skin tissue and uptake by tumor cells. Subsequently, the MTyr can produce quinone-enriched intermediates that can induce cell death under the catalysis of tyrosinase that was specifically highly expressed in melanoma cells, and self-assembled to form micron scale fibers through intermolecular hydrogen bonding interactions, thereby inducing melanoma cells to swell. This process synergistically promoted melanoma cell death without occurring in normal cells. The experimental results of cell and animal models confirmed the good therapeutic effect of the nanomotor loaded microneedles, which provided a new therapeutic concept and strategy for the development of therapeutic methods specifically for melanoma.

关键词： Intracellular self-assembly induces death Melanoma Microneedles Nanomotors

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Near-infrared small molecular fluorescent dyes for photothermal therapy

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Chinese Chemical Letters 2019年第7期30卷 1353-1360页

作者： Yisha Chen Li Li Weijie Chen Haiyan Chen Jun Yin Department of Biomedical Engineering School of Engineering State Key Laboratory of Natural Medicines China Pharmaceutical University Nanjing 210009 China Key Laboratory of Pesticide and Chemical Biology Ministry of Education Hubei International Scientific and Technological Cooperation Base of Pesticide and Green Synthesis International Joint Research Center for Intelligent Biosensing Technology and Health College of Chemistry Central China Normal University Wuhan 430079 China

Near-infrared(NIR)fluorescent dyes based on small organic molecules are characterized with low cytotoxicity,good biocompatibility and minimum interference from auto-fluorescence background,which are widely used in tumor *** research on molecular properties and photothermal properties of fluorescent dyes have been explored for non-invasive photothermal treatment of *** this review,we focus on the development of imaging-induced photothermal therapy of small molecules and classification according to the structures of organic molecules including cyanines,phthalocyanines,rhodamine analogues and BODIPYs.

关键词： Near-infrared fluorescent dyes Photothermal therapy Cyanine BODIPY Phthalocyanine

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Photodynamic therapy based on organic small molecular fluorescent dyes

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Chinese Chemical Letters 2019年第10期30卷 1689-1703页

作者： Li Li Yisha Chen Weijie Chen Ying Tan Haiyan Chen Jun Yin Department of Biomedical Engineering School of EngineeringState Key Laboratory of Natural MedicinesChina Pharmaceutical UniversityNanjing 210009China Key Laboratory of Pesticide and Chemical Biology Ministry of EducationHubei International Scientific and Technological Cooperation Base of Pesticide and Green SynthesisInternational Joint Research Center for Intelligent BiosensingTechnology and HealthCollege of ChemistryCentral China Normal UniversityWuhan 430079China State Key Laboratory of Chemical Oncogenomics Key Laboratory of Chemical Biologythe Graduate School at ShenzhenTsinghua UniversityShenzhen 518055China

Photodynamic therapy(PDT) has shown promise as an effective treatment modality for cancer and other localized diseases due to its noninvasive properties and spatiotemporal selectivity. Near-infrared(NIR)fluorescent dyes based on organic small molecules are characterized with low cytotoxicity, good biocompatibility and excellent phototoxicity, which are widely used in PDT. In this review, we attempt to summarize the development of imaging-induced PDT based on organic small molecules and classify it according to the structures of dyes including cyanines, 4,4-difluoro-4-bora-3 a,4 a-diaza-s-indacene(BODIPY) analogues, phthalocyanine and other agents such as rhodamine analogues.

关键词： Near-infrared fluorescent dyes Photodynamic therapy Cyanine BODIPY Phthalocyanine

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Humoral immune response to circulating SARS-CoV-2 variants elicited by inactivated and RBD-subunit vaccines

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细胞研究（英文版） 2021年第7期31卷 732-741页

作者： Yunlong Cao Ayijiang Yisimayi Yali Bai Weijin Huang Xiaofeng Li Zhiying Zhang Tianjiao Yuan Ran An Jing Wang Tianhe Xiao Shuo Du Wenping Ma Liyang Song Yongzheng Li Xiang Li Weiliang Song Jiajing Wu Shuo Liu Xuemei Li Yonghong Zhang Bin Su Xianghua Guo Yangyang Wei Chuanping Gao Nana Zhang Yifei Zhang Yang Dou Xiaoyu Xu Rui Shi Bai Lu Ronghua Jin Yingmin Ma Chengfeng Qin Youchun Wang Yingmei Feng Junyu Xiao Xiaoliang Sunney Xie Beijing Advanced Innovation Center for Genomics (ICG) Peking UniversityBeijingChina Biomedical Pioneering Innovation Center (BIOPIC) Peking UniversityBeijingChina Beijing Advanced Innovation Center for Genomics (ICG) Peking UniversityBeijingChina Biomedical Pioneering Innovation Center (BIOPIC) Peking UniversityBeijingChina School of Life Sciences Peking UniversityBeijingChina Beijing Advanced Innovation Center for Genomics (ICG) Peking UniversityBeijingChina Joint Graduate Program of Peking-Tsinghua-NIBS School of Life SciencesTsinghua UniversityBeijingChina Division of HIV/AIDS and Sex-transmitted Virus Vaccines Institute for Biological Product ControlNational Institutes for Food and Drug Control (NIFDC) and WHO Collaborating Center for Standardization and Evaluation of BiologicalsBeijingChina State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyAcademy of Military Medical SciencesBeijingChina Beijing Advanced Innovation Center for Genomics (ICG) Peking UniversityBeijingChina School of Life Sciences Peking UniversityBeijingChina Beijing Advanced Innovation Center for Genomics (ICG) Peking UniversityBeijingChina Biomedical Pioneering Innovation Center (BIOPIC) Peking UniversityBeijingChina Peking-Tsinghua Center for life Sciences Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijingChina Beijing Youan Hospital Capital Medical UniversityBeijingChina Beijing Advanced Innovation Center for Genomics (ICG) Peking UniversityBeijingChina Peking-Tsinghua Center for life Sciences Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijingChina School of Pharmaceutical Sciences IDG/McGovern Institute for Brain ResearchTsinghua UniversityBeijingChina Vazyme Biotech Co. LtdNanjingJiangsuChina CAS Key Laboratory of Microbial Physiological and Metabolic Engineering Institute of MicrobiologyChinese Academy of SciencesBeijingChina Beijing Ditan Hospital Capital Medical UniversityBeijingChina

SARS-CoV-2 variants could induce immune escape by mutations on the receptor-binding domain (RBD) and N-terminal domain(NTD).Here we report the humoral immune response to circulating SARS-CoV-2 variants,such as 501Y.V2 (B.1.351),of the plasma and neutralizing antibodies (NAbs) elicited by CoronaVac (inactivated vaccine),ZF2001 (RBD-subunit vaccine) and natural *** 86 potent NAbs identified by high-throughput single-cell VDJ sequencing of peripheral blood mononuclear cells from vaccinees and convalescents,near half anti-RBD NAbs showed major neutralization reductions against the K417N/E484K/N501Y mutation combination,with E484K being the dominant ***3-53/VH3-66 recurrent antibodies respond differently to RBD variants,and K417N compromises the majority of neutralizing activity through reduced polar contacts with complementarity determining *** contrast,the 242-244 deletion (242-244A) would abolish most neutralization activity of anti-NTD NAbs by interrupting the conformation of NTD antigenic supersite,indicating a much less diversity of anti-NTD NAbs than anti-RBD *** of convalescents and CoronaVac vaccinees displayed comparable neutralization reductions against pseudo-and authentic 501Y.V2 variants,mainly caused by E484K/N501Y and 242-244△,with the effects being ***,RBD-subunit vaccinees exhibit markedly higher tolerance to 501Y.V2 than convalescents,since the elicited anti-RBD NAbs display a high diversity and are unaffected by NTD ***,an extended gap between the third and second doses of ZF2001 leads to better neutralizing activity and tolerance to 501Y.V2 than the standard three-dose ***,these results suggest that the deployment of RBD-vaccines,through a third-dose boost,may be ideal for combating SARS-CoV-2 variants when necessary,especially for those carrying mutations that disrupt the NTD supersite.

关键词： Cryoelectron microscopy Immunology X-ray crystallography

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In Vivo Multienzyme Complex Coconstruction of N-Acetylneuraminic Acid Lyase and N-Acetylglucosamine-2-epimerase for Biosynthesis of N-Acetylneuraminic Acid

引用

Journal of agricultural and food chemistry 2017年第34期65卷 7467-7475页

作者： Zhenfu Wang Wei Zhuang Jian Cheng Wujin Sun Jinglan Wu Yong Chen Hanjie Ying State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University No. 5 Xinmofan Road Nanjing 210009 China. College of Biotechnology and Pharmaceutical Engineering National Engineering Technique Research Center for Biotechnology Nanjing Tech University No. 30 Puzhu South Road Nanjing 211816 China. Synergetic Innovation Center for Advanced Materials Nanjing Tech University No. 30 Puzhu South Road Nanjing 211816 China. Joint Department of Biomedical Engineering University of North Carolina at Chapel Hill and North Carolina State University Raleigh North Carolina 27695 United States.

Metabolic channeling enables efficient transfer of the intermediates by forming a multienzyme complex. To leverage the metabolic channeling for improved biosynthesis, we coexpressed N-acetylneuraminic acid lyase from C. glutamicum ATCC 13032 (CgNal) and N-acetylglucosamine-2-epimerase from Anabaena sp. CH1 (anAGE) in Escherichia coli and used the whole cell to synthesize N-acetylneuraminic acid (Neu5Ac) from N-acetylglucosamine (GlcNAc) and pyruvate. To get the multienzyme complex, polycistronic plasmid with high levels of CgNal and anAGE expression was constructed by tuning the orders of the genes. The Shine-Dalgarno (SD) sequence and aligned spacing (AS) distance were optimized. The E. coli Rosetta harboring the polycistronic plasmid pET-28a-SD-AS-CgNal-SD-AS-anAGE increased the production of Neu5Ac by 58.7% to 92.5 g/L in 36 h by whole-cell catalysis and by 21.9% up to 112.8 g/L in 24 h with the addition of Triton X-100.

关键词： N-acetylglucosamine-2-epimerase N-acetylneuraminic acid N-acetylneuraminic acid lyase Shine−Dalgarno biosynthesis multienzyme multienzyme complex

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