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Dong CL, Che RX, Wu T, Qu QW, Chen M, Zheng SD, Cai XH, Wang G, Li YH. New Characterization of Multi-Drug Resistance of Streptococcus suis and Biofilm Formation from Swine in Heilongjiang Province of China. Antibiotics (Basel) 2023; 12:antibiotics12010132. [PMID: 36671333 PMCID: PMC9854593 DOI: 10.3390/antibiotics12010132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 01/12/2023] Open
Abstract
The aim of this study was to investigate the antimicrobial resistance profiles and genotypes of Streptococcus suis in Heilongjiang Province, China. A total of 29 S. suis were isolated from 332 samples collected from 6 pig farms. The results showed that serotypes 2, 4 and 9 were prevalent, and all the clinical isolates were resistant to at least two antibacterial drugs. The most resisted drugs were macrolides, and the least resisted drugs were fluoroquinolones. Resistant genes ermB and aph (3')-IIIa were highly distributed among the isolates, with the detection rates of 79.31% and 75.86%. The formation of biofilm could be observed in all the isolated S. suis, among which D-1, LL-1 and LL-3 strains formed stronger biofilm structure than other strains. The results indicate that S. suis in Heilongjiang Province presents a multi-drug resistance to commonly used antimicrobial drugs, which was caused by the same target gene, the dissemination of drug resistance genes, and bacterial biofilm.
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Affiliation(s)
- Chun-Liu Dong
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
- Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin 150038, China
| | - Rui-Xiang Che
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
- College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163318, China
| | - Tong Wu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
| | - Qian-Wei Qu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
| | - Mo Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
| | - Si-Di Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
| | - Xue-Hui Cai
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150008, China
| | - Gang Wang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150008, China
- Department of Basic Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian 271002, China
- Correspondence: (G.W.); (Y.-H.L.)
| | - Yan-Hua Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150038, China
- Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin 150038, China
- Correspondence: (G.W.); (Y.-H.L.)
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2
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Xing C, Cui WQ, Zhang Y, Zou XS, Hao JY, Zheng SD, Wang TT, Wang XZ, Wu T, Liu YY, Chen XY, Yuan SG, Zhang ZY, Li YH. Ultrasound-assisted deep eutectic solvents extraction of glabridin and isoliquiritigenin from Glycyrrhiza glabra: Optimization, extraction mechanism and in vitro bioactivities. Ultrason Sonochem 2022; 83:105946. [PMID: 35151194 PMCID: PMC8844873 DOI: 10.1016/j.ultsonch.2022.105946] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 01/22/2022] [Accepted: 02/03/2022] [Indexed: 05/04/2023]
Abstract
Licorice (Glycyrrhiza glabra) is extensively used owing to the superior pharmacological effects. However, its maximum application potential has not been fully exploited due to the limitation of currently available extraction solvent and methods. In this study, an eco-friendly deep eutectic solvent (NADESs) based ultrasound-assisted extraction (DES-UAE) method was applied to prepare licorice extracts. The DES-UAE using choline chloride and lactic acid as solvent was optimized and modeled by using response surface methodology to maximize the extraction yields of glabridin (GLA) and isoliquiritigenin (ISL). The optimized extracts possessed higher contents of GLA and ISL than available extraction methods, and the enriched products showed superior pharmacological activities in vitro. Furthermore, scanning electron microscopy (SEM) and molecular dynamic simulation analyses were performed to deeply investigate the interaction between solvent and targeted compounds. This study not only provides an eco-friendly method for high-efficient extraction of GLA and ISL from licorice but also illustrates the mechanism of the increased extraction efficacy, which may contribute to the application of licorice and deep insight into extraction mechanism using DES.
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Affiliation(s)
- Chen Xing
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Wen-Qiang Cui
- Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yue Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xin-Shu Zou
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Jing-You Hao
- Harbin Lvdasheng Animal Medicine Manufacture Co., Ltd, China
| | - Si-Di Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Ting-Ting Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xiao-Zhen Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Tong Wu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yan-Yan Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xue-Ying Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Shu-Guang Yuan
- Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Zhi-Yun Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China.
| | - Yan-Hua Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, China; Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China; Harbin Herb& Herd Bio-Technology Co., Ltd, China.
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3
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Zheng SD, Zhang ZY, Ma JX, Qu QW, God'spowe BO, Qin Y, Chen XY, Li LU, Zhou DF, Ding WY, Li YH. CD-g-CS nanoparticles for enhanced antibiotic treatment of Staphylococcus xylosus infection. Microb Biotechnol 2021; 15:535-547. [PMID: 34180582 PMCID: PMC8867972 DOI: 10.1111/1751-7915.13870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Revised: 06/02/2021] [Accepted: 06/06/2021] [Indexed: 11/30/2022] Open
Abstract
Staphylococcus xylosus (S. xylosus)‐induced cow mastitis is an extremely serious clinical problem. However, antibiotic therapy does not successfully treat S. xylosus infection because these bacteria possess a strong biofilm formation ability, which significantly reduces the efficacy of antibiotic treatments. In this study, we developed ceftiofur‐loaded chitosan grafted with β‐cyclodextrins (CD‐g‐CS) nanoparticles (CT‐NPs) using host–guest interaction. These positively charged nanoparticles improved bacterial internalization, thereby significantly improving the effectiveness of antibacterial treatments for planktonic S. xylosus. Moreover, CT‐NPs effectively inhibited biofilm formation and eradicated mature biofilms. After mammary injection in a murine model of S. xylosus‐induced mastitis, CT‐NPs significantly reduced bacterial burden and alleviated inflammation, thereby achieving optimized therapeutic efficiency for S. xylosus infection. In conclusion, this treatment strategy could improve the efficiency of antibiotic therapeutics and shows great potential in the treatment of S. xylosus infections.
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Affiliation(s)
- Si-Di Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - Zhi-Yun Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - Jin-Xin Ma
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - Qian-Wei Qu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - Bello-Onaghise God'spowe
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - Yue Qin
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - Xue-Ying Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
| | - L U Li
- College of Life Science, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China
| | - Dong-Fang Zhou
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Wen-Ya Ding
- Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China.,School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, China
| | - Yan-Hua Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, Heilongjiang, 150030, China
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Dong CL, Zheng SD, Liu YY, Cui WQ, Hao MQ, God'spower BO, Chen XY, Li YH. Albendazole solid dispersions prepared using PEG6000 and Poloxamer188: formulation, characterization and in vivo evaluation. Pharm Dev Technol 2020; 25:1043-1052. [PMID: 32546042 DOI: 10.1080/10837450.2020.1783553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
This study aimed to optimize the preparation process of albendazole (ABZ) solid dispersion (SD) and enhance its dissolution rate and oral bioavailability in dogs. The ABZ-SD formulations were prepared by a fusion method with ABZ and polyethylene glycol 6000 (PEG 6000), poloxamer 188 (P 188) polymers at various weight ratios or the combination of PEG 6000&P 188. The characterizations of the optimal formulations were performed by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), in vitro dissolution test and molecular docking. The in vivo pharmacokinetic study was conducted in beagle dogs. As a result, ABZ solid dispersion based on PEG 6000&P 188 (1:2) was successfully prepared. The ABZ-SD formulation could significantly improve the apparent solubility and dissolution rate of ABZ compared with commercial tablets. Furthermore, the water solubility of ABZ-SD was improved mainly based on hydrogen bond association. Besides, at an oral dosage of 15 mg/kg ABZ, the SDs had higher Cmax values and areas under the curve (AUCs) compared to those of commercial ABZ tablets. Preparation of ABZ-loaded SDs by PEG 6000&P 188 is a promising strategy to improve the oral bioavailability of ABZ.
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Affiliation(s)
- Chun-Liu Dong
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Si-Di Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yan-Yan Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Wen-Qiang Cui
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Mei-Qi Hao
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Bello-Onaghise God'spower
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xue-Ying Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yan-Hua Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
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Cui WQ, Qu QW, Wang JP, Bai JW, Bello-Onaghise G, Li YA, Zhou YH, Chen XR, Liu X, Zheng SD, Xing XX, Eliphaz N, Li YH. Discovery of Potential Anti-infective Therapy Targeting Glutamine Synthetase in Staphylococcus xylosus. Front Chem 2019; 7:381. [PMID: 31214565 PMCID: PMC6558069 DOI: 10.3389/fchem.2019.00381] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 05/10/2019] [Indexed: 12/21/2022] Open
Abstract
Glutamine synthetase (GS), which catalyzes the production of glutamine, plays essential roles in most biological growth and biofilm formation, suggesting that GS may be used as a promising target for antibacterial therapy. We asked whether a GS inhibitor could be found as an anti-infective agent of Staphylococcus xylosus (S. xylosus). Here, computational prediction followed by experimental testing was used to characterize GS. Sorafenib was finally determined through computational prediction. In vitro experiments showed that sorafenib has an inhibitory effect on the growth of S. xylosus by competitively occupying the active site of GS, and the minimum inhibitory concentration was 4 mg/L. In vivo experiments also proved that treatment with sorafenib significantly reduced the levels of TNF-α and IL-6 in breast tissue from mice mastitis, which was further confirmed by histopathology examination. These findings indicated that sorafenib could be utilized as an anti-infective agent for the treatment of infections caused by S. xylosus.
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Affiliation(s)
- Wen-Qiang Cui
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Qian-Wei Qu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Jin-Peng Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Jing-Wen Bai
- College of Science, Northeast Agricultural University, Harbin, China
| | - God'spower Bello-Onaghise
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yu-Ang Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yong-Hui Zhou
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xing-Ru Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xin Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Si-Di Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xiao-Xu Xing
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Nsabimana Eliphaz
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yan-Hua Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
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Ding WY, Zheng SD, Qin Y, Yu F, Bai JW, Cui WQ, Yu T, Chen XR, Bello-Onaghise G, Li YH. Chitosan Grafted With β-Cyclodextrin: Synthesis, Characterization, Antimicrobial Activity, and Role as Absorbefacient and Solubilizer. Front Chem 2019; 6:657. [PMID: 30687698 PMCID: PMC6335354 DOI: 10.3389/fchem.2018.00657] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 12/18/2018] [Indexed: 11/13/2022] Open
Abstract
We synthesized chitosan grafted with β-cyclodextrin (CD-g-CS) from mono-6-deoxy-6-(p-toluenesulfonyl)-β-cyclodextrin and chitosan. Two different amounts of immobilized β-cyclodextrin (β-CD) on CD-g-CS (QCD: 0.643 × 103 and 0.6 × 102 μmol/g) were investigated. The results showed that the amino contents of CD-g-CS with QCD = 0.643 × 103 and 0.6 × 102 μmol/g were 6.34 ± 0.072 and 9.41 ± 0.055%, respectively. Agar diffusion bioassay revealed that CD-g-CS (QCD = 0.6 × 102 μmol/g) was more active against Staphylococcus xylosus and Escherichia coli than CD-g-CS (QCD = 0.643 × 103 μmol/g). Cell membrane integrity tests and scanning electron microscopy observation revealed that the antimicrobial activity of CD-g-CS was attributed to membrane disruption and cell lysis. Uptake tests showed that CD-g-CS promoted the uptake of doxorubicin hydrochloride by S. xylosus, particularly for CD-g-CS with QCD = 0.6 × 102 μmol/g, and the effect was concentration dependent. CD-g-CS (QCD = 0.6 × 102 and 0.643 × 103 μmol/g) also improved the aqueous solubilities of sulfadiazine, sulfamonomethoxine, and sulfamethoxazole. These findings provide a clear understanding of CD-g-CS and are of great importance for reducing the dosage of antibiotics and antibiotic residues in animal-derived foods. The results also provide a reliable, direct, and scientific theoretical basis for its wide application in the livestock industry.
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Affiliation(s)
- Wen-Ya Ding
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China.,Northeastern Science Inspection Station, China Ministry of Agriculture Key Laboratory of Animal Pathogen Biology, Northeast Agricultural University, Harbin, China
| | - Si-Di Zheng
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yue Qin
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Fei Yu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Jing-Wen Bai
- College of Science, Northeast Agricultural University, Harbin, China
| | - Wen-Qiang Cui
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Tao Yu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Xing-Ru Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - God'spower Bello-Onaghise
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
| | - Yan-Hua Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Harbin, China
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Abstract
Two hemorrhagic proteases, Lachesis hemorrhagic toxins a and b (LHTa and LHTb), were isolated from the venom of Lachesis muta, which is distributed in Central and South America. One protease showed strong hemorrhagic action, while the other showed weak hemorrhagic activity even though the two enzymes are very similar in their chemical properties. Neither enzyme hydrolyzed arginine esters, but both hydrolyzed casein and reduced fibrinogen. The A alpha chain of fibrinogen was hydrolyzed first, and the B beta chain was hydrolyzed later. The gamma chain of fibrinogen was resistant to hydrolysis. The molecular weights of LHTa and LHTb were very similar, 22,000 and 23,000, respectively. The amino acid composition of LHTa was also similar to that of LHTb. The secondary structure of LHTa as determined by Lippert's equation was 52% alpha helix, 17% beta sheet, and 31% random coil; that of LHTb was 47% alpha helix, 13% beta sheet, and 40% random coil.
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Affiliation(s)
- Y L Ran
- Department of Biochemistry, Colorado State University, Fort Collins 80523
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