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Computational prediction integrating the inhibition kinetics of gallotannin on α-glucosidase
Yue, Li-Mei,Lee, Jinhyuk,Zheng, Li,Park, Yong-Doo,Ye, Zhuo-Ming,Yang, Jun-Mo Elsevier 2017 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.103 No.-
<P><B>Abstract</B></P> <P>Due to the finding that inhibition of α-glucosidase is directly associated with treatment of several diseases, the development of a selective inhibitor for targeting α-glucosidase is important. Gallotannin (GT) is a natural ingredient that has been used as a food additive and for medicinal applications. In this study, we performed a computational docking experiment involving the pre-simulation of the binding mechanism of GT, and the effect of GT on α-glucosidase was evaluated with inhibitory kinetics based on its polyphenol properties. The computational simulations indicated that the hydroxyl groups of GT interact with several residues near the α-glucosidase active site (Met69, Tyr71, Phe177, Arg212, Asp214, Glu276, His348, Asp349, and Arg439), which could affect the catalytic function of α-glucosidase by retarding substrate access. Subsequent kinetic experiments showed that GT conspicuously inhibited α-glucosidase in a parabolic mixed-type manner (<I>IC</I> <SUB>50</SUB> =1.31±0.03μM; <I>K<SUB>i</SUB> </I> =0.41±0.032μM). Our study provides insight into the inhibition mechanism and binding manner of GT to α-glucosidase. Based on its α-glucosidase-inhibiting effect and its demonstrated safety as a naturally derived compound, GT represents a promising potential agent for treatment of α-glucosidase-associated diseases.</P>
Zheng, Li,Lee, Jinhyuk,Yue, Li-Mei,Lim, Gyu Tae,Yang, Jun-Mo,Ye, Zhuo-Ming,Park, Yong-Doo Elsevier 2018 International journal of biological macromolecules Vol.112 No.-
<P><B>Abstract</B></P> <P>In this study we conducted serial kinetic studies integrated with computational simulations to judge the inhibitory effect of pyrogallol on α-glucosidase, due to the association between this enzyme and the treatment of type 2 diabetes. As a result, we found that pyrogallol bound to the active site of α-glucosidase, interacting with several key residues, such as ASP68, MET69, TYR71, PHE157, PHE158, PHE177, GLN181, HIS348, ASP349, ASP406, VAL407, ASP408, ARG439, and ARG443, which was predicted by performing a protein-ligand docking simulation. Subsequently, we evaluated the inhibitory effect of pyrogallol on α-glucosidase, and found that it induced a mixed type of inhibition in a reversible and quick-binding manner. The relevant kinetic parameters were evaluated to be: <I>IC</I> <SUB>50</SUB> =0.72±0.051mM; <I>K</I> <SUB>i</SUB> =0.37±0.018mM. A tertiary conformational change was synchronized with pyrogallol inhibition and modulation of the shape of the active site was correspondingly observed. Our study provides insight into the functional inhibitory role of pyrogallol, which results from its triple-hydroxyl groups interacting with the active site of α-glucosidase. We suggest that compounds similar to pyrogallol (phenolic hydroxyl compounds) which target the key residues of the active site of α-glucosidase could be potential agents for α-glucosidase inhibition.</P>
An in vitro Actinidia Bioassay to Evaluate the Resistance to Pseudomonas syringae pv. actinidiae
Wang, Faming,Li, Jiewei,Ye, Kaiyu,Liu, Pingping,Gong, Hongjuan,Jiang, Qiaosheng,Qi, Beibei,Mo, Quanhui The Korean Society of Plant Pathology 2019 Plant Pathology Journal Vol.35 No.4
Pseudomonas syringae pv. actinidiae (Psa) is by far the most important pathogen of kiwifruit. Sustainable expansion of the kiwifruit industry requires the use of Psa-tolerant or resistant genotypes for the breeding of tolerant cultivars. However, the resistance of most existing kiwifruit cultivars and wild genotypes is poorly understood, and suitable evaluation methods of Psa resistance in Actinidia have not been established. A unique in vitro method to evaluate Psa resistance has been developed with 18 selected Actinidia genotypes. The assay involved debarking and measuring the lesions of cane pieces inoculated with the bacterium in combination with the observation of symptoms such as callus formation, sprouting of buds, and the extent to which Psa invaded xylem. Relative Psa resistance or tolerance was divided into four categories. The division results were consistent with field observations. This is the first report of an in vitro assay capable of large-scale screening of Psa-resistance in Actinidia germplasm with high accuracy and reproducibility. The assay would considerably facilitate the breeding of Psa-resistant cultivars and provide a valuable reference and inspiration for the resistance evaluation of other plants to different pathogens.
Dong-Ming Mo,Liu-Zhu Cao,Li Zhang,Shuang Ye,You-Rong Li 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
We report a set of direct numerical simulation results on Rayleigh-BénardMarangoni (R-B-M) flow of cold water in the cylindrical pools. The heat transfer between the free surface and the environment is considered. The aspect ratio Г of the cylindrical pool varies from 2 to 8. Rayleigh (Ra) and Biot (Bi) numbers are respectively confined in Ra ≤ 10 4 and 0 < Bi ≤ 50. The flow onset critical Ra is determined and the influences of Bi and the density inversion parameter ( mΘ ) on the critical Ra are analyzed. The primary bifurcation flow structures of R-B-M flow are shown and the evolution of the flow structures with Ra and Bi at different mΘ is observed. Furthermore, the heat transfer ability is estimated by Nusselt number. The results indicate that the critical Ra of the flow onset increases with increasing Bi and Θ m . But it decreases with the increase of Г. The primary bifurcation pattern is multicellular flow. With increasing Г, the number of flow cells in multicellular flow increases fast. With increasing Ra, the up-triangular and up-quadrilateral flow structures appear at Г = 4, and finally transits to the up one-torus. With increasing Ra and Г, and decreasing Θ m , average Nusselt number increases monotonically. However, with increasing Bi, it first increases, and then decreases.
( Yue Qun Wang ),( Xiang Li Ye ),( Jun Mei Zhou ),( Yong Qi Wan ),( Hua Ping Xie ),( Yun Deng ),( Yan Yan ),( Yong Qing Li ),( Xiong Wei Fan ),( Wu Zhou Yuan ),( Xiao Yang Mo ),( Xiu Shan Wu ) 생화학분자생물학회(구 한국생화학분자생물학회) 2011 BMB Reports Vol.44 No.1
Zinc finger (ZNF) proteins play a critical role in cell growth, proliferation, apoptosis, and intracellular signal transduction. In this paper, we cloned and characterized a novel human KRAB-related zinc finger gene, ZNF425, which encodes a protein of 752 amino acids. ZNF425 is strongly expressed in the three month old human embryos and then is almost undetectable in six month old embryos and in adult tissues. An EGFP-ZNF425 fusion protein can be found in both the nucleus and the cytoplasm. ZNF425 appears to act as a transcription repressor. Over-expression of ZNF425 inhibits the transcriptional activities of SRE, AP-1, and SRF. Deletion analysis indicates that the C2H2 domain is the main region responsible for the repression. Our results suggest that the ZNF425 gene is a new transcriptional inhibitor that functions in the MAPK signaling pathway. [BMB reports 2011; 44(1): 58-63]
An in vitro Actinidia Bioassay to Evaluate the Resistance to Pseudomonas syringae pv. actinidiae
Faming Wang,Jiewei Li,Kaiyu Ye,Pingping Liu,Hongjuan Gong,Qiaosheng Jiang,Beibei Qi,Quanhui Mo 한국식물병리학회 2019 Plant Pathology Journal Vol.35 No.4
Pseudomonas syringae pv. actinidiae (Psa) is by far the most important pathogen of kiwifruit. Sustainable expansion of the kiwifruit industry requires the use of Psa-tolerant or resistant genotypes for the breeding of tolerant cultivars. However, the resistance of most existing kiwifruit cultivars and wild genotypes is poorly understood, and suitable evaluation methods of Psa resistance in Actinidia have not been established. A unique in vitro method to evaluate Psa resistance has been developed with 18 selected Actinidia genotypes. The assay involved debarking and measuring the lesions of cane pieces inoculated with the bacterium in combination with the observation of symptoms such as callus formation, sprouting of buds, and the extent to which Psa invaded xylem. Relative Psa resistance or tolerance was divided into four categories. The division results were consistent with field observations. This is the first report of an in vitro assay capable of large-scale screening of Psa-resistance in Actinidia germplasm with high accuracy and reproducibility. The assay would considerably facilitate the breeding of Psa-resistant cultivars and provide a valuable reference and inspiration for the resistance evaluation of other plants to different pathogens.
( Yun Deng ),( Yong Qing Li ),( Xiong Wei Fan ),( Wu Zhou Yuan ),( Hua Ping Xie ),( Xiao Yang Mo ),( Yan Yan ),( Jun Mei Zhou ),( Yue Qun Wang ),( Xian Li Ye ),( Yong Qi Wan ),( Xiu Shan Wu ) 생화학분자생물학회 (구 한국생화학분자생물학회) 2010 BMB Reports Vol.43 No.6
LBH is a transcription factor as a candidate gene for CHD associated with partial trisomy 2p syndrome. To identify potential LBH-interacting partners, a yeast two-hybrid screen using LBH as a bait was performed with a human heart cDNA library. One of the clones identified encodes αB-crystallin. Co-immunoprecipitation and GST pull-down assays showed that LBH interacts with αB-crystallin, which is further confirmed by mammalian two-hybrid assays. Co-localization analysis showed that in COS-7 cells, αB-crystallin that is cytoplasmic alone, accumulates partialy in the nucleus when co-transfected with LBH. Transient transfection assays indicated that overexpression of LBH or αB-crystallin reduced the transcriptional activities of p53 and p21, respectively, Overexpression of both αB-crystallin and LBH together resulted in a stronger repression of the transcriptional activities of p21 and p53. These results showed that the interaction of LBH and αB-crystallin may inhibit synergistically the transcriptional regulation of p53 and p21. [BMB reports 2010; 43(6): 432-437]
( Na Luo ),( Guan Li ),( Yong Qing Li ),( Xiong Wei Fan ),( Yue Qun Wang ),( Xiang Li Ye ),( Xiao Yan Mo ),( Jun Mei Zhou ),( Wu Zhou Yuan ),( Ming Tan ),( Hua Ping Xie ),( Karen Ocorr ),( Rolf Bodmer 생화학분자생물학회 (구 한국생화학분자생물학회) 2010 BMB Reports Vol.43 No.5
The sterile alpha motif (SAM) is a putative protein interaction domain involved in a wide variety of biological processes. Here we report the identification and characterization of a novel gene, SAMD4B, which encodes a putative protein of 694 amino acids with a SAM domain. Northern blot and RT-PCR analysis showed that SAMD4B is widely expressed in human embryonic and adult tissues. Transcriptional activity assays show SAMD4B suppresses transcriptional activity of L8G5-luciferase. Over-expression of SAMD4B in mammalian cells inhibited the transcriptional activities of activator protein-1 (AP-1), p53 and p21, and the inhibitory effects can be relieved by siRNA. Deletion analysis indicates that the SAM domain is the main region for transcriptional suppression. The results suggest that SAMD4B is a widely expressed gene involved in AP-1-, p53-and p21-mediated transcriptional signaling activity. [BMB reports 2010; 43(5): 355-361]
The Influence of Authentic Leadership on Psychological Safety in China
Meng-Tian Zhang,Myeong-Cheol Choi,Mo-Ye Li,Ying-Zi Yao,Hann-Earl Kim 국제문화기술진흥원 2021 International Journal of Advanced Culture Technolo Vol.9 No.4
In an environment that places a priority on morality, authentic leadership is becoming increasingly important. Chinese enterprises are putting a lot of effort into improving their employees’ psychological safety and positive psychological capital (PsyCap). This study examines the influence of authentic leadership on positive PsyCap and psychological safety, as well as the influence of positive PsyCap on psychological safety in China. It also examines whether positive PsyCap plays a mediating role. Authentic leadership has a positive effect on both positive PsyCap and psychological safety. Positive PsyCap also has a positive effect on psychological safety. Moreover, positive PsyCap had a mediation effect on the relationship between authentic leadership and psychological safety. This result means that an authentic leadership style can stimulate employees’ psychological capital, make the staff more confident and promote optimistic attitudes, hopeful minds, and plenty of other positive psychological states. At the same time, it promotes the psychological safety of employees in Chinese art enterprises. The significance of this study is that it investigates the effects and processes of authentic leadership on psychological safety and positive PsyCap in Chinese art enterprises. The implications of this research bridge a theoretical gap in the field, and provide feasible suggestions and guidance for development in the discipline. Enterprises should attach importance to the selection, cultivation, and appointment of authentic leaders. They must also pay attention to trends in employee psychological safety and positive PsyCap.