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Kikuchi K, Sakamoto Y, Uezu A, Yamamoto H, Ishiguro KI, Shimamura K, Saito T, Hisanaga SI, Nakanishi H. Map7D2 and Map7D1 facilitate microtubule stabilization through distinct mechanisms in neuronal cells. Life Sci Alliance 2022; 5:5/8/e202201390. [PMID: 35470240 PMCID: PMC9039348 DOI: 10.26508/lsa.202201390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/01/2022] [Accepted: 04/01/2022] [Indexed: 12/05/2022] Open
Abstract
The microtubule-associated proteins Map7D2 and Map7D1, which belong to the MAP7 family, stabilize microtubules through distinct mechanisms for the control of cell motility and neurite outgrowth. Microtubule (MT) dynamics are modulated through the coordinated action of various MT-associated proteins (MAPs). However, the regulatory mechanisms underlying MT dynamics remain unclear. We show that the MAP7 family protein Map7D2 stabilizes MTs to control cell motility and neurite outgrowth. Map7D2 directly bound to MTs through its N-terminal half and stabilized MTs in vitro. Map7D2 localized prominently to the centrosome and partially on MTs in mouse N1-E115 neuronal cells, which expresses two of the four MAP7 family members, Map7D2 and Map7D1. Map7D2 loss decreased the resistance to the MT-destabilizing agent nocodazole without affecting acetylated/detyrosinated stable MTs, suggesting that Map7D2 stabilizes MTs via direct binding. In addition, Map7D2 loss increased the rate of random cell migration and neurite outgrowth, presumably by disturbing the balance between MT stabilization and destabilization. Map7D1 exhibited similar subcellular localization and gene knockdown phenotypes to Map7D2. However, in contrast to Map7D2, Map7D1 was required for the maintenance of acetylated stable MTs. Taken together, our data suggest that Map7D2 and Map7D1 facilitate MT stabilization through distinct mechanisms in cell motility and neurite outgrowth.
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Affiliation(s)
- Koji Kikuchi
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yasuhisa Sakamoto
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Akiyoshi Uezu
- Department of Cell Biology, Duke University Medical School, Durham, NC, USA
| | - Hideyuki Yamamoto
- Department of Biochemistry, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Kei-Ichiro Ishiguro
- Department of Chromosome Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, Japan
| | - Kenji Shimamura
- Department of Brain Morphogenesis, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, Japan
| | - Taro Saito
- Department of Biological Sciences, Tokyo Metropolitan University, Hachioji, Japan
| | - Shin-Ichi Hisanaga
- Department of Biological Sciences, Tokyo Metropolitan University, Hachioji, Japan
| | - Hiroyuki Nakanishi
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
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2
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Roncato F, Regev O, Yadav SK, Alon R. Microtubule destabilization is a critical checkpoint of chemotaxis and transendothelial migration in melanoma cells but not in T cells. Cell Adh Migr 2021; 15:166-179. [PMID: 34152257 PMCID: PMC8218694 DOI: 10.1080/19336918.2021.1934958] [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: 11/16/2022] Open
Abstract
Microtubules (MTs) control cell shape and intracellular cargo transport. The role of MT turnover in the migration of slow-moving cells through endothelial barriers remains unclear. To irreversibly interfere with MT disassembly, we have used the MT-stabilizing agent zampanolide (ZMP) in Β16F10 melanoma as amodel of slow-moving cells. ZMP-treated B16 cells failed to follow chemotactic gradients across rigid confinements and could not generate stable sub-endothelial pseudopodia under endothelial monolayers. In vivo, ZMP-treated Β16 cells failed to extravasate though lung capillaries. In contrast to melanoma cells, the chemotaxis and transendothelial migration of ZMP-treated Tcells were largely conserved. This is afirst demonstration that MT disassembly is akey checkpoint in the directional migration of cancer cells but not of lymphocytes.
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Affiliation(s)
- Francesco Roncato
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | - Ofer Regev
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
| | | | - Ronen Alon
- Department of Immunology, Weizmann Institute of Science, Rehovot, Israel
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3
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Kikuchi K, Nakamura A, Arata M, Shi D, Nakagawa M, Tanaka T, Uemura T, Fujimori T, Kikuchi A, Uezu A, Sakamoto Y, Nakanishi H. Map7/7D1 and Dvl form a feedback loop that facilitates microtubule remodeling and Wnt5a signaling. EMBO Rep 2018; 19:embr.201745471. [PMID: 29880710 DOI: 10.15252/embr.201745471] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 04/28/2018] [Accepted: 05/08/2018] [Indexed: 11/09/2022] Open
Abstract
The Wnt signaling pathway can be grouped into two classes, the β-catenin-dependent and β-catenin-independent pathways. Wnt5a signaling through a β-catenin-independent pathway promotes microtubule (MT) remodeling during cell-substrate adhesion, cell migration, and planar cell polarity formation. Although Wnt5a signaling and MT remodeling are known to form an interdependent regulatory loop, the underlying mechanism remains unknown. Here we show that in HeLa cells, the paralogous MT-associated proteins Map7 and Map7D1 (Map7/7D1) form an interdependent regulatory loop with Disheveled, the critical signal transducer in Wnt signaling. Map7/7D1 bind to Disheveled, direct its cortical localization, and facilitate the cortical targeting of MT plus-ends in response to Wnt5a signaling. Wnt5a signaling also promotes Map7/7D1 movement toward MT plus-ends, and depletion of the Kinesin-1 member Kif5b abolishes the Map7/7D1 dynamics and Disheveled localization. Furthermore, Disheveled stabilizes Map7/7D1. Intriguingly, Map7/7D1 and its Drosophila ortholog, Ensconsin show planar-polarized distribution in both mouse and fly epithelia, and Ensconsin influences proper localization of Drosophila Disheveled in pupal wing cells. These results suggest that the role of Map7/7D1/Ensconsin in Disheveled localization is evolutionarily conserved.
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Affiliation(s)
- Koji Kikuchi
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Chuo-ku Kumamoto, Japan
| | - Akira Nakamura
- Department of Germline Development, Institute of Molecular Embryology and Genetics, Kumamoto University, Chuo-ku Kumamoto, Japan.,Graduate School of Pharmaceutical Sciences, Kumamoto University, Chuo-ku Kumamoto, Japan
| | - Masaki Arata
- Graduate School of Biostudies, Kyoto University, Sakyo-ku Kyoto, Japan
| | - Dongbo Shi
- Division of Embryology, National Institute for Basic Biology, Okazaki Aichi, Japan
| | - Mami Nakagawa
- Division of Embryology, National Institute for Basic Biology, Okazaki Aichi, Japan
| | - Tsubasa Tanaka
- Department of Germline Development, Institute of Molecular Embryology and Genetics, Kumamoto University, Chuo-ku Kumamoto, Japan.,Graduate School of Pharmaceutical Sciences, Kumamoto University, Chuo-ku Kumamoto, Japan
| | - Tadashi Uemura
- Graduate School of Biostudies, Kyoto University, Sakyo-ku Kyoto, Japan
| | - Toshihiko Fujimori
- Division of Embryology, National Institute for Basic Biology, Okazaki Aichi, Japan
| | - Akira Kikuchi
- Department of Molecular Biology and Biochemistry, Graduate School of Medicine, Osaka University, Suita Osaka, Japan
| | - Akiyoshi Uezu
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Chuo-ku Kumamoto, Japan
| | - Yasuhisa Sakamoto
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Chuo-ku Kumamoto, Japan
| | - Hiroyuki Nakanishi
- Department of Molecular Pharmacology, Graduate School of Medical Sciences, Kumamoto University, Chuo-ku Kumamoto, Japan
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4
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Chudinova EM, Nadezhdina ES. Interactions between the Translation Machinery and Microtubules. BIOCHEMISTRY (MOSCOW) 2018; 83:S176-S189. [PMID: 29544439 DOI: 10.1134/s0006297918140146] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Microtubules are components of eukaryotic cytoskeleton that are involved in the transport of various components from the nucleus to the cell periphery and back. They also act as a platform for assembly of complex molecular ensembles. Ribonucleoprotein (RNP) complexes, such as ribosomes and mRNPs, are transported over significant distances (e.g. to neuronal processes) along microtubules. The association of RNPs with microtubules and their transport along these structures are essential for compartmentalization of protein biosynthesis in cells. Microtubules greatly facilitate assembly of stress RNP granules formed by accumulation of translation machinery components during cell stress response. Microtubules are necessary for the cytoplasm-to-nucleus transport of proteins, including ribosomal proteins. At the same time, ribosomal proteins and RNA-binding proteins can influence cell mobility and cytoplasm organization by regulating microtubule dynamics. The molecular mechanisms underlying the association between the translation machinery components and microtubules have not been studied systematically; the results of such studies are mostly fragmentary. In this review, we attempt to fill this gap by summarizing and discussing the data on protein and RNA components of the translation machinery that directly interact with microtubules or microtubule motor proteins.
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Affiliation(s)
- E M Chudinova
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia.
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5
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Daple Coordinates Planar Polarized Microtubule Dynamics in Ependymal Cells and Contributes to Hydrocephalus. Cell Rep 2017; 20:960-972. [DOI: 10.1016/j.celrep.2017.06.089] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 05/22/2017] [Accepted: 06/29/2017] [Indexed: 11/15/2022] Open
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Cui J, Jin G, Yu B, Wang Z, Lin R, Huang JD. Stable knockdown of Kif5b in MDCK cells leads to epithelial-mesenchymal transition. Biochem Biophys Res Commun 2015; 463:123-9. [PMID: 26002460 DOI: 10.1016/j.bbrc.2015.05.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 05/09/2015] [Indexed: 12/20/2022]
Abstract
Polarization of epithelial cells requires vectorial sorting and transport of polarity proteins to apical or basolateral domains. Kif5b is the mouse homologue of the human ubiquitous Kinesin Heavy Chain (uKHC). To investigate the function of Kif5b in epithelial cells, we examined the phenotypes of Kif5b-deficient MDCK cells. Stable knockdown of Kif5b in MDCK cells resulted in reduced cell proliferation rate, profound changes in cell morphology, loss of epithelial cell marker, and gain of mesenchymal marker, as well as increased cell migration, invasion, and tumorigenesis abilities. E-cadherin and NMMIIA could interact with Kif5b in polarized MDCK cells, and their expression levels were decreased in Kif5b-deficient MDCK cells. Overexpression of E-cadherin and NMMIIA in Kif5b depleted MDCK cells could decrease mesenchymal marker expression and cell migration ability. These results indicate that stable knockdown of Kif5b in MDCK cells can lead to epithelial-mesenchymal transition, which is mediated by defective E-cadherin and NMMIIA expression.
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Affiliation(s)
- Ju Cui
- The Key Laboratory of Geriatrics, Beijing Hospital & Beijing Institute of Geriatrics, Ministry of Health, Beijing, China; Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
| | - Guoxiang Jin
- Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - Bin Yu
- Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - Zai Wang
- Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; Institute of Clinical Medical Sciences, China-Japan Friendship Hospital, Beijing, China
| | - Raozhou Lin
- Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China
| | - Jian-Dong Huang
- Department of Biochemistry, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China; The Centre for Synthetic Biology Engineering Research, Shenzhen Institutes of Advanced Technology, Shenzhen, China.
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7
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Arnaiz O, Cohen J, Tassin AM, Koll F. Remodeling Cildb, a popular database for cilia and links for ciliopathies. Cilia 2014; 3:9. [PMID: 25422781 PMCID: PMC4242763 DOI: 10.1186/2046-2530-3-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 10/30/2014] [Indexed: 12/12/2022] Open
Abstract
Background New generation technologies in cell and molecular biology generate large amounts
of data hard to exploit for individual proteins. This is particularly true for
ciliary and centrosomal research. Cildb is a multi–species knowledgebase
gathering high throughput studies, which allows advanced searches to identify
proteins involved in centrosome, basal body or cilia biogenesis, composition and
function. Combined to localization of genetic diseases on human chromosomes given
by OMIM links, candidate ciliopathy proteins can be compiled through Cildb
searches. Methods Othology between recent versions of the whole proteomes was computed using
Inparanoid and ciliary high throughput studies were remapped on these recent
versions. Results Due to constant evolution of the ciliary and centrosomal field, Cildb has been
recently upgraded twice, with new species whole proteomes and new ciliary studies,
and the latter version displays a novel BioMart interface, much more intuitive
than the previous ones. Conclusions This already popular database is designed now for easier use and is up to date in
regard to high throughput ciliary studies.
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Affiliation(s)
- Olivier Arnaiz
- Centre de Génétique Moléculaire, CNRS, Avenue de la Terrasse, Gif sur Yvette, 91198, France
| | - Jean Cohen
- Centre de Génétique Moléculaire, CNRS, Avenue de la Terrasse, Gif sur Yvette, 91198, France
| | - Anne-Marie Tassin
- Centre de Génétique Moléculaire, CNRS, Avenue de la Terrasse, Gif sur Yvette, 91198, France
| | - France Koll
- Centre de Génétique Moléculaire, CNRS, Avenue de la Terrasse, Gif sur Yvette, 91198, France
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Ageta-Ishihara N, Miyata T, Ohshima C, Watanabe M, Sato Y, Hamamura Y, Higashiyama T, Mazitschek R, Bito H, Kinoshita M. Septins promote dendrite and axon development by negatively regulating microtubule stability via HDAC6-mediated deacetylation. Nat Commun 2014; 4:2532. [PMID: 24113571 PMCID: PMC3826633 DOI: 10.1038/ncomms3532] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 09/02/2013] [Indexed: 11/11/2022] Open
Abstract
Neurite growth requires two guanine nucleotide-binding protein polymers of tubulins and septins. However, whether and how those cytoskeletal systems are coordinated was unknown. Here we show that the acute knockdown or knockout of the pivotal septin subunit SEPT7 from cerebrocortical neurons impairs their interhemispheric and cerebrospinal axon projections and dendritogenesis in perinatal mice, when the microtubules are severely hyperacetylated. The resulting hyperstabilization and growth retardation of microtubules are demonstrated in vitro. The phenotypic similarity between SEPT7 depletion and the pharmacological inhibition of α-tubulin deacetylase HDAC6 reveals that HDAC6 requires SEPT7 not for its enzymatic activity, but to associate with acetylated α-tubulin. These and other findings indicate that septins provide a physical scaffold for HDAC6 to achieve efficient microtubule deacetylation, thereby negatively regulating microtubule stability to an optimal level for neuritogenesis. Our findings shed light on the mechanisms underlying the HDAC6-mediated coupling of the two ubiquitous cytoskeletal systems during neural development. Septins are a family of heteropolymerizing GTP/GDP-binding proteins and are implicated in neuritogenesis in nematodes. Ageta-Ishihara et al. show that septins also facilitate this process in the developing mouse brain as scaffolds that coordinate HDAC6-mediated deacetylation of microtubules.
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Affiliation(s)
- Natsumi Ageta-Ishihara
- Division of Biological Sciences, Nagoya University Graduate School of Science, Nagoya 464-8602, Japan
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9
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Fang G, Zhang D, Yin H, Zheng L, Bi X, Yuan L. Centlein mediates an interaction between C-Nap1 and Cep68 to maintain centrosome cohesion. J Cell Sci 2014; 127:1631-9. [PMID: 24554434 DOI: 10.1242/jcs.139451] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Centrosome cohesion, mostly regarded as a proteinaceous linker between parental centrioles, ensures that the interphase centrosome(s) function as a single microtubule-organizing center. Impairment of centrosome cohesion leads to the splitting of centrosomes. Although the list of cohesion proteins is growing, the precise composition and regulation of centrosome cohesion are still largely unknown. In this study, we show that the centriolar protein centlein (also known as CNTLN) localizes to the proximal ends of the centrioles and directly interacts with both C-Nap1 (also known as Cep250) and Cep68. Moreover, centlein complexes with C-Nap1 and Cep68 at the proximal ends of centrioles during interphase and functions as a molecular link between C-Nap1 and Cep68. Depletion of centlein impairs recruitment of Cep68 to the centrosomes and, in turn, results in centrosome splitting. Both centlein and Cep68 are novel Nek2A substrates. Collectively, our data demonstrate that centrosome cohesion is maintained by the newly identified complex of C-Nap1-centlein-Cep68.
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Affiliation(s)
- Guoliang Fang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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10
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Dash SN, Lehtonen E, Wasik AA, Schepis A, Paavola J, Panula P, Nelson WJ, Lehtonen S. Sept7b is essential for pronephric function and development of left-right asymmetry in zebrafish embryogenesis. J Cell Sci 2014; 127:1476-86. [PMID: 24496452 DOI: 10.1242/jcs.138495] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The conserved septin family of filamentous small GTPases plays important roles in mitosis, cell migration and cell morphogenesis by forming scaffolds and diffusion barriers. Recent studies in cultured cells in vitro indicate that a septin complex of septin 2, 7 and 9 is required for ciliogenesis and cilia function, but septin function in ciliogenesis in vertebrate organs in vivo is not understood. We show that sept7b is expressed in ciliated cells in different tissues during early zebrafish development. Knockdown of sept7b by using morpholino antisense oligonucleotides caused misorientation of basal bodies and cilia, reduction of apical actin and the shortening of motile cilia in Kupffer's vesicle and pronephric tubules. This resulted in pericardial and yolk sac edema, body axis curvature and hydrocephaly. Notably, in sept7b morphants we detected strong left-right asymmetry defects in the heart and lateral plate mesoderm (situs inversus), reduced fluid flow in the kidney, the formation of kidney cysts and loss of glomerular filtration barrier function. Thus, sept7b is essential during zebrafish development for pronephric function and ciliogenesis, and loss of expression of sept7b results in defects that resemble human ciliopathies.
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Affiliation(s)
- Surjya Narayan Dash
- University of Helsinki, Haartman Institute, Department of Pathology, Haartmaninkatu 3, 00290 Helsinki, Finland
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11
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The microtubule-associated C-I subfamily of TRIM proteins and the regulation of polarized cell responses. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 770:105-18. [PMID: 23631003 DOI: 10.1007/978-1-4614-5398-7_8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
TRIM proteins are multidomain proteins that typically assemble into large molecular complexes, the composition of which likely explains the diverse functions that have been attributed to this group of proteins. Accumulating data on the roles of many TRIM proteins supports the notion that those that share identical C-terminal domain architectures participate in the regulation of similar cellular processes. At least nine different C-terminal domain compositions have been identified. This chapter will focus on one subgroup that possess a COS motif, FNIII and SPRY/B30.2 domain as their C-terminal domain arrangement. This C-terminal domain architecture plays a key role in the interaction of all six members of this subgroup with the microtubule cytoskeleton. Accumulating evidence on the functions of some of these proteins will be discussed to highlight the emerging similarities in the cellular events in which they participate.
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12
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Isolation, identification, and validation of microtubule-associated proteins from Drosophila embryos. Methods Mol Biol 2011; 777:273-91. [PMID: 21773936 DOI: 10.1007/978-1-61779-252-6_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Abstract
The microtubule (MT) cytoskeleton is required for many aspects of cell function, including the transport of intracellular materials, maintenance of cell polarity, and the regulation of mitosis. These functions are coordinated by MT-associated proteins (MAPs), which work in concert with each other, binding MTs and altering their properties. We have used an MT co-sedimentation assay, combined with 1D and 2D PAGE and mass spectrometry, to isolate MAPs from early Drosophila embryos. This technique has identified many novel proteins and an association with MTs for many known proteins, previously not described as associating with MTs.
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13
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Fisher KH, Deane CM, Wakefield JG. The functional domain grouping of microtubule associated proteins. Commun Integr Biol 2011; 1:47-50. [PMID: 19704789 DOI: 10.4161/cib.1.1.6795] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Accepted: 08/12/2008] [Indexed: 11/19/2022] Open
Abstract
Microtubules (MTs), which play crucial roles in normal cell function, are regulated by MT associated proteins (MAPs). Using a combinatorial approach that includes biochemistry, proteomics and bioinformatics, we have recently identified 270 putative MAPs from Drosophila embryos and characterized some of those required for correct progression through mitosis. Here we identify functional groups of these MAPs using a reciprocal hits sequence alignment technique and assign InterPro functional domains to 28 previously uncharacterized proteins. This approach gives insight into the potential functions of MAPs and how their roles may affect MTs.
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14
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Spiliotis ET. Regulation of microtubule organization and functions by septin GTPases. Cytoskeleton (Hoboken) 2010; 67:339-45. [PMID: 20517923 DOI: 10.1002/cm.20448] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Septins comprise an evolutionarily conserved family of oligomeric GTPases that regulate the intracellular localization of proteins by functioning as protein scaffolds and diffusion barriers. Recent studies reveal that septins associate with microtubules, microtubule-associated proteins (MAPs), and microtubule motors. Here, I review these findings and consider how septins may spatially regulate the interaction of microtubules with MAPs and motor proteins. Thus, septins may constitute a novel regulatory module of microtubule organization and function with important implications in the understanding and treatment of cancer and neurodegeneration.
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Affiliation(s)
- Elias T Spiliotis
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, USA.
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15
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Abu-Helo A, Simonin F. Identification and biological significance of G protein-coupled receptor associated sorting proteins (GASPs). Pharmacol Ther 2010; 126:244-50. [PMID: 20394773 DOI: 10.1016/j.pharmthera.2010.03.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Accepted: 03/23/2010] [Indexed: 12/25/2022]
Abstract
G protein-coupled receptors (GPCRs) represent one of the most abundant protein families encoded by the human genome. They are involved in the modulation of numerous physiological functions and represent major drug targets. Their activity is tightly controlled by a vast array of interacting partners that modulate their membrane targeting, intracellular trafficking and signalling properties. Among them, several proteins from the same family, G protein-coupled receptor associated sorting proteins (GASP), have been shown to display a broad spectrum of interactions with GPCRs. In addition to their postulated role in the modulation of the post-endocytic sorting of these receptors, recent data indicate that several GASPs may modulate the transcriptional activity of the cell through their interaction with transcription factors. However, no clear molecular function has been assigned yet to this protein family. In this review, we describe the discovery of GASPs, their major features, interacting partners, functions and possible involvement in pathological situations including neurodegenerative diseases and cancer.
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Affiliation(s)
- Alaa Abu-Helo
- Institut de Recherche de l'ESBS, CNRS - Université de Strasbourg, FRE3211, Bld Sébastien Brant, 67412 Illkirch, France
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16
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Jiang W, Duysen EG, Hansen H, Shlyakhtenko L, Schopfer LM, Lockridge O. Mice treated with chlorpyrifos or chlorpyrifos oxon have organophosphorylated tubulin in the brain and disrupted microtubule structures, suggesting a role for tubulin in neurotoxicity associated with exposure to organophosphorus agents. Toxicol Sci 2010; 115:183-93. [PMID: 20142434 DOI: 10.1093/toxsci/kfq032] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Exposure to organophosphorus (OP) agents can lead to learning and memory deficits. Disruption of axonal transport has been proposed as a possible explanation. Microtubules are an essential component of axonal transport. In vitro studies have demonstrated that OP agents react with tubulin and disrupt the structure of microtubules. Our goal was to determine whether in vivo exposure affects microtubule structure. One group of mice was treated daily for 14 days with a dose of chlorpyrifos that did not significantly inhibit acetylcholinesterase. Beta-tubulin from the brains of these mice was diethoxyphosphorylated on tyrosine 281 in peptide GSQQY(281)RALTVPELTQQMFDSK. A second group of mice was treated with a single sublethal dose of chlorpyrifos oxon (CPO). Microtubules and cosedimenting proteins from the brains of these mice were visualized by atomic force microscopy nanoimaging and by Coomassie blue staining of polyacrylamide gel electrophoresis bands. Proteins in gel slices were identified by mass spectrometry. Nanoimaging showed that microtubules from control mice were decorated with many proteins, whereas microtubules from CPO-treated mice had fewer associated proteins, a result confirmed by mass spectrometry of proteins extracted from gel slices. The dimensions of microtubules from CPO-treated mice (height 8.7 +/- 3.1 nm and width 36.5 +/- 15.5 nm) were about 60% of those from control mice (height 13.6 +/- 3.6 nm and width 64.8 +/- 15.9 nm). A third group of mice was treated with six sublethal doses of CPO over 50.15 h. Mass spectrometry identified diethoxyphosphorylated serine 338 in peptide NS(338)NFVEWIPNNVK of beta-tubulin. In conclusion, microtubules from mice exposed to chlorpyrifos or to CPO have covalently modified amino acids and abnormal structure, suggesting disruption of microtubule function. Covalent binding of CPO to tubulin and to tubulin-associated proteins is a potential mechanism of neurotoxicity.
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Affiliation(s)
- Wei Jiang
- Eppley Institute, University of Nebraska Medical Center, Omaha, Nebraska 68198-5950, USA
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Schulz I, Erle A, Gräf R, Krüger A, Lohmeier H, Putzler S, Samereier M, Weidenthaler S. Identification and cell cycle-dependent localization of nine novel, genuine centrosomal components inDictyostelium discoideum. ACTA ACUST UNITED AC 2009; 66:915-28. [DOI: 10.1002/cm.20384] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Patel PC, Fisher KH, Yang ECC, Deane CM, Harrison RE. Proteomic analysis of microtubule-associated proteins during macrophage activation. Mol Cell Proteomics 2009; 8:2500-14. [PMID: 19651621 DOI: 10.1074/mcp.m900190-mcp200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Classical activation of macrophages induces a wide range of signaling and vesicle trafficking events to produce a more aggressive cellular phenotype. The microtubule (MT) cytoskeleton is crucial for the regulation of immune responses. In the current study, we used a large scale proteomics approach to analyze the change in protein composition of the MT-associated protein (MAP) network by macrophage stimulation with the inflammatory cytokine interferon-gamma and the endotoxin lipopolysaccharide. Overall the analysis identified 409 proteins that bound directly or indirectly to MTs. Of these, 52 were up-regulated 2-fold or greater and 42 were down-regulated 2-fold or greater after interferon-gamma/lipopolysaccharide stimulation. Bioinformatics analysis based on publicly available binary protein interaction data produced a putative interaction network of MAPs in activated macrophages. We confirmed the up-regulation of several MAPs by immunoblotting and immunofluorescence analysis. More detailed analysis of one up-regulated protein revealed a role for HSP90beta in stabilization of the MT cytoskeleton during macrophage activation.
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Affiliation(s)
- Prerna C Patel
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario M1C 1A4, Canada
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Abstract
Ion exchange chromatography is a fractionation technique applicable to the separation of brain-derived proteins based on charge. Proteome complexity overwhelms analytical approaches, which is mitigated by fractioning samples into simpler solutions. In this chapter we will cover the design, optimization, and execution of an ion exchange experiment for the separation of a brain lysate. Furthermore, helpful tips and pitfall will be revealed to aid with potential problems that may arise. The discussed proteomic methodology is applicable to multidimensional separations ahead of bottom-up or top-down proteomic strategies for characterizing the neuroproteome.
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Affiliation(s)
- Brian F Fuller
- Department of Anatomy, Virginia Commonwealth University, Richmond, VA, USA
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