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Cytokinesis

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https://www.readbyqxmd.com/read/28820333/protease-dead-separase-inhibits-chromosome-segregation-and-rab-11-vesicle-trafficking
#1
Xiaofei Bai, Joshua N Bembenek
Separase cleaves cohesin to allow chromosome segregation. Separase also regulates cortical granule exocytosis and vesicle trafficking during cytokinesis, both of which involve RAB-11. We investigated whether separase regulates exocytosis through a proteolytic or non-proteolytic mechanism. In C. elegans, protease-dead separase (SEP-1(PD)::GFP) is dominant negative. Consistent with its role in cohesin cleavage, SEP-1(PD)::GFP causes chromosome segregation defects. As expected, partial depletion of cohesin rescues this defect, confirming that SEP-1(PD)::GFP acts through a substrate trapping mechanism...
August 18, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28819246/transcriptome-analysis-reveals-plant-response-to-colchicine-treatment-during-on-chromosome-doubling
#2
Kai Zhou, Paige Fleet, Eviatar Nevo, Xinquan Zhang, Genlou Sun
Colchicine was commonly used to artificially double chromosomes while the transcriptome changes in colchicine treated plants has rarely been characterized. To understand the molecular mechanism of colchicine on chromosome doubling, we characterized transcriptome data of diploid orchardgrass root after colchicine treatment. Our results showed that 3381 of differentially expressed genes (DEGs) were mainly affected by water stress, 1258 DEGs that were expressed significantly in sample DacR5tr but not in DacR5ck were considered to be mainly affected by colchicine and combination of water and colchicine...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819014/cyclin-a2-modulates-kinetochore-microtubule-attachment-in-meiosis-ii
#3
Qing-Hua Zhang, Wai Shan Yuen, Deepak Adhikari, Jennifer A Flegg, Greg FitzHarris, Marco Conti, Piotr Sicinski, Ibtissem Nabti, Petros Marangos, John Carroll
Cyclin A2 is a crucial mitotic Cdk regulatory partner that coordinates entry into mitosis and is then destroyed in prometaphase within minutes of nuclear envelope breakdown. The role of cyclin A2 in female meiosis and its dynamics during the transition from meiosis I (MI) to meiosis II (MII) remain unclear. We found that cyclin A2 decreases in prometaphase I but recovers after the first meiotic division and persists, uniquely for metaphase, in MII-arrested oocytes. Conditional deletion of cyclin A2 from mouse oocytes has no discernible effect on MI but leads to disrupted MII spindles and increased merotelic attachments...
August 17, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28818726/identification-of-functional-interactome-of-a-key-cell-division-regulatory-protein-ceda-of-e-coli
#4
Pankaj Sharma, Anil Kumar Tomar, Bishwajit Kundu
Cell division is compromised in DnaAcos mutant Escherichia coli cells that results in filamentous cell morphology. This is countered by over-expression of CedA protein that induces cytokinesis and thus, regular cell morphology is regained; however via an unknown mechanism. To understand the process systematically, exact role of CedA should be deciphered. Protein interactions are crucial for functional organization of a cell and their identification helps in revealing exact function(s) of a protein and its binding partners...
August 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28810863/multiple-essential-functions-of-plasmodium-falciparum-actin-1-during-malaria-blood-stage-development
#5
Sujaan Das, Leandro Lemgruber, Chwen L Tay, Jake Baum, Markus Meissner
BACKGROUND: The phylum Apicomplexa includes intracellular parasites causing immense global disease burden, the deadliest of them being the human malaria parasite Plasmodium falciparum, which invades and replicates within erythrocytes. The cytoskeletal protein actin is well conserved within apicomplexans but divergent from mammalian actins, and was primarily reported to function during host cell invasion. However, novel invasion mechanisms have been described for several apicomplexans, and specific functions of the acto-myosin system are being reinvestigated...
August 15, 2017: BMC Biology
https://www.readbyqxmd.com/read/28808254/ikk2-regulates-cytokinesis-during-vertebrate-development
#6
Hongyuan Shen, Eun Myoung Shin, Serene Lee, Sinnakaruppan Mathavan, Hiromi Koh, Motomi Osato, Hyungwon Choi, Vinay Tergaonkar, Vladimir Korzh
NFκB signaling has a pivotal role in regulation of development, innate immunity, and inflammation. Ikk2 is one of the two critical kinases that regulate the NFκB signaling pathway. While the role of Ikk2 in immunity, inflammation and oncogenesis has received attention, an understanding of the role of Ikk2 in vertebrate development has been compounded by the embryonic lethality seen in mice lacking Ikk2. We find that despite abnormal angiogenesis in IKK2 zygotic mutants of zebrafish, the maternal activity of Ikk2 supports embryogenesis and maturation of fertile animals and allows to study the role of IKK2 in development...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808035/fission-yeast-myosin-myo2-is-down-regulated-in-actin-affinity-by-light-chain-phosphorylation
#7
Luther W Pollard, Carol S Bookwalter, Qing Tang, Elena B Krementsova, Kathleen M Trybus, Susan Lowey
Studies in fission yeast Schizosaccharomyces pombe have provided the basis for the most advanced models of the dynamics of the cytokinetic contractile ring. Myo2, a class-II myosin, is the major source of tension in the contractile ring, but how Myo2 is anchored and regulated to produce force is poorly understood. To enable more detailed biochemical/biophysical studies, Myo2 was expressed in the baculovirus/Sf9 insect cell system with its two native light chains, Rlc1 and Cdc4. Milligram yields of soluble, unphosphorylated Myo2 were obtained that exhibited high actin-activated ATPase activity and in vitro actin filament motility...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28807996/klhl6-deficiency-impairs-transitional-b-cell-survival-and-differentiation
#8
Barbara Bertocci, Damiana Lecoeuche, Delphine Sterlin, Julius Kühn, Baptiste Gaillard, Annie De Smet, Frederique Lembo, Christine Bole-Feysot, Nicolas Cagnard, Tatiana Fadeev, Auriel Dahan, Jean-Claude Weill, Claude-Agnès Reynaud
Klhl6 belongs to the KLHL gene family, which is composed of an N-terminal BTB-POZ domain and four to six Kelch motifs in tandem. Several of these proteins function as adaptors of the Cullin3 E3 ubiquitin ligase complex. In this article, we report that Klhl6 deficiency induces, as previously described, a 2-fold reduction in mature B cells. However, we find that this deficit is centered on the inability of transitional type 1 B cells to survive and to progress toward the transitional type 2 B cell stage, whereas cells that have passed this step generate normal germinal centers (GCs) upon a T-dependent immune challenge...
August 14, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28807993/nine-unanswered-questions-about-cytokinesis
#9
REVIEW
Thomas D Pollard
Experiments on model systems have revealed that cytokinesis in cells with contractile rings (amoebas, fungi, and animals) depends on shared molecular mechanisms in spite of some differences that emerged during a billion years of divergent evolution. Understanding these fundamental mechanisms depends on identifying the participating proteins and characterizing the mechanisms that position the furrow, assemble the contractile ring, anchor the ring to the plasma membrane, trigger ring constriction, produce force to form a furrow, disassemble the ring, expand the plasma membrane in the furrow, and separate the daughter cell membranes...
August 14, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28807940/mitotic-vulnerability-in-triple-negative-breast-cancer-associated-with-lin9-is-targetable-with-bet-inhibitors
#10
Jennifer M Sahni, Sylvia S Gayle, Bryan Webb, Kristen L Weber-Bonk, Darcie D Seachrist, Salendra Singh, Steven T Sizemore, Nicole A Restrepo, Gurkan Bebek, Peter Scacheri, Vinay Varadan, Matthew K Summers, Ruth A Keri
Triple-negative breast cancers (TNBC) are highly aggressive, lack FDA-approved targeted therapies, and frequently recur, making the discovery of novel therapeutic targets for this disease imperative. Our previous analysis of the molecular mechanisms of action of Bromodomain and extraterminal protein inhibitors (BETi) in TNBC revealed these drugs cause multinucleation, indicating BET proteins are essential for efficient mitosis and cytokinesis. Here, using live cell imaging, we show that BET inhibition prolonged mitotic progression and induced mitotic cell death, both of which are indicative of mitotic catastrophe...
August 14, 2017: Cancer Research
https://www.readbyqxmd.com/read/28803999/growth-arrest-and-morphological-changes-triggered-by-emodin-on-trypanosoma-cruzi-epimastigotes-cultivated-in-axenic-medium
#11
Ana R De Lima, Karem Noris-Suárez, Antonio Bretaña, Victor T Contreras, Maria C Navarro, Luis Pérez-Ybarra, José Bubis
Emodin is an anthraquinone obtained from Rheum palmatum rootstocks. Here we tested the cytotoxic effects of emodin on Trypanosoma cruzi epimastigotes, as well as the morphological changes that were induced by this compound in the parasite. Emodin was permeable and blocked in vitro cell division of T. cruzi epimastigotes in axenic medium, causing growth arrest in a dose-dependent but reversible manner. Emodin-exposed epimastigotes underwent duplication of organelles, such as the nucleus, kinetoplast and flagellum, but were incapable of completing cytokinesis...
August 10, 2017: Biochimie
https://www.readbyqxmd.com/read/28799433/cell-cycle-transcription-control-dream-muvb-and-rb-e2f-complexes
#12
Martin Fischer, Gerd A Müller
The precise timing of cell cycle gene expression is critical for the control of cell proliferation; de-regulation of this timing promotes the formation of cancer and leads to defects during differentiation and development. Entry into and progression through S phase requires expression of genes coding for proteins that function in DNA replication. Expression of a distinct set of genes is essential to pass through mitosis and cytokinesis. Expression of these groups of cell cycle-dependent genes is regulated by the RB pocket protein family, the E2F transcription factor family, and MuvB complexes together with B-MYB and FOXM1...
August 11, 2017: Critical Reviews in Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28794229/dock8-drives-src-dependent-nk-cell-effector-function
#13
Conor J Kearney, Stephin J Vervoort, Kelly M Ramsbottom, Andrew J Freeman, Jessica Michie, Jane Peake, Jean-Laurent Casanova, Capucine Picard, Stuart G Tangye, Cindy S Ma, Ricky W Johnstone, Katrina L Randall, Jane Oliaro
Mutations in the dedicator of cytokinesis 8 (DOCK8) gene cause an autosomal recessive form of hyper-IgE syndrome, characterized by chronic immunodeficiency with persistent microbial infection and increased incidence of malignancy. These manifestations suggest a defect in cytotoxic lymphocyte function and immune surveillance. However, how DOCK8 regulates NK cell-driven immune responses remains unclear. In this article, we demonstrate that DOCK8 regulates NK cell cytotoxicity and cytokine production in response to target cell engagement or receptor ligation...
August 9, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28782471/tgf-%C3%AE-1-causes-emt-by-regulating-n-acetyl-glucosaminyl-transferases-via-downregulation-of-non-muscle-myosin-ii-a-through-jnk-p38-pi3k-pathway-in-lung-cancer
#14
Ghulam Jilany Khan, Yingsheng Gao, Ming Gu, Lai Wang, Sara Khan, Farah Naeem, Bashir Alsiddig Yousef, Debmalya Roy, Herve Semukunzi, Shengtao Yuan, Li Sun
BACKGROUND: Epithelial to mesenchymal transition (EMT) is a major determinant of cancer metastasis and is closely linked with TGF-β1. Intracellular proteins, including E. Cadherin, N. Cadherin and Vimentin are directly related to EMT that affect cell migration and adhesion; on the other hand, non muscle myosin (NM) has a central role in cytokinesis, migration and adhesion. OBJECTIVE: We aimed to explore the association of EMT and metastasis with TGF-β1 through regulation of non-muscle myosin II-A (NMII-A) and its interaction with Hexosamine Biosynthesis Pathway (HBP)...
August 7, 2017: Current Cancer Drug Targets
https://www.readbyqxmd.com/read/28780319/cdk1-mediated-mitotic-phosphorylation-of-pbk-is-involved-in-cytokinesis-and-inhibits-its-oncogenic-activity
#15
Seth Stauffer, Yongji Zeng, Jiuli Zhou, Xingcheng Chen, Yuanhong Chen, Jixin Dong
PDZ-binding kinase (PBK) plays a major role in proliferation and in safeguarding mitotic fidelity in cancer cells. Frequently upregulated in many cancers, PBK drives tumorigenesis and metastasis. PBK has been shown to be phosphorylated in mitosis by cyclin-dependent kinase 1 (CDK1)/cyclin B, however, no studies have been done examining PBK mitotic phosphorylation in oncogenesis. Additionally to the previously identified Threonine-9 phosphorylation, we found that Threonine-24, Serine-32, and Serine-59 of PBK are also phosphorylated...
August 3, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28777669/impact-of-radiofrequency-radiation-on-dna-damage-and-antioxidants-in-peripheral-blood-lymphocytes-of-humans-residing-in-the-vicinity-of-mobile-phone-base-stations
#16
Zothansiama, Mary Zosangzuali, Miriam Lalramdinpuii, Ganesh Chandra Jagetia
Radiofrequency radiations (RFRs) emitted by mobile phone base stations have raised concerns on its adverse impact on humans residing in the vicinity of mobile phone base stations. Therefore, the present study was envisaged to evaluate the effect of RFR on the DNA damage and antioxidant status in cultured human peripheral blood lymphocytes (HPBLs) of individuals residing in the vicinity of mobile phone base stations and comparing it with healthy controls. The study groups matched for various demographic data including age, gender, dietary pattern, smoking habit, alcohol consumption, duration of mobile phone use and average daily mobile phone use...
August 4, 2017: Electromagnetic Biology and Medicine
https://www.readbyqxmd.com/read/28776372/structural-stability-of-the-coiled-coil-domain-of-tumor-susceptibility-gene-tsg-101
#17
Jordan T White, Dmitri Toptygin, Randy Cohen, Natalie Murphy, Vincent J Hilser
The Tumor Susceptibility Gene-101 coiled coil domain (TSG101cc) is an integral component of the endosomal maturation machinery and cytokinesis, and also interacts with several transcription factors. The TSG101cc has been crystalized as a homotetramer but is known to interact with two of its binding partners as a heterotrimer. To investigate this apparent discrepancy, we examined the solution thermodynamics of the TSG101cc. Here, we use circular dichroism, differential scanning calorimetry, analytical ultracentrifugation, fluorescence, and structural thermodynamic analysis to investigate the structural stability and the unfolding of the TSG101cc...
August 4, 2017: Biochemistry
https://www.readbyqxmd.com/read/28775097/platelet-derived-growth-factor-receptor-alpha-pdgfr%C3%AE-and-ras-related-c3-botulinum-toxin-substrate-1-rac1-regulate-mechano-responsiveness-of-lung-fibroblasts
#18
Stephen E McGowan, Diann M McCoy
Platelet-derived growth factor (PDGF)-A, which only signals through PDGF-receptor-alpha (PDGFRα) is required for secondary alveolar septal formation. Although PDGFRα distinguishes mesenchymal progenitor cells during the saccular stage, PDGFRα-expressing alveolar cells persist through adulthood. PDGF-A sustains proliferation, limits apoptosis, and maintains alpha-smooth muscle actin (αSMA) containing alveolar cells, which congregate at the alveolar entry ring at postnatal day (P)12. PDGFRα-expressing, αSMA-containing, alveolar cells re-distribute in the elongating septum, suggesting that they migrate to the alveolar entry rings where mechanical tension is higher...
August 3, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28770345/functions-and-regulation-of-the-polo-like-kinase-cdc5-in-the-absence-and-presence-of-dna-damage
#19
REVIEW
Vladimir V Botchkarev, James E Haber
Polo-like kinases are essential cell cycle regulators that are conserved from yeast to humans. Unlike higher eukaryotes, who express multiple Polo-like kinase family members that perform many important functions, budding yeast express only a single Polo-like kinase, Cdc5, which is the homolog of mammalian cell cycle master regulator Polo-like kinase 1. Cdc5 is a fascinating multifaceted protein that is programmed to target its many substrates in a timely, sequential manner to ensure proper cell cycle progression...
August 2, 2017: Current Genetics
https://www.readbyqxmd.com/read/28768828/sphingolipids-facilitate-age-asymmetry-of-membrane-proteins-in-dividing-yeast-cells
#20
Pushpendra Singh, Sree Kumar Ramachandran, Jin Zhu, Byoung Choul Kim, Debojyoti Biswas, Taekjip Ha, Pablo A Iglesias, Rong Li
A mechanism of cellular aging was proposed to be the gradual loss of certain cellular components that are insufficiently renewed. In an earlier study, multidrug resistance transporters (MDRs) were postulated to be such aging determinants during yeast replicative life span (RLS). Aged MDR proteins are asymmetrically retained by the aging mother cell and do not diffuse freely into the bud, whereas newly synthesized MDR proteins were thought to be deposited mostly in the bud prior to cytokinesis. In this study, we further demonstrate the proposed age asymmetry of MDR proteins in dividing yeast cells and investigated the mechanism that control diffusive properties of MDR proteins to maintain this asymmetry...
August 2, 2017: Molecular Biology of the Cell
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