101
|
Gopanenko AV, Kolobova AV, Tupikin AE, Kabilov MR, Malygin AA, Karpova GG. Knockdown of the Ribosomal Protein eL38 in HEK293 Cells Changes the Translational Efficiency of Specific Genes. Int J Mol Sci 2021; 22:ijms22094531. [PMID: 33926116 PMCID: PMC8123606 DOI: 10.3390/ijms22094531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/22/2021] [Accepted: 04/24/2021] [Indexed: 11/23/2022] Open
Abstract
The protein eL38 is one of the smallest proteins of the mammalian ribosome, which is a component of its large (60S) subunit. The haploinsufficiency of eL38 in mice leads to the Tail-short mutant phenotype characterized by defects in the development of the axial skeleton caused by the poor translation of mRNA subsets of Hox genes. Using the ribosome profiling assay applied to HEK293 cells knocked down of eL38, we examined the effects of the lack of eL38 in 60S subunits on gene expression at the level of translation. A four-fold decrease in the cell content of eL38 was shown to result in significant changes in the translational efficiencies of 150 genes. Among the genes, whose expression at the level of translation was enhanced, there were mainly those associated with basic metabolic processes; namely, translation, protein folding, chromosome organization, splicing, and others. The set of genes with reduced translation efficiencies contained those that are mostly involved in the processes related to the regulation of transcription, including the activation of Hox genes. Thus, we demonstrated that eL38 insufficiency significantly affects the expression of certain genes at the translational level. Our findings facilitate understanding the possible causes of some anomalies in eL38-deficient animals.
Collapse
|
102
|
Ko YH, Chun J, Kim DH. Functional Analysis of an Essential GSP1/Ran Ortholog Gene, CpRan1, from the Chestnut Blight Fungus Cryphonectria parasitica Using a Heterokaryon. J Fungi (Basel) 2021; 7:jof7050332. [PMID: 33923059 PMCID: PMC8146580 DOI: 10.3390/jof7050332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/17/2021] [Accepted: 04/22/2021] [Indexed: 11/16/2022] Open
Abstract
Functional analysis of a GSP1/Ran ortholog, CpRan1, from Cryphonectria parasitica was conducted. Genotype analysis revealed that the putative CpRan1-null mutant was a heterokaryotic transformant harboring two different types of nuclei, one with the wild-type CpRan1 allele and the other with the CpRan1-null mutant allele. The mycelial growth and colony morphology of the heterokaryotic transformant was normal. Microscopic analysis of the resulting conidia (aseptate and monokaryotic asexual spores) demonstrated that although normal germinating spores were observed from conidia harboring a nucleus with the wild-type CpRan1 allele, a number of residual conidia that did not germinate existed. Complementation analysis using protoplasts from the heterokaryon with the wild-type CpRan1 allele confirmed that the CpRan1 gene is essential to C. parasitica. Complementation analysis using the various CpRan1 chimera constructs allowed us to perform a functional analysis of essential amino acids of the CpRan1. Among the four suggested essential amino acids, Lys-97 for ubiquitination was determined to not be an essential residue. Moreover, the CpRan1-null mutant allele was successfully complemented with mouse Ran gene, which suggested that the biological function of Ran gene is evolutionary conserved and that our heterokaryon rescue can be applied for the functional analysis of heterologous genes.
Collapse
Affiliation(s)
| | | | - Dae-Hyuk Kim
- Correspondence: ; Tel.: +82-63-270-3440; Fax: +82-63-270-4312
| |
Collapse
|
103
|
Tang Z, Luo W, Huang Z, Yuan M, Wu W, Yang K. Spodoptera frugiperda mRNA export factor interacts with and mediates the nuclear import of Autographa californica multiple nucleopolyhedrovirus ORF34 (Ac34). Virus Res 2021; 299:198438. [PMID: 33901592 DOI: 10.1016/j.virusres.2021.198438] [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: 03/11/2021] [Revised: 04/16/2021] [Accepted: 04/20/2021] [Indexed: 01/01/2023]
Abstract
Autographa californica multiple nucleopolyhedrovirus orf34 (ac34) is one of the unique genes of alphabaculoviruses. For successful alphabaculovirus replication, viral proteins must be transported to the nucleus. Our previous study showed that the nuclear localization of Ac34 was required for optimal production of budded virions. To investigate the mechanism of Ac34 nuclear import, mass spectrometric analysis was performed to identify potential proteins that may be involved in the nuclear import of Ac34. The result indicated that Spodoptera frugiperda mRNA export factor (SfMEF) may interact with Ac34 during baculovirus infection. Co-immunoprecipitation assays confirmed that Ac34 could interact with SfMEF in the absence of other baculovirus proteins. The deletion of ac34 did not affect the subcellular localization of SfMEF; however, knocking down Sfmef prevented the nuclear import of Ac34 in virus-infected cells. The mutations of C116 or C119 in a potential CCCH zinc finger motif (C116-X2-C119-X8-C128-X2-H131) of Ac34 led to an exclusive cytoplasmic distribution of Ac34, in consistent with our previous finding of mutations of C128 or H131 in this motif. Co-immunoprecipitation analysis showed that the above mutations in the potential zinc finger motif disrupted the interaction between Ac34 and SfMEF, and the loss of the interaction resulted in decreased BV production. Our findings demonstrated that SfMEF interacts with and mediates the nuclear import of Ac34, which is a new nucleocytoplasmic transport pathway used by alphabaculovirus to achieve successful viral replication within the nucleus of the infected cells.
Collapse
Affiliation(s)
- Zhimin Tang
- State Key Lab of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Wangtai Luo
- State Key Lab of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Zhihong Huang
- State Key Lab of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Meijin Yuan
- State Key Lab of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Wenbi Wu
- State Key Lab of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Kai Yang
- State Key Lab of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| |
Collapse
|
104
|
De Jesús-González LA, Palacios-Rápalo S, Reyes-Ruiz JM, Osuna-Ramos JF, Cordero-Rivera CD, Farfan-Morales CN, Gutiérrez-Escolano AL, del Ángel RM. The Nuclear Pore Complex Is a Key Target of Viral Proteases to Promote Viral Replication. Viruses 2021; 13:v13040706. [PMID: 33921849 PMCID: PMC8073804 DOI: 10.3390/v13040706] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/13/2021] [Accepted: 04/16/2021] [Indexed: 12/17/2022] Open
Abstract
Various viruses alter nuclear pore complex (NPC) integrity to access the nuclear content favoring their replication. Alteration of the nuclear pore complex has been observed not only in viruses that replicate in the nucleus but also in viruses with a cytoplasmic replicative cycle. In this last case, the alteration of the NPC can reduce the transport of transcription factors involved in the immune response or mRNA maturation, or inhibit the transport of mRNA from the nucleus to the cytoplasm, favoring the translation of viral mRNAs or allowing access to nuclear factors necessary for viral replication. In most cases, the alteration of the NPC is mediated by viral proteins, being the viral proteases, one of the most critical groups of viral proteins that regulate these nucleus–cytoplasmic transport changes. This review focuses on the description and discussion of the role of viral proteases in the modification of nucleus–cytoplasmic transport in viruses with cytoplasmic replicative cycles and its repercussions in viral replication.
Collapse
|
105
|
Kalita J, Kapinos LE, Lim RYH. On the asymmetric partitioning of nucleocytoplasmic transport - recent insights and open questions. J Cell Sci 2021; 134:239102. [PMID: 33912945 DOI: 10.1242/jcs.240382] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Macromolecular cargoes are asymmetrically partitioned in the nucleus or cytoplasm by nucleocytoplasmic transport (NCT). At the center of this activity lies the nuclear pore complex (NPC), through which soluble factors circulate to orchestrate NCT. These include cargo-carrying importin and exportin receptors from the β-karyopherin (Kapβ) family and the small GTPase Ran, which switches between guanosine triphosphate (GTP)- and guanosine diphosphate (GDP)-bound forms to regulate cargo delivery and compartmentalization. Ongoing efforts have shed considerable light on how these soluble factors traverse the NPC permeability barrier to sustain NCT. However, this does not explain how importins and exportins are partitioned in the cytoplasm and nucleus, respectively, nor how a steep RanGTP-RanGDP gradient is maintained across the nuclear envelope. In this Review, we peel away the multiple layers of control that regulate NCT and juxtapose unresolved features against known aspects of NPC function. Finally, we discuss how NPCs might function synergistically with Kapβs, cargoes and Ran to establish the asymmetry of NCT.
Collapse
Affiliation(s)
- Joanna Kalita
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, Basel CH4056, Switzerland
| | - Larisa E Kapinos
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, Basel CH4056, Switzerland
| | - Roderick Y H Lim
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, Basel CH4056, Switzerland
| |
Collapse
|
106
|
Li M, Xu Z, Zou X, Wang Y, Li Y, Ou X, Deng Y, Guo Y, Gan W, Chen D, Peng T, Xiao J, Cai M. Intracellular distribution of pseudorabies virus UL2 and detection of its nuclear import mechanism. Biol Chem 2021; 401:309-317. [PMID: 31665103 DOI: 10.1515/hsz-2019-0311] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 10/10/2019] [Indexed: 11/15/2022]
Abstract
Pseudorabies virus (PRV) UL2 (pUL2) is a multifunctional protein, which is homologous with herpes simplex virus 1 early protein UL2 (hUL2) and crucial for the viral propagation. Yet, how pUL2 executes its roles in the viral life cycle remain inadequately understood. In order to uncover its effect on the procedure of PRV infection, investigation was performed to examine the subcellular distribution of pUL2 and establish its trafficking mechanism. In the present study, enhanced yellow fluorescent protein or Myc tag fused pUL2 was transiently overexpressed in transfected cells and exhibited an absolutely nuclear accumulation without the existence of other PRV proteins. Additionally, the nuclear trafficking of pUL2 was proved to rely on Ran-, transportin-1, importin β1, importin α1, α3 and α5. Accordingly, these data will benefit the knowledge of pUL2-mediated biological effects in PRV infection cycle.
Collapse
Affiliation(s)
- Meili Li
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Zuo Xu
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Xingmei Zou
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Yuanfang Wang
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Yiwen Li
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Xiaowen Ou
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Yangxi Deng
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Yingjie Guo
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Weidong Gan
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Daixiong Chen
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Tao Peng
- State Key Laboratory of Respiratory Diseases, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, Xinzao Town, Panyu, Guangzhou 511436, Guangdong, China.,South China Vaccine Corporation Limited, Guangzhou Science Park, Guangzhou 510663, Guangdong, China
| | - Jing Xiao
- State Key Laboratory of Respiratory Diseases, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, Xinzao Town, Panyu, Guangzhou 511436, Guangdong, China
| | - Mingsheng Cai
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| |
Collapse
|
107
|
Markiewicz Ł, Uśpieński T, Baran B, Niedziółka SM, Niewiadomski P. Xpo7 negatively regulates Hedgehog signaling by exporting Gli2 from the nucleus. Cell Signal 2021; 80:109907. [PMID: 33383157 DOI: 10.1016/j.cellsig.2020.109907] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/22/2020] [Accepted: 12/27/2020] [Indexed: 01/01/2023]
Abstract
Dynamic bidirectional transport between the nucleus and the cytoplasm is critical for the regulation of many transcription factors, whose levels inside the nucleus must be tightly controlled. Efficient shuttling across the nuclear membrane is especially crucial with regard to the Hedgehog (Hh) pathway, where the transcriptional signal depends on the fine balance between the amounts of Gli protein activator and repressor forms in the nucleus. The nuclear export machinery prevents the unchecked nuclear accumulation of Gli proteins, but the mechanistic insight into this process is limited. We show that the atypical exportin Xpo7 functions as a major nuclear export receptor that actively excludes Gli2 from the nucleus and controls the outcome of Hh signaling. We show that Xpo7 interacts with several domains of Gli2 and that this interaction is modulated by SuFu, a key negative regulator of Hh signaling. Our data pave the way for a more complete understanding of the nuclear shuttling of Gli proteins and the regulation of their transcriptional activity.
Collapse
Affiliation(s)
- Łukasz Markiewicz
- Laboratory of Molecular and Cellular Signaling, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Tomasz Uśpieński
- Laboratory of Molecular and Cellular Signaling, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Brygida Baran
- Laboratory of Molecular and Cellular Signaling, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Sylwia M Niedziółka
- Laboratory of Molecular and Cellular Signaling, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Paweł Niewiadomski
- Laboratory of Molecular and Cellular Signaling, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland.
| |
Collapse
|
108
|
Fujioka D, Watanabe Y, Nakamura T, Yokoyama T, Miyazawa K, Murakami M, Kugiyama K. Group V Secretory Phospholipase A 2 Regulates Endocytosis of Acetylated LDL by Transcriptional Activation of PGK1 in RAW264.7 Macrophage Cell Line. J Atheroscler Thromb 2021; 29:692-718. [PMID: 33775979 PMCID: PMC9135649 DOI: 10.5551/jat.62216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
AIMS It was suggested that group V secretory phospholipase A2 (sPLA2-V) existed in the nucleus. This study examined whether nuclear sPLA2-V plays a role in endocytosis of acetylated low-density lipoprotein (AcLDL) in monocyte/macrophage-like cell line RAW264.7 cells. METHODS RAW264.7 cells were transfected with shRNA vector targeting sPLA2-V (sPLA2-V-knockdown [KD] cells) or empty vector (sPLA2-V-wild-type [WT] cells). AcLDL endocytosis was assessed by incubation with 125I-AcLDL or AcLDL conjugated with pHrodo. Actin polymerization was assessed by flow cytometry using Alexa Fluor 546-phalloidin. RESULTS In immunofluorescence microscopic studies, sPLA2-V was detected in the nucleus. ChIP-Seq and ChIP-qPCR analyses showed binding of sPLA2-V to the promoter region of the phosphoglycerate kinase 1 (Pgk1) gene. In the promoter assay, sPLA2-V-KD cells had lower promoter activity of the Pgk1 gene than sPLA2-V-WT cells, and this decrease could be reversed by transfection with a vector encoding sPLA2-V-H48Q that lacks enzymatic activity. Compared with sPLA2-V-WT cells, sPLA2-V-KD cells had decreased PGK1 protein expression, beclin 1 (Beclin1) phosphorylation at S30, and class III PI3-kinase activity that could also be restored by transfection with sPLA2-V-H48Q. sPLA2-V-KD cells had impaired actin polymerization and endocytosis, which was reversed by introduction of sPLA2-V-H48Q or PGK1 overexpression. In sPLA2-V-WT cells, siRNA-mediated depletion of PGK1 suppressed Beclin1 phosphorylation and impaired actin polymerization and intracellular trafficking of pHrodo-conjugated AcLDL. CONCLUSIONS Nuclear sPLA2-V binds to the Pgk1 gene promoter region and increases its transcriptional activity. sPLA2-V regulates AcLDL endocytosis through PGK1-Beclin1 in a manner that is independent of its enzymatic activity in RAW264.7 cells.
Collapse
Affiliation(s)
- Daisuke Fujioka
- Department of Internal Medicine II, University of Yamanashi, Faculty of Medicine
| | - Yosuke Watanabe
- Department of Internal Medicine II, University of Yamanashi, Faculty of Medicine
| | - Takamitsu Nakamura
- Department of Internal Medicine II, University of Yamanashi, Faculty of Medicine
| | - Takashi Yokoyama
- Department of Biochemistry, University of Yamanashi, Faculty of Medicine
| | - Keiji Miyazawa
- Department of Biochemistry, University of Yamanashi, Faculty of Medicine
| | - Makoto Murakami
- Laboratory of Microenvironmental and Metabolic Health Science, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, University of Tokyo.,AMED-CREST, Japan Agency for Medical Research and Development
| | - Kiyotaka Kugiyama
- Department of Internal Medicine II, University of Yamanashi, Faculty of Medicine.,AMED-CREST, Japan Agency for Medical Research and Development
| |
Collapse
|
109
|
Nuclear localization of non-structural protein 3 (NS3) during dengue virus infection. Arch Virol 2021; 166:1439-1446. [PMID: 33682072 DOI: 10.1007/s00705-021-05026-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 01/21/2021] [Indexed: 12/21/2022]
Abstract
Although dengue virus (DENV) replication occurs in the cytoplasm, the nucleus plays an essential role during infection. Both the capsid protein (C) and non-structural protein 5 (NS5) are translocated into the infected cell nucleus to favor viral replication. Previously, our group reported the nuclear localization of the NS3 protein during DENV infection of mosquito cells; however, the nuclear localization of the DENV NS3 protein in human host cells has not been described. Here, we demonstrated that NS3 is present in the nucleus of Huh7 cells at early infection times, and later, it is mainly located in the cytoplasm.
Collapse
|
110
|
Xie Q, Wang W, Li L, Kan Q, Fu H, Geng T, Li T, Wan Z, Gao W, Shao H, Qin A, Ye J. Domain in Fiber-2 interacted with KPNA3/4 significantly affects the replication and pathogenicity of the highly pathogenic FAdV-4. Virulence 2021; 12:754-765. [PMID: 33616472 PMCID: PMC7901544 DOI: 10.1080/21505594.2021.1888458] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The outbreaks of hepatitis-hydropericardium syndrome (HPS) caused by the highly pathogenic serotype 4 fowl adenovirus (FAdV-4) have caused a huge economic loss to the poultry industry globally since 2013. Although the Fiber-2 has been identified as a key virulent related factor for FAdV-4, little is known about its molecular basis. In this study, we identified the efficient interaction of the Fiber-2 with the karyopherin alpha 3/4 (KPNA3/4) protein via its N-terminus of 1–40aa. The analysis of the overexpression and knockout of KPNA3/4 showed that KPNA3/4 could efficiently assist the replication of FAdV-4. Moreover, a fiber-2-edited virus FAV-4_Del with a deletion of 7–40aa in Fiber-2 was rescued through the CRISPR-Cas9 technique. In comparison with the wild type FAdV-4, FAV-4_Del was highly attenuated in vitro and in vivo. Notably, the inoculation of FAV-4_Del in chickens could provide full protection against the lethal challenge with the wild type FAdV-4. All these findings not only give novel insights into the molecular basis for the pathogenesis of Fiber-2 but also provide efficient targets for developing antiviral strategies and live-attenuated vaccine candidates against the highly pathogenic FAdV-4.
Collapse
Affiliation(s)
- Quan Xie
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Weikang Wang
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Luyuan Li
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Qiuqi Kan
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Hui Fu
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Tuoyu Geng
- College of Animal Science and Technology, Yangzhou University , Yangzhou, China
| | - Tuofan Li
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Zhimin Wan
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Wei Gao
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Hongxia Shao
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Aijian Qin
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| | - Jianqiang Ye
- Key Laboratory of Jiangsu Preventive Veterinary Medicine, Key Laboratory for Avian Preventive Medicine, Ministry of Education, College of Veterinary Medicine, Yangzhou University , Yangzhou, China.,Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses , Yangzhou, China.,Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Yangzhou University , Yangzhou, China.,Institutes of Agricultural Science and Technology Development, Yangzhou University , Yangzhou, China
| |
Collapse
|
111
|
Mboukou A, Rajendra V, Kleinova R, Tisné C, Jantsch MF, Barraud P. Transportin-1: A Nuclear Import Receptor with Moonlighting Functions. Front Mol Biosci 2021; 8:638149. [PMID: 33681296 PMCID: PMC7930572 DOI: 10.3389/fmolb.2021.638149] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 01/13/2021] [Indexed: 12/11/2022] Open
Abstract
Transportin-1 (Trn1), also known as karyopherin-β2 (Kapβ2), is probably the best-characterized nuclear import receptor of the karyopherin-β family after Importin-β, but certain aspects of its functions in cells are still puzzling or are just recently emerging. Since the initial identification of Trn1 as the nuclear import receptor of hnRNP A1 ∼25 years ago, several molecular and structural studies have unveiled and refined our understanding of Trn1-mediated nuclear import. In particular, the understanding at a molecular level of the NLS recognition by Trn1 made a decisive step forward with the identification of a new class of NLSs called PY-NLSs, which constitute the best-characterized substrates of Trn1. Besides PY-NLSs, many Trn1 cargoes harbour NLSs that do not resemble the archetypical PY-NLS, which complicates the global understanding of cargo recognition by Trn1. Although PY-NLS recognition is well established and supported by several structures, the recognition of non-PY-NLSs by Trn1 is far less understood, but recent reports have started to shed light on the recognition of this type of NLSs. Aside from its principal and long-established activity as a nuclear import receptor, Trn1 was shown more recently to moonlight outside nuclear import. Trn1 has for instance been caught in participating in virus uncoating, ciliary transport and in modulating the phase separation properties of aggregation-prone proteins. Here, we focus on the structural and functional aspects of Trn1-mediated nuclear import, as well as on the moonlighting activities of Trn1.
Collapse
Affiliation(s)
- Allegra Mboukou
- Expression Génétique Microbienne, Institut de Biologie Physico-Chimique (IBPC), UMR 8261, CNRS, Université de Paris, Paris, France
| | - Vinod Rajendra
- Department of Cell and Developmental Biology, Center for Anatomy and Cell Biology, Medical University of Vienna, Vienna, Austria
| | - Renata Kleinova
- Department of Cell and Developmental Biology, Center for Anatomy and Cell Biology, Medical University of Vienna, Vienna, Austria
| | - Carine Tisné
- Expression Génétique Microbienne, Institut de Biologie Physico-Chimique (IBPC), UMR 8261, CNRS, Université de Paris, Paris, France
| | - Michael F. Jantsch
- Department of Cell and Developmental Biology, Center for Anatomy and Cell Biology, Medical University of Vienna, Vienna, Austria
| | - Pierre Barraud
- Expression Génétique Microbienne, Institut de Biologie Physico-Chimique (IBPC), UMR 8261, CNRS, Université de Paris, Paris, France
| |
Collapse
|
112
|
Sharma J, Antenos M, Madan P. A Comparative Analysis of Hippo Signaling Pathway Components during Murine and Bovine Early Mammalian Embryogenesis. Genes (Basel) 2021; 12:281. [PMID: 33669396 PMCID: PMC7920285 DOI: 10.3390/genes12020281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/08/2021] [Accepted: 02/12/2021] [Indexed: 12/20/2022] Open
Abstract
The time required for successful blastocyst formation varies among multiple species. The formation of a blastocyst is governed by numerous molecular cell signaling pathways, such as the Hippo signaling pathway. The Hippo signaling pathway is initiated by increased cell-cell contact and via apical polarity proteins (AMOT, PARD6, and NF2) during the period of preimplantation embryogenesis. Cell-cell contact and cell polarity activate (phosphorylates) the core cascade components of the pathway (mammalian sterile twenty like 1 and 2 (MST1/2) and large tumor suppressor 1 and 2 (LATS1/2)), which in turn phosphorylate the downstream effectors of the pathway (YAP1/TAZ). The Hippo pathway remains inactive with YAP1 (Yes Associated protein 1) present inside the nucleus in the trophectoderm (TE) cells (polar blastomeres) of the mouse blastocyst. In the inner cell mass (ICM) cells (apolar blastomeres), the pathway is activated with p-YAP1 present in the cytoplasm. On the contrary, during bovine embryogenesis, p-YAP1 is exclusively present in the nucleus in both TE and ICM cells. Contrary to mouse embryos, transcription co activator with PDZ-binding motif (TAZ) (also known as WWTR1) is also predominantly present in the cytoplasm in all the blastomeres during bovine embryogenesis. This review outlines the major differences in the localization and function of Hippo signaling pathway components of murine and bovine preimplantation embryos, suggesting significant differences in the regulation of this pathway in between the two species. The variance observed in the Hippo signaling pathway between murine and bovine embryos confirms that both of these early embryonic models are quite distinct. Moreover, based on the similarity of the Hippo signaling pathway between bovine and human early embryo development, bovine embryos could be an alternate model for understanding the regulation of the Hippo signaling pathway in human embryos.
Collapse
Affiliation(s)
| | | | - Pavneesh Madan
- Department of Biomedical Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada; (J.S.); (M.A.)
| |
Collapse
|
113
|
Xu M, Liang H, Li K, Zhu S, Yao Z, Xu R, Lin N. Value of KPNA4 as a diagnostic and prognostic biomarker for hepatocellular carcinoma. Aging (Albany NY) 2021; 13:5263-5283. [PMID: 33535183 PMCID: PMC7950262 DOI: 10.18632/aging.202447] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 11/25/2020] [Indexed: 05/11/2023]
Abstract
It is important to identify novel biomarkers to improve hepatocellular carcinoma (HCC) diagnosis and treatment. Herein, we reported the role of karyopherin α4 (KPNA4) in HCC patients through public data mining and examined the results using clinical samples in our center. Our results revealed that KPNA4 expression level was positively correlated with the infiltration of CD8+ T cells, B cells, dendritic cells, CD4+ T cells, neutrophils and macrophages. In addition, KPNA4 expression was significantly associated with T cell exhaustion. KPNA4 mRNA and protein expression levels were significantly higher in cancerous tissue than in normal tissue. Besides, the increased expression of KPNA4 indicated poor overall survival. Univariate and multivariate Cox regression analyses showed KPNA4 could be viewed as an independent risk factor for HCC patients. Moreover, our experimental results were consistent with those obtained from bioinformatic results. These findings revealed KPNA4 may serve as a novel prognostic biomarker and a potential therapeutic target for HCC.
Collapse
Affiliation(s)
- Mingxing Xu
- Department of Hepatobiliary Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| | - Hao Liang
- Department of General Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| | - Kun Li
- Department of Liver Transplantation, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| | - Shu Zhu
- Department of Infectious Diseases, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| | - Zhicheng Yao
- Department of General Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| | - Ruiyun Xu
- Department of Hepatobiliary Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| | - Nan Lin
- Department of Hepatobiliary Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, Guangdong, China
| |
Collapse
|
114
|
A Novel Multiprotein Bridging Factor 1-Like Protein Induces Cyst Wall Protein Gene Expression and Cyst Differentiation in Giardia lamblia. Int J Mol Sci 2021; 22:ijms22031370. [PMID: 33573049 PMCID: PMC7866390 DOI: 10.3390/ijms22031370] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/25/2021] [Accepted: 01/26/2021] [Indexed: 12/05/2022] Open
Abstract
The capacity to synthesize a protective cyst wall is critical for infectivity of Giardia lamblia. It is of interest to know the mechanism of coordinated synthesis of three cyst wall proteins (CWPs) during encystation, a differentiation process. Multiprotein bridging factor 1 (MBF1) gene family is a group of transcription coactivators that bridge various transcription factors. They are involved in cell growth and differentiation in yeast and animals, or in stress response in fungi and plants. We asked whether Giardia has MBF1-like genes and whether their products influence gene expression. BLAST searches of the Giardia genome database identified one gene encoding a putative MBF1 protein with a helix-turn-helix domain. We found that it can specifically bind to the AT-rich initiator promoters of the encystation-induced cwp1-3 and myb2 genes. MBF1 localized to cell nuclei and cytoplasm with higher expression during encystation. In addition, overexpression of MBF1 induced cwp1-3 and myb2 gene expression and cyst generation. Mutation of the helixes in the helix-turn-helix domain reduced cwp1-3 and myb2 gene expression and cyst generation. Chromatin immunoprecipitation assays confirmed the binding of MBF1 to the promoters with its binding sites in vivo. We also found that MBF1 can interact with E2F1, Pax2, WRKY, and Myb2 transcription factors that coordinately up-regulate the cwp genes during encystation. Using a CRISPR/Cas9 system for targeted disruption of mbf1 gene, we found a downregulation of cwp1-3 and myb2 genes and decrease of cyst generation. Our results suggest that MBF1 is functionally conserved and positively regulates Giardia cyst differentiation.
Collapse
|
115
|
Paci G, Caria J, Lemke EA. Cargo transport through the nuclear pore complex at a glance. J Cell Sci 2021; 134:237315. [PMID: 33495357 DOI: 10.1242/jcs.247874] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Bidirectional transport of macromolecules across the nuclear envelope is a hallmark of eukaryotic cells, in which the genetic material is compartmentalized inside the nucleus. The nuclear pore complex (NPC) is the major gateway to the nucleus and it regulates nucleocytoplasmic transport, which is key to processes including transcriptional regulation and cell cycle control. Accordingly, components of the nuclear transport machinery are often found to be dysregulated or hijacked in diseases. In this Cell Science at a Glance article and accompanying poster, we provide an overview of our current understanding of cargo transport through the NPC, from the basic transport signals and machinery to more emerging aspects, all from a 'cargo perspective'. Among these, we discuss the transport of large cargoes (>15 nm), as well as the roles of different cargo properties to nuclear transport, from size and number of bound nuclear transport receptors (NTRs), to surface and mechanical properties.
Collapse
Affiliation(s)
- Giulia Paci
- Biocentre, Johannes Gutenberg-University Mainz, Hans-Dieter-Hüsch-Weg 15, 555128 Mainz, Germany.,Institute of Molecular Biology, Ackermannweg 4, 55128 Mainz, Germany.,European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Joana Caria
- Biocentre, Johannes Gutenberg-University Mainz, Hans-Dieter-Hüsch-Weg 15, 555128 Mainz, Germany.,Institute of Molecular Biology, Ackermannweg 4, 55128 Mainz, Germany.,European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Edward A Lemke
- Biocentre, Johannes Gutenberg-University Mainz, Hans-Dieter-Hüsch-Weg 15, 555128 Mainz, Germany .,Institute of Molecular Biology, Ackermannweg 4, 55128 Mainz, Germany.,European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| |
Collapse
|
116
|
Nuclear Import of Adeno-Associated Viruses Imaged by High-Speed Single-Molecule Microscopy. Viruses 2021; 13:v13020167. [PMID: 33499411 PMCID: PMC7911914 DOI: 10.3390/v13020167] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/21/2021] [Accepted: 01/21/2021] [Indexed: 12/15/2022] Open
Abstract
Understanding the detailed nuclear import kinetics of adeno-associated virus (AAV) through the nuclear pore complex (NPC) is essential for the application of AAV capsids as a nuclear delivery instrument as well as a target for drug development. However, a comprehensive understanding of AAV transport through the sub-micrometer NPCs in live cells calls for new techniques that can conquer the limitations of conventional fluorescence microscopy and electron microscopy. With recent technical advances in single-molecule fluorescence microscopy, we are now able to image the entire nuclear import process of AAV particles and also quantify the transport dynamics of viral particles through the NPCs in live human cells. In this review, we initially evaluate the necessity of single-molecule live-cell microscopy in the study of nuclear import for AAV particles. Then, we detail the application of high-speed single-point edge-excitation sub-diffraction (SPEED) microscopy in tracking the entire process of nuclear import for AAV particles. Finally, we summarize the major findings for AAV nuclear import by using SPEED microscopy.
Collapse
|
117
|
Mechanisms of meiotic drive in symmetric and asymmetric meiosis. Cell Mol Life Sci 2021; 78:3205-3218. [PMID: 33449147 DOI: 10.1007/s00018-020-03735-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 11/13/2020] [Accepted: 12/08/2020] [Indexed: 12/22/2022]
Abstract
Meiotic drive, the non-Mendelian transmission of chromosomes to the next generation, functions in asymmetric or symmetric meiosis across unicellular and multicellular organisms. In asymmetric meiosis, meiotic drivers act to alter a chromosome's spatial position in a single egg. In symmetric meiosis, meiotic drivers cause phenotypic differences between gametes with and without the driver. Here we discuss existing models of meiotic drive, highlighting the underlying mechanisms and regulation governing systems for which the most is known. We focus on outstanding questions surrounding these examples and speculate on how new meiotic drive systems evolve and how to detect them.
Collapse
|
118
|
Huang S, Dougherty LL, Avasthi P. Separable roles for RanGTP in nuclear and ciliary trafficking of a kinesin-2 subunit. J Biol Chem 2021; 296:100117. [PMID: 33234597 PMCID: PMC7948393 DOI: 10.1074/jbc.ra119.010936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 11/16/2020] [Accepted: 11/24/2020] [Indexed: 01/05/2023] Open
Abstract
Kinesin is part of the microtubule-binding motor protein superfamily, which serves important roles in cell division and intraorganellar transport. The heterotrimeric kinesin-2, consisting of the heterodimeric motor subunits, kinesin family member 3A/3B (KIF3A/3B), and kinesin-associated protein 3 (KAP3), is highly conserved across species from the unicellular eukaryote Chlamydomonas to humans. It plays diverse roles in cargo transport including anterograde (base to tip) trafficking in cilia. However, the molecular determinants mediating trafficking of heterotrimeric kinesin-2 itself are poorly understood. It has been previously suggested that ciliary transport is analogous to nuclear transport mechanisms. Using Chlamydomonas and human telomerase reverse transcriptase-retinal pigment epithelial cell line, we show that RanGTP, a small GTPase that dictates nuclear transport, regulates ciliary trafficking of KAP3, a key component for functional kinesin-2. We found that the armadillo-repeat region 6 to 9 (ARM6-9) of KAP3, required for its nuclear translocation, is also necessary and sufficient for its targeting to the ciliary base. Given that KAP3 is essential for cilium formation and there are the emerging roles for RanGTP/importin β in ciliary protein targeting, we further investigated the effect of RanGTP in cilium formation and maintenance. We found that precise control of RanGTP levels, revealed by different Ran mutants, is crucial for cilium formation and maintenance. Most importantly, we were able to provide orthogonal support in an algal model system that segregates RanGTP regulation of ciliary protein trafficking from its nuclear roles. Our work provides important support for the model that nuclear import mechanisms have been co-opted for independent roles in ciliary import.
Collapse
Affiliation(s)
- Shengping Huang
- Department of Ophthalmology, University of Kansas Medical Center, Kansas City, Kansas, USA.
| | - Larissa L Dougherty
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, Kansas, USA; Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth College, Hanover, New Hampshire, USA
| | - Prachee Avasthi
- Department of Ophthalmology, University of Kansas Medical Center, Kansas City, Kansas, USA; Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, Kansas, USA; Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth College, Hanover, New Hampshire, USA.
| |
Collapse
|
119
|
Xu GX, Mak ECL, Lo KKW. Photofunctional transition metal complexes as cellular probes, bioimaging reagents and phototherapeutics. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00931a] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This critical review summarises the recent biological applications of transition metal complexes as cellular probes, bioimaging reagents and phototherapeutics.
Collapse
Affiliation(s)
- Guang-Xi Xu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong, P. R. China
| | - Eunice Chiu-Lam Mak
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong, P. R. China
| | - Kenneth Kam-Wing Lo
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Hong Kong, P. R. China
- State Key Laboratory of Terahertz and Millimetre Waves, City University of Hong Kong, Tat Chee Avenue, Hong Kong, P. R. China
- Centre of Functional Photonics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, P. R. China
| |
Collapse
|
120
|
Oany AR, Pervin T, Moni MA. Pharmacoinformatics based elucidation and designing of potential inhibitors against Plasmodium falciparum to target importin α/β mediated nuclear importation. INFECTION GENETICS AND EVOLUTION 2020; 88:104699. [PMID: 33385575 DOI: 10.1016/j.meegid.2020.104699] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 12/23/2020] [Accepted: 12/24/2020] [Indexed: 12/12/2022]
Abstract
Plasmodium falciparum, the prime causative agent of malaria, is responsible for 4, 05,000 deaths per year and fatality rates are higher among the children aged below 5 years. The emerging distribution of the multi-drug resistant P. falciparum becomes a worldwide concern, so the identification of unique targets and novel inhibitors is a prime need now. In the present study, we have employed pharmacoinformatics approaches to analyze 265 lead-like compounds from PubChem databases for virtual screening. Thereafter, 15 lead-like compounds were docked within the active side pocket of importin alpha. Comparative ligand properties and absorption, distribution, metabolism, excretion, and toxicity (ADMET) profile were also assessed. Finally, a novel inhibitor was designed and assessed computationally for its efficacy. From the comparative analysis we have found that our screened compounds possess better results than the existing lead ivermectin; having the highest binding energy of -15.6 kcal/mol, whereas ivermectin has -12.4 kcal/mol. The novel lead compound possessed more fascinating output without deviating any of the rules of Lipinski. It also possessed higher bioavailability and the drug-likeness score of 0.55 and 0.71, respectively compared to ivermectin. Furthermore, the binding study was confirmed by molecular dynamics simulation over 25 ns by evaluating the stability of the complex. Finally, all the screened compounds and the novel compound showed promising ADMET properties likewise. To end, we hope that our proposed screened compounds, as well as the novel compound, might give some advances to treat malaria efficiently in vitro and in vivo.
Collapse
Affiliation(s)
- Arafat Rahman Oany
- Department of Biotechnology and Genetic Engineering, Faculty of Life Science, Mawlana Bhashani Science and Technology University, Tangail, Bangladesh; Aristopharma Limited, Bangladesh.
| | - Tahmina Pervin
- Biotechnology and Genetic Engineering Discipline, Life Science School, Khulna University, Khulna, Bangladesh
| | - Mohammad Ali Moni
- Department of Computer Science & Engineering, Green University, Bangladesh; Department of Computer Science & Engineering, Pabna University of Science & Technology, Bangladesh; WHO Collaborating Centre on eHealth, UNSW Digital Health, School of Public Health and Community Medicine, Faculty of Medicine, UNSW, Sydney, Australia.
| |
Collapse
|
121
|
Lacasse V, Beaudoin S, Jean S, Leyton JV. A Novel Proteomic Method Reveals NLS Tagging of T-DM1 Contravenes Classical Nuclear Transport in a Model of HER2-Positive Breast Cancer. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2020; 19:99-119. [PMID: 33024794 PMCID: PMC7522293 DOI: 10.1016/j.omtm.2020.08.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 08/27/2020] [Indexed: 11/01/2022]
Abstract
The next breakthrough for protein therapeutics is effective intracellular delivery and accumulation within target cells. Nuclear localization signal (NLS)-tagged therapeutics have been hindered by the lack of efficient nuclear localization due to endosome entrapment. Although development of strategies for tagging therapeutics with technologies capable of increased membrane penetration has resulted in proportional increased potency, nonspecific membrane penetration limits target specificity and, hence, widespread clinical success. There is a long-standing idea that nuclear localization of NLS-tagged agents occurs exclusively via classical nuclear transport. In the present study, we modified the antibody-drug conjugate trastuzumab-emtansine (T-DM1) with a classical NLS linked to cholic acid (cell accumulator [Accum]) that enables modified antibodies to escape endosome entrapment and increase nuclear localization efficiency without abrogating receptor targeting. In parallel, we developed a proteomics-based method to evaluate nuclear transport. Accum-modified T-DM1 significantly enhanced cytotoxic efficacy in the human epidermal growth factor receptor 2 (HER2)-positive SKBR3 breast cancer system. We discovered that efficacy was dependent on the nonclassical importin-7. Our evaluation reveals that when multiple classical NLS tagging occurs, cationic charge build-up as opposed to sequence dominates and becomes a substrate for importin-7. This study results in an effective target cell-specific NLS therapeutic and a general approach to guide future NLS-based development initiatives.
Collapse
Affiliation(s)
- Vincent Lacasse
- Department of Nuclear Medicine and Radiobiology, Faculty of Medicine and Health Sciences, Centre Hospitalier Universitaire de Sherbrooke (CHUS), Université de Sherbrooke (UdeS), Sherbrooke, QC J1H 5N4, Canada
| | - Simon Beaudoin
- Department of Nuclear Medicine and Radiobiology, Faculty of Medicine and Health Sciences, Centre Hospitalier Universitaire de Sherbrooke (CHUS), Université de Sherbrooke (UdeS), Sherbrooke, QC J1H 5N4, Canada
| | - Steve Jean
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, CHUS, UdeS, Sherbrooke, QC J1H 5N4, Canada
| | - Jeffrey V Leyton
- Department of Nuclear Medicine and Radiobiology, Faculty of Medicine and Health Sciences, Centre Hospitalier Universitaire de Sherbrooke (CHUS), Université de Sherbrooke (UdeS), Sherbrooke, QC J1H 5N4, Canada.,Sherbrooke Molecular Imaging Centre (CIMS), Centre de Recherche du CHUS, UdeS, Sherbrooke, QC J1H 5N4, Canada
| |
Collapse
|
122
|
Cruz VE, Esra Demircioglu F, Schwartz TU. Structural Analysis of Different LINC Complexes Reveals Distinct Binding Modes. J Mol Biol 2020; 432:6028-6041. [DOI: 10.1016/j.jmb.2020.09.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 09/22/2020] [Accepted: 09/23/2020] [Indexed: 01/17/2023]
|
123
|
The synergistic effect of biomimetic electrical stimulation and extracellular-matrix-mimetic nanopattern for upregulating cell activities. Biosens Bioelectron 2020; 167:112470. [DOI: 10.1016/j.bios.2020.112470] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 07/19/2020] [Accepted: 07/21/2020] [Indexed: 02/07/2023]
|
124
|
Martin APJ, Camonis JH. The hippo kinase STK38 ensures functionality of XPO1. Cell Cycle 2020; 19:2982-2995. [PMID: 33017560 PMCID: PMC7714482 DOI: 10.1080/15384101.2020.1826619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 08/06/2020] [Accepted: 08/08/2020] [Indexed: 10/23/2022] Open
Abstract
The proper segregation of basic elements such as the compartmentalization of the genome and the shuttling of macromolecules between the nucleus and the cytoplasm is a crucial mechanism for homeostasis maintenance in eukaryotic cells. XPO1 (Exportin 1) is the major nuclear export receptor and is required for the export of proteins and RNAs out of the nucleus. STK38 (also known as NDR1) is a Hippo pathway serine/threonine kinase with multifarious functions in normal and cancer cells. In this review, we summarize the history of the discovery of the nucleo/cytoplasmic shuttling of proteins and focus on the major actor of nuclear export: XPO1. After describing the molecular events required for XPO1-mediated nuclear export of proteins, we introduce the Hippo pathway STK38 kinase, synthetize its regulation mechanisms as well as its biological functions in both normal and cancer cells, and finally its intersection with XPO1 biology. We discuss the recently identified mechanism of XPO1 activation by phosphorylation of XPO1_S1055 by STK38 and contextualize this finding according to the biological functions previously reported for both XPO1 and STK38, including the second identity of STK38 as an autophagy regulator. Finally, we phrase this newly identified activation mechanism into the general nuclear export machinery and examine the possible outcomes of nuclear export inhibition in cancer treatment.
Collapse
Affiliation(s)
- Alexandre PJ Martin
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, USA
| | - Jacques H Camonis
- Inserm U830, Institut Curie, Centre de Recherche, Paris Sciences et Lettres Research University, Paris, France
| |
Collapse
|
125
|
Lopez-Salas FE, Nadella R, Maldonado-Berny M, Escobedo-Sanchez ML, Fiorentino-Pérez R, Gatica-García B, Fernandez-Parrilla MA, Mario Gil M, Reyes-Corona D, García U, Orozco-Barrios CE, Gutierrez-Castillo ME, Martinez-Fong D. Synthetic Monopartite Peptide That Enables the Nuclear Import of Genes Delivered by the Neurotensin-Polyplex Vector. Mol Pharm 2020; 17:4572-4588. [PMID: 33125243 DOI: 10.1021/acs.molpharmaceut.0c00755] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Neurotensin (NTS)-polyplex is a multicomponent nonviral vector that enables gene delivery via internalization of the neurotensin type 1 receptor (NTSR1) to dopaminergic neurons and cancer cells. An approach to improving its therapeutic safety is replacing the viral karyophilic component (peptide KPSV40; MAPTKRKGSCPGAAPNKPK), which performs the nuclear import activity, by a shorter synthetic peptide (KPRa; KMAPKKRK). We explored this issue and the mechanism of plasmid DNA translocation through the expression of the green fluorescent protein or red fluorescent protein fused with KPRa and internalization assays and whole-cell patch-clamp configuration experiments in a single cell together with importin α/β pathway blockers. We showed that KPRa electrostatically bound to plasmid DNA increased the transgene expression compared with KPSV40 and enabled nuclear translocation of KPRa-fused red fluorescent proteins and plasmid DNA. Such translocation was blocked with ivermectin or mifepristone, suggesting importin α/β pathway mediation. KPRa also enabled NTS-polyplex-mediated expression of reporter or physiological genes such as human mesencephalic-derived neurotrophic factor (hMANF) in dopaminergic neurons in vivo. KPRa is a synthetic monopartite peptide that showed nuclear import activity in NTS-polyplex vector-mediated gene delivery. KPRa could also improve the transfection of other nonviral vectors used in gene therapy.
Collapse
Affiliation(s)
- Francisco E Lopez-Salas
- Programa de Doctorado en Nanociencias y Nanotecnología, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Rasajna Nadella
- Biosciences, IIIT Srikakulam-RGUKT, Etcherla 532402, Srikakulam District, Andhra Pradesh, India
| | - Minerva Maldonado-Berny
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Maria L Escobedo-Sanchez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Rosana Fiorentino-Pérez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Bismark Gatica-García
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Manuel A Fernandez-Parrilla
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Moreno Mario Gil
- Departamento de Farmacología, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - David Reyes-Corona
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Ubaldo García
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| | - Carlos E Orozco-Barrios
- Hospital de Especialidades Dr. Bernardo Sepúlveda, Centro Médico Nacional Siglo XXI, Unidad de Investigaciones Médicas en Enfermedades Neurológicas, CONACyT, Av. Cuauhtémoc 330, Doctores, 06720 Ciudad de México, Mexico
| | - Maria E Gutierrez-Castillo
- Departamento de Biociencias e Ingeniería, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Instituto Politécnico Nacional, 30 de junio de 1520 s/n, La Laguna Ticoman, 07340 Ciudad de Mexico, Mexico
| | - Daniel Martinez-Fong
- Programa de Doctorado en Nanociencias y Nanotecnología, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico.,Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados, Av. Instituto Politécnico Nacional, No. 2508, San Pedro Zacatenco, 07360 Ciudad de México, Mexico
| |
Collapse
|
126
|
Yoshizawa T, Matsumura H. Effect of nuclear import receptors on liquid-liquid phase separation. Biophys Physicobiol 2020; 17:25-29. [PMID: 33110735 PMCID: PMC7550251 DOI: 10.2142/biophysico.bsj-2019052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 02/07/2020] [Indexed: 02/01/2023] Open
Abstract
Low-complexity (LC) sequences, regions that are predominantly made up of limited amino acids, are often observed in eukaryotic nuclear proteins. The role of these LC sequences has remained unclear for decades. Recent studies have shown that LC sequences are important in the formation of membrane-less organelles via liquid–liquid phase separation (LLPS). The RNA binding protein, fused in sarcoma (FUS), is the most widely studied of the proteins that undergo LLPS. It forms droplets, fibers, or hydrogels using its LC sequences. The N-terminal LC sequence of FUS is made up of Ser, Tyr, Gly, and Gln, which form a labile cross-β polymer core while the C-terminal Arg-Gly-Gly repeats accelerate LLPS. Normally, FUS localizes to the nucleus via the nuclear import receptor karyopherin β2 (Kapβ2) with the help of its C-terminal proline-tyrosine nuclear localization signal (PY-NLS). Recent findings revealed that Kapβ2 blocks FUS mediated LLPS, suggesting that Kapβ2 is not only a transport protein but also a chaperone which regulates LLPS during the formation of membrane-less organelles. In this review, we discuss the effects of the nuclear import receptors on LLPS.
Collapse
Affiliation(s)
- Takuya Yoshizawa
- College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Hiroyoshi Matsumura
- College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| |
Collapse
|
127
|
Zhang X, Lin X, Qin C, Huang K, Sun X, Zhao L, Jin M. Avian Chaperonin Containing TCP1 Subunit 5 Supports Influenza A Virus Replication by Interacting With Viral Nucleoprotein, PB1, and PB2 Proteins. Front Microbiol 2020; 11:538355. [PMID: 33178142 PMCID: PMC7593399 DOI: 10.3389/fmicb.2020.538355] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 08/26/2020] [Indexed: 11/30/2022] Open
Abstract
Humans and avian species are prone to influenza viral infection, which may cause serious clinical consequences. Many studies have documented the critical role of host factors in the influenza virus life cycle based on human models, but knowledge about their roles in birds is very limited. In this study, using immunoprecipitation coupled with mass spectrometry, a total of 72 potential interacting proteins of influenza nucleoprotein (NP) were identified in DF-1 cells. Among these proteins, avian chaperonin containing TCP1 subunit 5 (CCT5) was demonstrated to interact with influenza A virus (IAV) NP directly, as well as polymerase basic protein 1 (PB1) and polymerase basic protein 2 (PB2) but not with polymerase acidic protein (PA). Further investigation showed that viral infection profoundly elevated the expression level of cellular CCT5, whose expression, in turn, promoted the nuclear export of NP, as well as viral polymerase activity, thereby facilitating the replication of IAV. The obtained results suggested an important role of avian CCT5 in supporting influenza virus replication, which may serve as an anti-influenza target.
Collapse
Affiliation(s)
- Xiaohan Zhang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Xian Lin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Chenghuang Qin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Kun Huang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Xiaomei Sun
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture of the People's Republic of China, Wuhan, China
| | - Lianzhong Zhao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Meilin Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture of the People's Republic of China, Wuhan, China
| |
Collapse
|
128
|
Shen C, Yuan J. Genome-wide characterization and expression analysis of the heat shock transcription factor family in pumpkin (Cucurbita moschata). BMC PLANT BIOLOGY 2020; 20:471. [PMID: 33054710 PMCID: PMC7557022 DOI: 10.1186/s12870-020-02683-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 10/01/2020] [Indexed: 05/02/2023]
Abstract
BACKGROUND Crop quality and yield are affected by abiotic and biotic stresses, and heat shock transcription factors (Hsfs) are considered to play important roles in regulating plant tolerance under various stresses. To investigate the response of Cucurbita moschata to abiotic stress, we analyzed the genome of C. moschata. RESULTS In this research, a total of 36 C. moschata Hsf (CmHsf) members were identified and classified into three subfamilies (I, II, and III) according to their amino acid sequence identity. The Hsfs of the same subfamily usually exhibit a similar gene structure (intron-exon distribution) and conserved domains (DNA-binding and other functional domains). Chromosome localization analysis showed that the 36 CmHsfs were unevenly distributed on 18 of the 21 chromosomes (except for Cm_Chr00, Cm_Chr08 and Cm_Chr20), among which 18 genes formed 9 duplicated gene pairs that have undergone segmental duplication events. The Ka/Ks ratio showed that the duplicated CmHsfs have mainly experienced strong purifying selection. High-level synteny was observed between C. moschata and other Cucurbitaceae species. CONCLUSIONS The expression profile of CmHsfs in the roots, stems, cotyledons and true leaves revealed that the CmHsfs exhibit tissue specificity. The analysis of cis-acting elements and quantitative real-time polymerase chain reaction (qRT-PCR) revealed that some key CmHsfs were activated by cold stress, heat stress, hormones and salicylic acid. This study lays the foundation for revealing the role of CmHsfs in resistance to various stresses, which is of great significance for the selection of stress-tolerant C. moschata.
Collapse
Affiliation(s)
- Changwei Shen
- School of Resources and Environmental Sciences, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Jingping Yuan
- School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology, Xinxiang, 453003, Henan, China.
- Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang, 453003, China.
| |
Collapse
|
129
|
Kashif M, Bharati AP, Chaturvedi SK, Khan RH, Ahmad A, Kumar B, Zamzami MA, Ahmad V, Kumari S. pH and alcohol induced structural transition in Ntf2 a nuclear transport factor of Saccharomyces cerevisiae. Int J Biol Macromol 2020; 159:79-86. [PMID: 32407943 DOI: 10.1016/j.ijbiomac.2020.05.056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 10/24/2022]
Abstract
Ntf2 is a nuclear envelope protein, which play a pivotal role in nucleocytoplasmic transport and mediates the nuclear import of RanGDP. It interacts with various nucleoporins along with Ran-GDP and part of a multicomponent system that assembles at the nuclear pore complex (NCP) during nuclear import. Here, we have described the biophysical characterization of Ntf2 from Saccharomyces cerevisiae. Recombinant Ntf2 showed increment in the β-sheet content as well as decrement in the α-helix content from pH-7.0 to pH-4.0. A subsequent decrease in the pH led to increment in the α-helical content along with decrement in β-sheet content. Intrinsic fluorescence studies demonstrated the unfolding of the protein below physiological pH. Ntf2 showed stabilization as well as phenomenal phase transition (β sheet to α helix) by increase in alcohol concentration from 10% to 70%. Further increase in alcohol concentration (90%) resulted in residual secondary structure in Ntf2 protein. Presence of ammonium sulfate also stabilizes the secondary structure of Ntf2 protein. The structural characterization reveals the flexibility and the stability of Ntf2 at various conditions. These structural alterations in Ntf2 protein probably occurs in the course of nucleocytoplasmic transport when it interacts with other proteins moving towards its final destination.
Collapse
Affiliation(s)
- Mohd Kashif
- Center for Plant Molecular Biology Division, CSIR-NBRI, Lucknow, India.
| | | | | | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Abrar Ahmad
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
| | - Bhupendra Kumar
- Center for Plant Molecular Biology Division, CSIR-NBRI, Lucknow, India
| | - Mazin A Zamzami
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Varish Ahmad
- Department of Health and Information Technology, Faculty of Applied Studies, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Sunita Kumari
- ICAR-Indian Institute of Seed Science, Mau, Uttar Pradesh 275103, India
| |
Collapse
|
130
|
Chromosome clustering by Ki-67 excludes cytoplasm during nuclear assembly. Nature 2020; 587:285-290. [PMID: 32879492 PMCID: PMC7666080 DOI: 10.1038/s41586-020-2672-3] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 06/08/2020] [Indexed: 12/31/2022]
Abstract
Gene expression in eukaryotes requires the effective separation of nuclear transcription and RNA processing from cytosolic translation1. This separation is achieved by the nuclear envelope, which controls the exchange of macromolecules through nuclear pores2. During mitosis, however, the nuclear envelope in animal and plant cells disassembles, allowing cytoplasmic and nuclear components to intermix3. When the nuclear envelope is reformed, cytoplasmic components are removed from the nucleus by receptor-mediated transport through nuclear pores2. These pores have a size limit of 39 nanometres4-7, which raises the question of how larger cytoplasmic molecules are cleared from the nucleus. Here we show in HeLa cells that large cytoplasmic components are displaced before nuclear envelope assembly by the movement of chromosomes to a dense cluster. This clustering occurs when chromosomes approach the poles of anaphase spindles, and is mediated by a microtubule-independent mechanism that involves the surfactant-like protein Ki-67. Ki-67 forms repulsive molecular brushes during the early stages of mitosis8, but during mitotic exit the brushes collapse and Ki-67 promotes chromosome clustering. We show that the exclusion of mature ribosomes from the nucleus after mitosis depends on Ki-67-regulated chromosome clustering. Thus, our study reveals that chromosome mechanics help to re-establish the compartmentalization of eukaryotic cells after open mitosis.
Collapse
|
131
|
Modeling the nucleoporins that form the hairy pores. Biochem Soc Trans 2020; 48:1447-1461. [DOI: 10.1042/bst20190941] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 07/03/2020] [Accepted: 07/16/2020] [Indexed: 11/17/2022]
Abstract
Sitting on the nuclear envelope, nuclear pore complexes (NPCs) control the molecular transport between the nucleus and the cytoplasm. Without definite open or close states, the NPC uses a family of intrinsically disordered nucleoporins called FG-Nups to construct a selective permeability barrier whose functional structure is unclear. Experimental advances have offered high-resolution molecular knowledge of the NPC scaffold and docking of the unfolded FG-Nups, however, the ‘hairy’ barrier structure still appears as blurred lobes even under the state-of-the-art microscopy. Without accurate experimental visualization, the molecular mechanism for the NPC-mediated transport remains a matter of debate. Modeling provides an alternative way to resolve this long-standing mystery. Here, we briefly review different methods employed in modeling the FG-Nups, arranging from all-atom molecular dynamics to mean-field theories. We discuss the advantage and limit of each modeling technique, and summarize the theoretical insights that, despite certain controversy, deepened our understanding of the hairy pore.
Collapse
|
132
|
Baumhardt JM, Walker JS, Lee Y, Shakya B, Brautigam CA, Lapalombella R, Grishin N, Chook YM. Recognition of nuclear export signals by CRM1 carrying the oncogenic E571K mutation. Mol Biol Cell 2020; 31:1879-1891. [PMID: 32520643 PMCID: PMC7525811 DOI: 10.1091/mbc.e20-04-0233] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/26/2020] [Accepted: 06/04/2020] [Indexed: 12/28/2022] Open
Abstract
The E571K mutation of CRM1 is highly prevalent in some cancers, but its mechanism of tumorigenesis is unclear. Glu571 of CRM1 is located in its nuclear export signal (NES)-binding groove, suggesting that binding of select NESs may be altered. We generated HEK 293 cells with either monoallelic CRM1WT/E571K or biallelic CRM1E571K/E571K using CRISPR/Cas9. We also combined analysis of binding affinities and structures of 27 diverse NESs for wild-type and E571K CRM1 with structure-based bioinformatics. While most NESs bind the two CRM1 similarly, NESs from Mek1, eIF4E-transporter, and RPS2 showed >10-fold affinity differences. These NESs have multiple charged side chains binding close to CRM1 position 571, but this feature alone was not sufficient to predict different binding to CRM1(E571K). Consistent with eIF4E-transporter NES binding weaker to CRM1(E571K), eIF4E-transporter was mislocalized in tumor cells carrying CRM1(E571K). This serves as proof of concept that understanding how CRM1(E571K) affects NES binding provides a platform for identifying cargoes that are mislocalized in cancer upon CRM1 mutation. Finally, we showed that large affinity changes seen with some NES peptides (of Mek1 and RPS2) do not always translate to the full-length cargoes, suggesting limitations with current NES prediction methods. Therefore, comprehensive studies like ours are imperative to identify CRM1 cargoes with real pathogenic potential.
Collapse
Affiliation(s)
- Jordan M. Baumhardt
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Janek S. Walker
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH 43210
| | - Yoonji Lee
- Departments of Biophysics and Microbiology and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Binita Shakya
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Chad A. Brautigam
- Departments of Biophysics and Microbiology and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Rosa Lapalombella
- Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH 43210
| | - Nick Grishin
- Departments of Biophysics and Microbiology and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Yuh Min Chook
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390
| |
Collapse
|
133
|
Zhou W, Liu Y, Gao Y, Cheng Y, Chang R, Li X, Zhou Y, Wang S, Liang L, Duan C, Zhang C. MICAL2 is a novel nucleocytoplasmic shuttling protein promoting cancer invasion and growth of lung adenocarcinoma. Cancer Lett 2020; 483:75-86. [PMID: 32360180 DOI: 10.1016/j.canlet.2020.04.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 04/02/2020] [Accepted: 04/22/2020] [Indexed: 12/16/2022]
Abstract
MICAL2 is a tumor-promoting factor involved in cell migration, invasion, deformation, and proliferation not yet fully explored in lung adenocarcinoma (LUAD). This study demonstrated that MICAL2 was overexpressed and cytoplasm-enriched in LUAD tissues. Moreover, high cytoplasmic MICAL2 and/or total MICAL2 expression levels were positively correlated with lymphatic metastasis and shorter overall survival in LUAD patients. MICAL2 promoted LUAD cell proliferation, migration, invasion, and epithelial to mesenchymal transition-all of which involved the AKT and myosin-9 pathways. Furthermore, MICAL2 was identified as a nucleoplasm shuttling protein dependent on myosin-9 and its C-terminal fragment. MICAL2-ΔC-enriched in the nucleus-had less impact on tumor malignancy in LUAD cells in vitro and in vivo. Tumor promotion by MICAL2 was reduced by nuclear-export inhibitor, myosin-9 inhibitor, or si-myosin-9-all of which effectively inhibited MICAL2's nuclear export. Finally, the expression and subcellular location as well as clinical significance of MICAL2 and myosin-9 were analyzed across TCGA data and LUAD tissue arrays. Our data revealed that MICAL2 overexpression and nuclear export were associated with cancer progression; inhibiting its expression and/or nuclear export may provide a new target for LUAD therapy.
Collapse
Affiliation(s)
- Wolong Zhou
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Yuanqi Liu
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Yang Gao
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Yuanda Cheng
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Ruimin Chang
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Xizhe Li
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Yanwu Zhou
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China
| | - Shaoqiang Wang
- Department of Thoracic Surgery, Affiliated Hospital of Jining Medical College, Jining Medical College, Jining, 272000, PR China
| | - Lubiao Liang
- Department of Thoracic Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi Medical University, Zunyi, 563000, PR China
| | - Chaojun Duan
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, PR China.
| | - Chunfang Zhang
- Department of Thoracic Surgery, Xiangya Hospital, Central South University, Changsha, 410008, PR China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008, PR China; Hunan Engineering Research Center for Pulmonary Nodules Precise Diagnosis and Treatment, Xiangya Hospital, Central South University, Changsha, 410008, PR China.
| |
Collapse
|
134
|
Characterization of the Importin-β binding domain in nuclear import receptor KPNA7. Biochem J 2020; 476:3413-3434. [PMID: 31642884 DOI: 10.1042/bcj20190717] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 12/19/2022]
Abstract
The KPNA family of mammalian nuclear import receptors are encoded by seven genes that generate isoforms with 42-86% identity. KPNA isoforms have the same protein architecture and share the functional property of nuclear localization signal (NLS) recognition, however, the tissue and developmental expression patterns of these receptors raise the question of whether subtle differences in KPNA isoforms might be important in specific biological contexts. Here, we show that KPNA7, an isoform with expression mostly limited to early development, can bind Importin-β (Imp-β) in the absence of NLS cargo. This result contrasts with Imp-β interactions with other KPNA family members, where affinity is regulated by NLS cargo as part of a cooperative binding mechanism. The Imp-β binding (IBB) domain, which is highly conserved in all KPNA family members, generally serves to occlude the NLS binding groove and maintain the receptor in an auto-inhibited 'closed' state prior to NLS contact. Cooperative binding of NLS cargo and Imp-β to KPNA results in an 'open'state. Characterization of KPNA2-KPNA7 chimeric proteins suggests that features of both the IBB domain and the core structure of the receptor contribute to the extent of IBB domain accessibility for Imp-β binding, which likely reflects an 'open' state. We also provide evidence that KPNA7 maintains an open-state in the nucleus. We speculate that KPNA7 could function within the nucleus by interacting with NLS-containing proteins.
Collapse
|
135
|
Francia ME, Bhavsar S, Ting LM, Croken MM, Kim K, Dubremetz JF, Striepen B. A Homolog of Structural Maintenance of Chromosome 1 Is a Persistent Centromeric Protein Which Associates With Nuclear Pore Components in Toxoplasma gondii. Front Cell Infect Microbiol 2020; 10:295. [PMID: 32714878 PMCID: PMC7343853 DOI: 10.3389/fcimb.2020.00295] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 05/19/2020] [Indexed: 01/02/2023] Open
Abstract
Apicomplexa are obligate intracellular parasites which cause various animal and human diseases including malaria, toxoplasmosis, and cryptosporidiosis. They proliferate by a unique mechanism that combines physically separated semi-closed mitosis of the nucleus and assembly of daughter cells by internal budding. Mitosis occurs in the presence of a nuclear envelope and with little appreciable chromatin condensation. A long standing question in the field has been how parasites keep track of their uncondensed chromatin chromosomes throughout their development, and hence secure proper chromosome segregation during division. Past work demonstrated that the centromeres, the region of kinetochore assembly at chromosomes, of Toxoplasma gondii remain clustered at a defined region of the nuclear periphery proximal to the main microtubule organizing center of the cell, the centrosome. We have proposed that this mechanism is likely involved in the process. Here we set out to identify underlying molecular players involved in centromere clustering. Through pharmacological treatment and structural analysis we show that centromere clustering is not mediated by persistent microtubules of the mitotic spindle. We identify the chromatin binding factor a homolog of structural maintenance of chromosomes 1 (SMC1). Additionally, we show that both TgSMC1, and a centromeric histone, interact with TgExportin1, a predicted soluble component of the nuclear pore complex. Our results suggest that the nuclear envelope, and in particular the nuclear pore complex may play a role in positioning centromeres in T. gondii.
Collapse
Affiliation(s)
- Maria E Francia
- Department of Cellular Biology, University of Georgia, Athens, GA, United States
| | - Sheila Bhavsar
- Department of Cellular Biology, University of Georgia, Athens, GA, United States
| | - Li-Min Ting
- Morsani College of Medicine, University of South Florida Health, Tampa, FL, United States
| | - Matthew M Croken
- Pathology, Molecular and Cell Based Medicine, Mount Sinai Medical Center, New York, NY, United States
| | - Kami Kim
- Morsani College of Medicine, University of South Florida Health, Tampa, FL, United States
| | | | - Boris Striepen
- Department of Cellular Biology, University of Georgia, Athens, GA, United States.,Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, GA, United States
| |
Collapse
|
136
|
Analysis of a Strong Suppressor of Segregation Distorter in Drosophila melanogaster. Genetics 2020; 215:1085-1105. [PMID: 32561521 DOI: 10.1534/genetics.120.303150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 03/19/2020] [Indexed: 12/30/2022] Open
Abstract
Segregation Di st orter (SD) is a naturally occurring male meiotic drive system in Drosophila melanogaster, characterized by almost exclusive transmission of the SD chromosome owing to dysfunction of sperm receiving the SD+ homolog. Previous studies identified at least three closely linked loci on chromosome 2 required for distortion: Sd, the primary distorting gene; E(SD) (Enhancer of SD), which increases the strength of distortion; and Rsp (Responder), the apparent target of Sd Strength of distortion is also influenced by linked upward modifiers including M(SD) (Modifier of SD) and St(SD) (Stabilizer of SD), and by various unlinked suppressors. Although Sd is known to encode a mutant RanGAP protein, none of the modifiers have been molecularly identified. This work focuses on the genetic and cytological characterization of a strong X-linked suppressor, Su(SD), capable of restoring Mendelian transmission in SD/SD+ males. Sd and its cohort of positive modifiers appear to act semiquantitatively in opposition to Su(SD) with distortion strength depending primarily on the total number of distorting elements rather than which particular elements are present. Su(SD) can also suppress male sterility observed in certain SD genotypes. To facilitate its eventual molecular identification, Su(SD) was localized by deletion mapping to polytene region 13C7-13E4 These studies highlight the polygenic nature of distortion and its dependence on a constellation of positive and negative modifiers, provide insight into the stability of Mendelian transmission in natural populations even when a drive system arises, and pave the way for molecular characterization of Su(SD) whose identity should reveal new information about the mechanism of distortion.
Collapse
|
137
|
Wen Y, Ouyang C, Li Q, Rees TW, Qiu K, Ji L, Chao H. Synthesis, characterization and anticancer mechanism studies of fluorinated cyclometalated ruthenium(ii) complexes. Dalton Trans 2020; 49:7044-7052. [PMID: 32406463 DOI: 10.1039/d0dt01412e] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The drug-resistance of cancer cells has become a major obstacle to the development of clinical drugs for chemotherapy. In order to overcome cisplatin-resistance, seven cyclometalated ruthenium(ii) complexes were synthesized with a varying degree of fluorine substitution, for use as anticancer agents. A cytotoxicity assay testified that the complexes possessed a more cytotoxic effect than cisplatin towards the cisplatin-resistant cell line A549R. The number of fluorine atoms regulated the lipophilicity of the complexes, but the relationship was not linear. Ru1 containing one fluorine atom had the highest lipophilicity and the best therapeutic effect. The complexes enter cells through an energy-dependent pathway and then localize in the nuclei and mitochondria. The complexes induced nuclear dysfunction by the inhibition of DNA replication as well as mitochondrial dysfunction by the loss of membrane potential. The damage to these vital organelles leads to cell apoptosis via the caspase 3/7 pathway. Our results indicated that the modulation of the number of fluorine atoms in therapeutic agents can have a profound effect and Ru1 is a complex with a high potential as a drug for the treatment of cisplatin-resistant cancer.
Collapse
Affiliation(s)
- Ya Wen
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Cheng Ouyang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Quanwen Li
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, P. R. China
| | - Thomas W Rees
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Kangqiang Qiu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Liangnian Ji
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
| | - Hui Chao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. and MOE Key Laboratory of Theoretical Organic Chemistry and Functional Molecule, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 400201, P. R. China
| |
Collapse
|
138
|
Zhang Y, Li S, Zeng C, Huang G, Zhu X, Wang Q, Wang K, Zhou Q, Yan C, Zhang W, Yang G, Liu M, Tao Q, Lei J, Shi Y. Molecular architecture of the luminal ring of the Xenopus laevis nuclear pore complex. Cell Res 2020; 30:532-540. [PMID: 32367042 PMCID: PMC7264284 DOI: 10.1038/s41422-020-0320-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 04/06/2020] [Indexed: 12/23/2022] Open
Abstract
The nuclear pore complex (NPC) mediates the flow of substances between the nucleus and cytoplasm in eukaryotic cells. Here we report the cryo-electron tomography (cryo-ET) structure of the luminal ring (LR) of the NPC from Xenopus laevis oocyte. The observed key structural features of the LR are independently confirmed by single-particle cryo-electron microscopy (cryo-EM) analysis. The LR comprises eight butterfly-shaped subunits, each containing two symmetric wings. Each wing consists of four elongated, tubular protomers. Within the LR subunit, the eight protomers form a Finger domain, which directly contacts the fusion between the inner and outer nuclear membranes and a Grid domain, which serves as a rigid base for the Finger domain. Two neighboring LR subunits interact with each other through the lateral edges of their wings to constitute a Bumper domain, which displays two major conformations and appears to cushion neighboring NPCs. Our study reveals previously unknown features of the LR and potentially explains the elastic property of the NPC.
Collapse
Affiliation(s)
- Yanqing Zhang
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
- Institute of Biology, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
| | - Sai Li
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China
- Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Chao Zeng
- Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Gaoxingyu Huang
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Xuechen Zhu
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
- Institute of Biology, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
| | - Qifan Wang
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
- Institute of Biology, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
| | - Kunpeng Wang
- Tsinghua Computing Facility & Department of Computer Science, Tsinghua University, Beijing, 100084, China
| | - Qiang Zhou
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
- Institute of Biology, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China
| | - Chuangye Yan
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Wusheng Zhang
- Tsinghua Computing Facility & Department of Computer Science, Tsinghua University, Beijing, 100084, China
| | - Guangwen Yang
- Tsinghua Computing Facility & Department of Computer Science, Tsinghua University, Beijing, 100084, China
| | - Minhao Liu
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Qinghua Tao
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Jianlin Lei
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Yigong Shi
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China.
- Institute of Biology, Westlake Institute for Advanced Study, 18 Shilongshan Road, Hangzhou, Zhejiang, 310024, China.
- Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
- Tsinghua University-Peking University Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
| |
Collapse
|
139
|
Springhower CE, Rosen MK, Chook YM. Karyopherins and condensates. Curr Opin Cell Biol 2020; 64:112-123. [PMID: 32474299 DOI: 10.1016/j.ceb.2020.04.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/26/2020] [Accepted: 04/04/2020] [Indexed: 01/25/2023]
Abstract
Several aggregation-prone RNA-binding proteins, including FUS, EWS, TAF15, hnRNP A1, hnRNP A2, and TDP-43, are mutated in neurodegenerative diseases. The nuclear-cytoplasmic distribution of these proteins is controlled by proteins in the karyopherin family of nuclear transport factors (Kaps). Recent studies have shown that Kaps not only transport these proteins but also inhibit their self-association/aggregation, acting as molecular chaperones. This chaperone activity is impaired for disease-causing mutants of the RNA-binding proteins. Here, we review physical data on the mechanisms of self-association of several disease-associated RNA-binding proteins, through liquid-liquid phase separation and amyloid fiber formation. In each case, we relate these data to biophysical, biochemical, and cell biological data on the inhibition of self-association by Kaps. Our analyses suggest that Kaps may be effective chaperones because they contain large surfaces with diverse physical properties that enable them to engage multiple different regions of their cargo proteins, blocking self-association.
Collapse
Affiliation(s)
- Charis E Springhower
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Michael K Rosen
- Department of Biophysics and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.
| | - Yuh Min Chook
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
| |
Collapse
|
140
|
Functional analysis of an essential Ran-binding protein gene, CpRbp1, from the chestnut blight fungus Cryphonectria parasitica using heterokaryon rescue. Sci Rep 2020; 10:8111. [PMID: 32415177 PMCID: PMC7229160 DOI: 10.1038/s41598-020-65036-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 04/24/2020] [Indexed: 12/11/2022] Open
Abstract
A Ran binding protein (RanBP) homolog, CpRbp1, from Cryphonectria parasitica, has been identified as a protein that is affected by hypovirus infection or tannic acid supplementation. In this study, functional analyses of CpRbp1 were performed by constructing a knockout mutant and analyzing the resulting heterokaryon. Transformation-mediated gene replacement resulted in two putative CpRbp1-null mutants and genotype analyses identified these two mutants as heterokaryotic transformants consisting of two types of nuclei, one with the wild-type CpRbp1 allele and another with the CpRbp1-null mutant allele. Although stable mycelial growth of the heterokaryotic transformant was observed on selective medium containing hygromycin B, neither germination nor growth of the resulting conidia, which were single-cell monokaryotic progeny, was observed on the medium. In trans complementation of heterokaryons using a full-length wild-type allele of the CpRbp1 gene resulted in complemented transformants. These transformants sporulated single-cell monokaryotic conidia that were able to grow on media selective for replacing and/or complementing markers. These results clearly indicate that CpRbp1 is an essential gene, and heterokaryons allowed the fungus to maintain lethal CpRbp1-null mutant nuclei. Moreover, in trans complementation of heterokaryons using chimeric structures of the CpRbp1 gene allowed for analysis of its functional domains, which was previously hampered due to the lethality of the gene. In addition, in trans complementation using heterologous RanBP genes from Aspergillus nidulans was successful, suggesting that the function of RanBP is conserved during evolution. Furthermore, in trans complementation allowed for functional analyses of lethal orthologs. This study demonstrates that our fungal heterokaryon system can be applied effectively to determine whether a gene of interest is essential, perform functional analyses of a lethal gene, and analyze corresponding heterologous genes.
Collapse
|
141
|
Molecular anatomy of the subcellular localization and nuclear import mechanism of herpes simplex virus 1 UL6. Aging (Albany NY) 2020; 12:5751-5763. [PMID: 32235005 PMCID: PMC7185102 DOI: 10.18632/aging.102965] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 02/08/2020] [Indexed: 12/24/2022]
Abstract
As an indispensable structure protein, the herpes simplex virus 1 (HSV-1) UL6 has been described to exert numerous roles in viral proliferation. However, its exact subcellular localization and subcellular transport mechanism is not well known. In the present study, by utilizing confocal fluorescent microscopy, UL6 was shown to mainly locate in the nucleus in enhanced yellow fluorescent protein or Flag tag fused expression plasmid-transfected cells or HSV-1-infected cells, whereas its predicted nuclear localization signal was nonfunctional. In addition, by exploiting dominant negative mutant and inhibitor of different nuclear import receptors, as well as co-immunoprecipitation and RNA interference assays, UL6 was established to interact with importin α1, importin α7 and transportin-1 to mediate its nuclear translocation under the help of Ran-mediated GTP hydrolysis. Accordingly, these results will advance the knowledge of UL6-mediated biological significances in HSV-1 infection cycle.
Collapse
|
142
|
Tenenbaum D, Marrone JI, Grecco HE, Ventura AC. Robustness in spatially driven bistability in signaling systems. Sci Rep 2020; 10:5591. [PMID: 32221383 PMCID: PMC7101377 DOI: 10.1038/s41598-020-62412-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 03/13/2020] [Indexed: 11/09/2022] Open
Abstract
Biological systems are spatially organized. This microscopic heterogeneity has been shown to produce emergent complex behaviors such as bistability. Even though the connection between spatiality and dynamic response is essential to understand biological output, its robustness and extent has not been sufficiently explored. This work focuses on a previously described system which is composed of two monostable modules acting on different cellular compartments and sharing species through linear shuttling reactions. One of the two main purposes of this paper is to quantify the frequency of occurrence of bistability throughout the parameter space and to identify which parameters and in which value ranges control the emergence and the properties of bistability. We found that a very small fraction of the sampled parameter space produced a bistable response. Most importantly, shuttling parameters were among the most influential ones to control this property. The other goal of this paper is to simplify the same system as much as possible without losing compartment-induced bistability. This procedure provided a simplified model that still connects two monostable systems by a reduced set of linear shuttling reactions that circulates all the species around the two compartments. Bistable systems are one of the main building blocks of more complex behaviors such as oscillations, memory, and digitalization. Therefore, we expect that the proposed minimal system provides insight into how these behaviors can arise from compartmentalization.
Collapse
Affiliation(s)
- Debora Tenenbaum
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina.,Department of Physiology, Molecular and Cellular Biology, University of Buenos Aires, Buenos Aires, Argentina.,Department of Physics, Brandeis University, Waltham, MA 02454 and Department of Biochemistry, Brandeis University, Waltham, MA, 02454, USA
| | - Juan Ignacio Marrone
- Department of Physiology, Molecular and Cellular Biology, University of Buenos Aires, Buenos Aires, Argentina.,Institute of Physiology, Molecular Biology and Neurosciences, National Research Council (CONICET), Buenos Aires, Argentina
| | - Hernán E Grecco
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina. .,Physics Institute of Buenos Aires, National Research Council (CONICET), Buenos Aires, Argentina.
| | - Alejandra C Ventura
- Department of Physiology, Molecular and Cellular Biology, University of Buenos Aires, Buenos Aires, Argentina. .,Institute of Physiology, Molecular Biology and Neurosciences, National Research Council (CONICET), Buenos Aires, Argentina.
| |
Collapse
|
143
|
Swale C, Da Costa B, Sedano L, Garzoni F, McCarthy AA, Berger I, Bieniossek C, Ruigrok RWH, Delmas B, Crépin T. X-ray Structure of the Human Karyopherin RanBP5, an Essential Factor for Influenza Polymerase Nuclear Trafficking. J Mol Biol 2020; 432:3353-3359. [PMID: 32222384 DOI: 10.1016/j.jmb.2020.03.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/16/2020] [Accepted: 03/22/2020] [Indexed: 12/15/2022]
Abstract
Here, we describe the crystal structures of two distinct isoforms of ligand-free human karyopherin RanBP5 and investigate its global propensity to interact with influenza A virus polymerase. Our results confirm the general architecture and mechanism of the IMB3 karyopherin-β subfamily whilst also highlighting differences with the yeast orthologue Kap121p. Moreover, our results provide insight into the structural flexibility of β-importins in the unbound state. Based on docking of a nuclear localisation sequence, point mutations were designed, which suppress influenza PA-PB1 subcomplex binding to RanBP5 in a binary protein complementation assay.
Collapse
Affiliation(s)
- Christopher Swale
- Institut de Biologie Structurale (IBS), University Grenoble Alpes, CEA, CNRS, 38044 Grenoble, France; EMBL Grenoble Outstation, 71 Avenue des Martyrs, BP181, F-38042 Grenoble Cedex 9, France
| | - Bruno Da Costa
- Virologie et Immunologie Moléculaires, INRA, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Laura Sedano
- Virologie et Immunologie Moléculaires, INRA, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Frédéric Garzoni
- EMBL Grenoble Outstation, 71 Avenue des Martyrs, BP181, F-38042 Grenoble Cedex 9, France
| | - Andrew A McCarthy
- EMBL Grenoble Outstation, 71 Avenue des Martyrs, BP181, F-38042 Grenoble Cedex 9, France
| | - Imre Berger
- EMBL Grenoble Outstation, 71 Avenue des Martyrs, BP181, F-38042 Grenoble Cedex 9, France; Max Planck Centre for Minimal Biology, University of Bristol, Clifton BS8 1TD, United Kingdom
| | - Christoph Bieniossek
- Roche Innovation Centre, Basel, Switzerland F. Hoffmann-La Roche AG, Grenzacherstrasse 124, CH-4070 Basel, Switzerland
| | - Rob W H Ruigrok
- Institut de Biologie Structurale (IBS), University Grenoble Alpes, CEA, CNRS, 38044 Grenoble, France
| | - Bernard Delmas
- Virologie et Immunologie Moléculaires, INRA, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Thibaut Crépin
- Institut de Biologie Structurale (IBS), University Grenoble Alpes, CEA, CNRS, 38044 Grenoble, France.
| |
Collapse
|
144
|
Yu W, Liu R, Zhou Y, Gao H. Size-Tunable Strategies for a Tumor Targeted Drug Delivery System. ACS CENTRAL SCIENCE 2020; 6:100-116. [PMID: 32123729 PMCID: PMC7047275 DOI: 10.1021/acscentsci.9b01139] [Citation(s) in RCA: 243] [Impact Index Per Article: 60.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Indexed: 05/18/2023]
Abstract
Nanoparticles have been widely used in tumor targeted drug delivery, while the antitumor effects are not always satisfactory due to the limited penetration and retention. As we all know, there is a paradox that nanoparticles with large sizes tend to distribute around tumor blood vessels rather than penetrate into tumor parenchyma, while smaller sizes can penetrate deeply but with poor tumor retention. In recent days, an intelligent, size-tunable strategy provided a solution to determine the size problem of nanoparticles and exhibited good application prospects. In this review, we summarize series of stimuli-induced aggregation and shrinkage strategies for tumor targeted drug delivery, which can significantly increase the retention and penetration of nanodrugs in tumor sites at the same time, thus promoting treatment efficacy. Internal (enzymes, pH, and redox) and external (light and temperature) stimuli are introduced to change the morphology of the original nanodrugs through protonation, hydrophobization, hydrogen bond, π-π stacking and enzymolysis-resulted click reactions or dissociation, etc. Apart from applications in oncotherapy, size-tunable strategies also have a great prospect in the diagnosis and real time bioimaging fields, which are also introduced in this review. Finally, the potential challenges for application and future directions are thoroughly discussed, providing guidance for further clinical transformation.
Collapse
Affiliation(s)
| | | | - Yang Zhou
- Key Laboratory of Drug-Targeting
and Drug Delivery System of the Education Ministry and Sichuan Province,
Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan
Research Center for Drug Precision Industrial Technology, West China
School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Huile Gao
- Key Laboratory of Drug-Targeting
and Drug Delivery System of the Education Ministry and Sichuan Province,
Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan
Research Center for Drug Precision Industrial Technology, West China
School of Pharmacy, Sichuan University, Chengdu 610041, China
| |
Collapse
|
145
|
Cai M, Wang P, Wang Y, Chen T, Xu Z, Zou X, Ou X, Li Y, Chen D, Peng T, Li M. Identification of the molecular determinants for nuclear import of PRV EP0. Biol Chem 2020; 400:1385-1394. [PMID: 31120855 DOI: 10.1515/hsz-2019-0201] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 05/12/2019] [Indexed: 12/12/2022]
Abstract
Pseudorabies virus (PRV) early protein EP0 is a homologue of the herpes simplex virus 1 (HSV-1) immediate-early protein ICP0, which is a multifunctional protein and important for HSV-1 infection. However, the definite function of EP0 during PRV infection is not clear. In this study, to determine if EP0 might localize to the nucleus, as it is shown for its homologue in HSV-1, the subcellular localization pattern and molecular determinants for the nuclear import of EP0 were investigated. EP0 was demonstrated to predominantly target the nucleus in both PRV infected- and plasmid-transfected cells. Furthermore, the nuclear import of EP0 was shown to be dependent on the Ran-, importin α1-, α3-, α7-, β1- and transportin-1-mediated multiple pathways. Taken together, these data will open up new horizons for portraying the biological roles of EP0 in the course of PRV lytic cycle.
Collapse
Affiliation(s)
- Mingsheng Cai
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Ping Wang
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Yuanfang Wang
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Tao Chen
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Zuo Xu
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Xingmei Zou
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Xiaowen Ou
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Yiwen Li
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Daixiong Chen
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| | - Tao Peng
- State Key Laboratory of Respiratory Diseases, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, Xinzao Town, Panyu, Guangzhou 511436, Guangdong, China.,South China Vaccine Corporation Limited, Guangzhou Science Park, Guangzhou 510663, Guangdong, China
| | - Meili Li
- Guangdong Provincial Key Laboratory of Allergy and Clinical Immunology, Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.,Department of Pathogenic Biology and Immunology, Sino-French Hoffmann Institute, School of Basic Medical Science, Guangzhou Medical University, No. 250 Changgang Dong Road, Haizhu District, Guangzhou 510260, Guangdong, China
| |
Collapse
|
146
|
Barbato S, Kapinos LE, Rencurel C, Lim RYH. Karyopherin enrichment at the nuclear pore complex attenuates Ran permeability. J Cell Sci 2020; 133:jcs238121. [PMID: 31932502 DOI: 10.1242/jcs.238121] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 12/13/2019] [Indexed: 12/25/2022] Open
Abstract
Ran is a small GTPase whose nucleotide-bound forms cycle through nuclear pore complexes (NPCs) to direct nucleocytoplasmic transport (NCT). Generally, Ran guanosine triphosphate (RanGTP) binds cargo-carrying karyopherin receptors (Kaps) in the nucleus and releases them into the cytoplasm following hydrolysis to Ran guanosine diphosphate (RanGDP). This generates a remarkably steep Ran gradient across the nuclear envelope that sustains compartment-specific cargo delivery and accumulation. However, because NPCs are permeable to small molecules of comparable size, it is unclear how an uncontrolled mixing of RanGTP and RanGDP is prevented. Here, we find that an NPC-enriched pool of karyopherin subunit beta 1 (KPNB1, hereafter referred to as Kapβ1) selectively mediates Ran diffusion across the pore but not passive molecules of similar size (e.g. GFP). This is due to RanGTP having a stronger binding interaction with Kapβ1 than RanGDP. For this reason, the RanGDP importer, nuclear transport factor 2, facilitates the return of RanGDP into the nucleus following GTP hydrolysis. Accordingly, the enrichment of Kapβ1 at NPCs may function as a retention mechanism that preserves the sharp transition of RanGTP and RanGDP in the nucleus and cytoplasm, respectively.
Collapse
Affiliation(s)
- Suncica Barbato
- Biozentrum & The Swiss Nanoscience Institute, University of Basel, 4056 Basel, Switzerland
| | - Larisa E Kapinos
- Biozentrum & The Swiss Nanoscience Institute, University of Basel, 4056 Basel, Switzerland
| | - Chantal Rencurel
- Biozentrum & The Swiss Nanoscience Institute, University of Basel, 4056 Basel, Switzerland
| | - Roderick Y H Lim
- Biozentrum & The Swiss Nanoscience Institute, University of Basel, 4056 Basel, Switzerland
| |
Collapse
|
147
|
Zelmer C, Zweifel LP, Kapinos LE, Craciun I, Güven ZP, Palivan CG, Lim RYH. Organelle-specific targeting of polymersomes into the cell nucleus. Proc Natl Acad Sci U S A 2020; 117:2770-2778. [PMID: 31988132 PMCID: PMC7022206 DOI: 10.1073/pnas.1916395117] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Organelle-specific nanocarriers (NCs) are highly sought after for delivering therapeutic agents into the cell nucleus. This necessitates nucleocytoplasmic transport (NCT) to bypass nuclear pore complexes (NPCs). However, little is known as to how comparably large NCs infiltrate this vital intracellular barrier to enter the nuclear interior. Here, we developed nuclear localization signal (NLS)-conjugated polymersome nanocarriers (NLS-NCs) and studied the NCT mechanism underlying their selective nuclear uptake. Detailed chemical, biophysical, and cellular analyses show that karyopherin receptors are required to authenticate, bind, and escort NLS-NCs through NPCs while Ran guanosine triphosphate (RanGTP) promotes their release from NPCs into the nuclear interior. Ultrastructural analysis by regressive staining transmission electron microscopy further resolves the NLS-NCs on transit in NPCs and inside the nucleus. By elucidating their ability to utilize NCT, these findings demonstrate the efficacy of polymersomes to deliver encapsulated payloads directly into cell nuclei.
Collapse
Affiliation(s)
- Christina Zelmer
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, CH-4056 Basel, Switzerland
- Department of Chemistry, University of Basel, CH-4002 Basel, Switzerland
| | - Ludovit P Zweifel
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, CH-4056 Basel, Switzerland
| | - Larisa E Kapinos
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, CH-4056 Basel, Switzerland
| | - Ioana Craciun
- Department of Chemistry, University of Basel, CH-4002 Basel, Switzerland
| | - Zekiye P Güven
- Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, CH-4002 Basel, Switzerland;
| | - Roderick Y H Lim
- Biozentrum and the Swiss Nanoscience Institute, University of Basel, CH-4056 Basel, Switzerland;
| |
Collapse
|
148
|
Zhang X, Fan S, Zhang L, Shi Y. Glucagon-like peptide-1 receptor undergoes importin-α-dependent nuclear localization in rat aortic smooth muscle cells. FEBS Lett 2020; 594:1506-1516. [PMID: 32010959 DOI: 10.1002/1873-3468.13751] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Revised: 01/21/2020] [Accepted: 01/29/2020] [Indexed: 11/08/2022]
Abstract
Glucagon-like peptide 1 receptor (GLP-1R) belongs to the family B of G protein-coupled receptors (GPCRs) and has antidiabetic and cardioprotective effects. Classical GLP-1R at the plasma membrane undergoes desensitization and internalization and is recycled back to the plasma membrane under the control of GLP-1 in islet β-cells. However, the subcellular localization of GLP-1R in the vascular system remains unclear. Here, we find that GLP-1R is localized in the nucleus of rat aortic smooth muscle cells (RASMCs) and in the tunica media. We identify a functional nuclear localization signal (NLS; 412-442aa) at the C-terminal region of GLP-1R. Nuclear import of GLP-1R is mediated by an importin-α-dependent pathway and regulated by phosphorylation of Ser416 in the NLS. Upon leaving the nucleus, GLP-1R promotes cell proliferation in RASMCs. These findings may provide insights into the cardiovascular functions of GLP-1R.
Collapse
Affiliation(s)
- Xin Zhang
- Key Laboratory of Chemical Biology and Molecular Engineering, Ministry of Education, Institute of Biotechnology, Shanxi University, Taiyuan, China
| | - Shaohua Fan
- Key Laboratory of Chemical Biology and Molecular Engineering, Ministry of Education, Institute of Biotechnology, Shanxi University, Taiyuan, China
| | - Lihui Zhang
- Shanxi Bethune Hospital, Taiyuan, Shanxi, China
| | - Yawei Shi
- Key Laboratory of Chemical Biology and Molecular Engineering, Ministry of Education, Institute of Biotechnology, Shanxi University, Taiyuan, China
| |
Collapse
|
149
|
Peng SY, Zou MZ, Zhang CX, Ma JB, Zeng X, Xiao W. Fabrication of rapid-biodegradable nano-vectors for endosomal-triggered drug delivery. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2019.101450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
150
|
Cytoplasmic Parvovirus Capsids Recruit Importin Beta for Nuclear Delivery. J Virol 2020; 94:JVI.01532-19. [PMID: 31748386 DOI: 10.1128/jvi.01532-19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 11/16/2019] [Indexed: 02/06/2023] Open
Abstract
Parvoviruses are an important platform for gene and cancer therapy. Their cell entry and the following steps, including nuclear import, are inefficient, limiting their use in therapeutic applications. Two models exist on parvoviral nuclear entry: the classical import of the viral capsid using nuclear transport receptors of the importin (karyopherin) family or the direct attachment of the capsid to the nuclear pore complex leading to the local disintegration of the nuclear envelope. Here, by laser scanning confocal microscopy and in situ proximity ligation analyses combined with coimmunoprecipitation, we show that infection requires importin β-mediated access to the nuclear pore complex and nucleoporin 153-mediated interactions on the nuclear side. The importin β-capsid interaction continued within the nucleoplasm, which suggests a mixed model of nuclear entry in which the classical nuclear import across the nuclear pore complex is accompanied by transient ruptures of the nuclear envelope, also allowing the passive entry of importin β-capsid complexes into the nucleus.IMPORTANCE Parvoviruses are small DNA viruses that deliver their DNA into the postmitotic nuclei, which is an important step for parvoviral gene and cancer therapies. Limitations in virus-receptor interactions or endocytic entry do not fully explain the low transduction/infection efficiency, indicating a bottleneck after virus entry into the cytoplasm. We thus investigated the transfer of parvovirus capsids from the cytoplasm to the nucleus, showing that the nuclear import of the parvovirus capsid follows a unique strategy, which differs from classical nuclear import and those of other viruses.
Collapse
|