1
|
The Actin Binding Protein Plastin-3 Is Involved in the Pathogenesis of Acute Myeloid Leukemia. Cancers (Basel) 2019; 11:cancers11111663. [PMID: 31717802 PMCID: PMC6895973 DOI: 10.3390/cancers11111663] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 10/24/2019] [Accepted: 10/25/2019] [Indexed: 12/19/2022] Open
Abstract
Leukemia-initiating cells reside within the bone marrow in specialized niches where they undergo complex interactions with their surrounding stromal cells. We have identified the actin-binding protein Plastin-3 (PLS3) as potential player within the leukemic bone marrow niche and investigated its functional role in acute myeloid leukemia. High expression of PLS3 was associated with a poor overall and event-free survival for AML patients. These findings were supported by functional in vitro and in vivo experiments. AML cells with a PLS3 knockdown showed significantly reduced colony numbers in vitro while the PLS3 overexpression variants resulted in significantly enhanced colony numbers compared to their respective controls. Furthermore, the survival of NSG mice transplanted with the PLS3 knockdown cells showed a significantly prolonged survival in comparison to mice transplanted with the control AML cells. Further studies should focus on the underlying leukemia-promoting mechanisms and investigate PLS3 as therapeutic target.
Collapse
|
2
|
Teixeira MB, Alborghetti MR, Kobarg J. Fasciculation and elongation zeta proteins 1 and 2: From structural flexibility to functional diversity. World J Biol Chem 2019; 10:28-43. [PMID: 30815230 PMCID: PMC6388297 DOI: 10.4331/wjbc.v10.i2.28] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 01/02/2019] [Accepted: 01/28/2019] [Indexed: 02/05/2023] Open
Abstract
Fasciculation and elongation zeta/zygin (FEZ) proteins are a family of hub proteins and share many characteristics like high connectivity in interaction networks, they are involved in several cellular processes, evolve slowly and in general have intrinsically disordered regions. In 1985, unc-76 gene was firstly described and involved in axonal growth in C. elegans, and in 1997 Bloom and Horvitz enrolled also the human homologues genes, FEZ1 and FEZ2, in this process. While nematodes possess one gene (unc-76), mammalians have one more copy (FEZ1 and FEZ2). Several animal models have been used to study FEZ family functions like: C. elegans, D. melanogaster, R. novergicus and human cells. Complementation assays were performed and demonstrated the function conservation between paralogues. Human FEZ1 protein is more studied followed by UNC-76 and FEZ2 proteins, respectively. While FEZ1 and UNC-76 shared interaction partners, FEZ2 evolved and increased the number of protein-protein interactions (PPI) with cytoplasmatic partners. FEZ proteins are implicated in intracellular transport, acting as bivalent cargo transport adaptors in kinesin-mediated movement. Especially in light of this cellular function, this family of proteins has been involved in several processes like neuronal development, neurological disorders, viral infection and autophagy. However, nuclear functions of FEZ proteins have been explored as well, due to high content of PPI with nuclear proteins, correlating FEZ1 expression to Sox2 and Hoxb4 gene regulation and retinoic acid signaling. These recent findings open new avenue to study FEZ proteins functions and its involvement in already described processes. This review intends to reunite aspects of evolution, structure, interaction partners and function of FEZ proteins and correlate them to physiological and pathological processes.
Collapse
Affiliation(s)
- Mariana Bertini Teixeira
- Institute of Biology, Department of Biochemistry and Tissue Biology, University of Campinas, Campinas 13083-862, Brazil
| | | | - Jörg Kobarg
- Institute of Biology, Department of Biochemistry and Tissue Biology, University of Campinas, Campinas 13083-862, Brazil
- Faculty of Pharmaceutical Sciences, University of Campinas, Campinas 13083-862, Brazil
| |
Collapse
|
3
|
Gonçalves LR, de Oliveira da Silva B, Scarinci LD, Ramos LF, Moraes KC. MicroRNA-1254 contributes to the controlling of pro-fibrogenic environment in LX-2 cells by modulating SMAD3 and wound repair: new insights in hepatic fibrosis. Cell Biol Int 2019; 43:333-343. [DOI: 10.1002/cbin.11075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 11/15/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Letícia Rocha Gonçalves
- Laboratório de Biologia Molecular, Departamento de Biologia; Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho” − Campus Rio Claro; Rio Claro SP 13506-900 Brazil
| | | | - Letícia Destefani Scarinci
- Laboratório de Biologia Molecular, Departamento de Biologia; Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho” − Campus Rio Claro; Rio Claro SP 13506-900 Brazil
| | - Letícia Ferreira Ramos
- Laboratório de Biologia Molecular, Departamento de Biologia; Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho” − Campus Rio Claro; Rio Claro SP 13506-900 Brazil
| | - Karen C.M. Moraes
- Laboratório de Biologia Molecular, Departamento de Biologia; Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho” − Campus Rio Claro; Rio Claro SP 13506-900 Brazil
| |
Collapse
|
4
|
Bertini Teixeira M, Figueira ACM, Furlan AS, Aquino B, Alborghetti MR, Paes Leme AF, Wei LN, Kobarg J. Fasciculation and elongation zeta-1 protein (FEZ1) interacts with the retinoic acid receptor and participates in transcriptional regulation of the Hoxb4 gene. FEBS Open Bio 2017; 8:4-14. [PMID: 29321952 PMCID: PMC5757173 DOI: 10.1002/2211-5463.12338] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 08/27/2017] [Accepted: 10/13/2017] [Indexed: 01/18/2023] Open
Abstract
Fasciculation and elongation zeta‐1 (FEZ1) protein is involved in axon outgrowth and is highly expressed in the brain. It has multiple interaction partners, with functions varying from the regulation of neuronal development and intracellular transport mechanisms to transcription regulation. One of its interactors is retinoic acid receptor (RAR), which is activated by retinoic acid and controls many target genes and physiological process. Based on previous evidence suggesting a possible nuclear role for FEZ1, we wanted to deepen our understanding of this function by addressing the FEZ1–RAR interaction. We performed in vitro binding experiments and assessed the interface of interaction between both proteins. We found that FEZ1–RAR interacted with a similar magnitude as RAR to its responsive element DR5 and that the interaction occurred in the coiled‐coil region of FEZ1 and in the ligand‐binding domain of RAR. Furthermore, cellular experiments were performed in order to confirm the interaction and screen for induced target genes from an 86‐gene panel. The analysis of gene expression showed that only in the presence of retinoic acid did FEZ1 induce hoxb4 gene expression. This finding is consistent with data from the literature showing the hoxb4 gene functionally involved in development and acute myeloid leukemia, as is FEZ1.
Collapse
Affiliation(s)
- Mariana Bertini Teixeira
- Department of Biochemistry and Tissue Biology Institute of Biology University of Campinas Brazil
| | - Ana Carolina M Figueira
- Spectroscopy and Calorimetry Laboratory Brazilian Biosciences National Laboratory Center for Research in Energy and Materials Campinas SP Brazil
| | | | - Bruno Aquino
- Structural Genomics Consortium University of Campinas Brazil
| | - Marcos R Alborghetti
- Department of Pharmaceutical Sciences School of Health Sciences University of Brasilia Brazil
| | - Adriana F Paes Leme
- Mass Spectrometry Laboratory Brazilian Biosciences National Laboratory Center for Research in Energy and Materials Campinas SP Brazil
| | - Li-Na Wei
- Pharmacology Department University of Minnesota Medical School Minneapolis MN USA
| | - Jörg Kobarg
- Department of Biochemistry and Tissue Biology Institute of Biology University of Campinas Brazil.,Faculty of Pharmaceutical Sciences University of Campinas Brazil
| |
Collapse
|
5
|
SUN2 Overexpression Deforms Nuclear Shape and Inhibits HIV. J Virol 2016; 90:4199-4214. [PMID: 26865710 DOI: 10.1128/jvi.03202-15] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 02/03/2016] [Indexed: 12/25/2022] Open
Abstract
UNLABELLED In a previous screen of putative interferon-stimulated genes, SUN2 was shown to inhibit HIV-1 infection in an uncharacterized manner. SUN2 is an inner nuclear membrane protein belonging to the linker of nucleoskeleton and cytoskeleton complex. We have analyzed here the role of SUN2 in HIV infection. We report that in contrast to what was initially thought, SUN2 is not induced by type I interferon, and that SUN2 silencing does not modulate HIV infection. However, SUN2 overexpression in cell lines and in primary monocyte-derived dendritic cells inhibits the replication of HIV but not murine leukemia virus or chikungunya virus. We identified HIV-1 and HIV-2 strains that are unaffected by SUN2, suggesting that the effect is specific to particular viral components or cofactors. Intriguingly, SUN2 overexpression induces a multilobular flower-like nuclear shape that does not impact cell viability and is similar to that of cells isolated from patients with HTLV-I-associated adult T-cell leukemia or with progeria. Nuclear shape changes and HIV inhibition both mapped to the nucleoplasmic domain of SUN2 that interacts with the nuclear lamina. This block to HIV replication occurs between reverse transcription and nuclear entry, and passaging experiments selected for a single-amino-acid change in capsid (CA) that leads to resistance to overexpressed SUN2. Furthermore, using chemical inhibition or silencing of cyclophilin A (CypA), as well as CA mutant viruses, we implicated CypA in the SUN2-imposed block to HIV infection. Our results demonstrate that SUN2 overexpression perturbs both nuclear shape and early events of HIV infection. IMPORTANCE Cells encode proteins that interfere with viral replication, a number of which have been identified in overexpression screens. SUN2 is a nuclear membrane protein that was shown to inhibit HIV infection in such a screen, but how it blocked HIV infection was not known. We show that SUN2 overexpression blocks the infection of certain strains of HIV before nuclear entry. Mutation of the viral capsid protein yielded SUN2-resistant HIV. Additionally, the inhibition of HIV infection by SUN2 involves cyclophilin A, a protein that binds the HIV capsid and directs subsequent steps of infection. We also found that SUN2 overexpression substantially changes the shape of the cell's nucleus, resulting in many flower-like nuclei. Both HIV inhibition and deformation of nuclear shape required the domain of SUN2 that interacts with the nuclear lamina. Our results demonstrate that SUN2 interferes with HIV infection and highlight novel links between nuclear shape and viral infection.
Collapse
|
6
|
Malikov V, da Silva ES, Jovasevic V, Bennett G, de Souza Aranha Vieira DA, Schulte B, Diaz-Griffero F, Walsh D, Naghavi MH. HIV-1 capsids bind and exploit the kinesin-1 adaptor FEZ1 for inward movement to the nucleus. Nat Commun 2015; 6:6660. [PMID: 25818806 PMCID: PMC4380233 DOI: 10.1038/ncomms7660] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 02/17/2015] [Indexed: 12/11/2022] Open
Abstract
Intracellular transport of cargos, including many viruses, involves directed movement on microtubules mediated by motor proteins. Although a number of viruses bind motors of opposing directionality, how they associate with and control these motors to accomplish directed movement remains poorly understood. Here we show that human immunodeficiency virus type 1 (HIV-1) associates with the kinesin-1 adaptor protein, Fasiculation and Elongation Factor zeta 1 (FEZ1). RNAi-mediated FEZ1 depletion blocks early infection, with virus particles exhibiting bi-directional motility but no net movement to the nucleus. Furthermore, both dynein and kinesin-1 motors are required for HIV-1 trafficking to the nucleus. Finally, the ability of exogenously expressed FEZ1 to promote early HIV-1 infection requires binding to kinesin-1. Our findings demonstrate that opposing motors both contribute to early HIV-1 movement and identify the kinesin-1 adaptor, FEZ1 as a capsid-associated host regulator of this process usurped by HIV-1 to accomplish net inward movement towards the nucleus.
Collapse
Affiliation(s)
- Viacheslav Malikov
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.,Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA
| | - Eveline Santos da Silva
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA
| | - Vladimir Jovasevic
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA
| | - Geoffrey Bennett
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA
| | | | - Bianca Schulte
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Felipe Diaz-Griffero
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Derek Walsh
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA
| | - Mojgan H Naghavi
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.,Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA
| |
Collapse
|
7
|
Alborghetti MR, Furlan ADS, da Silva JC, Sforça ML, Honorato RV, Granato DC, dos Santos Migueleti DL, Neves JL, de Oliveira PSL, Paes-Leme AF, Zeri ACDM, de Torriani ICL, Kobarg J. Structural analysis of intermolecular interactions in the kinesin adaptor complex fasciculation and elongation protein zeta 1/ short coiled-coil protein (FEZ1/SCOCO). PLoS One 2013; 8:e76602. [PMID: 24116125 PMCID: PMC3792052 DOI: 10.1371/journal.pone.0076602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 08/29/2013] [Indexed: 01/15/2023] Open
Abstract
Cytoskeleton and protein trafficking processes, including vesicle transport to synapses, are key processes in neuronal differentiation and axon outgrowth. The human protein FEZ1 (fasciculation and elongation protein zeta 1 / UNC-76, in C. elegans), SCOCO (short coiled-coil protein / UNC-69) and kinesins (e.g. kinesin heavy chain / UNC116) are involved in these processes. Exploiting the feature of FEZ1 protein as a bivalent adapter of transport mediated by kinesins and FEZ1 protein interaction with SCOCO (proteins involved in the same path of axonal growth), we investigated the structural aspects of intermolecular interactions involved in this complex formation by NMR (Nuclear Magnetic Resonance), cross-linking coupled with mass spectrometry (MS), SAXS (Small Angle X-ray Scattering) and molecular modelling. The topology of homodimerization was accessed through NMR (Nuclear Magnetic Resonance) studies of the region involved in this process, corresponding to FEZ1 (92-194). Through studies involving the protein in its monomeric configuration (reduced) and dimeric state, we propose that homodimerization occurs with FEZ1 chains oriented in an anti-parallel topology. We demonstrate that the interaction interface of FEZ1 and SCOCO defined by MS and computational modelling is in accordance with that previously demonstrated for UNC-76 and UNC-69. SAXS and literature data support a heterotetrameric complex model. These data provide details about the interaction interfaces probably involved in the transport machinery assembly and open perspectives to understand and interfere in this assembly and its involvement in neuronal differentiation and axon outgrowth.
Collapse
Affiliation(s)
- Marcos Rodrigo Alborghetti
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Ariane da Silva Furlan
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
- Departamento de Bioquímica-Programa de Pós-graduação em Biologia Funcional e Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brasil
| | - Júlio César da Silva
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Maurício Luís Sforça
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Rodrigo Vargas Honorato
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Daniela Campos Granato
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Deivid Lucas dos Santos Migueleti
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
- Departamento de Genética, Evolução e Bioagentes, Programa de Pós-graduação em Genética e Biologia Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brasil
| | - Jorge L. Neves
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Paulo Sergio Lopes de Oliveira
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Adriana Franco Paes-Leme
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
| | - Ana Carolina de Mattos Zeri
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
- Departamento de Bioquímica-Programa de Pós-graduação em Biologia Funcional e Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brasil
| | | | - Jörg Kobarg
- Laboratório Nacional de Biociências-LNBio, Centro Nacional de Pesquisa em Energia e Materiais-CNPEM, Campinas, SP, Brasil
- Departamento de Bioquímica-Programa de Pós-graduação em Biologia Funcional e Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brasil
- Departamento de Genética, Evolução e Bioagentes, Programa de Pós-graduação em Genética e Biologia Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, SP, Brasil
| |
Collapse
|
8
|
Alborghetti MR, Furlan AS, Kobarg J. FEZ2 has acquired additional protein interaction partners relative to FEZ1: functional and evolutionary implications. PLoS One 2011; 6:e17426. [PMID: 21408165 PMCID: PMC3050892 DOI: 10.1371/journal.pone.0017426] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Accepted: 02/04/2011] [Indexed: 12/16/2022] Open
Abstract
Background The FEZ (fasciculation and elongation protein zeta) family designation was purposed by Bloom and Horvitz by genetic analysis of C. elegans unc-76. Similar human sequences were identified in the expressed sequence tag database as FEZ1 and FEZ2. The unc-76 function is necessary for normal axon fasciculation and is required for axon-axon interactions. Indeed, the loss of UNC-76 function results in defects in axonal transport. The human FEZ1 protein has been shown to rescue defects caused by unc-76 mutations in nematodes, indicating that both UNC-76 and FEZ1 are evolutionarily conserved in their function. Until today, little is known about FEZ2 protein function. Methodology/Principal Findings Using the yeast two-hybrid system we demonstrate here conserved evolutionary features among orthologs and non-conserved features between paralogs of the FEZ family of proteins, by comparing the interactome profiles of the C-terminals of human FEZ1, FEZ2 and UNC-76 from C. elegans. Furthermore, we correlate our data with an analysis of the molecular evolution of the FEZ protein family in the animal kingdom. Conclusions/Significance We found that FEZ2 interacted with 59 proteins and that of these only 40 interacted with FEZ1. Of the 40 FEZ1 interacting proteins, 36 (90%), also interacted with UNC-76 and none of the 19 FEZ2 specific proteins interacted with FEZ1 or UNC-76. This together with the duplication of unc-76 gene in the ancestral line of chordates suggests that FEZ2 is in the process of acquiring new additional functions. The results provide also an explanation for the dramatic difference between C. elegans and D. melanogaster unc-76 mutants on one hand, which cause serious defects in the nervous system, and the mouse FEZ1 -/- knockout mice on the other, which show no morphological and no strong behavioural phenotype. Likely, the ubiquitously expressed FEZ2 can completely compensate the lack of neuronal FEZ1, since it can interact with all FEZ1 interacting proteins and additional 19 proteins.
Collapse
Affiliation(s)
- Marcos R. Alborghetti
- Laboratório Nacional de Biociências, Centro Nacional de Pesquisa em Energia e Materiais, Campinas, São Paulo, Brasil
- Departamento de Bioquímica-Programa de Pós-graduação em Biologia Funcional e Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brasil
| | - Ariane S. Furlan
- Laboratório Nacional de Biociências, Centro Nacional de Pesquisa em Energia e Materiais, Campinas, São Paulo, Brasil
- Departamento de Bioquímica-Programa de Pós-graduação em Biologia Funcional e Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brasil
| | - Jörg Kobarg
- Laboratório Nacional de Biociências, Centro Nacional de Pesquisa em Energia e Materiais, Campinas, São Paulo, Brasil
- Departamento de Bioquímica-Programa de Pós-graduação em Biologia Funcional e Molecular, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brasil
- * E-mail:
| |
Collapse
|
9
|
Increased cellular apoptosis susceptibility (CSE1L/CAS) protein expression promotes protrusion extension and enhances migration of MCF-7 breast cancer cells. Exp Cell Res 2010; 316:2969-81. [DOI: 10.1016/j.yexcr.2010.07.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 07/22/2010] [Accepted: 07/29/2010] [Indexed: 11/24/2022]
|
10
|
Lanza DCF, Meirelles GV, Alborghetti MR, Abrile CH, Lenz G, Kobarg J. FEZ1 interacts with CLASP2 and NEK1 through coiled-coil regions and their cellular colocalization suggests centrosomal functions and regulation by PKC. Mol Cell Biochem 2009; 338:35-45. [PMID: 19924516 DOI: 10.1007/s11010-009-0317-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Accepted: 11/03/2009] [Indexed: 01/02/2023]
Abstract
FEZ1 was initially described as a neuronal protein that influences axonal development and cell polarization. CLASP2 and NEK1 proteins are present in a centrosomal complex and participate in cell cycle and cell division mechanisms, but their functions were always described individually. Here, we report that NEK1 and CLASP2 colocalize with FEZ1 in a perinuclear region in mammalian cells, and observed that coiled-coil interactions occur between FEZ1/CLASP2 and FEZ1/NEK1 in vitro. These three proteins colocalize and interact with endogenous gamma-tubulin. Furthermore, we found that CLASP2 is phosphorylated and interacts with active PKC isoforms, and that FEZ1/CLASP2 colocalization is inhibited by PMA treatment. Our results provide evidence that these three proteins cooperate in centrosomal functions and open new directions for future studies.
Collapse
Affiliation(s)
- Daniel C F Lanza
- Centro de Biologia Molecular Estrutural, Associação Brasileira de Tecnologia de Luz Síncrotron, Rua Giuseppe Máximo Scolfaro, Campinas, SP, Brazil
| | | | | | | | | | | |
Collapse
|
11
|
Trindade DM, Silva JC, Navarro MS, Torriani ICL, Kobarg J. Low-resolution structural studies of human Stanniocalcin-1. BMC STRUCTURAL BIOLOGY 2009; 9:57. [PMID: 19712479 PMCID: PMC2744999 DOI: 10.1186/1472-6807-9-57] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Accepted: 08/27/2009] [Indexed: 11/10/2022]
Abstract
BACKGROUND Stanniocalcins (STCs) represent small glycoprotein hormones, found in all vertebrates, which have been functionally implicated in Calcium homeostasis. However, recent data from mammalian systems indicated that they may be also involved in embryogenesis, tumorigenesis and in the context of the latter especially in angiogenesis. Human STC1 is a 247 amino acids protein with a predicted molecular mass of 27 kDa, but preliminary data suggested its di- or multimerization. The latter in conjunction with alternative splicing and/or post-translational modification gives rise to forms described as STC50 and "big STC", which molecular weights range from 56 to 135 kDa. RESULTS In this study we performed a biochemical and structural analysis of STC1 with the aim of obtaining low resolution structural information about the human STC1, since structural information in this protein family is scarce. We expressed STC1 in both E. coli and insect cells using the baculo virus system with a C-terminal 6 x His fusion tag. From the latter we obtained reasonable amounts of soluble protein. Circular dichroism analysis showed STC1 as a well structured protein with 52% of alpha-helical content. Mass spectroscopy analysis of the recombinant protein allowed to assign the five intramolecular disulfide bridges as well as the dimerization Cys202, thereby confirming the conservation of the disulfide pattern previously described for fish STC1. SAXS data also clearly demonstrated that STC1 adopts a dimeric, slightly elongated structure in solution. CONCLUSION Our data reveal the first low resolution, structural information for human STC1. Theoretical predictions and circular dichroism spectroscopy both suggested that STC1 has a high content of alpha-helices and SAXS experiments revealed that STC1 is a dimer of slightly elongated shape in solution. The dimerization was confirmed by mass spectrometry as was the highly conserved disulfide pattern, which is identical to that found in fish STC1.
Collapse
Affiliation(s)
- Daniel M Trindade
- Centro de Biologia Molecular Estrutural (CEBIME), Campinas, SP, Brazil
- Instituto de Biologia, Departamento de Bioquímica, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Júlio C Silva
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, SP, Brazil
- Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, SP, Brazil
| | | | - Iris CL Torriani
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, SP, Brazil
- Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, SP, Brazil
| | - Jörg Kobarg
- Centro de Biologia Molecular Estrutural (CEBIME), Campinas, SP, Brazil
- Instituto de Biologia, Departamento de Bioquímica, Universidade Estadual de Campinas, Campinas, SP, Brazil
| |
Collapse
|
12
|
Bressan GC, Quaresma AJC, Moraes EC, Manfiolli AO, Passos DO, Gomes MD, Kobarg J. Functional association of human Ki-1/57 with pre-mRNA splicing events. FEBS J 2009; 276:3770-83. [PMID: 19523114 DOI: 10.1111/j.1742-4658.2009.07092.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The cytoplasmic and nuclear protein Ki-1/57 was first identified in malignant cells from Hodgkin's lymphoma. Despite studies showing its phosphorylation, arginine methylation, and interaction with several regulatory proteins, the functional role of Ki-1/57 in human cells remains to be determined. Here, we investigated the relationship of Ki-1/57 with RNA functions. Through immunoprecipitation assays, we verified the association of Ki-1/57 with the endogenous splicing proteins hnRNPQ and SFRS9 in HeLa cell extracts. We also found that recombinant Ki-1/57 was able to bind to a poly-U RNA probe in electrophoretic mobility shift assays. In a classic splicing test, we showed that Ki-1/57 can modify the splicing site selection of the adenoviral E1A minigene in a dose-dependent manner. Further confocal and fluorescence microscopy analysis revealed the localization of enhanced green fluorescent proteinKi-1/57 to nuclear bodies involved in RNA processing and or small nuclear ribonucleoprotein assembly, depending on the cellular methylation status and its N-terminal region. In summary, our findings suggest that Ki-1/57 is probably involved in cellular events related to RNA functions, such as pre-mRNA splicing.
Collapse
|
13
|
Lanza DCF, Silva JC, Assmann EM, Quaresma AJC, Bressan GC, Torriani IL, Kobarg J. Human FEZ1 has characteristics of a natively unfolded protein and dimerizes in solution. Proteins 2009; 74:104-21. [PMID: 18615714 DOI: 10.1002/prot.22135] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The fasciculation and elongation protein Zeta 1 (FEZ1) is the mammalian orthologue of the Caenorhabditis elegans protein UNC-76, which is necessary for axon growth. Human FEZ1 interacts with Protein Kinase C (PKC) and several regulatory proteins involved in functions ranging from microtubule associated transport to transcriptional regulation. Theoretical prediction, circular dichroism, fluorescence spectroscopy, and limited proteolysis of recombinant FEZ1 suggest that it contains disordered regions, especially in its N-terminal region, and that it may belong to the group of natively unfolded proteins. Small angle X-ray scattering experiments indicated a mainly disordered conformation, proved that FEZ1 is a dimer of elongated shape and provided overall dimensional parameters for the protein. In vitro pull down experiments confirmed these results and demonstrated that dimerization involves the N-terminus. Ab-initio 3D low resolution models of the full-length conformation of the dimeric constructs 6xHis-FEZ1(1-392) and 6xHis-FEZ1(1-227) were obtained. Furthermore, we performed in vitro phosphorylation assays of FEZ1 with PKC. The phosphorylation occurred mainly in its C-terminal region, and does not cause any significant conformational changes, but nonetheless inhibited its interaction with the FEZ1 interacting domain of the protein CLASP2 in vitro. The C terminus of FEZ1 has been reported to bind to several interacting proteins. This suggests that FEZ1 binding and transport function of interacting proteins may be subject to regulation by phosphorylation.
Collapse
|