1
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Barrero DJ, Wijeratne SS, Zhao X, Cunningham GF, Yan R, Nelson CR, Arimura Y, Funabiki H, Asbury CL, Yu Z, Subramanian R, Biggins S. Architecture of native kinetochores revealed by structural studies utilizing a thermophilic yeast. Curr Biol 2024; 34:3881-3893.e5. [PMID: 39127048 PMCID: PMC11387133 DOI: 10.1016/j.cub.2024.07.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 05/30/2024] [Accepted: 07/08/2024] [Indexed: 08/12/2024]
Abstract
Eukaryotic chromosome segregation requires kinetochores, multi-megadalton protein machines that assemble on the centromeres of chromosomes and mediate attachments to dynamic spindle microtubules. Kinetochores are built from numerous complexes, and there has been progress in structural studies on recombinant subassemblies. However, there is limited structural information on native kinetochore architecture. To address this, we purified functional, native kinetochores from the thermophilic yeast Kluyveromyces marxianus and examined them by electron microscopy (EM), cryoelectron tomography (cryo-ET), and atomic force microscopy (AFM). The kinetochores are extremely large, flexible assemblies that exhibit features consistent with prior models. We assigned kinetochore polarity by visualizing their interactions with microtubules and locating the microtubule binder, Ndc80c. This work shows that isolated kinetochores are more dynamic and complex than what might be anticipated based on the known structures of recombinant subassemblies and provides the foundation to study the global architecture and functions of kinetochores at a structural level.
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Affiliation(s)
- Daniel J Barrero
- Howard Hughes Medical Institute, Division of Basic Sciences, Fred Hutchinson Cancer Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA; Molecular and Cellular Biology Program, University of Washington, 1705 NE Pacific Street, Seattle, WA 98195, USA
| | - Sithara S Wijeratne
- Department of Molecular Biology, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA; Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA
| | - Xiaowei Zhao
- Howard Hughes Medical Institute Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA
| | - Grace F Cunningham
- Department of Molecular Biology, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA; Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA
| | - Rui Yan
- Howard Hughes Medical Institute Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA
| | - Christian R Nelson
- Howard Hughes Medical Institute, Division of Basic Sciences, Fred Hutchinson Cancer Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA
| | - Yasuhiro Arimura
- The Rockefeller University, 1230 York Ave., New York, NY 10065, USA
| | | | - Charles L Asbury
- Department of Physiology and Biophysics, University of Washington, 1959 NE Pacific Street, Seattle, WA 98195, USA
| | - Zhiheng Yu
- Howard Hughes Medical Institute Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA
| | - Radhika Subramanian
- Department of Molecular Biology, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA; Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA
| | - Sue Biggins
- Howard Hughes Medical Institute, Division of Basic Sciences, Fred Hutchinson Cancer Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA.
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2
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Pan B, Bruno M, Macfarlan TS, Akera T. Meiosis-specific decoupling of the pericentromere from the kinetochore. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.21.604490. [PMID: 39091844 PMCID: PMC11291024 DOI: 10.1101/2024.07.21.604490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
The primary constriction site of the M-phase chromosome is an established marker for the kinetochore position, often used to determine the karyotype of each species. Underlying this observation is the concept that the kinetochore is spatially linked with the pericentromere where sister-chromatids are most tightly cohered. Here, we found an unconventional pericentromere specification with sister chromatids mainly cohered at a chromosome end, spatially separated from the kinetochore in Peromyscus mouse oocytes. This distal locus enriched cohesin protectors, such as the Chromosomal Passenger Complex (CPC) and PP2A, at a higher level compared to its centromere/kinetochore region, acting as the primary site for sister-chromatid cohesion. Chromosomes with the distal cohesion site exhibited enhanced cohesin protection at anaphase I compared to those without it, implying that these distal cohesion sites may have evolved to ensure sister-chromatid cohesion during meiosis. In contrast, mitotic cells enriched CPC only near the kinetochore and the distal locus was not cohered between sister chromatids, suggesting a meiosis-specific mechanism to protect cohesin at this distal locus. We found that this distal locus corresponds to an additional centromeric satellite block, located far apart from the centromeric satellite block that builds the kinetochore. Several Peromyscus species carry chromosomes with two such centromeric satellite blocks. Analyses on three Peromyscus species revealed that the internal satellite consistently assembles the kinetochore in both mitosis and meiosis, whereas the distal satellite selectively enriches cohesin protectors in meiosis to promote sister-chromatid cohesion at that site. Thus, our study demonstrates that pericentromere specification is remarkably flexible and can control chromosome segregation in a cell-type and context dependent manner.
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Affiliation(s)
- Bo Pan
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health; Bethesda, Maryland 20894, USA
| | - Melania Bruno
- The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health; Bethesda, Maryland 20894, USA
| | - Todd S Macfarlan
- The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health; Bethesda, Maryland 20894, USA
| | - Takashi Akera
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health; Bethesda, Maryland 20894, USA
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3
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Barrero DJ, Wijeratne SS, Zhao X, Cunningham GF, Rui Y, Nelson CR, Yasuhiro A, Funabiki H, Asbury CL, Yu Z, Subramanian R, Biggins S. Architecture and flexibility of native kinetochores revealed by structural studies utilizing a thermophilic yeast. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.28.582571. [PMID: 38464254 PMCID: PMC10925344 DOI: 10.1101/2024.02.28.582571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Eukaryotic chromosome segregation requires kinetochores, multi-megadalton protein machines that assemble on the centromeres of chromosomes and mediate attachments to dynamic spindle microtubules. Kinetochores are built from numerous complexes, and understanding how they are arranged is key to understanding how kinetochores perform their multiple functions. However, an integrated understanding of kinetochore architecture has not yet been established. To address this, we purified functional, native kinetochores from Kluyveromyces marxianus and examined them by electron microscopy, cryo-electron tomography and atomic force microscopy. The kinetochores are extremely large, flexible assemblies that exhibit features consistent with prior models. We assigned kinetochore polarity by visualizing their interactions with microtubules and locating the microtubule binder Ndc80c. This work shows that isolated kinetochores are more dynamic and complex than what might be anticipated based on the known structures of recombinant subassemblies, and provides the foundation to study the global architecture and functions of kinetochores at a structural level.
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Affiliation(s)
- Daniel J. Barrero
- Howard Hughes Medical Institute, Division of Basic Sciences, Fred Hutchinson Cancer Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA
- Molecular and Cellular Biology Program, University of Washington, 1705 NE Pacific Street, Seattle, WA 98195, USA
| | - Sithara S. Wijeratne
- Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
| | - Xiaowei Zhao
- Howard Hughes Medical Institute Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA
| | - Grace F. Cunningham
- Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
| | - Yan Rui
- Howard Hughes Medical Institute Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA
| | - Christian R. Nelson
- Howard Hughes Medical Institute, Division of Basic Sciences, Fred Hutchinson Cancer Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA
| | - Arimura Yasuhiro
- The Rockefeller University, 1230 York Ave., New York, NY 10065, USA
| | | | - Charles L. Asbury
- Department of Physiology and Biophysics, 1959 NE Pacific Street, University of Washington, Seattle, WA 98195, USA
| | - Zhiheng Yu
- Howard Hughes Medical Institute Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA
| | - Radhika Subramanian
- Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
| | - Sue Biggins
- Howard Hughes Medical Institute, Division of Basic Sciences, Fred Hutchinson Cancer Center, 1100 Fairview Ave. N., Seattle, WA 98109, USA
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4
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Tarasovetc EV, Sissoko GB, Mukhina AS, Maiorov A, Ataullakhanov FI, Cheeseman IM, Grishchuk EL. Molecular density-accelerated binding-site maturation underlies CENP-T-dependent kinetochore assembly. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.25.581584. [PMID: 38464265 PMCID: PMC10925139 DOI: 10.1101/2024.02.25.581584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Formation of macromolecular cellular structures relies on recruitment of multiple proteins, requiring the precisely controlled pairwise binding interactions. At human kinetochores, our recent work found that the high molecular density environment enables strong bonding between the Ndc80 complex and its two binding sites at the CENP-T receptor. However, the mechanistic basis for this unusual density-dependent facilitation remains unknown. Here, using quantitative single-molecule approaches, we reveal two distinct mechanisms that drive preferential recruitment of the Ndc80 complex to higher-order structures of CENP-T, as opposed to CENP-T monomers. First, the Ndc80 binding sites within the disordered tail of the CENP-T mature over time, leading to a stronger grip on the Spc24/25 heads of the Ndc80 complexes. Second, the maturation of Ndc80 binding sites is accelerated when CENP-T molecules are clustered in close proximity. The rates of the clustering-induced maturation are remarkably different for two binding sites within CENP-T, correlating with different interfaces formed by the corresponding CENP-T sequences as they wrap around the Spc24/25 heads. The differential clustering-dependent regulation of these sites is preserved in dividing human cells, suggesting a distinct regulatory entry point to control kinetochore-microtubule interactions. The tunable acceleration of slowly maturing binding sites by a high molecular-density environment may represent a fundamental physicochemical mechanism to assist the assembly of mitotic kinetochores and other macromolecular structures.
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Affiliation(s)
- Ekaterina V. Tarasovetc
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania; Philadelphia, PA 19104, USA
| | - Gunter B. Sissoko
- Whitehead Institute for Biomedical Research; Cambridge, MA 02142, USA
- Department of Biology, Massachusetts Institute of Technology; Cambridge, MA 02142, USA
| | - Anna S. Mukhina
- Department of Physics, Lomonosov Moscow State University; Moscow, 119991, Russia
| | - Aleksandr Maiorov
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania; Philadelphia, PA 19104, USA
| | - Fazoil I. Ataullakhanov
- Center for Theoretical Problems of Physicochemical Pharmacology, Russian Academy of Sciences; Moscow, 119991, Russia
- Dmitry Rogachev National Research Center of Pediatric Hematology, Oncology and Immunology; Moscow, 117198, Russia
- Moscow Institute of Physics and Technology; 141701, Dolgoprudny, Russia
| | - Iain M. Cheeseman
- Whitehead Institute for Biomedical Research; Cambridge, MA 02142, USA
- Department of Biology, Massachusetts Institute of Technology; Cambridge, MA 02142, USA
| | - Ekaterina L. Grishchuk
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania; Philadelphia, PA 19104, USA
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5
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Edgerton HD, Mukherjee S, Johansson M, Bachant J, Gardner MK, Clarke DJ. Low tension recruits the yeast Aurora B protein Ipl1 to centromeres in metaphase. J Cell Sci 2023; 136:jcs261416. [PMID: 37519149 PMCID: PMC10445749 DOI: 10.1242/jcs.261416] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Accepted: 07/26/2023] [Indexed: 08/01/2023] Open
Abstract
Accurate genome segregation in mitosis requires that all chromosomes are bioriented on the spindle. Cells monitor biorientation by sensing tension across sister centromeres. Chromosomes that are not bioriented have low centromere tension, which allows Aurora B (yeast Ipl1) to perform error correction that locally loosens kinetochore-microtubule attachments to allow detachment of microtubules and fresh attempts at achieving biorientation. However, it is not known whether low tension recruits Aurora B to centromeres or, alternatively, whether low tension directly activates Aurora B already localized at centromeres. In this work, we experimentally induced low tension in metaphase Saccharomyces cerevisiae yeast cells, then monitored Ipl1 localization. We find low tension recruits Ipl1 to centromeres. Furthermore, low tension-induced Ipl1 recruitment depended on Bub1, which is known to provide a binding site for Ipl1. In contrast, Top2, which can also recruit Ipl1 to centromeres, was not required. Our results demonstrate cells are sensitive to low tension at centromeres and respond by actively recruiting Ip1l for error correction.
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Affiliation(s)
- Heather D. Edgerton
- Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Soumya Mukherjee
- Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Marnie Johansson
- Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Jeff Bachant
- Department of Molecular Cell Systems Biology, University of California, Riverside, Riverside, CA 92521, USA
| | - Melissa K. Gardner
- Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, MN 55455, USA
| | - Duncan J. Clarke
- Department of Genetics, Cell Biology & Development, University of Minnesota, Minneapolis, MN 55455, USA
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6
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Li Q, Ma Y, Chang F, Xu Y, Deng J, Duan J, Jiang W, He Q, Xu L, Zhong L, Shao G, Li L. The deubiquitinating enzyme complex BRISC regulates Aurora B activation via lysine-63-linked ubiquitination in mitosis. Commun Biol 2022; 5:1335. [PMID: 36473924 PMCID: PMC9726926 DOI: 10.1038/s42003-022-04299-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 11/24/2022] [Indexed: 12/12/2022] Open
Abstract
Faithful chromosome segregation requires bi-oriented kinetochore-microtubule attachment on the metaphase spindle. Aurora B kinase, the catalytic core of the chromosome passage complex (CPC), plays a crucial role in this process. Aurora B activation has widely been investigated in the context of protein phosphorylation. Here, we report that Aurora B is ubiquitinated in mitosis through lysine-63 ubiquitin chains (K63-Ub), which is required for its activation. Mutation of Aurora B at its primary K63 ubiquitin site inhibits its activation, reduces its kinase activity, and disrupts the association of Aurora B with other components of CPC, leading to severe mitotic defects and cell apoptosis. Moreover, we identify that BRCC36 isopeptidase complex (BRISC) is the K63-specific deubiquitinating enzyme for Aurora B. BRISC deficiency augments the accumulation of Aurora B K63-Ubs, leading to Aurora B hyperactivation and erroneous chromosome-microtubule attachments. These findings define the role of K63-linked ubiquitination in regulating Aurora B activation and provide a potential site for Aurora B-targeting drug design.
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Affiliation(s)
- Qin Li
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Yanfang Ma
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Fen Chang
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Yongjie Xu
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Jingcheng Deng
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Junyi Duan
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Wei Jiang
- grid.11135.370000 0001 2256 9319Department of Biochemistry and Biophysics, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Qihua He
- grid.11135.370000 0001 2256 9319Center of Medical and Health Analysis, Peking University Health Science Center, 100191 Beijing, China
| | - Luzheng Xu
- grid.11135.370000 0001 2256 9319Center of Medical and Health Analysis, Peking University Health Science Center, 100191 Beijing, China
| | - Lijun Zhong
- grid.11135.370000 0001 2256 9319Center of Medical and Health Analysis, Peking University Health Science Center, 100191 Beijing, China
| | - Genze Shao
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
| | - Li Li
- grid.11135.370000 0001 2256 9319Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, 100191 Beijing, China
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7
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Jamasbi E, Hamelian M, Hossain MA, Varmira K. The cell cycle, cancer development and therapy. Mol Biol Rep 2022; 49:10875-10883. [PMID: 35931874 DOI: 10.1007/s11033-022-07788-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 07/11/2022] [Indexed: 10/16/2022]
Abstract
The process of cell division plays a vital role in cancer progression. Cell proliferation and error-free chromosomes segregation during mitosis are central events in life cycle. Mistakes during cell division generate changes in chromosome content and alter the balances of chromosomes number. Any defects in expression of TIF1 family proteins, SAC proteins network, mitotic checkpoint proteins involved in chromosome mis-segregation and cancer development. Here we discuss the function of organelles deal with the chromosome segregation machinery, proteins and correction mechanisms involved in the accurate chromosome segregation during mitosis.
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Affiliation(s)
- Elaheh Jamasbi
- Research Center of Oils and Fats (RCOF), Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mona Hamelian
- Research Center of Oils and Fats (RCOF), Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammed Akhter Hossain
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Kambiz Varmira
- Research Center of Oils and Fats (RCOF), Kermanshah University of Medical Sciences, Kermanshah, Iran.
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8
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Marsoner T, Yedavalli P, Masnovo C, Fink S, Schmitzer K, Campbell CS. Aurora B activity is promoted by cooperation between discrete localization sites in budding yeast. Mol Biol Cell 2022; 33:ar85. [PMID: 35704464 PMCID: PMC9582632 DOI: 10.1091/mbc.e21-11-0590] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 05/17/2022] [Accepted: 06/09/2022] [Indexed: 02/06/2023] Open
Abstract
Chromosome biorientation is promoted by the four-member chromosomal passenger complex (CPC) through phosphorylation of incorrect kinetochore-microtubule attachments. During chromosome alignment, the CPC localizes to the inner centromere, the inner kinetochore, and spindle microtubules. Here we show that a small domain of the CPC subunit INCENP/Sli15 is required to target the complex to all three of these locations in budding yeast. This domain, the single alpha helix (SAH), is essential for phosphorylation of outer kinetochore substrates, chromosome segregation, and viability. By restoring the CPC to each of its three locations through targeted mutations and fusion constructs, we determined their individual contributions to chromosome biorientation. We find that only the inner centromere localization is sufficient for cell viability on its own. However, when combined, the inner kinetochore and microtubule binding activities are also sufficient to promote accurate chromosome segregation. Furthermore, we find that the two pathways target the CPC to different kinetochore attachment states, as the inner centromere-targeting pathway is primarily responsible for bringing the complex to unattached kinetochores. We have therefore discovered that two parallel localization pathways are each sufficient to promote CPC activity in chromosome biorientation, both depending on the SAH domain of INCENP/Sli15.
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Affiliation(s)
- Theodor Marsoner
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, A-1030 Vienna, Austria
| | - Poornima Yedavalli
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, A-1030 Vienna, Austria
| | - Chiara Masnovo
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, A-1030 Vienna, Austria
| | - Sarah Fink
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, A-1030 Vienna, Austria
| | - Katrin Schmitzer
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, A-1030 Vienna, Austria
| | - Christopher S. Campbell
- Department of Chromosome Biology, Max Perutz Labs, University of Vienna, A-1030 Vienna, Austria
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9
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Sridhar S, Fukagawa T. Kinetochore Architecture Employs Diverse Linker Strategies Across Evolution. Front Cell Dev Biol 2022; 10:862637. [PMID: 35800888 PMCID: PMC9252888 DOI: 10.3389/fcell.2022.862637] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 05/23/2022] [Indexed: 01/09/2023] Open
Abstract
The assembly of a functional kinetochore on centromeric chromatin is necessary to connect chromosomes to the mitotic spindle, ensuring accurate chromosome segregation. This connecting function of the kinetochore presents multiple internal and external structural challenges. A microtubule interacting outer kinetochore and centromeric chromatin interacting inner kinetochore effectively confront forces from the external spindle and centromere, respectively. While internally, special inner kinetochore proteins, defined as "linkers," simultaneously interact with centromeric chromatin and the outer kinetochore to enable association with the mitotic spindle. With the ability to simultaneously interact with outer kinetochore components and centromeric chromatin, linker proteins such as centromere protein (CENP)-C or CENP-T in vertebrates and, additionally CENP-QOkp1-UAme1 in yeasts, also perform the function of force propagation within the kinetochore. Recent efforts have revealed an array of linker pathways strategies to effectively recruit the largely conserved outer kinetochore. In this review, we examine these linkages used to propagate force and recruit the outer kinetochore across evolution. Further, we look at their known regulatory pathways and implications on kinetochore structural diversity and plasticity.
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Affiliation(s)
- Shreyas Sridhar
- Laboratory of Chromosome Biology, Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
| | - Tatsuo Fukagawa
- Laboratory of Chromosome Biology, Graduate School of Frontier Biosciences, Osaka University, Suita, Japan
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10
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McKim KS. Highway to hell-thy meiotic divisions: Chromosome passenger complex functions driven by microtubules: CPC interactions with both the chromosomes and microtubules are important for spindle assembly and function: CPC interactions with both the chromosomes and microtubules are important for spindle assembly and function. Bioessays 2022; 44:e2100202. [PMID: 34821405 PMCID: PMC8688318 DOI: 10.1002/bies.202100202] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 10/26/2021] [Accepted: 10/27/2021] [Indexed: 01/03/2023]
Abstract
The chromosome passenger complex (CPC) localizes to chromosomes and microtubules, sometimes simultaneously. The CPC also has multiple domains for interacting with chromatin and microtubules. Interactions between the CPC and both the chromatin and microtubules is important for spindle assembly and error correction. Such dual chromatin-microtubule interactions may increase the concentration of the CPC necessary for efficient kinase activity while also making it responsive to specific conditions or structures in the cell. CPC-microtubule dependent functions are considered in the context of the first meiotic division. Acentrosomal spindle assembly is a process that depends on transfer of the CPC from the chromosomes to the microtubules. Furthermore, transfer to the microtubules is not only to position the CPC for a later role in cytokinesis; metaphase I error correction and subsequent bi-orientation of bivalents may depend on microtubule associated CPC interacting with the kinetochores.
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Affiliation(s)
- Kim S McKim
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, New Jersey, USA
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11
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The Aurora B gradient sustains kinetochore stability in anaphase. Cell Rep 2021; 37:109818. [PMID: 34758321 PMCID: PMC8595645 DOI: 10.1016/j.celrep.2021.109818] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 08/20/2021] [Accepted: 09/17/2021] [Indexed: 12/02/2022] Open
Abstract
Kinetochores assemble on chromosomes in mitosis to allow microtubules to attach and bring about accurate chromosome segregation. The kinases Cyclin B-Cdk1 and Aurora B are crucial for the formation of stable kinetochores. However, the activity of these two kinases appears to decline dramatically at centromeres during anaphase onset, precisely when microtubule attachments are required to move chromosomes toward opposite poles of the dividing cell. We find that, although Aurora B leaves centromeres at anaphase, a gradient of Aurora B activity centered on the central spindle is still able to phosphorylate kinetochore substrates such as Dsn1 to modulate kinetochore stability in anaphase and to regulate kinetochore disassembly as cells enter telophase. We provide a model to explain how Aurora B co-operates with Cyclin B-Cdk1 to maintain kinetochore function in anaphase. Central spindle Aurora B targets kinetochore substrates in anaphase Phosphorylation of Dsn1 by Aurora B stabilizes kinetochores in anaphase Dsn1 phosphorylation modulates chromosome movements in anaphase
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12
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Aurora B Tension Sensing Mechanisms in the Kinetochore Ensure Accurate Chromosome Segregation. Int J Mol Sci 2021; 22:ijms22168818. [PMID: 34445523 PMCID: PMC8396173 DOI: 10.3390/ijms22168818] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 08/11/2021] [Accepted: 08/13/2021] [Indexed: 11/29/2022] Open
Abstract
The accurate segregation of chromosomes is essential for the survival of organisms and cells. Mistakes can lead to aneuploidy, tumorigenesis and congenital birth defects. The spindle assembly checkpoint ensures that chromosomes properly align on the spindle, with sister chromatids attached to microtubules from opposite poles. Here, we review how tension is used to identify and selectively destabilize incorrect attachments, and thus serves as a trigger of the spindle assembly checkpoint to ensure fidelity in chromosome segregation. Tension is generated on properly attached chromosomes as sister chromatids are pulled in opposing directions but resisted by centromeric cohesin. We discuss the role of the Aurora B kinase in tension-sensing and explore the current models for translating mechanical force into Aurora B-mediated biochemical signals that regulate correction of chromosome attachments to the spindle.
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Saldivia M, Wollman AJM, Carnielli JBT, Jones NG, Leake MC, Bower-Lepts C, Rao SPS, Mottram JC. A CLK1-KKT2 Signaling Pathway Regulating Kinetochore Assembly in Trypanosoma brucei. mBio 2021; 12:e0068721. [PMID: 34128702 PMCID: PMC8262961 DOI: 10.1128/mbio.00687-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/07/2021] [Indexed: 01/17/2023] Open
Abstract
During mitosis, eukaryotic cells must duplicate and separate their chromosomes in a precise and timely manner. The apparatus responsible for this is the kinetochore, which is a large protein structure that links chromosomal DNA and spindle microtubules to facilitate chromosome alignment and segregation. The proteins that comprise the kinetochore in the protozoan parasite Trypanosoma brucei are divergent from yeast and mammals and comprise an inner kinetochore complex composed of 24 distinct proteins (KKT1 to KKT23, KKT25) that include four protein kinases, CLK1 (KKT10), CLK2 (KKT19), KKT2, and KKT3. We recently reported the identification of a specific trypanocidal inhibitor of T. brucei CLK1, an amidobenzimidazole, AB1. We now show that chemical inhibition of CLK1 with AB1 impairs inner kinetochore recruitment and compromises cell cycle progression, leading to cell death. Here, we show that KKT2 is a substrate for CLK1 and identify phosphorylation of S508 by CLK1 to be essential for KKT2 function and for kinetochore assembly. Additionally, KKT2 protein kinase activity is required for parasite proliferation but not for assembly of the inner kinetochore complex. We also show that chemical inhibition of the aurora kinase AUK1 does not affect CLK1 phosphorylation of KKT2, indicating that AUK1 and CLK1 are in separate regulatory pathways. We propose that CLK1 is part of a divergent signaling cascade that controls kinetochore function via phosphorylation of the inner kinetochore protein kinase KKT2. IMPORTANCE In eukaryotic cells, kinetochores are large protein complexes that link chromosomes to dynamic microtubule tips, ensuring proper segregation and genomic stability during cell division. Several proteins tightly coordinate kinetochore functions, including the protein kinase aurora kinase B. The kinetochore has diverse evolutionary roots. For example, trypanosomatids, single-cell parasitic protozoa that cause several neglected tropical diseases, possess a unique repertoire of kinetochore components whose regulation during the cell cycle remains unclear. Here, we shed light on trypanosomatid kinetochore biology by showing that the protein kinase CLK1 coordinates the assembly of the inner kinetochore by phosphorylating one of its components, KKT2, allowing the timely spatial recruitment of the rest of the kinetochore proteins and posterior attachment to microtubules in a process that is aurora kinase B independent.
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Affiliation(s)
- Manuel Saldivia
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
- Novartis Institute for Tropical Diseases, Emeryville, California, USA
| | - Adam J. M. Wollman
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
- York Biomedical Research Institute, Department of Physics, University of York, Heslington, United Kingdom
| | - Juliana B. T. Carnielli
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
| | - Nathaniel G. Jones
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
| | - Mark C. Leake
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
- York Biomedical Research Institute, Department of Physics, University of York, Heslington, United Kingdom
| | - Christopher Bower-Lepts
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
| | | | - Jeremy C. Mottram
- York Biomedical Research Institute, Department of Biology, University of York, Heslington, United Kingdom
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14
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Tarasovetc EV, Allu PK, Wimbish RT, DeLuca JG, Cheeseman IM, Black BE, Grishchuk EL. Permitted and restricted steps of human kinetochore assembly in mitotic cell extracts. Mol Biol Cell 2021; 32:1241-1255. [PMID: 33956511 PMCID: PMC8351545 DOI: 10.1091/mbc.e20-07-0461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 04/13/2021] [Accepted: 04/26/2021] [Indexed: 12/24/2022] Open
Abstract
Mitotic kinetochores assemble via the hierarchical recruitment of numerous cytosolic components to the centromere region of each chromosome. However, how these orderly and localized interactions are achieved without spurious macromolecular assemblies forming from soluble kinetochore components in the cell cytosol remains poorly understood. We developed assembly assays to monitor the recruitment of green fluorescent protein-tagged recombinant proteins and native proteins from human cell extracts to inner kinetochore components immobilized on microbeads. In contrast to prior work in yeast and Xenopus egg extracts, we find that human mitotic cell extracts fail to support de novo assembly of microtubule-binding subcomplexes. A subset of interactions, such as those between CENP-A-containing nucleosomes and CENP-C, are permissive under these conditions. However, the subsequent phospho-dependent binding of the Mis12 complex is less efficient, whereas recruitment of the Ndc80 complex is blocked, leading to weak microtubule-binding activity of assembled particles. Using molecular variants of the Ndc80 complex, we show that auto-inhibition of native Ndc80 complex restricts its ability to bind to the CENP-T/W complex, whereas inhibition of the Ndc80 microtubule binding is driven by a different mechanism. Together, our work reveals regulatory mechanisms that guard against the spurious formation of cytosolic microtubule-binding kinetochore particles.
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Affiliation(s)
- Ekaterina V. Tarasovetc
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Praveen Kumar Allu
- Department of Biochemistry and Biophysics, Penn Center for Genome Integrity, Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Robert T. Wimbish
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523
| | - Jennifer G. DeLuca
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523
| | | | - Ben E. Black
- Department of Biochemistry and Biophysics, Penn Center for Genome Integrity, Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Ekaterina L. Grishchuk
- Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
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15
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Wang LI, DeFosse T, Jang JK, Battaglia RA, Wagner VF, McKim KS. Borealin directs recruitment of the CPC to oocyte chromosomes and movement to the microtubules. J Cell Biol 2021; 220:211972. [PMID: 33836043 PMCID: PMC8185691 DOI: 10.1083/jcb.202006018] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 01/17/2021] [Accepted: 03/11/2021] [Indexed: 12/25/2022] Open
Abstract
The chromosomes in the oocytes of many animals appear to promote bipolar spindle assembly. In Drosophila oocytes, spindle assembly requires the chromosome passenger complex (CPC), which consists of INCENP, Borealin, Survivin, and Aurora B. To determine what recruits the CPC to the chromosomes and its role in spindle assembly, we developed a strategy to manipulate the function and localization of INCENP, which is critical for recruiting the Aurora B kinase. We found that an interaction between Borealin and the chromatin is crucial for the recruitment of the CPC to the chromosomes and is sufficient to build kinetochores and recruit spindle microtubules. HP1 colocalizes with the CPC on the chromosomes and together they move to the spindle microtubules. We propose that the Borealin interaction with HP1 promotes the movement of the CPC from the chromosomes to the microtubules. In addition, within the central spindle, rather than at the centromeres, the CPC and HP1 are required for homologous chromosome bi-orientation.
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Affiliation(s)
- Lin-Ing Wang
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, NJ
| | - Tyler DeFosse
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, NJ
| | - Janet K Jang
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, NJ
| | - Rachel A Battaglia
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, NJ
| | - Victoria F Wagner
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, NJ
| | - Kim S McKim
- Waksman Institute and Department of Genetics, Rutgers, the State University of New Jersey, Piscataway, NJ
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16
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Baroni M, Yi C, Choudhary S, Lei X, Kosti A, Grieshober D, Velasco M, Qiao M, Burns SS, Araujo PR, DeLambre T, Son MY, Plateroti M, Ferreira MAR, Hasty EP, Penalva LOF. Musashi1 Contribution to Glioblastoma Development via Regulation of a Network of DNA Replication, Cell Cycle and Division Genes. Cancers (Basel) 2021; 13:1494. [PMID: 33804958 PMCID: PMC8036803 DOI: 10.3390/cancers13071494] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 03/17/2021] [Accepted: 03/21/2021] [Indexed: 11/21/2022] Open
Abstract
RNA-binding proteins (RBPs) function as master regulators of gene expression. Alterations in their levels are often observed in tumors with numerous oncogenic RBPs identified in recent years. Musashi1 (Msi1) is an RBP and stem cell gene that controls the balance between self-renewal and differentiation. High Msi1 levels have been observed in multiple tumors including glioblastoma and are often associated with poor patient outcomes and tumor growth. A comprehensive genomic analysis identified a network of cell cycle/division and DNA replication genes and established these processes as Msi1's core regulatory functions in glioblastoma. Msi1 controls this gene network via two mechanisms: direct interaction and indirect regulation mediated by the transcription factors E2F2 and E2F8. Moreover, glioblastoma lines with Msi1 knockout (KO) displayed increased sensitivity to cell cycle and DNA replication inhibitors. Our results suggest that a drug combination strategy (Msi1 + cell cycle/DNA replication inhibitors) could be a viable route to treat glioblastoma.
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Affiliation(s)
- Mirella Baroni
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Caihong Yi
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
- Third Xiangya Hospital, Central South University, Changsha 410000, China
| | - Saket Choudhary
- Computational Biology and Bioinformatics, University of Southern California, Los Angeles, CA 90089, USA;
| | - Xiufen Lei
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Adam Kosti
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
- Department of Cell Systems and Anatomy, UT Health San Antonio, San Antonio, TX 78229, USA
| | - Denise Grieshober
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Mitzli Velasco
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Mei Qiao
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Suzanne S. Burns
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Patricia R. Araujo
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Talia DeLambre
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
| | - Mi Young Son
- Department of Molecular Medicine, Sam and Ann Barshop Institute for Longevity and Aging Studies, UT Health San Antonio, San Antonio, TX 78229, USA; (M.Y.S.); (E.P.H.)
| | - Michelina Plateroti
- Team: Development, Cancer and Stem Cells, Université de Strasbourg, Inserm, IRFAC/UMR-S1113, FMTS, 67200 Strasbourg, France;
| | | | - E. Paul Hasty
- Department of Molecular Medicine, Sam and Ann Barshop Institute for Longevity and Aging Studies, UT Health San Antonio, San Antonio, TX 78229, USA; (M.Y.S.); (E.P.H.)
| | - Luiz O. F. Penalva
- Children’s Cancer Research Institute, UT Health San Antonio, San Antonio, TX 78229, USA; (M.B.); (C.Y.); (X.L.); (A.K.); (D.G.); (M.V.); (M.Q.); (P.R.A.); (T.D.)
- Department of Cell Systems and Anatomy, UT Health San Antonio, San Antonio, TX 78229, USA
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The right place at the right time: Aurora B kinase localization to centromeres and kinetochores. Essays Biochem 2021; 64:299-311. [PMID: 32406506 DOI: 10.1042/ebc20190081] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 04/21/2020] [Accepted: 04/28/2020] [Indexed: 12/18/2022]
Abstract
The fidelity of chromosome segregation during mitosis is intimately linked to the function of kinetochores, which are large protein complexes assembled at sites of centromeric heterochromatin on mitotic chromosomes. These key "orchestrators" of mitosis physically connect chromosomes to spindle microtubules and transduce forces through these connections to congress chromosomes and silence the spindle assembly checkpoint. Kinetochore-microtubule attachments are highly regulated to ensure that incorrect attachments are not prematurely stabilized, but instead released and corrected. The kinase activity of the centromeric protein Aurora B is required for kinetochore-microtubule destabilization during mitosis, but how the kinase acts on outer kinetochore substrates to selectively destabilize immature and erroneous attachments remains debated. Here, we review recent literature that sheds light on how Aurora B kinase is recruited to both centromeres and kinetochores and discuss possible mechanisms for how kinase interactions with substrates at distinct regions of mitotic chromosomes are regulated.
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18
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The Proteomic Landscape of Centromeric Chromatin Reveals an Essential Role for the Ctf19 CCAN Complex in Meiotic Kinetochore Assembly. Curr Biol 2021; 31:283-296.e7. [PMID: 33157029 PMCID: PMC7846277 DOI: 10.1016/j.cub.2020.10.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/10/2020] [Accepted: 10/08/2020] [Indexed: 11/23/2022]
Abstract
Kinetochores direct chromosome segregation in mitosis and meiosis. Faithful gamete formation through meiosis requires that kinetochores take on new functions that impact homolog pairing, recombination, and the orientation of kinetochore attachment to microtubules in meiosis I. Using an unbiased proteomics pipeline, we determined the composition of centromeric chromatin and kinetochores at distinct cell-cycle stages, revealing extensive reorganization of kinetochores during meiosis. The data uncover a network of meiotic chromosome axis and recombination proteins that bind to centromeres in the absence of the microtubule-binding outer kinetochore sub-complexes during meiotic prophase. We show that the Ctf19cCCAN inner kinetochore complex is essential for kinetochore organization in meiosis. Our functional analyses identify a Ctf19cCCAN-dependent kinetochore assembly pathway that is dispensable for mitotic growth but becomes critical upon meiotic entry. Therefore, changes in kinetochore composition and a distinct assembly pathway specialize meiotic kinetochores for successful gametogenesis. The composition of meiotic centromeres and kinetochores is revealed Kinetochores undergo extensive changes between meiotic prophase I and metaphase I The Ctf19CCAN orchestrates meiotic kinetochore specialization A Ctf19CCAN-directed kinetochore assembly pathway is uniquely critical in meiosis
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19
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Meiotic CENP-C is a shepherd: bridging the space between the centromere and the kinetochore in time and space. Essays Biochem 2020; 64:251-261. [PMID: 32794572 DOI: 10.1042/ebc20190080] [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: 04/30/2020] [Revised: 07/15/2020] [Accepted: 07/20/2020] [Indexed: 01/10/2023]
Abstract
While many of the proteins involved in the mitotic centromere and kinetochore are conserved in meiosis, they often gain a novel function due to the unique needs of homolog segregation during meiosis I (MI). CENP-C is a critical component of the centromere for kinetochore assembly in mitosis. Recent work, however, has highlighted the unique features of meiotic CENP-C. Centromere establishment and stability require CENP-C loading at the centromere for CENP-A function. Pre-meiotic loading of proteins necessary for homolog recombination as well as cohesion also rely on CENP-C, as do the main scaffolding components of the kinetochore. Much of this work relies on new technologies that enable in vivo analysis of meiosis like never before. Here, we strive to highlight the unique role of this highly conserved centromere protein that loads on to centromeres prior to M-phase onset, but continues to perform critical functions through chromosome segregation. CENP-C is not merely a structural link between the centromere and the kinetochore, but also a functional one joining the processes of early prophase homolog synapsis to late metaphase kinetochore assembly and signaling.
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20
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Bonner MK, Haase J, Saunders H, Gupta H, Li BI, Kelly AE. The Borealin dimerization domain interacts with Sgo1 to drive Aurora B-mediated spindle assembly. Mol Biol Cell 2020; 31:2207-2218. [PMID: 32697622 PMCID: PMC7550704 DOI: 10.1091/mbc.e20-05-0341] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The chromosomal passenger complex (CPC), which includes the kinase Aurora B, is a master regulator of meiotic and mitotic processes that ensure the equal segregation of chromosomes. Sgo1 is thought to play a major role in the recruitment of the CPC to chromosomes, but the molecular mechanism and contribution of Sgo1-dependent CPC recruitment is currently unclear. Using Xenopus egg extracts and biochemical reconstitution, we found that Sgo1 interacts directly with the dimerization domain of the CPC subunit Borealin. Borealin and the PP2A phosphatase complex can bind simultaneously to the coiled-coil domain of Sgo1, suggesting that Sgo1 can integrate Aurora B and PP2A activities to modulate Aurora B substrate phosphorylation. A Borealin mutant that specifically disrupts the Sgo1–Borealin interaction results in defects in CPC chromosomal recruitment and Aurora B–dependent spindle assembly, but not in spindle assembly checkpoint signaling at unattached kinetochores. These findings establish a direct molecular connection between Sgo1 and the CPC and have major implications for the different functions of Aurora B, which promote the proper interaction between spindle microtubules and chromosomes.
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Affiliation(s)
- Mary Kate Bonner
- Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Julian Haase
- Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Hayden Saunders
- Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Hindol Gupta
- Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Biyun Iris Li
- Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
| | - Alexander E Kelly
- Laboratory of Biochemistry and Molecular Biology, National Cancer Institute, NIH, Bethesda, MD 20892
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21
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Killinger K, Böhm M, Steinbach P, Hagemann G, Blüggel M, Jänen K, Hohoff S, Bayer P, Herzog F, Westermann S. Auto-inhibition of Mif2/CENP-C ensures centromere-dependent kinetochore assembly in budding yeast. EMBO J 2020; 39:e102938. [PMID: 32515113 PMCID: PMC7360964 DOI: 10.15252/embj.2019102938] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 04/27/2020] [Accepted: 05/12/2020] [Indexed: 11/28/2022] Open
Abstract
Kinetochores are chromatin‐bound multi‐protein complexes that allow high‐fidelity chromosome segregation during mitosis and meiosis. Kinetochore assembly is exclusively initiated at chromatin containing Cse4/CENP‐A nucleosomes. The molecular mechanisms ensuring that subcomplexes assemble efficiently into kinetochores only at centromeres, but not anywhere else, are incompletely understood. Here, we combine biochemical and genetic experiments to demonstrate that auto‐inhibition of the conserved kinetochore subunit Mif2/CENP‐C contributes to preventing unscheduled kinetochore assembly in budding yeast cells. We show that wild‐type Mif2 is attenuated in its ability to bind a key downstream component in the assembly pathway, the Mtw1 complex, and that addition of Cse4 nucleosomes overcomes this inhibition. By exchanging the N‐terminus of Mif2 with its functional counterpart from Ame1/CENP‐U, we have created a Mif2 mutant which bypasses the Cse4 requirement for Mtw1 binding in vitro, thereby shortcutting kinetochore assembly. Expression of this Mif2 mutant in cells leads to mis‐localization of the Mtw1 complex and causes pronounced chromosome segregation defects. We propose that auto‐inhibition of Mif2/CENP‐C constitutes a key concept underlying the molecular logic of kinetochore assembly.
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Affiliation(s)
- Kerstin Killinger
- Department of Molecular Genetics, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Miriam Böhm
- Department of Molecular Genetics, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Philine Steinbach
- Department of Molecular Genetics, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Götz Hagemann
- Department of Biochemistry, Gene Center, Ludwig-Maximilians-Universität München, München, Germany
| | - Mike Blüggel
- Structural and Medicinal Biochemistry, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Karolin Jänen
- Department of Molecular Genetics, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Simone Hohoff
- Department of Molecular Genetics, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Peter Bayer
- Structural and Medicinal Biochemistry, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
| | - Franz Herzog
- Department of Biochemistry, Gene Center, Ludwig-Maximilians-Universität München, München, Germany
| | - Stefan Westermann
- Department of Molecular Genetics, Faculty of Biology, Center of Medical Biotechnology, University of Duisburg-Essen, Essen, Germany
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