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Structural and biochemical insights into human zinc finger protein AEBP2 reveals interactions with RBBP4

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Protein & Cell 2018年第8期9卷 738-742页

作者： Aiai Sun Fudong Li Zhonghua Liu, Yiyang Jiang Jiahai Zhang jihui wu Yunyu Shi Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences University of Science and Technology of China Hefei 230027 China

Dear Editor,Polycomb repressive complex 2 （PRC2） plays a critical role in organ development, adult homeostasis, and tumorigene- sis via enzymatic activities to di- or td-methylate lysine 27 of H3 （H3K27me2/me3）, which is a hallmark of transcriptional repression and gene silencing （Margueron and Reinberg, 2011）.

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Efficacy of moxibustion by stimulating acupoints of Danzhong(CV 17) and Ganshu(BL 18) on hyperplasia of mammary gland in rats

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Journal of Traditional Chinese Medicine 2018年第1期38卷 76-82页

作者： Yang Jiamin wu jihui Shen Xiaoyu Zhang Mei Liu Zhenzhen Qi Dandan Zhou Jin Cui Xiao Zhang Lufen Li Yuhang School of Basic Medical Science Beijing University of Chinese Medicine School of Fashion Art and Engineering Beijing Institute of Fashion Technology School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine

OBJECTIVE: To evaluate the efficacy of moxibustion, through stimulating acupoints of Danzhong(CV 17) and Ganshu(BL 18) in rats with hyperplasia of mammary gland(HMG) which induced by estrogen and ***: Thirty female Sprague-Dawley rats were randomly divided into saline control group,HMG model group, and HMG moxibustion group with 10 in each group. Saline control was the group injected by saline. HMG model were created by injection of estrogen and progestogen. Moxibustion group was also injected of estrogen and progesto-gen with moxibustion at the same time. The Changes of nipple diameter and height were *** rats' skin temperature was recorded by an infrared thermal camera at the nipples, mammary areas,Danzhong(CV 17) and Ganshu(BL 18). Pathological changes of mammary gland in rats were also observed under light ***: The diameter and height of the nipples in model group were prominently bigger and higher than that in control group(P < 0.01). The diameter and height in moxibustion group were prominently smaller and lower than that in model group(P < 0.01), and there was no significant difference between moxibustion group and control *** with control group, skin temperature of the nipples, mammary area, and acupoints Danzhong(CV 17) and Ganshu(BL 18) decreased prominently in model group(P < 0.01-0.05). Compared with model group, skin temperature of that in moxibustion group increased prominently(P <0.05).CONCLUSION: Treatment with moxibustion can effectively decrease the HMG rats' nipple diameter and height, and increase the skin temperature in HMG model rats at the nipples, mammary areas,Danzhong(CV 17) and Ganshu(BL 18). This study convinces the therapeutic effect of moxibustion on mammary gland hyperplasia.

关键词： Moxibustion Fibrocystic disease of breast Skin temperature Thermography Point CVl 7 (Tanzhong) Point BL18 (Ganshu)

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Ultrasound Driving Application of a Universal Waveform Generator Derived from Displaying Driving System

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Journal of Computer and Communications 2014年第13期2卷 9-17页

作者： Chang Ge jihui wu Yongming Tang Department of Electrical and Computer Engineering University of Alberta Edmonton Canada School of Electronic Science and Engineering Southeast University Nanjing China

The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers is verified by the test of the circuit and compared with other specific design of pulse generator for ultrasound driving purpose.

关键词： Universal Waveform Generator Ultrasound Pulse Miller Integrator Circuit

Driving force of biomolecular liquid–liquid phase separation probed by nuclear magnetic resonance spectroscopy

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Biophysics Reports 2022年第2期8卷 90-99页

作者： Hanyu Zhang Weiwei Fan Gilbert Nshogoza Yaqian Liu Jia Gao jihui wu Yunyu Shi Xiaoming Tu Jiahai Zhang Ke Ruan Ministry of Education Key Laboratory for Membraneless Organelles & Cellular Dynamics Hefei National Laboratory for Physical Sciences at the Microscale School of Life SciencesDivision of Life Sciences and Medicine University of Science and Technology of China Department of Applied Chemistry College of Science and Technology University of Rwanda

The assembly of biomolecular condensates is driven by liquid–liquid phase separation. To understand the structure and functions of these condensates, it is essential to characterize the underlying driving forces, e.g., protein–protein and protein–RNA interactions. As both structured and low-complexity domains are involved in the phase separation process, NMR is probably the only technique that can be used to depict the binding topology and interaction modes for the structured and nonstructured domains simultaneously. Atomic-resolution analysis for the intramolecular and intermolecular interactions between any pair of components sheds light on the mechanism for phase separation and biomolecular condensate assembly and disassembly. Herein, we describe the procedures used for the most extensively employed NMR techniques to characterize key interactions for biomolecular phase separation.

关键词： Liquid–liquid phase separation Membraneless organelles NMR spectroscopy Chemical shift perturbation Paramagnetic relaxation enhancement

Recent progress in fragment-based drug discovery facilitated by NMR spectroscopy

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Magnetic Resonance Letters 2022年第2期2卷 107-118,I0003页

作者： Lei Wang Jia Gao Rongsheng Ma Yaqian Liu Mingqing Liu Fumei Zhong Jie Hu Shuju Li jihui wu Hualiang Jiang Jiahai Zhang Ke Ruan The First Affiliated Hospital of USTC Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei230001China Ministry of Education Key Laboratory for Membraneless Organelles&Cellular Dynamics Hefei National Laboratory for Physical Sciences at the MicroscaleSchool of Life SciencesDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei230027China Drug Discovery and Design Center State Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of Sciences555 Zuchongzhi RoadShanghai201203China

Considerable developments have been observed in fragment-based lead/drug discovery(FBLD/FBDD)recently,with four drugs approved and many others under *** magnetic resonance(NMR)has gained increasing popularity in FBLD due to its intrinsic capability in characterizing protein-ligand interactions in a large dynamic range of affinity,from weak hits to highly potent ***,we summarize NMR applications in fragment-based hit-to-lead evolution,including the construction of a fragment library,screening methods,spectra processing,and the delineation of the protein-ligand binding *** state-of-the-art NMR techniques have been exemplified in the discovery of inhibitors against multiple targets over the past five years,and they are expected to continue to provide new insights in the future.

关键词： Fragment-based lead/drug discovery NMR spectroscopy Protein-ligand interaction Complex structure Hit-to-lead evolution

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Hfq bridged ternary complex is important for translation activation of rpoS by DsrA

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Hfq bridged ternary complex is important for translation act...

NMR backbone assignment of large proteins using 13Cα-only triple resonance experiments

第四届中国结构生物学学术讨论会

作者： Weiwei Wang Lijun Wang jihui wu Qingguo Gong Yunyu Shi Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences University of Science and Technology of China

The rpoS mRNA, which encodes the master regulator σS of general stress response, requires Hfq facilitated base-pairing with DsrA small RNA（sRNA） for translation at low temperatures. It has recently been proposed that one mechanism underlying Hfq action is to bridge a transient ternary complex by simultaneously binding to rpoS and DsrA. However, no structural evidence of Hfq simultaneously bound to different RNAs has been reported. We detected simultaneous binding of Hfq to rpoS and DsrA fragments. 1.8 A crystal structure of AU6A·Hfq·A7 ternary complex and 1.9 A crystal structure of Hfq·A7 complex have been resolved. Ternary complex has been further verified in solution NMR. Activating rpoS translation in vivo requires intact Hfq which bridges rpoS and DsrA simultaneously to form ternary complex. This ternary complex possibly corresponds to a meta-stable transition state in Hfq facilitated sRNA-mRNA annealing process.

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NMR backbone assignment of large proteins using 13Cα-only t...

NMR fragment screening hit induces plasticity of BRD7/9 bromodomains

第五届中国结构生物学学术讨论会

作者： Qingtao Wei Jiajing Chen Juan Mi Jiahai Zhang Ke Ruan jihui wu School of Life Science University of Science and Technology of China

Nuclear Magnetic Resonance（NMR） is powerful to interrogate protein structures and dynamics residue by residue at the atomic resolution but impeded in large proteins due to fast relaxation of NMR signals and difficult in backbone assignment. Though signals of 13Cα correlated triple resonance experiments are visible for medium or even very large proteins, the backbone assignment remains a great challenge because of the severe chemical shift degeneracy of 13Cα. Here, we present for the first time a back-fitting algorithm integrated with previously presented covariance NMR method to discriminate these 13Cα degenerated peaks by utilizing peak shape similarity along the common 13Cα dimension in pairs of triple resonance experiments as a new filter. Even for two fully degenerated 13Cα nuclei in spectra, the peak shapes can still be different based on their slightly chemical shift differences and local structural properties. Our algorithm identifies over 90% artificial peaks caused by chemical shift degeneracy and allows sequential backbone assignment in the covariance spectrum without precisely peak picking. The versatility and advantage of this approach is demonstrated in the backbone assignment of a 42 k Da maltose binding protein（MBP） complexed with β-cyclodextrin with a very high accuracy of 97.7% using only HN（CO）CA and HNCA experiments. Our results pave the way to study structures and dynamics of large proteins residue by residue.

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NMR fragment screening hit induces plasticity of BRD7/9 brom...

Mitosis-specific acetylation tunes Ran effector binding for chromosome segregation

第五届中国结构生物学学术讨论会

作者： Na Wang Fudong Li Hongyu Bao Jie Li jihui wu Ke Ruan Hefei National Laboratory for Physical Science at the Microscale School of Life SciencesUniversity of Science and Technology of China

The profound biology associated with BET bromodomain inhibition using chemical probes has attracted increasing attention for identification of new non-BET bromodomain inhibitors1. Several potent inhibitors to BRD9 bromodomain have been discovered and exhibited anti-cancer and antiinflammation activities very recently2,3, however, it remains unexploited regarding its paralog BRD7 bromodomain. Here, we identify new chemotypes targeting BRD7 bromodomain using NMR fragment based screening. BRD7 and BRD9 bromodomains exhibit similar patterns of chemical shift perturbations upon the titration of hit 1. The crystal structure demonstrates that hit 1 repels Y222 group of BRD9 bromodomain in a way similar to butyryllysine（Kbu） and crotonyllysine（Kcr）, but not the acetyl lysine（Kac） and known inhibitors. Rearrangement of residue F161 is observed for hit 1, KAc, Kbu and Kcr successively, which provides structural insight into the new generation of chemical probes to BRD7 bromodomain.

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Journal of Molecular Cell Biology 2018年第1期10卷 18-32页

作者： Xiaoling Bao Heng Liu Xing Liu Ke Ruan Yonshui Zhang Zhiyong Zhang Qi Hu Ying Liu Saima Akram Jiahai Zhang Qingguo Gong Wenwen wang Xiao Yuan Jian-Li Lingli Zhao Zhen Dou Ruijun Tian Xuebiao Yao jihui wu Yunyu Shi Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences University of Science and Technology of China Hefei 230027 China Center of Excellence in Molecular Ceil Sciences Chinese Academy of Sciences & Anhui Key Laboratory for Cellular Dynamics and Chemical Biology Hefei 230027 China Southern University of Science & Technology Shenzhen 518055 China Keck Center for Molecular Imaging Morehouse School of Medicine Atlanta GA 30310 USA

Stable transmission of genetic information during cell division requires faithful mitotic spindle assembly and chromosome segregation. The Ran GTPase plays a key role in mitotic spindle assembly. However, how the generation of a chemical gradient of Ran-GTP at the spindle is coupled to mitotic post-translational modifications has never been characterized. Here, we solved the complex structure of Ran with the nucleotide release factor Mogl and delineated a novel mitosis-specific acetylation-regulated Ran-Mogl interaction dur- ing chromosome segregation. Our structure-guided functional analyses revealed that Mogl compotes with RCCl for Ran binding in a GTP/GDP-dependent manner. Biochemical characterization demonstrated that Mogl-bound Ran prevents RCCl binding and subse- quent GTP loading. Surprisingly, Ran is a bono fide substrate of TIP60, and the acetylation of Lys134 by TIP60 liberates Mogl from Ran binding during mitosis. Importantly, this acetylation-elicited switch of Ran binding to RCC1 promotes high level of Ran-GTP, which is essential for chromosome alignment. These results establish a previously uncharacterized regulatory mechanism in which TIP60 pro- vides a homeostatic control of Ran-GTP level by tuning Ran effector binding for chromosome segregation in mitosis.

关键词： Ran-GTP Lys134 acetylation TIP60 mitosis chromosome segregation NMR