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Cheng S, Liang C, Geng P, Guo Z, Li Y, Zhang L, Shi G. Affinity adsorption of phospholipase A 1 with designed ligand binding to catalytic pocket. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1159:122402. [PMID: 33130354 DOI: 10.1016/j.jchromb.2020.122402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/23/2020] [Accepted: 10/06/2020] [Indexed: 01/10/2023]
Abstract
An affinity ligand was designed from 1-aminocyclohexane based on the crystal structure of Streptomyces albidoflavus phospholipase A1 (saPLA1) by using Discovery Studio software. The molecular docking results indicated that the designed ligand could interact with the active pocket of saPLA1. Epichlorohydrin, cyanuric chloride and 1-aminocyclohexane were used to synthesize the affinity ligand, which was composed to Sepharose beads. The density of the ligand on Sepharose beads was 22.5 ± 1.1 μmol/g wet gel. Adsorption analysis of the sorbent indicated the maximum adsorption (Qmax) of the enzyme was 10.7 ± 0.29 mg/g and the desorption constant (Kd) was 426.6 ± 29.7 μg/mL. The sorbent could bind the enzyme in the supernatant of disrupted recombinant Escherichia coli through one step of affinity adsorption. After the optimization of the purification process, a single band was obtained at approximately 30 kDa, which was confirmed as saPLA1 by the matrix-assisted laser desorption/ionization tandem time-of-flight (MALDI-TOF/TOF) mass spectrometry and activity assay. The purity of the isolated enzyme was about 96.6% with the purify fold at 7.62, and the activity recovery was 52.5%.
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Affiliation(s)
- Shi Cheng
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China
| | - Chaojuan Liang
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China
| | - Peng Geng
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China
| | - Zitao Guo
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China
| | - Youran Li
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China
| | - Liang Zhang
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China.
| | - Guiyang Shi
- The Key Laboratory of Industry Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, PR China; National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi 214122, Jiangsu, PR China
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Affinity adsorption of bovine hyaluronidase with ligands targeting to active site. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1092:422-431. [PMID: 29945106 DOI: 10.1016/j.jchromb.2018.06.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 06/15/2018] [Accepted: 06/15/2018] [Indexed: 01/10/2023]
Abstract
Four affinity ligands were designed from 6-chloromethyluracil and 2-aminobenzimidazole and simulated for the interaction with bovine hyaluronidase-1. Regarding sequence alignment, bovine hyaluronidase-1 precursor showed circa 83.6% similarity with human hyaluronidase-1. Regarding structural modeling and molecular docking, bovine hyaluronidase-1 interacted with ligands in the active site. Using epichlorohydrin, 1,3-propanediamine and cyanuric chloride as spacers, 6-chloromethyluracil and 2-aminobenzimidazole were composed to Sepharose beads. The modified Sepharose beads were then subjected to adsorption analysis with bovine hyaluronidase. After one step of affinity adsorption, the samples extracted from bovine testes were subjected to sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) analysis and activity assay. As calculated, the densities of four ligands on sorbents (entitled as L-1, L-2, L-3 and L-4) were 37.7 ± 2.3, 36.4 ± 3.2, 42.4 ± 4.2 and 33.7 ± 2.3 μmol/g wet gel; the theoretical maximum adsorption (Qmax) of bovine hyaluronidase on the four sorbents were 63.6 ± 1.6, 72.0 ± 0.7, 111.0 ± 4.1 and 121.7 ± 2.3 mg/g wet gel, respectively; the dissociation constants (Kd) of the four sorbents were 18.5 ± 0.8, 48.1 ± 4.3, 35.0 ± 3.0, 40.6 ± 2.7 μg/g wet gel, respectively. After optimization, the proteins captured by sorbents attaching 2-aminobenzimidazole based ligands (L-3 and L-4) revealed the main single band at approximately 50 kDa, and the purities were about 85.2 and 96.4%; the bioactivity recoveries were 83.5 and 89.4%. In addition, the bands on SDS-PAGE gel were also extracted and confirmed with linear trap quadropole mass spectrometry (LTQ-MS) analysis.
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Yip TF, Selim ASM, Lian I, Lee SMY. Advancements in Host-Based Interventions for Influenza Treatment. Front Immunol 2018; 9:1547. [PMID: 30042762 PMCID: PMC6048202 DOI: 10.3389/fimmu.2018.01547] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/22/2018] [Indexed: 12/15/2022] Open
Abstract
Influenza is a major acute respiratory infection that causes mortality and morbidity worldwide. Two classes of conventional antivirals, M2 ion channel blockers and neuraminidase inhibitors, are mainstays in managing influenza disease to lessen symptoms while minimizing hospitalization and death in patients with severe influenza. However, the development of viral resistance to both drug classes has become a major public health concern. Vaccines are prophylaxis mainstays but are limited in efficacy due to the difficulty in matching predicted dominant viral strains to circulating strains. As such, other potential interventions are being explored. Since viruses rely on host cellular functions to replicate, recent therapeutic developments focus on targeting host factors involved in virus replication. Besides controlling virus replication, potential targets for drug development include controlling virus-induced host immune responses such as the recently suggested involvement of innate lymphoid cells and NADPH oxidases in influenza virus pathogenesis and immune cell metabolism. In this review, we will discuss the advancements in novel host-based interventions for treating influenza disease.
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Affiliation(s)
- Tsz-Fung Yip
- HKU-Pasteur Research Pole, School of Public Health, The University of Hong Kong, Hong Kong, Hong Kong
| | - Aisha Sami Mohammed Selim
- HKU-Pasteur Research Pole, School of Public Health, The University of Hong Kong, Hong Kong, Hong Kong
| | - Ida Lian
- School of Life Sciences and Chemical Technology, Ngee Ann Polytechnic, Singapore, Singapore
| | - Suki Man-Yan Lee
- HKU-Pasteur Research Pole, School of Public Health, The University of Hong Kong, Hong Kong, Hong Kong
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