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Shimon L, di Gregoria MC, Houben L, Lahav M, van der Boom M. Highly versatile metal–organic frameworks. Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s2053273319090971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Diskin-Posner Y, Shimon L, Samanta D, Hanopolskyi A, Klajn R. Molecular switches in nanocontainers. Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s2053273319090740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Livnah O, Shimon L. Felix Frolow (1947-2014). Acta Crystallogr F Struct Biol Commun 2014; 70:1443-4. [PMID: 25286959 PMCID: PMC4188099 DOI: 10.1107/s2053230x14020949] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Obituary for Felix Frolow.
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Affiliation(s)
- Oded Livnah
- Department of Biological Chemistry, The Institute of Life Sciences, and The Wolfson Centre for Applied Structural Biology, The Hebrew University, Jerusalem 91904, Israel
| | - Linda Shimon
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
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Goihberg E, Peretz M, Tel-Or S, Dym O, Shimon L, Frolow F, Burstein Y. Biochemical and Structural Properties of Chimeras Constructed by Exchange of Cofactor-Binding Domains in Alcohol Dehydrogenases from Thermophilic and Mesophilic Microorganisms. Biochemistry 2010; 49:1943-53. [DOI: 10.1021/bi901730x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | | | | | - Orly Dym
- Department of Structural Biology and Israel Structural Proteomics Center
| | | | - Felix Frolow
- Department of Molecular Microbiology and Biotechnology, The George S. Wise Faculty of Life Sciences and the Daniella Rich Institute for Structural Biology, Tel-Aviv University, Ramat Aviv 69978, Israel
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Goihberg E, Dym O, Tel-Or S, Shimon L, Frolow F, Peretz M, Burstein Y. Thermal stabilization of the protozoan Entamoeba histolytica alcohol dehydrogenase by a single proline substitution. Proteins 2008; 72:711-9. [PMID: 18260103 DOI: 10.1002/prot.21946] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Analysis of the three-dimensional structures of two closely related thermophilic and hyperthermophilic alcohol dehydrogenases (ADHs) from the respective microorganisms Entamoeba histolytica (EhADH1) and Thermoanaerobacter brockii (TbADH) suggested that a unique, strategically located proline residue (Pro275) at the center of the dimerization interface might be crucial for maintaining the thermal stability of TbADH. To assess the contribution of Pro275 to the thermal stability of the ADHs, we applied site-directed mutagenesis to replace Asp275 of EhADH1 with Pro (D275P-EhADH1) and conversely Pro275 of TbADH with Asp (P275D-TbADH). The results indicate that replacing Asp275 with Pro significantly enhances the thermal stability of EhADH1 (DeltaT(1/2) <or= +10 degrees C), whereas the reverse mutation in the thermophilic TbADH (P275D-TbADH) reduces the thermostability of the enzyme (DeltaT(1/2) <or= -18.8 degrees C). Analysis of the crystal structures of the thermostabilized mutant D275P-EhADH1 and the thermocompromised mutant P275D-TbADH suggest that a proline residue at position 275 thermostabilized the enzymes by reducing flexibility and by reinforcing hydrophobic interactions at the dimer-dimer interface of the tetrameric ADHs.
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Affiliation(s)
- Edi Goihberg
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel
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Abstract
In this work, we present a complete and detailed experimental characterization and theoretical study of a variety of coordinated S-nitrosothiols (RSNOs), such as cysteine derivatives, mercaptosuccinic acid, benzyl thiol, and phenyl thiol. Some of them are extremely unstable and sensitive in free form. Strikingly, in contrast with free S-nitrosothiols, we found that, upon coordination to iridium, they become very stable even in aqueous solutions. The study of these coordinated complexes provides further insight on the elucidation of structural aspects dealing with the nature of the S-N bond in RSNOs, a fact which still remains a matter of controversy.
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Affiliation(s)
- Laura L Perissinotti
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, (C1428EHA) Buenos Aires, Argentina
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Jindou S, Petkun S, Shimon L, Bayer EA, Lamed R, Frolow F. Crystallization and preliminary diffraction studies of CBM3b of cellobiohydrolase 9A from Clostridium thermocellum. Acta Crystallogr Sect F Struct Biol Cryst Commun 2007; 63:1044-7. [PMID: 18084089 DOI: 10.1107/s1744309107054644] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2007] [Accepted: 10/30/2007] [Indexed: 11/10/2022]
Abstract
Family 3 carbohydrate-binding modules (CBM3s) are associated with the scaffoldin subunit of the multi-enzyme cellulosome complex and with the family 9 glycoside hydrolases, which are multimodular enzymes that act on plant cell-wall polysaccharides, notably cellulose. Here, the crystallization of CBM3b from cellobiohydrolase 9A is reported. The crystals are tetragonal and belong to space group P4(1) or P4(3). X-ray diffraction data for CBM3b have been collected to 2.68 A resolution on beamline ID14-4 at the ESRF.
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Affiliation(s)
- Sadanari Jindou
- Department of Molecular Microbiology and Biotechnology, Tel Aviv University 69978, Israel
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Di Salvo F, Escola N, Scherlis DA, Estrin DA, Bondía C, Murgida D, Ramallo-López JM, Requejo FG, Shimon L, Doctorovich F. Electronic Perturbation in a Molecular Nanowire of [IrCl5(NO)]− Units. Chemistry 2007; 13:8428-36. [PMID: 17636465 DOI: 10.1002/chem.200601761] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [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: 11/09/2022]
Abstract
The nitrosyl in [IrCl5(NO)]- is probably the most electrophilic known to date. This fact is reflected by its extremely high IR frequency in the solid state, electrochemical behavior, and remarkable reactivity in solution. PPh4[IrCl5(NO)] forms a crystal in which the [IrCl5(NO)]- anions are in a curious wire-like linear arrangement, in which the distance between the N--O moiety of one anion and the trans chloride of the upper one nearby is only 2.8 A. For the same complex [IrCl5(NO)]- but with a different counterion, Na[IrCl5(NO)], the anions are stacked one over the other in a side-by-side arrangement. In this case the electronic distribution can be depicted as the closed-shell electronic structure Ir III-NO+, as expected for any d(6) third-row transition metal complex. However, in PPh4[IrCl5(NO)] an unprecedented electronic perturbation takes place, probably due to NO*-Cl- acceptor-donor interactions among a large number of [IrCl5(NO)]- units, favoring a different electronic distribution, namely the open-shell electronic structure Ir IV-NO*. This conclusion is based on XANES experimental evidence, which demonstrates that the formal oxidation state for iridium in PPh4[IrCl5(NO)] is +4, as compared with +3 in K[IrCl5(NO)]. In agreement, solid-state DFT calculations show that the ground state for [IrCl5(NO)]- in the PPh4+ salt comprises an open-shell singlet with an electronic structure which encompasses half of the spin density mainly localized on a metal-centered orbital, and the other half on an NO-based orbital. The electronic perturbation could be seen as an electron promotion from a metal-chloride to a metal-NO orbital, due to the small HOMO-LUMO gap in PPh4[IrCl5(NO)]. This is probably induced by electrostatic interactions acting as a result of the closeness and wire-like spatial arrangement of the Ir metal centers, imposed by lattice forces due to pi-pi stacking interactions among the phenyl rings in PPh4+. Experimental and theoretical data indicate that in PPh4[IrCl5(NO)] the Ir-N-O moiety is partially bent and tilted.
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Affiliation(s)
- Florencia Di Salvo
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina
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Doctorovich F, Di Salvo F, Escola N, Trápani C, Shimon L. Formation of Coordinated Nitrosamines by Reaction of K[IrCl5NO] with Primary Amines. Organometallics 2005. [DOI: 10.1021/om050457n] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fabio Doctorovich
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina, and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Florencia Di Salvo
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina, and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Natalia Escola
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina, and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Cecilia Trápani
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina, and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Linda Shimon
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 3, C1428EHA Buenos Aires, Argentina, and Department of Chemical Services, The Weizmann Institute of Science, Rehovot 76100, Israel
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Jacob D, Kahlenberg V, Wurst K, Solovyov L, Felner I, Shimon L, Gottlieb H, Gedanken A. Sonochemical Reaction of [Fe(CO)5] with 1-Methylimidazole in An Ionic Liquid: Formation of [(1-Methylimidazole)6FeII](PF6)2. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400711] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Band A, Albu-Yaron A, Livneh T, Cohen H, Feldman Y, Shimon L, Popovitz-Biro R, Lyahovitskaya V, Tenne R. Characterization of Oxides of Cesium. J Phys Chem B 2004. [DOI: 10.1021/jp036432o] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Band
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - A. Albu-Yaron
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - T. Livneh
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - H. Cohen
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Y. Feldman
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - L. Shimon
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - R. Popovitz-Biro
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - V. Lyahovitskaya
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
| | - R. Tenne
- Department of Materials and Interfaces and Chemical Services Unit, Weizmann Institute of Science, Rehovot 76100, Israel
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Bartfeld D, Shimon L, Couture GC, Rabinovich D, Frolow F, Levanon D, Groner Y, Shakked Z. DNA recognition by the RUNX1 transcription factor is mediated by an allosteric transition in the RUNT domain and by DNA bending. Structure 2002; 10:1395-407. [PMID: 12377125 DOI: 10.1016/s0969-2126(02)00853-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [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 Runt domain proteins are transcription regulators of major developmental pathways. Here we present the crystal structures of the Runt domain (RD) of the human protein RUNX1 and its DNA binding site in their free states and compare them with the published crystal structures of RD bound to DNA and to the partner protein CBFbeta. We demonstrate that (1) RD undergoes an allosteric transition upon DNA binding, which is further stabilized by CBFbeta, and that (2) the free DNA target adopts a bent-helical conformation compatible with that of the complex. These findings elucidate the mechanism by which CBFbeta enhances RD binding to DNA as well as the role of the intrinsic conformation of the DNA target in the recognition process.
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Affiliation(s)
- Deborah Bartfeld
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
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Sarkisian VA, Shimon L. [Spatial organization of vestibular effects on neurons of the fastigial nucleus in the cat]. Fiziol Zh SSSR Im I M Sechenova 1982; 68:768-75. [PMID: 7117595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Cerebellar fastigial neurons activated by stimulation of vestibular nerve and the lateral vestibular nucleus of Deiters, were studied in cats. Over 2/3 of the neurons synaptically activated by stimulation of vestibular nerve are localized in the caudal half of the fastigial nucleus. Over half of these fastigial neurons could be activated antidromically by stimulation of the contralateral Deiters nucleus. 81% of these neurons antidromically activated by stimulation of ventral region of the contralateral Deiters nucleus were distributed in the caudal half of the fastigial nucleus and the remaining 19%--in the rostral part of the nucleus. Bilateral stimulation of the dorsal part of Deiters' nucleus antidromically activated the fastigial neurons in medial and rostral regions of the nucleus. There was no fastigial neuronal projections to the ventral half of the ipsilateral Deiters' nucleus. Orthodromic action potentials could be produced by stimulation of the ipsilateral Deiters' nucleus in the neurons of rostral part of the fastigial nucleus.
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