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Добірка наукової літератури з теми "Nonmucle Myosin IIs (NM-IIs)"

Автор: Grafiati

Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Nonmucle Myosin IIs (NM-IIs)"

Lee, Kyoung Hwan, Guidenn Sulbarán, Shixin Yang, Ji Young Mun, Lorenzo Alamo, Antonio Pinto, Osamu Sato, et al. "Interacting-heads motif has been conserved as a mechanism of myosin II inhibition since before the origin of animals." Proceedings of the National Academy of Sciences 115, no. 9 (February 14, 2018): E1991—E2000. http://dx.doi.org/10.1073/pnas.1715247115.

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Electron microscope studies have shown that the switched-off state of myosin II in muscle involves intramolecular interaction between the two heads of myosin and between one head and the tail. The interaction, seen in both myosin filaments and isolated molecules, inhibits activity by blocking actin-binding and ATPase sites on myosin. This interacting-heads motif is highly conserved, occurring in invertebrates and vertebrates, in striated, smooth, and nonmuscle myosin IIs, and in myosins regulated by both Ca2+ binding and regulatory light-chain phosphorylation. Our goal was to determine how early this motif arose by studying the structure of inhibited myosin II molecules from primitive animals and from earlier, unicellular species that predate animals. Myosin II from Cnidaria (sea anemones, jellyfish), the most primitive animals with muscles, and Porifera (sponges), the most primitive of all animals (lacking muscle tissue) showed the same interacting-heads structure as myosins from higher animals, confirming the early origin of the motif. The social amoeba Dictyostelium discoideum showed a similar, but modified, version of the motif, while the amoeba Acanthamoeba castellanii and fission yeast (Schizosaccharomyces pombe) showed no head–head interaction, consistent with the different sequences and regulatory mechanisms of these myosins compared with animal myosin IIs. Our results suggest that head–head/head–tail interactions have been conserved, with slight modifications, as a mechanism for regulating myosin II activity from the emergence of the first animals and before. The early origins of these interactions highlight their importance in generating the inhibited (relaxed) state of myosin in muscle and nonmuscle cells.

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Dey, Sumit K., Raman K. Singh, Shyamtanu Chattoraj, Shekhar Saha, Alakesh Das, Kankan Bhattacharyya, Kaushik Sengupta, Shamik Sen, and Siddhartha S. Jana. "Differential role of nonmuscle myosin II isoforms during blebbing of MCF-7 cells." Molecular Biology of the Cell 28, no. 8 (April 15, 2017): 1034–42. http://dx.doi.org/10.1091/mbc.e16-07-0524.

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Bleb formation has been correlated with nonmuscle myosin II (NM-II) activity. Whether three isoforms of NM-II (NM-IIA, -IIB and -IIC) have the same or differential roles in bleb formation is not well understood. Here we report that ectopically expressed, GFP-tagged NM-II isoforms exhibit different types of membrane protrusions, such as multiple blebs, lamellipodia, combinations of both, or absence of any such protrusions in MCF-7 cells. Quantification suggests that 50% of NM-IIA-GFP–, 29% of NM-IIB-GFP–, and 19% of NM-IIC1-GFP–expressing MCF-7 cells show multiple bleb formation, compared with 36% of cells expressing GFP alone. Of interest, NM-IIB has an almost 50% lower rate of dissociation from actin filament than NM-IIA and –IIC1 as determined by FRET analysis both at cell and bleb cortices. We induced bleb formation by disruption of the cortex and found that all three NM-II-GFP isoforms can reappear and form filaments but to different degrees in the growing bleb. NM-IIB-GFP can form filaments in blebs in 41% of NM-IIB-GFP–expressing cells, whereas filaments form in only 12 and 3% of cells expressing NM-IIA-GFP and NM-IIC1-GFP, respectively. These studies suggest that NM-II isoforms have differential roles in the bleb life cycle.

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Wang, Aibing, Neil Billington, Robert S. Adelstein, and James R. Sellers. "Expression and Characterization of Full Length Nonmuscle Myosin IIs." Biophysical Journal 100, no. 3 (February 2011): 594a. http://dx.doi.org/10.1016/j.bpj.2010.12.3425.

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Lin, Yu-Hung, Yen-Yi Zhen, Kun-Yi Chien, I.-Ching Lee, Wei-Chi Lin, Mei-Yu Chen, and Li-Mei Pai. "LIMCH1 regulates nonmuscle myosin-II activity and suppresses cell migration." Molecular Biology of the Cell 28, no. 8 (April 15, 2017): 1054–65. http://dx.doi.org/10.1091/mbc.e15-04-0218.

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Nonmuscle myosin II (NM-II) is an important motor protein involved in cell migration. Incorporation of NM-II into actin stress fiber provides a traction force to promote actin retrograde flow and focal adhesion assembly. However, the components involved in regulation of NM-II activity are not well understood. Here we identified a novel actin stress fiber–associated protein, LIM and calponin-homology domains 1 (LIMCH1), which regulates NM-II activity. The recruitment of LIMCH1 into contractile stress fibers revealed its localization complementary to actinin-1. LIMCH1 interacted with NM-IIA, but not NM-IIB, independent of the inhibition of myosin ATPase activity with blebbistatin. Moreover, the N-terminus of LIMCH1 binds to the head region of NM-IIA. Depletion of LIMCH1 attenuated myosin regulatory light chain (MRLC) diphosphorylation in HeLa cells, which was restored by reexpression of small interfering RNA–resistant LIMCH1. In addition, LIMCH1-depleted HeLa cells exhibited a decrease in the number of actin stress fibers and focal adhesions, leading to enhanced cell migration. Collectively, our data suggest that LIMCH1 plays a positive role in regulation of NM-II activity through effects on MRLC during cell migration.

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Saha, Shekhar, Sumit K. Dey, Provas Das, and Siddhartha S. Jana. "Increased expression of nonmuscle myosin IIs is associated with 3MC-induced mouse tumor." FEBS Journal 278, no. 21 (September 19, 2011): 4025–34. http://dx.doi.org/10.1111/j.1742-4658.2011.08306.x.

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Yuen, Samantha L., Ozgur Ogut, and Frank V. Brozovich. "Nonmuscle myosin is regulated during smooth muscle contraction." American Journal of Physiology-Heart and Circulatory Physiology 297, no. 1 (July 2009): H191—H199. http://dx.doi.org/10.1152/ajpheart.00132.2009.

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The participation of nonmuscle myosin in force maintenance is controversial. Furthermore, its regulation is difficult to examine in a cellular context, as the light chains of smooth muscle and nonmuscle myosin comigrate under native and denaturing electrophoresis techniques. Therefore, the regulatory light chains of smooth muscle myosin (SM-RLC) and nonmuscle myosin (NM-RLC) were purified, and these proteins were resolved by isoelectric focusing. Using this method, intact mouse aortic smooth muscle homogenates demonstrated four distinct RLC isoelectric variants. These spots were identified as phosphorylated NM-RLC (most acidic), nonphosphorylated NM-RLC, phosphorylated SM-RLC, and nonphosphorylated SM-RLC (most basic). During smooth muscle activation, NM-RLC phosphorylation increased. During depolarization, the increase in NM-RLC phosphorylation was unaffected by inhibition of either Rho kinase or PKC. However, inhibition of Rho kinase blocked the angiotensin II-induced increase in NM-RLC phosphorylation. Additionally, force for angiotensin II stimulation of aortic smooth muscle from heterozygous nonmuscle myosin IIB knockout mice was significantly less than that of wild-type littermates, suggesting that, in smooth muscle, activation of nonmuscle myosin is important for force maintenance. The data also demonstrate that, in smooth muscle, the activation of nonmuscle myosin is regulated by Ca2+-calmodulin-activated myosin light chain kinase during depolarization and a Rho kinase-dependent pathway during agonist stimulation.

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Pleines, Irina, and Bernhard Nieswandt. "RhoA/ROCK guides NMII on the way to MK polyploidy." Blood 128, no. 26 (December 29, 2016): 3025–26. http://dx.doi.org/10.1182/blood-2016-11-746685.

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A unique feature of megakaryocyte maturation is the switch from mitosis to replication of DNA without cell division, a process termed endomitosis. In this issue of Blood, Roy et al elegantly demonstrate that RhoA/ROCK signaling is critical for the differential activity and localization of nonmuscle myosin (NM) IIA and IIB isoforms at the megakaryocyte cleavage furrow, a key step in the induction of endomitosis.1

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Breckenridge, Mark T., Natalya G. Dulyaninova, and Thomas T. Egelhoff. "Multiple Regulatory Steps Control Mammalian Nonmuscle Myosin II Assembly in Live Cells." Molecular Biology of the Cell 20, no. 1 (January 2009): 338–47. http://dx.doi.org/10.1091/mbc.e08-04-0372.

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To better understand the mechanism controlling nonmuscle myosin II (NM-II) assembly in mammalian cells, mutant NM-IIA constructs were created to allow tests in live cells of two widely studied models for filament assembly control. A GFP-NM-IIA construct lacking the RLC binding domain (ΔIQ2) destabilizes the 10S sequestered monomer state and results in a severe defect in recycling monomers during spreading, and from the posterior to the leading edge during polarized migration. A GFP-NM-IIA construct lacking the nonhelical tailpiece (Δtailpiece) is competent for leading edge assembly, but overassembles, suggesting defects in disassembly from lamellae subsequent to initial recruitment. The Δtailpiece phenotype was recapitulated by a GFP-NM-IIA construct carrying a mutation in a mapped tailpiece phosphorylation site (S1943A), validating the importance of the tailpiece and tailpiece phosphorylation in normal lamellar myosin II assembly control. These results demonstrate that both the 6S/10S conformational change and the tailpiece contribute to the localization and assembly of myosin II in mammalian cells. This work furthermore offers cellular insights that help explain platelet and leukocyte defects associated with R1933-stop alleles of patients afflicted with human MYH9-related disorder.

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Osagie, Oloruntoba Ismail, Zhigui Li, Shijun Mi, Jennifer T. Aguilan, and Gloria S. Huang. "ARID1A interacts with nonmuscle myosin IIA to regulate cancer cell motility." Journal of Clinical Oncology 37, no. 15_suppl (May 20, 2019): e17036-e17036. http://dx.doi.org/10.1200/jco.2019.37.15_suppl.e17036.

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e17036 Background: ARID1A (BAF250A), a member of the SWI/SNF chromatin remodeling complex, is one of the most frequently mutated genes in human cancer. Here we report the discovery of a novel protein-protein interaction between ARID1A and the actin-binding motor protein, non-muscle myosin IIA (NM IIA) encoded by the myosin heavy chain 9 ( MYH9). Methods: The ARID1A immunoprecipitated protein complex was separated by gel electrophoresis followed by analysis of the peptide digested gel bands by C18-Reversed Phase chromatography using an Ultimate 3000 RSLCnano System (Thermo Scientific) equipped with an Acclaim PepMap C18 column (Thermo Scientific) and connected to a TriVersa NanoMate nanoelectrospray source (Advion) and a linear ion trap LTQ-XL mass spectrometer (Thermo Scientific). Protein identification was performed by Mascot search engine v. 2.5.1 (Matrix Science) against NCBI Homo sapiens database. Scaffold software v. 4.5.1 (Proteome Software Inc.) was used to validate the MS/MS peptide and protein identification based on 99% protein and 95% peptide probabilities. Immunoprecipitation and immunoblotting were done to evaluate the protein-protein interaction in ARID1A-wild type cell lines. Isogenic engineered cell lines, ES2 shRNA-control or shRNA- ARID1A stable transfection , and HCT116 control or ARID1A knockout by CRISPR-Cas9 (Horizon Discovery) were used to evaluate the effect of ARID1A loss on NM IIA expression and phosphorylation, and on cell migration by in vitro scratch assay with time lapse imaging. Results: Scaffold analysis of peptide spectra identified NM IIA with > 99% probability in the ARID1A immunopurified protein complex. In the ARID1A wildtype cell lines ES2 and KLE, endogenous NM IIA co-immunoprecipitated with ARID1A and vice versa. ES2 sh ARID1A cells had decreased total and phosphorylated NM IIA expression, and impaired cell migration compared to control cells. Similarly, HCT116 ARID1A homozygous knockout cells had impaired cell migration compared with HCT116 control cells. Conclusions: We report for the first time that ARID1A interacts with NM IIA to regulate cancer cell motility. Further investigation is ongoing to elucidate the significance of this newly identified function of ARID1A.

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Liu, Xiong, Neil Billington, Shi Shu, Shu-Hua Yu, Grzegorz Piszczek, James R. Sellers, and Edward D. Korn. "Effect of ATP and regulatory light-chain phosphorylation on the polymerization of mammalian nonmuscle myosin II." Proceedings of the National Academy of Sciences 114, no. 32 (July 24, 2017): E6516—E6525. http://dx.doi.org/10.1073/pnas.1702375114.

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Addition of 1 mM ATP substantially reduces the light scattering of solutions of polymerized unphosphorylated nonmuscle myosin IIs (NM2s), and this is reversed by phosphorylation of the regulatory light chain (RLC). It has been proposed that these changes result from substantial depolymerization of unphosphorylated NM2 filaments to monomers upon addition of ATP, and filament repolymerization upon RLC-phosphorylation. We now show that the differences in myosin monomer concentration of RLC-unphosphorylated and -phosphorylated recombinant mammalian NM2A, NM2B, and NM2C polymerized in the presence of ATP are much too small to explain their substantial differences in light scattering. Rather, we find that the decrease in light scattering upon addition of ATP to polymerized unphosphorylated NM2s correlates with the formation of dimers, tetramers, and hexamers, in addition to monomers, an increase in length, and decrease in width of the bare zones of RLC-unphosphorylated filaments. Both effects of ATP addition are reversed by phosphorylation of the RLC. Our data also suggest that, contrary to previous models, assembly of RLC-phosphorylated NM2s at physiological ionic strength proceeds from folded monomers to folded antiparallel dimers, tetramers, and hexamers that unfold and polymerize into antiparallel filaments. This model could explain the dynamic relocalization of NM2 filaments in vivo by dephosphorylation of RLC-phosphorylated filaments, disassembly of the dephosphorylated filaments to folded monomers, dimers, and small oligomers, followed by diffusion of these species, and reassembly of filaments at the new location following rephosphorylation of the RLC.

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