801
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Tian Z, Wen J, Ma J. Dynamic simulations of stimuli-responsive switching of azobenzene derivatives in self-assembled monolayers: reactive rotation potential and switching functions. MOLECULAR SIMULATION 2014. [DOI: 10.1080/08927022.2014.918974] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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802
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Kumar KRS, Kamei T, Fukaminato T, Tamaoki N. Complete ON/OFF photoswitching of the motility of a nanobiomolecular machine. ACS NANO 2014; 8:4157-65. [PMID: 24680285 DOI: 10.1021/nn5010342] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
To apply motor proteins as natural nanomolecular machines to transporting systems in nanotechnology, complete temporal control over ON/OFF switching of the motility is necessary. We have studied the photoresponsive inhibition properties of azobenzene-tethered peptides for regulation of kinesin-microtubule motility. Although a compound containing a peptide having an amino acid sequence derived from the kinesin's C-terminus (a known inhibitor of kinesin's motor domain) and also featuring a terminal azobenzene unit exhibited an inhibition effect, the phototunability of this behavior upon irradiation with UV or visible light was only moderate. Unexpectedly, newly synthesized peptides featuring the reverse sequence of amino acids of the C-terminus of kinesin exhibited excellent photoresponsive inhibition. In particular, azobenzene-CONH-IPKAIQASHGR completely stopped and started the motility of kinesin-microtubules in its trans- and cis-rich states, respectively, obtained after irradiation with visible and UV light, respectively. A gliding motility system containing this photoresponsive inhibitor allowed in situ control of the motion of microtubules on a kinesin-coated glass substrate. It is expected that the present results on the photoresponsive nanomotor system open up new opportunities to design nanotransportation systems.
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Affiliation(s)
- K R Sunil Kumar
- Research Institute for Electronic Science, Hokkaido University , N20, W10, Kita-Ku, Sapporo, Hokkaido 001-0020, Japan
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803
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Szymański W, Velema WA, Feringa BL. Photocaging of Carboxylic Acids: A Modular Approach. Angew Chem Int Ed Engl 2014; 53:8682-6. [DOI: 10.1002/anie.201402665] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 04/05/2014] [Indexed: 11/12/2022]
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804
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Szymański W, Velema WA, Feringa BL. Photocaging of Carboxylic Acids: A Modular Approach. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402665] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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805
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Hoppmann C, Lacey VK, Louie GV, Wei J, Noel JP, Wang L. Genetically encoding photoswitchable click amino acids in Escherichia coli and mammalian cells. Angew Chem Int Ed Engl 2014; 53:3932-6. [PMID: 24615769 PMCID: PMC4051619 DOI: 10.1002/anie.201400001] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 01/27/2014] [Indexed: 01/31/2023]
Abstract
The ability to reversibly control protein structure and function with light would offer high spatiotemporal resolution for investigating biological processes. To confer photoresponsiveness on general proteins, we genetically incorporated a set of photoswitchable click amino acids (PSCaas), which contain both a reversible photoswitch and an additional click functional group for further modifications. Orthogonal tRNA-synthetases were evolved to genetically encode PSCaas bearing azobenzene with an alkene, keto, or benzyl chloride group in E. coli and in mammalian cells. After incorporation into calmodulin, the benzyl chloride PSCaa spontaneously generated a covalent protein bridge by reacting with a nearby cysteine residue through proximity-enabled bioreactivity. The resultant azobenzene bridge isomerized in response to light, thereby changing the conformation of calmodulin. These genetically encodable PSCaas will prove valuable for engineering photoswitchable bridges into proteins for reversible optogenetic regulation.
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Affiliation(s)
- Christian Hoppmann
- Chemical Biology and Proteomics Laboratory The Salk Institute for Biological Studies 10010 N. Torrey Pines Road, La Jolla, CA 92037 (USA)
| | - Vanessa K. Lacey
- Chemical Biology and Proteomics Laboratory The Salk Institute for Biological Studies 10010 N. Torrey Pines Road, La Jolla, CA 92037 (USA)
| | - Gordon V. Louie
- Chemical Biology and Proteomics Laboratory The Salk Institute for Biological Studies 10010 N. Torrey Pines Road, La Jolla, CA 92037 (USA)
| | - Jing Wei
- Jadebio, Inc., La Jolla, CA 92037 (USA)
| | - Joseph P. Noel
- Chemical Biology and Proteomics Laboratory The Salk Institute for Biological Studies 10010 N. Torrey Pines Road, La Jolla, CA 92037 (USA)
- Howard Hughes Medical Institute
| | - Lei Wang
- Chemical Biology and Proteomics Laboratory The Salk Institute for Biological Studies 10010 N. Torrey Pines Road, La Jolla, CA 92037 (USA)
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806
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Shirinian VZ, Lvov AG, Krayushkin MM, Lubuzh ED, Nabatov BV. Synthesis and Comparative Photoswitching Studies of Unsymmetrical 2,3-Diarylcyclopent-2-en-1-ones. J Org Chem 2014; 79:3440-51. [DOI: 10.1021/jo500177k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Valerii Z. Shirinian
- N.
D. Zelinsky Institute of Organic Chemistry, RAS, 47 Leninsky prospekt, 119991 Moscow, Russian Federation
| | - Andrey G. Lvov
- N.
D. Zelinsky Institute of Organic Chemistry, RAS, 47 Leninsky prospekt, 119991 Moscow, Russian Federation
| | - Mikhail M. Krayushkin
- N.
D. Zelinsky Institute of Organic Chemistry, RAS, 47 Leninsky prospekt, 119991 Moscow, Russian Federation
| | - Elena D. Lubuzh
- N.
D. Zelinsky Institute of Organic Chemistry, RAS, 47 Leninsky prospekt, 119991 Moscow, Russian Federation
| | - Boris V. Nabatov
- A.
V. Shubnikov Institute of Crystallography, RAS, 59 Leninsky prospekt, 119333 Moscow, Russian Federation
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807
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Li W, Jiao C, Li X, Xie Y, Nakatani K, Tian H, Zhu W. Separation of Photoactive Conformers Based on Hindered Diarylethenes: Efficient Modulation in Photocyclization Quantum Yields. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310438] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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808
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Li W, Jiao C, Li X, Xie Y, Nakatani K, Tian H, Zhu W. Separation of Photoactive Conformers Based on Hindered Diarylethenes: Efficient Modulation in Photocyclization Quantum Yields. Angew Chem Int Ed Engl 2014; 53:4603-7. [DOI: 10.1002/anie.201310438] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 02/19/2014] [Indexed: 11/10/2022]
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809
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Hoppmann C, Lacey VK, Louie GV, Wei J, Noel JP, Wang L. Genetically Encoding Photoswitchable Click Amino Acids inEscherichia coliand Mammalian Cells. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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810
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Chiu CY, Wang H, Brunetti FG, Wudl F, Hawker CJ. Twisted but Conjugated: Building Blocks for Low Bandgap Polymers. Angew Chem Int Ed Engl 2014; 53:3996-4000. [DOI: 10.1002/anie.201400674] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Indexed: 11/07/2022]
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811
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812
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Chen KY, Ivashenko O, Carroll GT, Robertus J, Kistemaker JCM, London G, Browne WR, Rudolf P, Feringa BL. Control of Surface Wettability Using Tripodal Light-Activated Molecular Motors. J Am Chem Soc 2014; 136:3219-24. [DOI: 10.1021/ja412110t] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Kuang-Yen Chen
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Oleksii Ivashenko
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Gregory T. Carroll
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Jort Robertus
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Jos C. M. Kistemaker
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Gábor London
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Wesley R. Browne
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Petra Rudolf
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Ben L. Feringa
- Centre
for Systems Chemistry,
Stratingh Institute for Chemistry and Zernike Institute for Advanced
Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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813
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Strueben J, Gates PJ, Staubitz A. Tin-functionalized azobenzenes as nucleophiles in Stille cross-coupling reactions. J Org Chem 2014; 79:1719-28. [PMID: 24502513 DOI: 10.1021/jo402598u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The metalation of azobenzene by halogen-metal exchange typically leads to a reduction of the azo group to give hydrazine derivatives as major byproducts, instead of the desired metalated azobenzene species. In cross-coupling reactions, azobenzenes therefore usually serve as electrophiles, which greatly limits the scope of the reaction. To solve this problem, we have developed a mild and fast method to stannylate azobenzenes in high yields. This research shows that these stannylated azobenzenes can be used as nucleophilic components in Stille cross-coupling reactions with aryl bromides. The cross-coupling products were obtained in high yields ranging from 70 to 93%. With this reversal of the nucleophilic and electrophilic components, cross-coupling products are now accessible in which the aromatic rings coupled to the azobenzene bear functional groups that are sensitive to metalation.
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Affiliation(s)
- Jan Strueben
- Otto-Diels-Institute for Organic Chemistry, University of Kiel , Otto-Hahn-Platz 4, 24098 Kiel, Germany
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814
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Velema WA, Szymanski W, Feringa BL. Photopharmacology: Beyond Proof of Principle. J Am Chem Soc 2014; 136:2178-91. [DOI: 10.1021/ja413063e] [Citation(s) in RCA: 712] [Impact Index Per Article: 71.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Willem A. Velema
- Center for Systems Chemistry,
Stratingh Institute for Chemistry, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
| | - Wiktor Szymanski
- Center for Systems Chemistry,
Stratingh Institute for Chemistry, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
| | - Ben L. Feringa
- Center for Systems Chemistry,
Stratingh Institute for Chemistry, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
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815
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Li K, Xiang Y, Wang X, Li J, Hu R, Tong A, Tang BZ. Reversible Photochromic System Based on Rhodamine B Salicylaldehyde Hydrazone Metal Complex. J Am Chem Soc 2014; 136:1643-9. [DOI: 10.1021/ja411689w] [Citation(s) in RCA: 178] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Kai Li
- Department
of Chemistry, Beijing Key Laboratory for Microanalytical Methods and
Instrumentation, Key Laboratory of Bioorganic Phosphorus Chemistry
and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Yu Xiang
- Department
of Chemistry, Beijing Key Laboratory for Microanalytical Methods and
Instrumentation, Key Laboratory of Bioorganic Phosphorus Chemistry
and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Xiaoyan Wang
- Department
of Chemistry, Beijing Key Laboratory for Microanalytical Methods and
Instrumentation, Key Laboratory of Bioorganic Phosphorus Chemistry
and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Ji Li
- Department
of Chemistry, Beijing Key Laboratory for Microanalytical Methods and
Instrumentation, Key Laboratory of Bioorganic Phosphorus Chemistry
and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Rongrong Hu
- Department of Chemistry, State Key Laboratory of Molecular Neuroscience, Institute of Molecular Functional Materials, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Aijun Tong
- Department
of Chemistry, Beijing Key Laboratory for Microanalytical Methods and
Instrumentation, Key Laboratory of Bioorganic Phosphorus Chemistry
and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China
| | - Ben Zhong Tang
- Department of Chemistry, State Key Laboratory of Molecular Neuroscience, Institute of Molecular Functional Materials, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China
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816
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Poloni C, Szymański W, Hou L, Browne WR, Feringa BL. A Fast, Visible-Light-Sensitive Azobenzene for Bioorthogonal Ligation. Chemistry 2014; 20:946-51. [DOI: 10.1002/chem.201304129] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Indexed: 12/22/2022]
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817
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Abstract
Optical probing and manipulation of cellular signaling has revolutionized biological studies ranging from isolated cells to intact tissues in the live animal. A promising avenue of optical manipulation is Chemical Optogenetics (or Optogenetic Pharmacology), an approach for engineering specific proteins to be rapidly and reversibly switched on and off with light. The approach employs synthetic photoswitched ligands, which can be reversibly photo-isomerized to toggle back and forth between two conformations in response to two wavelengths of light. We focus here on the photoswitched tethered ligand (PTL) approach in which the PTL is covalently attached in a site-directed manner to a signaling protein. For this a ligand anchoring site is introduced at a location which allows the ligand to dock only in one of the light-controlled conformations, thus enabling liganding to be rapidly switched. The ligand can be an agonist, antagonist or an active site (or pore) blocker. In principle, orthogonal chemistries of attachment would make PTL anchoring completely unique. However, extremely high specificity of remote control is also obtained by cysteine attachment because of the ligand specificity and precise geometric requirements for liganding. We describe here the design of light-gated ionotropic and metabotropic glutamate receptors, the selection of a site for cysteine placement, the method for PTL attachment, and a detailed protocol of photoswitching experiments in cultured cells. These descriptions can guide applications of Chemical Optogenetics to other receptors and serve as a starting point for use in more complex preparations.
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Affiliation(s)
- Andreas Reiner
- Department of Molecular and Cell Biology and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, 94720, USA
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818
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Bautista-Barrufet A, Izquierdo-Serra M, Gorostiza P. Photoswitchable Ion Channels and Receptors. NOVEL APPROACHES FOR SINGLE MOLECULE ACTIVATION AND DETECTION 2014. [DOI: 10.1007/978-3-662-43367-6_9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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819
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Niu Y, Li Y, Lu Y, Xu W. Spiropyran-decorated light-responsive amphiphilic poly(α-hydroxy acids) micelles constructed via a CuAAC reaction. RSC Adv 2014. [DOI: 10.1039/c4ra11550c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Light-responsive amphiphilic poly(α-hydroxy acids) with pendent spiropyran chromophore was synthesized and the resultant micelles assembled in aqueous solution presented excellent light-response.
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Affiliation(s)
- Yile Niu
- Institute of Polymer Science and Engineering
- College of Chemistry & Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Yefei Li
- Institute of Polymer Science and Engineering
- College of Chemistry & Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Yanbing Lu
- Institute of Polymer Science and Engineering
- College of Chemistry & Chemical Engineering
- Hunan University
- Changsha 410082, China
| | - Weijian Xu
- Institute of Polymer Science and Engineering
- College of Chemistry & Chemical Engineering
- Hunan University
- Changsha 410082, China
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820
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Falenczyk C, Schiedel M, Karaman B, Rumpf T, Kuzmanovic N, Grøtli M, Sippl W, Jung M, König B. Chromo-pharmacophores: photochromic diarylmaleimide inhibitors for sirtuins. Chem Sci 2014. [DOI: 10.1039/c4sc01346h] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Controlling the activity of sirtuins is of high biomedical relevance as the enzymes are involved in cancer, neurodegeneration and other diseases.
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Affiliation(s)
- C. Falenczyk
- Institute of Organic Chemistry
- University of Regensburg
- 93040 Regensburg, Germany
| | - M. Schiedel
- Institute of Pharmaceutical Sciences
- University of Freiburg
- 79104 Freiburg, Germany
| | - B. Karaman
- Department of Pharmaceutical Chemistry
- Martin Luther University of Halle Wittenberg
- 06120 Halle/Saale, Germany
| | - T. Rumpf
- Institute of Pharmaceutical Sciences
- University of Freiburg
- 79104 Freiburg, Germany
| | - N. Kuzmanovic
- Institute of Organic Chemistry
- University of Regensburg
- 93040 Regensburg, Germany
| | - M. Grøtli
- Department of Chemistry and Molecular Biology
- University of Gothenburg
- 41296 Göteborg, Sweden
| | - W. Sippl
- Department of Pharmaceutical Chemistry
- Martin Luther University of Halle Wittenberg
- 06120 Halle/Saale, Germany
| | - M. Jung
- Institute of Pharmaceutical Sciences
- University of Freiburg
- 79104 Freiburg, Germany
| | - B. König
- Institute of Organic Chemistry
- University of Regensburg
- 93040 Regensburg, Germany
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821
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Muller BM, Mai J, Yocum RA, Adler MJ. Impact of mono- and disubstitution on the colorimetric dynamic covalent switching chalcone/flavanone scaffold. Org Biomol Chem 2014; 12:5108-14. [DOI: 10.1039/c4ob00398e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The impact of substitution on a novel colorimetric dynamic covalent switching scaffold was investigated using UV/Vis and NMR spectroscopy.
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Affiliation(s)
- Brian M. Muller
- Department of Chemistry & Biochemistry
- Northern Illinois University
- DeKalb, USA
| | - Jesse Mai
- Department of Chemistry & Biochemistry
- Northern Illinois University
- DeKalb, USA
| | - Reid A. Yocum
- Department of Chemistry & Biochemistry
- Northern Illinois University
- DeKalb, USA
| | - Marc J. Adler
- Department of Chemistry & Biochemistry
- Northern Illinois University
- DeKalb, USA
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822
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Poloni C, Szymanski W, Feringa BL. Photo-controlled deactivation of immobilised lipase. Chem Commun (Camb) 2014; 50:12645-8. [DOI: 10.1039/c4cc06087c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Immobilization of lipase on a quartz surface using a photoswitchable linker permits to control the deactivation of the enzyme by irradiation with light.
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Affiliation(s)
- Claudia Poloni
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- Faculty of Mathematics and Natural Sciences
- University of Groningen
- 9747 AG Groningen, The Netherlands
| | - Wiktor Szymanski
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- Faculty of Mathematics and Natural Sciences
- University of Groningen
- 9747 AG Groningen, The Netherlands
| | - Ben L. Feringa
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- Faculty of Mathematics and Natural Sciences
- University of Groningen
- 9747 AG Groningen, The Netherlands
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823
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Li M, Zhang L, Tao M, Cheng Z, Zhu X. Living cationic polymerization of bisazobenzene-containing vinyl ether and synthesis of a graft copolymer by combination with ATRP. Polym Chem 2014. [DOI: 10.1039/c4py00162a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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824
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Mohamed MG, Su WC, Lin YC, Wang CF, Chen JK, Jeong KU, Kuo SW. Azopyridine-functionalized benzoxazine with Zn(ClO4)2form high-performance polybenzoxazine stabilized through metal–ligand coordination. RSC Adv 2014. [DOI: 10.1039/c4ra08381d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Azopyridine-functionalized benzoxazine (PBZ) was prepared and then blended with zinc ion through metal–ligand coordination to form a high performance polybenzoxazine after thermal curing.
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Affiliation(s)
- Mohamed Gamal Mohamed
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
| | - Wei-Chen Su
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
| | - Yung-Chih Lin
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
| | - Chih-Feng Wang
- Department of Materials Science and Engineering
- I-Shou University
- Kaohsiung, Taiwan
| | - Jem-Kun Chen
- Department of Polymer-Nano Science and Technology
- Chonbuk National University
- Jeonju, Korea
| | - Kwang-Un Jeong
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taiwan
| | - Shiao-Wei Kuo
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung, Taiwan
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University
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825
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Samanta S, Babalhavaeji A, Dong MX, Woolley GA. Photoswitching of ortho-substituted azonium ions by red light in whole blood. Angew Chem Int Ed Engl 2013; 52:14127-30. [PMID: 24214131 PMCID: PMC3883038 DOI: 10.1002/anie.201306352] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2013] [Indexed: 11/07/2022]
Affiliation(s)
| | | | | | - G. Andrew Woolley
- Dept. of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
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826
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Abstract
The powerful optogenetic pharmacology method allows the optical control of neuronal activity by photoswitchable ligands tethered to channels and receptors. However, this approach is technically demanding, as it requires the design of pharmacologically active ligands. The development of versatile technologies therefore represents a challenging issue. Here, we present optogating, a method in which the gating machinery of an ATP-activated P2X channel was reprogrammed to respond to light. We found that channels covalently modified by azobenzene-containing reagents at the transmembrane segments could be reversibly turned on and off by light, without the need of ATP, thus revealing an agonist-independent, light-induced gating mechanism. We demonstrate photocontrol of neuronal activity by a light-gated, ATP-insensitive P2X receptor, providing an original tool devoid of endogenous sensitivity to delineate P2X signaling in normal and pathological states. These findings open new avenues to specifically activate other ion channels independently of their natural stimulus.
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827
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Kienzler MA, Reiner A, Trautman E, Yoo S, Trauner D, Isacoff EY. A red-shifted, fast-relaxing azobenzene photoswitch for visible light control of an ionotropic glutamate receptor. J Am Chem Soc 2013; 135:17683-6. [PMID: 24171511 PMCID: PMC3990231 DOI: 10.1021/ja408104w] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The use of azobenzene photoswitches has become a dependable method for rapid and exact modulation of biological processes and material science systems. The requirement of ultraviolet light for azobenzene isomerization is not ideal for biological systems due to poor tissue penetration and potentially damaging effects. While modified azobenzene cores with a red-shifted cis-to-trans isomerization have been previously described, they have not yet been incorporated into a powerful method to control protein function: the photoswitchable tethered ligand (PTL) approach. We report the synthesis and characterization of a red-shifted PTL, L-MAG0460, for the light-gated ionotropic glutamate receptor LiGluR. In cultured mammalian cells, the LiGluR+L-MAG0460 system is activated rapidly by illumination with 400-520 nm light to generate a large ionic current. The current rapidly turns off in the dark as the PTL relaxes thermally back to the trans configuration. The visible light excitation and single-wavelength behavior considerably simplify use and should improve utilization in tissue.
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Affiliation(s)
- Michael A. Kienzler
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
- Department of Chemistry and Center for Integrated Protein Science, Ludwig-Maximilians-Universität, Butenandtstraße 5-13, Munich 81377, Germany
| | - Andreas Reiner
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
| | - Eric Trautman
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
| | - Stan Yoo
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
| | - Dirk Trauner
- Department of Chemistry and Center for Integrated Protein Science, Ludwig-Maximilians-Universität, Butenandtstraße 5-13, Munich 81377, Germany
| | - Ehud Y. Isacoff
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
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828
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Reisinger B, Kuzmanovic N, Löffler P, Merkl R, König B, Sterner R. Nutzung natürlicher Proteinsymmetrie zum Design lichtschaltbarer Enzyminhibitoren. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307207] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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829
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Reisinger B, Kuzmanovic N, Löffler P, Merkl R, König B, Sterner R. Exploiting protein symmetry to design light-controllable enzyme inhibitors. Angew Chem Int Ed Engl 2013; 53:595-8. [PMID: 24520030 DOI: 10.1002/anie.201307207] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Indexed: 11/07/2022]
Abstract
The activity of the metabolic branch-point enzyme PriA from Mycobacterium tuberculosis (mtPriA) can be controlled reversibly by light. Two-pronged inhibitors based on the dithienylethene scaffold were designed utilizing mtPriA's natural rotational symmetry. Switching from the flexible, ring-open to the rigid, ring-closed isomer reduces inhibition activity by one order of magnitude.
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Affiliation(s)
- Bernd Reisinger
- Institut für Biophysik und physikalische Biochemie, Universität Regensburg, 93040 Regensburg (Germany)
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830
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Samanta S, Babalhavaeji A, Dong MX, Woolley GA. Photoswitching ofortho-Substituted Azonium Ions by Red Light in Whole Blood. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201306352] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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831
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Rodrigues-Correia A, Weyel XMM, Heckel A. Four levels of wavelength-selective uncaging for oligonucleotides. Org Lett 2013; 15:5500-3. [PMID: 24111849 DOI: 10.1021/ol402657j] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
In this study the new nucleobase-caged nucleotides dT(NpHP) and dT(DEACM) are introduced. Together with two other caging groups (NDBF and NPP) this results in four layers of wavelength-selective uncaging for oligonucleotides, sequentially going from 505 to 440 nm, 365 nm, and finally to 313 nm for the photolysis reaction.
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Affiliation(s)
- Alexandre Rodrigues-Correia
- Institute for Organic Chemistry and Chemical Biology, Buchmann Institute for Molecular Life Sciences, Goethe-University Frankfurt , Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
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832
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Abstract
Bacterial resistance is a major problem in the modern world, stemming in part from the build-up of antibiotics in the environment. Novel molecular approaches that enable an externally triggered increase in antibiotic activity with high spatiotemporal resolution and auto-inactivation are highly desirable. Here we report a responsive, broad-spectrum, antibacterial agent that can be temporally activated with light, whereupon it auto-inactivates on the scale of hours. The use of such a 'smart' antibiotic might prevent the build-up of active antimicrobial material in the environment. Reversible optical control over active drug concentration enables us to obtain pharmacodynamic information. Precisely localized control of activity is achieved, allowing the growth of bacteria to be confined to defined patterns, which has potential for the development of treatments that avoid interference with the endogenous microbial population in other parts of the organism.
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833
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Velema WA, van der Toorn M, Szymanski W, Feringa BL. Design, Synthesis, and Inhibitory Activity of Potent, Photoswitchable Mast Cell Activation Inhibitors. J Med Chem 2013; 56:4456-64. [DOI: 10.1021/jm400115k] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Willem A. Velema
- Centre for Systems Chemistry,
Stratingh Institute for Chemistry, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
| | - Marco van der Toorn
- Laboratory of Allergology and
Pulmonary Diseases, Department of Pathology and Medical Biology, University
Medical Centre Groningen, 9713 GZ Groningen, The Netherlands
| | - Wiktor Szymanski
- Centre for Systems Chemistry,
Stratingh Institute for Chemistry, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
| | - Ben L. Feringa
- Centre for Systems Chemistry,
Stratingh Institute for Chemistry, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
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