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Pavlović RZ, Lalisse RF, Hansen AL, Waudby CA, Lei Z, Güney M, Wang X, Hadad CM, Badjić JD. From Selection to Instruction and Back: Competing Conformational Selection and Induced Fit Pathways in Abiotic Hosts. Angew Chem Int Ed Engl 2021; 60:19942-19948. [PMID: 34125989 DOI: 10.1002/anie.202107091] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Indexed: 12/15/2022]
Abstract
Two limiting cases of molecular recognition, induced fit (IF) and conformational selection (CS), play a central role in allosteric regulation of natural systems. The IF paradigm states that a substrate "instructs" the host to change its shape after complexation, while CS asserts that a guest "selects" the optimal fit from an ensemble of preexisting host conformations. With no studies that quantitatively address the interplay of two limiting pathways in abiotic systems, we herein and for the first time describe the way by which twisted capsule M-1, encompassing two conformers M-1(+) and M-1(-), trap CX4 (X=Cl, Br) to give CX4 ⊂M-1(+) and CX4 ⊂M-1(-), with all four states being in thermal equilibrium. With the assistance of 2D EXSY, we found that CBr4 would, at its lower concentrations, bind M-1 via a M-1(+)→M-1(-)→CBr4 ⊂M-1(-) pathway corresponding to conformational selection. For M-1 complexing CCl4 though, data from 2D EXSY measurements and 1D NMR line-shape analysis suggested that lower CCl4 concentrations would favor CS while the IF pathway prevailed at higher proportions of the guest. Since CS and IF are not mutually exclusive, we reason that our work sets the stage for characterizing the dynamics of a wide range of already existing hosts to broaden our fundamental understanding of their action. The objective is to master the way in which encapsulation takes place for designing novel and allosteric sequestering agents, catalysts and chemosensors akin to those found in nature.
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Affiliation(s)
- Radoslav Z Pavlović
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
| | - Remy F Lalisse
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
| | - Alexandar L Hansen
- Campus Chemical Instrument Center, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
| | - Christopher A Waudby
- Institute of Structural and Molecular Biology, University College London, London, WC1E 6BT, UK
| | - Zhiquan Lei
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
| | - Murat Güney
- Agri Ibrahim Çeçen University, Department of Chemistry, 04100, Agri, Turkey
| | - Xiuze Wang
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
| | - Christopher M Hadad
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
| | - Jovica D Badjić
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH, 43210, USA
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Pavlović RZ, Lalisse RF, Hansen AL, Waudby CA, Lei Z, Güney M, Wang X, Hadad CM, Badjić JD. From Selection to Instruction and Back: Competing Conformational Selection and Induced Fit Pathways in Abiotic Hosts. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107091] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Radoslav Z. Pavlović
- Department of Chemistry & Biochemistry The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
| | - Remy F. Lalisse
- Department of Chemistry & Biochemistry The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
| | - Alexandar L. Hansen
- Campus Chemical Instrument Center The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
| | - Christopher A. Waudby
- Institute of Structural and Molecular Biology University College London London WC1E 6BT UK
| | - Zhiquan Lei
- Department of Chemistry & Biochemistry The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
| | - Murat Güney
- Agri Ibrahim Çeçen University Department of Chemistry 04100 Agri Turkey
| | - Xiuze Wang
- Department of Chemistry & Biochemistry The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
| | - Christopher M. Hadad
- Department of Chemistry & Biochemistry The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
| | - Jovica D. Badjić
- Department of Chemistry & Biochemistry The Ohio State University 100 West 18th Avenue Columbus OH 43210 USA
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103
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Goswami A, Özer MS, Paul I, Schmittel M. Evolution of catalytic machinery: three-component nanorotor catalyzes formation of four-component catalytic machinery. Chem Commun (Camb) 2021; 57:7180-7183. [PMID: 34190276 DOI: 10.1039/d1cc02805g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The three-component nanorotor [Cu2(S)(R)]2+ (k298 = 46.0 kHz) that is a catalyst for a CuAAC reaction binds the click product at each of its copper centers thereby creating a new platform and a dynamic slider-on-deck system. Due to this sliding motion (k298 = 65.0 kHz) the zinc-porphyrin bound N-methylpyrrolidine is efficiently released into solution and catalyzes a follow-up Michael addition.
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Affiliation(s)
- Abir Goswami
- Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Str. 2, Siegen D-57068, Germany.
| | - Merve S Özer
- Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Str. 2, Siegen D-57068, Germany.
| | - Indrajit Paul
- Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Str. 2, Siegen D-57068, Germany.
| | - Michael Schmittel
- Center of Micro and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Str. 2, Siegen D-57068, Germany.
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104
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Russell MJ. The "Water Problem"( sic), the Illusory Pond and Life's Submarine Emergence-A Review. Life (Basel) 2021; 11:429. [PMID: 34068713 PMCID: PMC8151828 DOI: 10.3390/life11050429] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 04/30/2021] [Accepted: 05/01/2021] [Indexed: 01/10/2023] Open
Abstract
The assumption that there was a "water problem" at the emergence of life-that the Hadean Ocean was simply too wet and salty for life to have emerged in it-is here subjected to geological and experimental reality checks. The "warm little pond" that would take the place of the submarine alkaline vent theory (AVT), as recently extolled in the journal Nature, flies in the face of decades of geological, microbiological and evolutionary research and reasoning. To the present author, the evidence refuting the warm little pond scheme is overwhelming given the facts that (i) the early Earth was a water world, (ii) its all-enveloping ocean was never less than 4 km deep, (iii) there were no figurative "Icelands" or "Hawaiis", nor even an "Ontong Java" then because (iv) the solidifying magma ocean beneath was still too mushy to support such salient loadings on the oceanic crust. In place of the supposed warm little pond, we offer a well-protected mineral mound precipitated at a submarine alkaline vent as life's womb: in place of lipid membranes, we suggest peptides; we replace poisonous cyanide with ammonium and hydrazine; instead of deleterious radiation we have the appropriate life-giving redox and pH disequilibria; and in place of messy chemistry we offer the potential for life's emergence from the simplest of geochemically available molecules and ions focused at a submarine alkaline vent in the Hadean-specifically within the nano-confined flexible and redox active interlayer walls of the mixed-valent double layer oxyhydroxide mineral, fougerite/green rust comprising much of that mound.
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Affiliation(s)
- Michael J Russell
- Dipartimento di Chimica, Università degli Studi di Torino, via P. Giuria 7, 10125 Turin, Italy
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Abramov PA, Novikov AS, Sokolov MN. Interactions of aromatic rings in the crystal structures of hybrid polyoxometalates and Ru clusters. CrystEngComm 2021. [DOI: 10.1039/d1ce00716e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Computational analysis for π–π interaction energies of {(arene)Ru}2+ containing complexes and relative group 5 hybrid polyoxometalates reveals different frameworks. Some perspectives on πOF materials processing and crystal engineering were discussed.
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Affiliation(s)
- Pavel A. Abramov
- Nikolaev Institute of Inorganic Chemistry, 3 Akad. Lavrentiev Ave., 630090, Russia
| | - Alexander S. Novikov
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab., 7/9, Saint Petersburg, Russia
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry, 3 Akad. Lavrentiev Ave., 630090, Russia
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