1
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Fujiwara T, Mano E, Nango E. Structural basis for the minimal bifunctional alginate epimerase AlgE3 from Azotobacter chroococcum. FEBS Lett 2024. [PMID: 38649293 DOI: 10.1002/1873-3468.14886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/15/2024] [Accepted: 03/23/2024] [Indexed: 04/25/2024]
Abstract
Among the epimerases specific to alginate, some of them in Azotobacter genera convert β-d-mannuronic acid to α-l-guluronic acid but also have lyase activity to degrade alginate. The remarkable characteristics of these epimerases make it a promising enzyme for tailoring alginates to meet specific demands. Here, we determined the structure of the bifunctional mannuronan C-5 epimerase AlgE3 from Azotobacter chroococcum (AcAlgE3) in complex with several mannuronic acid oligomers as well as in apo form, which allowed us to elucidate the binding manner of each mannuronic acid oligomer, and the structural plasticity, which is dependent on calcium ions. Moreover, a comprehensive analysis of the lyase activity profiles of AcAlgE3 combined with structural characteristics explained the preference for different chain length oligomers.
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Affiliation(s)
- Takaaki Fujiwara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Eriko Nango
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
- RIKEN SPring-8 Center, Sayo-gun, Japan
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2
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Karna D, Mano E, Ji J, Kawamata I, Suzuki Y, Mao H. Chemo-mechanical forces modulate the topology dynamics of mesoscale DNA assemblies. Nat Commun 2023; 14:6459. [PMID: 37833326 PMCID: PMC10575982 DOI: 10.1038/s41467-023-41604-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 09/06/2023] [Indexed: 10/15/2023] Open
Abstract
The intrinsic complexity of many mesoscale (10-100 nm) cellular machineries makes it challenging to elucidate their topological arrangement and transition dynamics. Here, we exploit DNA origami nanospring as a model system to demonstrate that tens of piconewton linear force can modulate higher-order conformation dynamics of mesoscale molecular assemblies. By switching between two chemical structures (i.e., duplex and tetraplex DNA) in the junctions of adjacent origami modules, the corresponding stretching or compressing chemo-mechanical stress reversibly flips the backbone orientations of the DNA nanosprings. Both coarse-grained molecular dynamics simulations and atomic force microscopy measurements reveal that such a backbone conformational switch does not alter the right-handed chirality of the nanospring helix. This result suggests that mesoscale helical handedness may be governed by the torque, rather than the achiral orientation, of nanospring backbones. It offers a topology-based caging/uncaging concept to present chemicals in response to environmental cues in solution.
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Affiliation(s)
- Deepak Karna
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH, 44242, USA
| | - Eriko Mano
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-aza Aoba, Aoba-ku, Sendai, 980-8578, Japan
| | - Jiahao Ji
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH, 44242, USA
| | - Ibuki Kawamata
- Department of Robotics, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai, 980-8579, Japan.
| | - Yuki Suzuki
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-aza Aoba, Aoba-ku, Sendai, 980-8578, Japan.
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya-Cho, Tsu, 514-8507, Japan.
| | - Hanbin Mao
- Department of Chemistry and Biochemistry, Kent State University, Kent, OH, 44242, USA.
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3
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Chuong TT, Ogura T, Hiyoshi N, Takahashi K, Lee S, Hiraga K, Iwase H, Yamaguchi A, Kamagata K, Mano E, Hamakawa S, Nishihara H, Kyotani T, Stucky GD, Itoh T. Giant Carbon Nano-Test Tubes as Versatile Imaging Vessels for High-Resolution and In Situ Observation of Proteins. ACS Appl Mater Interfaces 2022; 14:26507-26516. [PMID: 35548999 DOI: 10.1021/acsami.2c06318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Cryogenic electron microscopy is one of the fastest and most robust methods for capturing high-resolution images of proteins, but stringent sample preparation, imaging conditions, and in situ radiation damage inflicted during data acquisition directly affect the resolution and ability to capture dynamic details, thereby limiting its broader utilization and adoption for protein studies. We addressed these drawbacks by introducing synthesized giant carbon nano-test tubes (GCNTTs) as radiation-insulating materials that lessen the irradiation impact on the protein during data acquisition, physical molecular concentrators that localize the proteins within a nanoscale field of view, and vessels that create a microenvironment for solution-phase imaging. High-resolution electron microscopy images of single and aggregated hemoglobin molecules within GCNTTs in both solid and solution states were acquired. Subsequent scanning transmission electron microscopy, small-angle neutron scattering, and fluorescence studies demonstrated that the GCNTT vessel protected the hemoglobin molecules from electron irradiation-, light-, or heat-induced denaturation. To demonstrate the robustness of GCNTT as an imaging platform that could potentially augment the study of proteins, we demonstrated the robustness of the GCNTT technique to image an alternative protein, d-fructose dehydrogenase, after cyclic voltammetry experiments to review encapsulation and binding insights. Given the simplicity of the material synthesis, sample preparation, and imaging technique, GCNTT is a promising imaging companion for high-resolution, single, and dynamic protein studies under electron microscopy.
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Affiliation(s)
- Tracy T Chuong
- National Institute of Advanced Industrial Science Technology (AIST), Sendai 983-8551, Japan
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106-9510, United States
| | - Toshihiko Ogura
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8566, Japan
| | - Norihito Hiyoshi
- National Institute of Advanced Industrial Science Technology (AIST), Sendai 983-8551, Japan
| | - Kazuma Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Sangho Lee
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Keita Hiraga
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Hiroki Iwase
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | - Akira Yamaguchi
- Institute of Quantum Beam Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan
| | - Kiyoto Kamagata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Satoshi Hamakawa
- National Institute of Advanced Industrial Science Technology (AIST), Sendai 983-8551, Japan
| | - Hirotomo Nishihara
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Takashi Kyotani
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Galen D Stucky
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106-9510, United States
| | - Tetsuji Itoh
- National Institute of Advanced Industrial Science Technology (AIST), Sendai 983-8551, Japan
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4
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Suzuki Y, Kawamata I, Watanabe K, Mano E. Lipid bilayer-assisted dynamic self-assembly of hexagonal DNA origami blocks into monolayer crystalline structures with designed geometries. iScience 2022; 25:104292. [PMID: 35573202 PMCID: PMC9097702 DOI: 10.1016/j.isci.2022.104292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 03/18/2022] [Accepted: 04/19/2022] [Indexed: 11/17/2022] Open
Abstract
The DNA origami technique is used to construct custom-shaped nanostructures that can be used as components of two-dimensional crystalline structures with user-defined structural patterns. Here, we designed an Mg2+-responsive hexagonal 3D DNA origami block with self-shape-complementary ruggedness on the sides. Hexagonal DNA origami blocks were electrostatically adsorbed onto a fluidic lipid bilayer membrane surface to ensure lateral diffusion. A subsequent increase in the Mg2+ concentration in the surrounding environment induced the self-assembly of the origami blocks into lattices with prescribed geometries based on a self-complementary shape fit. High-speed atomic force microscopy (HS-AFM) images revealed dynamic events involved in the self-assembly process, including edge reorganization, defect splitting, diffusion, and filling, which provide a glimpse into how the lattice structures are self-improved. Lipid bilayer-assisted self-assembly of 3D DNA origami blocks was achieved Time-lapse AFM imaging of the self-assembly processes was performed Different assembly patterns were achieved from a single DNA origami design
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Affiliation(s)
- Yuki Suzuki
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8578, Japan
- Corresponding author
| | - Ibuki Kawamata
- Department of Robotics, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Kotaro Watanabe
- Department of Robotics, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Eriko Mano
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8578, Japan
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5
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Abdelhady AM, Onizuka K, Ishida K, Yajima S, Mano E, Nagatsugi F. Rapid Alkene-Alkene Photo-Cross-Linking on the Base-Flipping-Out Field in Duplex DNA. J Org Chem 2022; 87:2267-2276. [PMID: 34978198 DOI: 10.1021/acs.joc.1c01498] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Specific chemical reactions by enzymes acting on a nucleobase are realized by flipping the target base out of the helix. Similarly, artificial oligodeoxynucleotides (ODNs) can also induce the base flipping and a specific chemical reaction. We now report an easily prepared and unique structure-providing photo-cross-linking reaction by taking advantage of the base-flipping-out field formed by alkene-type base-flipping-inducing artificial bases. Two 3-arylethenyl-5-methyl-2-pyridone nucleosides with the Ph or An group were synthesized and incorporated into the ODNs. We found that the two Ph derivatives provided the cross-linked product in a high yield only by a 10 s photoirradiation when their alkenes overlap each other in the duplex DNA. The highly efficient reaction enabled forming a cross-linked product even when using the duplex with a low Tm value.
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Affiliation(s)
- Ahmed Mostafa Abdelhady
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.,Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt
| | - Kazumitsu Onizuka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.,Division for the Establishment of Frontier Sciences of Organization for Advanced Studies, Tohoku University, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Kei Ishida
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Sayaka Yajima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Fumi Nagatsugi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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6
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Kamagata K, Itoh Y, Tan C, Mano E, Wu Y, Mandali S, Takada S, Johnson RC. Testing mechanisms of DNA sliding by architectural DNA-binding proteins: dynamics of single wild-type and mutant protein molecules in vitro and in vivo. Nucleic Acids Res 2021; 49:8642-8664. [PMID: 34352099 PMCID: PMC8421229 DOI: 10.1093/nar/gkab658] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 07/10/2021] [Accepted: 07/22/2021] [Indexed: 01/06/2023] Open
Abstract
Architectural DNA-binding proteins (ADBPs) are abundant constituents of eukaryotic or bacterial chromosomes that bind DNA promiscuously and function in diverse DNA reactions. They generate large conformational changes in DNA upon binding yet can slide along DNA when searching for functional binding sites. Here we investigate the mechanism by which ADBPs diffuse on DNA by single-molecule analyses of mutant proteins rationally chosen to distinguish between rotation-coupled diffusion and DNA surface sliding after transient unbinding from the groove(s). The properties of yeast Nhp6A mutant proteins, combined with molecular dynamics simulations, suggest Nhp6A switches between two binding modes: a static state, in which the HMGB domain is bound within the minor groove with the DNA highly bent, and a mobile state, where the protein is traveling along the DNA surface by means of its flexible N-terminal basic arm. The behaviors of Fis mutants, a bacterial nucleoid-associated helix-turn-helix dimer, are best explained by mobile proteins unbinding from the major groove and diffusing along the DNA surface. Nhp6A, Fis, and bacterial HU are all near exclusively associated with the chromosome, as packaged within the bacterial nucleoid, and can be modeled by three diffusion modes where HU exhibits the fastest and Fis the slowest diffusion.
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Affiliation(s)
- Kiyoto Kamagata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Yuji Itoh
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Cheng Tan
- Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Yining Wu
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Sridhar Mandali
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1737, USA
| | - Shoji Takada
- Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Reid C Johnson
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1737, USA.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
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7
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Kamagata K, Ouchi K, Tan C, Mano E, Mandali S, Wu Y, Takada S, Takahashi S, Johnson RC. The HMGB chromatin protein Nhp6A can bypass obstacles when traveling on DNA. Nucleic Acids Res 2020; 48:10820-10831. [PMID: 32997109 PMCID: PMC7641734 DOI: 10.1093/nar/gkaa799] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 08/13/2020] [Accepted: 09/15/2020] [Indexed: 12/16/2022] Open
Abstract
DNA binding proteins rapidly locate their specific DNA targets through a combination of 3D and 1D diffusion mechanisms, with the 1D search involving bidirectional sliding along DNA. However, even in nucleosome-free regions, chromosomes are highly decorated with associated proteins that may block sliding. Here we investigate the ability of the abundant chromatin-associated HMGB protein Nhp6A from Saccharomyces cerevisiae to travel along DNA in the presence of other architectural DNA binding proteins using single-molecule fluorescence microscopy. We observed that 1D diffusion by Nhp6A molecules is retarded by increasing densities of the bacterial proteins Fis and HU and by Nhp6A, indicating these structurally diverse proteins impede Nhp6A mobility on DNA. However, the average travel distances were larger than the average distances between neighboring proteins, implying Nhp6A is able to bypass each of these obstacles. Together with molecular dynamics simulations, our analyses suggest two binding modes: mobile molecules that can bypass barriers as they seek out DNA targets, and near stationary molecules that are associated with neighboring proteins or preferred DNA structures. The ability of mobile Nhp6A molecules to bypass different obstacles on DNA suggests they do not block 1D searches by other DNA binding proteins.
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Affiliation(s)
- Kiyoto Kamagata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.,Graduate School of Life Sciences, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.,Department of Chemistry, Faculty of Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Kana Ouchi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.,Graduate School of Life Sciences, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Cheng Tan
- Computational Biophysics Research Team, RIKEN Center for Computational Science, 7-1-26 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Sridhar Mandali
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1737 USA
| | - Yining Wu
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.,Department of Chemistry, Faculty of Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Shoji Takada
- Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Satoshi Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.,Graduate School of Life Sciences, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.,Department of Chemistry, Faculty of Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Reid C Johnson
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095-1737 USA.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
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8
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Abstract
The base flip-inducing nucleic acids are expected to create a specific field for various chemical reactions. We now report a novel type of base-flip-inducing oligodeoxynucleotide and photo-cross-linking reaction. Two 3-arylethynyl-5-methyl-2-pyridone nucleosides, Ph and An, were synthesized, and their properties were investigated. The alkyne-alkyne photo-cross-linking rapidly proceeded by taking advantage of the base-flipping-out field where two alkynes overlap each other. This photo-cross-linking would be a new candidate to form cross-linked DNAs.
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Affiliation(s)
- Kazumitsu Onizuka
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai , Miyagi 980-8577 , Japan.,Department of Chemistry, Graduate School of Science , Tohoku University , Aoba-ku, Sendai 980-8578 , Japan
| | - Kei Ishida
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai , Miyagi 980-8577 , Japan.,Department of Chemistry, Graduate School of Science , Tohoku University , Aoba-ku, Sendai 980-8578 , Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai , Miyagi 980-8577 , Japan
| | - Fumi Nagatsugi
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai , Miyagi 980-8577 , Japan.,Department of Chemistry, Graduate School of Science , Tohoku University , Aoba-ku, Sendai 980-8578 , Japan
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9
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Kamagata K, Mano E, Ouchi K, Kanbayashi S, Johnson RC. High Free-Energy Barrier of 1D Diffusion Along DNA by Architectural DNA-Binding Proteins. J Mol Biol 2018; 430:655-667. [PMID: 29307468 DOI: 10.1016/j.jmb.2018.01.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/13/2017] [Accepted: 01/02/2018] [Indexed: 01/25/2023]
Abstract
Architectural DNA-binding proteins function to regulate diverse DNA reactions and have the defining property of significantly changing DNA conformation. Although the 1D movement along DNA by other types of DNA-binding proteins has been visualized, the mobility of architectural DNA-binding proteins on DNA remains unknown. Here, we applied single-molecule fluorescence imaging on arrays of extended DNA molecules to probe the binding dynamics of three structurally distinct architectural DNA-binding proteins: Nhp6A, HU, and Fis. Each of these proteins was observed to move along DNA, and the salt concentration independence of the 1D diffusion implies sliding with continuous contact to DNA. Nhp6A and HU exhibit a single sliding mode, whereas Fis exhibits two sliding modes. Based on comparison of the diffusion coefficients and sizes of many DNA binding proteins, the architectural proteins are categorized into a new group distinguished by an unusually high free-energy barrier for 1D diffusion. The higher free-energy barrier for 1D diffusion by architectural proteins can be attributed to the large DNA conformational changes that accompany binding and impede rotation-coupled movement along the DNA grooves.
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Affiliation(s)
- Kiyoto Kamagata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan; Graduate School of Life Sciences, Tohoku University, Katahira 2-1-1, Aoba-ku, Aoba-ku, Sendai980-8577, Japan.
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Kana Ouchi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan; Graduate School of Life Sciences, Tohoku University, Katahira 2-1-1, Aoba-ku, Aoba-ku, Sendai980-8577, Japan
| | - Saori Kanbayashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - Reid C Johnson
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA90095-1737, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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10
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Murata A, Itoh Y, Mano E, Kanbayashi S, Igarashi C, Takahashi H, Takahashi S, Kamagata K. One-Dimensional Search Dynamics of Tumor Suppressor p53 Regulated by a Disordered C-Terminal Domain. Biophys J 2017; 112:2301-2314. [PMID: 28591603 DOI: 10.1016/j.bpj.2017.04.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 04/06/2017] [Accepted: 04/25/2017] [Indexed: 11/15/2022] Open
Abstract
Tumor suppressor p53 slides along DNA and finds its target sequence in drastically different and changing cellular conditions. To elucidate how p53 maintains efficient target search at different concentrations of divalent cations such as Ca2+ and Mg2+, we prepared two mutants of p53, each possessing one of its two DNA-binding domains, the CoreTet mutant having the structured core domain plus the tetramerization (Tet) domain, and the TetCT mutant having Tet plus the disordered C-terminal domain. We investigated their equilibrium and kinetic dissociation from DNA and search dynamics along DNA at various [Mg2+]. Although binding of CoreTet to DNA becomes markedly weaker at higher [Mg2+], binding of TetCT depends slightly on [Mg2+]. Single-molecule fluorescence measurements revealed that the one-dimensional diffusion of CoreTet along DNA consists of fast and slow search modes, the ratio of which depends strongly on [Mg2+]. In contrast, diffusion of TetCT consisted of only the fast mode. The disordered C-terminal domain can associate with DNA irrespective of [Mg2+], and can maintain an equilibrium balance of the two search modes and the p53 search distance. These results suggest that p53 modulates the quaternary structure of the complex between p53 and DNA under different [Mg2+] and that it maintains the target search along DNA.
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Affiliation(s)
- Agato Murata
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan; Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Yuji Itoh
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan; Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Eriko Mano
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Saori Kanbayashi
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Chihiro Igarashi
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan; Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Hiroto Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
| | - Satoshi Takahashi
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan.
| | - Kiyoto Kamagata
- Institute of Multidisciplinary Research for Advanced Materials, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan.
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11
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Abstract
In higher plants, stems and roots show negative and positive gravitropism, respectively. However, current knowledge on the graviresponse of leaves is lacking. In this study, we analyzed the positioning and movement of rosette leaves of Arabidopsis thaliana under light and dark conditions. We found that the radial positioning of rosette leaves was not affected by the direction of gravity under continuous white light. In contrast, when plants were shifted to darkness, the leaves moved upwards, suggesting negative gravitropism. Analysis of the phosphoglucomutase and shoot gravitropism 2-1 mutants revealed that the sedimenting amyloplasts in the leaf petiole are important for gravity perception, as is the case in stems and roots. In addition, our detailed physiological analyses revealed a unique feature of leaf movement after the shift to darkness, i.e. movement could be divided into negative gravitropism and nastic movement. The orientation of rosette leaves is ascribed to a combination of these movements.
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Affiliation(s)
- Eriko Mano
- Department of Biosystems Science, School of Advanced Sciences, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa, 204-0193 Japan
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12
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Hidari KIPJ, Tsujii E, Hiroi J, Mano E, Miyatake A, Miyamoto D, Suzuki T, Suzuki Y. In vitro and in vivo inhibitory effects of disodium cromoglycate on influenza virus infection. Biol Pharm Bull 2005; 27:825-30. [PMID: 15187427 DOI: 10.1248/bpb.27.825] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Disodium cromoglycate (DSCG) is one of the safest drugs for the prevention of bronchial asthma and allergic rhinitis attacks. The effect of DSCG on acute upper respiratory tract viral infection is still controversial. Here we investigated DSCG inhibition of influenza virus infection in vivo and in vitro. In vivo effects of DSCG on viral infection were assessed using a murine model of respiratory tract infection. Intranasal administration of DSCG protected mice from death induced by infection with influenza virus A/PR/8/34. We analyzed DSCG anti-viral effects in vitro by either (i) treating cells prior to viral adsorption, (ii) treating cells concurrently with viral adsorption, or (iii) treating cells after viral adsorption. DSCG treatment of cells during or after, but not before, viral adsorption significantly inhibited influenza viral infection, indicating DSCG acts on events late in viral infection. DSCG exerts anti-influenza effect both in vitro and in vivo at the doses compatible with treatment for asthma. DSCG marginally inhibited influenza viral neuraminidase and membrane fusion functions, suggesting that DSCG inhibition of viral neuraminidase and fusion activities may partially mediate this anti-influenza effect. Our results indicate that treatment of patients including children with DSCG may take advantages for prevention from influenza virus infection.
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Affiliation(s)
- Kazuya I P J Hidari
- Department of Biochemistry, University of Shizuoka, School of Pharmaceutical Sciences, Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Yada, Shizuoka, Japan.
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13
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Ohtake N, Yamada K, Mano E, Okamoto O, Ushijima R, Nakagawa S. 1 beta-Methyl-2(5-substituted pyrrolidin-3-ylthio)carbapenems. 1. Synthesis and antibacterial activity of BO-2502A and its related compounds. J Antibiot (Tokyo) 1997; 50:567-85. [PMID: 9711249 DOI: 10.7164/antibiotics.50.567] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and biological activity of (1R,5S,6S)-2-[(3S,5S)-5-substituted pyrrolidin-3-ylthio]-6-[(R)-1-hydroxyethyl]-1-methyl-1-ca rbapen-2-em-3- carboxylic acid, in which lactams and cyclic amines are introduced as substituents, are described. They showed potent antibacterial activity against Gram-positive and Gram-negative bacteria including P. aeruginosa. Among them, BO-2502A (4h-1) was selected for further evaluation.
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Affiliation(s)
- N Ohtake
- Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Japan
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14
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Arakawa H, Mano E, Hakoda N, Yoshinari T, Nakagawa S, Okura A. Potent antitumor activity of quinolone compounds with an unsaturated aminoazabicyclo group at the C-7 position of the quinolone ring. Anticancer Drug Des 1996; 11:221-9. [PMID: 8663909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Relationships between the substituents on the quinolone nucleus of 2 and related compounds and their biological activities were studied. 2, 3 and 1 carrying a (1R, 2R, 6R)-2-amino-8-azabicyclo[4.3.0.]non-3-en-8-yl group at the C-7 position increased the rate of formation of DNA-protein complexes in cells, and inhibited the growth of tumor cells more strongly than the compounds with other substituents. The introduction of a fluorine atom or a methoxy group at the 8-position and an amino group at the 5-position increased the activity still further. The three compounds listed were all effective against P388 leukemia in mice. Subcutaneous injection of 2 at 2 mg/kg strongly suppressed the growth of human MX-1 breast cancer cells in nude mice. 1 has various functional groups that increase the cytotoxic potential of quinolone derivatives: a (1R, 2R, 6R)-2-amino-8-azabicyclo[4.3.0.]non-3-en-8-yl moiety at C-7, a cyclopropyl group at the 1-position, fluorine atoms at the 6- and 8-positions, and an amino group at the 5-position of the quinoline carboxylic acid. These data suggest that this series of compounds provide good models for the further design of potent antitumor quinolones.
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Affiliation(s)
- H Arakawa
- Banyu Tsukuba Research Institute, Merck Research Laboratories, Japan
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15
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Yoshinari T, Mano E, Arakawa H, Kurama M, Iguchi T, Nakagawa S, Tanaka N, Okura A. Stereo (C7)-dependent topoisomerase II inhibition and tumor growth suppression by a new quinolone, BO-2367. Jpn J Cancer Res 1993; 84:800-6. [PMID: 8396568 PMCID: PMC5919197 DOI: 10.1111/j.1349-7006.1993.tb02047.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A new antimicrobial quinolone (-)BO-2367, (-)-7-[(1R*, 2R*, 6R*)-2-amino-8-azabicyclo[4.3.0.]-non-3-en-8-yl]-1- cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, strongly inhibited both mammalian and bacterial topoisomerase II. The IC50 values of (-)BO-2367 against the DNA relaxation activity of L1210 topoisomerase II and the supercoiling activities of Escherichia coli gyrase and Micrococcus luteus gyrase were 3.8, 0.5, and 1 microM, respectively. This compound enhanced double-stranded DNA cleavage mediated by topoisomerase II not only with purified enzyme, but also with intact L1210 cells. All these activities of (-)BO-2367 were more than 2-fold stronger than those of VP-16. Intriguingly, (+)BO-2367, which has an enantiomeric substituent at the C7 position of (-)BO-2367, did not affect the activity of the mammalian topoisomerase II, while it inhibited E. coli gyrase. Intraperitoneal injection of (-)BO-2367 at 0.08 mg/kg increased the lifespan of CDF1 female mice bearing ascitic L1210 leukemia by 2.4 times, and subcutaneous injection at 1.25 mg/kg completely inhibited the growth of colon 26 carcinoma implanted subcutaneously. These results suggest that (-)BO-2367 is a potent antitumor agent which targets topoisomerase II. These enantiomers should be a useful tool for studying drug-topoisomerase II interactions.
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Affiliation(s)
- T Yoshinari
- Banyu Tsukuba Research Institute in Collaboration with Merck Research Laboratories, Tsukuba
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16
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Ogata M, Fujisawa K, Ogino Y, Mano E. Partition coefficients as a measure of bioconcentration potential of crude oil compounds in fish and shellfish. Bull Environ Contam Toxicol 1984; 33:561-567. [PMID: 6498361 DOI: 10.1007/bf01625584] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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17
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Ogata M, Mano E. Analysis of serum and urinary beta 2-microglobulin in Japanese subjects. Ind Health 1984; 22:1-9. [PMID: 6373683 DOI: 10.2486/indhealth.22.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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