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Chen GQ, Li P, Yan Q, Wu YH, Wang HR, Chao SF, Wu LJ, Chen L, Feng GZ. Identification of Spodoptera frugiperda importin alphas that facilitate the nuclear import of Autographa californica multiple nucleopolyhedrovirus DNA polymerase. Insect Mol Biol 2021; 30:400-409. [PMID: 33837597 DOI: 10.1111/imb.12704] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 03/30/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
Proteins containing nuclear localization signals (NLSs) are actively transported into the nucleus via the classic importin-α/β-mediated pathway, and NLSs are recognized by members of the importin-α family. Most studies of insect importin-αs have focused on Drosophila to date, little is known about the importin-α proteins in Lepidoptera insects. In this study, we identified four putative importin-α homologues, Spodoptera frugiperda importin-α1 (SfIMA1), SfIMA2, SfIMA4 and SfIMA7, from Sf9 cells. Immunofluorescence analysis showed that SfIMA2, SfIMA4 and SfIMA7 localized to the nucleus, while SfIMA1 distributed in cytoplasm. Additionally, SfIMA4 and SfIMA7 were also detected in the nuclear membrane of Sf9 cells. SfIMA1, SfIMA4 and SfIMA7, but not SfIMA2, were found to associate with the C terminus of AcMNPV DNA polymerase (DNApol) that harbours a typical monopartite NLS and a classic bipartite NLS. Further analysis of protein-protein interactions revealed that SfIMA1 specifically recognizes the bipartite NLS, while SfIMA4 and SfIMA7 bind to both monopartite and bipartite NLSs. Together, our results suggested that SfIMA1, SfIMA4 and SfIMA7 play important roles in the nuclear import of AcMNPV DNApol C terminus in Sf9 cells.
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Affiliation(s)
- Guo-Qing Chen
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
| | - Pei Li
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Qing Yan
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
| | - Yi-Hong Wu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Hao-Ran Wang
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
| | - Shu-Fen Chao
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
| | - Li-Juan Wu
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
| | - Long Chen
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
| | - Guo-Zhong Feng
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, China
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2
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Toro TB, Painter RG, Haynes RA, Glotser EY, Bratton MR, Bryant JR, Nichols KA, Matthew-Onabanjo AN, Matthew AN, Bratcher DR, Perry CD, Watt TJ. Purification of metal-dependent lysine deacetylases with consistently high activity. Protein Expr Purif 2018; 141:1-6. [PMID: 28843507 PMCID: PMC5624855 DOI: 10.1016/j.pep.2017.08.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/28/2017] [Accepted: 08/22/2017] [Indexed: 11/25/2022]
Abstract
Metal-dependent lysine deacetylases (KDACs) are involved in regulation of numerous biological and disease processes through control of post-translational acetylation. Characterization of KDAC activity and substrate identification is complicated by inconsistent activity of prepared enzyme and a range of multi-step purifications. We describe a simplified protocol based on two-step affinity chromatography. The purification method is appropriate for use regardless of expression host, and we demonstrate purification of several representative members of the KDAC family as well as a selection of mutated variants. The purified proteins are highly active and consistent across preparations.
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Affiliation(s)
- Tasha B Toro
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Richard G Painter
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Rashad A Haynes
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Elena Y Glotser
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Melyssa R Bratton
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Jenae R Bryant
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Kyara A Nichols
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Asia N Matthew-Onabanjo
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Ashley N Matthew
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Derek R Bratcher
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Chanel D Perry
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
| | - Terry J Watt
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Dr., New Orleans, LA 70125-1098, USA.
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3
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Date SS, Fiori MC, Altenberg GA, Jansen M. Expression in Sf9 insect cells, purification and functional reconstitution of the human proton-coupled folate transporter (PCFT, SLC46A1). PLoS One 2017; 12:e0177572. [PMID: 28493963 PMCID: PMC5426777 DOI: 10.1371/journal.pone.0177572] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 04/28/2017] [Indexed: 01/05/2023] Open
Abstract
The proton-coupled folate transporter (PCFT) provides an essential uptake route for the vitamin folic acid (B9) in mammals. In addition, it is currently of high interest for targeting chemotherapeutic agents to tumors due to the increased folic acid requirement of rapidly dividing tumor cells as well as the upregulated PCFT expression in several tumors. To understand its function, determination of its atomic structure and molecular mechanism of transport are essential goals that require large amounts of functional PCFT. Here, we present a high-level heterologous expression system for human PCFT using a recombinant baculovirus and Spodoptera frugiperda (Sf9) insect cells. We demonstrate folate transport functionality along the PCFT expression, isolation, and purification process. Importantly, purified PCFT transports folic acid after reconstitution. We thus succeeded in overcoming heterologous expression as a major bottleneck of PCFT research. The availability of an overexpression system for human PCFT provides the basis for future biochemical, biophysical and structural studies.
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Affiliation(s)
- Swapneeta S. Date
- Department of Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
- Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
| | - Mariana C. Fiori
- Department of Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
- Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
| | - Guillermo A. Altenberg
- Department of Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
- Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
| | - Michaela Jansen
- Department of Cell Physiology and Molecular Biophysics, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
- Center for Membrane Protein Research, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States of America
- * E-mail:
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4
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Yang M, Wang B, Gao J, Zhang Y, Xu W, Tao L. Spinosad induces programmed cell death involves mitochondrial dysfunction and cytochrome C release in Spodoptera frugiperda Sf9 cells. Chemosphere 2017; 169:155-161. [PMID: 27870937 DOI: 10.1016/j.chemosphere.2016.11.065] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [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: 06/07/2016] [Revised: 10/22/2016] [Accepted: 11/12/2016] [Indexed: 06/06/2023]
Abstract
Spinosad, a reduced-risk insecticide, acts on the nicotinic acetylcholine receptors and the gamma-aminobutyric acid receptor in the nervous system of target insects. However, its mechanism of action in non-neural insect cells is unclear. This study aimed to evaluate mitochondrial functional changes associated with spinosad in Spodoptera frugiperda (Sf9) insect cells. Our results indicate that in Sf9 cells, spinosad induces programmed cell death and mitochondrial dysfunction through enhanced reactive oxygen species production, mitochondrial permeability transition pore (mPTP) opening, and mitochondrial membrane potential collapse, eventually leading to cytochrome C release and apoptosis. The cytochrome C release induced by spinosad treatment was partly inhibited by the mPTP inhibitors cyclosporin A and bongkrekic acid. Subsequently, we found that spinosad downregulated Bcl-2 expression and upregulated p53 and Bax expressions, activated caspase-9 and caspase-3, and triggered PARP cleavage in Sf9 cells. These findings suggested that spinosad-induced programmed cell death was modulated by mitochondrial dysfunction and cytochrome C release.
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Affiliation(s)
- Mingjun Yang
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Bo Wang
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Jufang Gao
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, China
| | - Yang Zhang
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Wenping Xu
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China
| | - Liming Tao
- Shanghai Key Lab of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai, 200237, China.
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Somrit M, Watthammawut A, Chotwiwatthanakun C, Weerachatyanukul W. The key molecular events during Macrobrachium rosenbergii nodavirus (MrNV) infection and replication in Sf9 insect cells. Virus Res 2016; 223:1-9. [PMID: 27327530 PMCID: PMC7126520 DOI: 10.1016/j.virusres.2016.06.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 06/16/2016] [Accepted: 06/17/2016] [Indexed: 01/01/2023]
Abstract
The successful infection and replication of MrNV in Sf9 cells should facilitate long-term and in-depth investigation of MrNV infection pathway. MrNV internalization favors caveolin (CAV)-mediated pathway which can be halted and reactivated by genistein and okadaic acid. Replication of MrNV (at 72 h p.i.) resulted in cytopathic effects (CPE) and multiplication of virion number in the infected cells.
In this study we demonstrated that Macrobrachium rosenbergii nodavirus (MrNV) was able to internalize and replicate in Sf9 insect cells, with levels of infection altered by substances affecting the caveolin-(CAV) mediated endocytosis pathway. The use of Sf9 cells for efficient MrNV replication and propagation was demonstrated by confocal microscopy and PCR amplification, through which early viral binding and internalization were initially detectable at 30 min post-infection; whereas at 72 h, the distinguishable sign of late-MrNV infection was observable as the gradual accumulation of a cytopathic effect (CPE) in the cells, ultimately resulting in cellular disruption. Moreover, during the early period of infection, the MrNV signals were highly co-localized with CAV1 signals of the CAV-mediated endocytosis pathway. The use of genistein as an inhibitor of the CAV-mediated endocytosis pathway significantly reduced MrNV and CAV1 co-localization, and also reduced the levels of MrNV infection in Sf9 cells as shown by PCR and ELISA. Moreover, the addition of the pathway agonist okadaic acid not only recovered but also augmented both the levels of MrNV co-localization with CAV1 and of Sf9 infection in the presence of genistein inhibition; therefore demonstrating that MrNV infection in Sf9 cells was associated with the CAV-mediated endocytosis pathway machinery.
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Affiliation(s)
- Monsicha Somrit
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand
| | - Atthaboon Watthammawut
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand
| | | | - Wattana Weerachatyanukul
- Department of Anatomy, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand.
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Ladd Effio C, Wenger L, Ötes O, Oelmeier SA, Kneusel R, Hubbuch J. Downstream processing of virus-like particles: single-stage and multi-stage aqueous two-phase extraction. J Chromatogr A 2015; 1383:35-46. [PMID: 25637013 DOI: 10.1016/j.chroma.2015.01.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Revised: 01/05/2015] [Accepted: 01/06/2015] [Indexed: 12/31/2022]
Abstract
The demand for vaccines against untreated diseases has enforced the research and development of virus-like particle (VLP) based vaccine candidates in recent years. Significant progress has been made in increasing VLP titres during upstream processing in bacteria, yeast and insect cells. Considering downstream processing, the separation of host cell impurities is predominantly achieved by time-intensive ultracentrifugation processes or numerous chromatography and filtration steps. In this work, we evaluate the potential of an alternative separation technology for VLPs: aqueous two-phase extraction (ATPE). The benefits of ATPE have been demonstrated for various biomolecules, but capacity and separation efficiency were observed to be low for large biomolecules such as VLPs or viruses. Both performance parameters were examined in detail in a case study on human B19 parvovirus-like particles derived from Spodoptera frugiperda Sf9 insect cells. A solubility-guided approach enabled the design of polyethylene (PEG) salt aqueous two-phase systems with a high capacity of up to 4.1mg/mL VLPs. Unique separation efficiencies were obtained by varying the molecular weight of PEG, the pH value and by using neutral salt additives. Further improvement of the separation of host cell impurities was achieved by multi-stage ATPE on a centrifugal partition chromatography (CPC) device in 500mL scale. While single-stage ATPE enabled a DNA clearance of 99.6%, multi-stage ATPE improved the separation of host cell proteins (HCPs). The HPLC purity ranged from 16.8% (100% VLP recovery) for the single-stage ATPE to 69.1% (40.1% VLP recovery) for the multi-stage ATPE. An alternative two-step downstream process is presented removing the ATPS forming polymer, cell debris and 99.77% DNA with a HPLC purity of 90.6% and a VLP recovery of 63.9%.
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Affiliation(s)
- Christopher Ladd Effio
- Karlsruhe Institute of Technology, Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe, Germany
| | - Lukas Wenger
- Karlsruhe Institute of Technology, Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe, Germany
| | - Ozan Ötes
- Karlsruhe Institute of Technology, Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe, Germany
| | - Stefan A Oelmeier
- Karlsruhe Institute of Technology, Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe, Germany; Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach, Germany
| | | | - Jürgen Hubbuch
- Karlsruhe Institute of Technology, Institute of Process Engineering in Life Sciences, Section IV: Biomolecular Separation Engineering, Karlsruhe, Germany.
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7
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Ren Y, Chen D, Guo Y, Shi H, Liu J, Ban J, Liu Y, Wu X, Wang W, Cheng H, Li D, Liu Y, Wang L. [Expression of human retinol-binding protein 4 in insect baculovirus system and preparation of its polyclonal antibody]. Sheng Wu Gong Cheng Xue Bao 2013; 29:974-985. [PMID: 24195364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To prepare recombinant human retinol binding protein 4 (RBP4) by using the baculovirus expression system and to detect its immunogenicity, the fusion DNA fragment of secretory signal peptide SS64 and human RBP4 gene was subcloned into a baculovirus transfer vector pFastBac-dual(pFBd), and the corresponding recombinant transfer plasmid was transformed into E. coli strain DH10bac, after transposition recombinant shuttle bacmid was screened out. The logarithmic phase Sf9 cells were transfected with the recombinant bacmid and then the recombinant baculovirus containing hRBP4 expression box were generated. After amplification of recombinant baculovirus, the recombinant baculovirus seeds were obtained. To express human RBP4, logarithmic phase Sf9 cells were infected with the virus seeds and SDS-PAGE and Western blotting were used to detect and identify the expression. Finally, to prepare a batch of RBP4 protein, logarithmic phase Sf9 cells in suspension culture were infected with recombinant baculovirus seeds and the supernatant was harvested after 120 hours post-infection for purification. Finally for preparation of polyclonal antibody and evaluation of immunogenicity, the recombinant hRBP4 from insect cells and from E. coli were immunized rabbits. Restriction enzyme digestion and sequencing confirmed that the recombinant baculovirus transfer plasmid was constructed correctly, and subsequently recombinant RBP4-bacmid was generated successfully. SDS-PAGE and Western blotting analysis suggested that human RBP4 protein was highly expressed in Sf9 cells with the molecular weight of approximately 23 kDa. The recombinant RBP4 protein could be secreted into the medium efficiently, and the expression level was calculated amount of 100 mg/L. Finally the rabbit antiserum was harvested after recombinant RBP4 immunization, therein the titer of antiserum against baculovirus recombinant RBP4 is 1:100 000 whereas the titer of antiserum against E. coli recombinant RBP4 is only 1:10 000. Overall, human RBP4 was high efficiently expressed successfully with good antigenicity in baculovirus system, and high affinity antiserum was obtained. A solid foundation was laid for the next step of the preparation of human serum RBP4 detection kit.
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Affiliation(s)
- Yuying Ren
- ABZYMO Bioscience, Beijing 100176, China
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