Protein Self-Assembly Driven by De Novo Coiled Coils and Constructing Ag Nanoparticle-Protein Assembly Composite with High Catalytic Activity

2018 ◽  
Vol 35 (3) ◽  
pp. 1700436 ◽  
Author(s):  
Shanpeng Qiao ◽  
Ruidi Wang ◽  
Tengfei Yan ◽  
Xiumei Li ◽  
Linlu Zhao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Self Assembly ◽  
De Novo ◽  
Protein Assembly ◽  
Coiled Coils ◽  
High Catalytic Activity ◽  
Ag Nanoparticle

scholarly journals Symmetry-Directed Self-Assembly of a Tetrahedral Protein Cage Mediated by de Novo-Designed Coiled Coils

ChemBioChem ◽  
2017 ◽  
Vol 18 (19) ◽  
pp. 1888-1892 ◽  
Author(s):  
Somayesadat Badieyan ◽  
Aaron Sciore ◽  
Joseph D. Eschweiler ◽  
Philipp Koldewey ◽  
Ajitha S. Cristie-David ◽  
...  
Keyword(s):  
Self Assembly ◽  
De Novo ◽  
Coiled Coils ◽  
Protein Cage

Assembling Fe(III)-Citrate Complexes on Graphitic Carbon Nitride for Coupling Photocatalysis with Fenton Reaction

2014 ◽  
Vol 1010-1012 ◽  
pp. 185-189
Author(s):  
Xin Li ◽  
Jing Hai Liu ◽  
Baosharileaodou ◽  
Hen An Yang ◽  
Fei Huang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Self Assembly ◽  
Fenton Reaction ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
High Catalytic Activity ◽  
Simulated Solar Light ◽  
Citrate Complex

Surface functionalization of graphitic carbon nitride (g-C3N4) through self-assembly is an effective way to improve the photocatalytic activity and to couple with chemical catalytic process. Herein, we report that Fe (III)-citrate complex molecules are assembled on the surface of g-C3N4 to improve the photocatalytic activity by coupling with Fenton reaction. The iron (III) species attached on the surface of g-C3N4 are in the form of complex. The Fe (III)-citrate complex shows little impact on the bulk structures of g-C3N4. In the dark, assembly of Fe (III)-citrate complexes on g-C3N4 (Fe (III)-Cit/g-C3N4) exhibits no activity for degrading the Rhodamine B (RhB) solution under the assistance of H2O2. But, it shows high catalytic activity with degradation efficiency of 100% for RhB solution (10 mg L-1) under the simulated solar light irradiation for 30 minutes. Furthermore, the adsorption capacity and photocatalytic activity are retainable during the following 5 cycles. The retainable stability and enhanced catalytic activity of the assembly of Fe (III)-citrate complexes on g-C3N4 pave the ways to design advanced photocatalysts by employing supermolecular interaction.

scholarly journals Front Cover: Symmetry-Directed Self-Assembly of a Tetrahedral Protein Cage Mediated by de Novo-Designed Coiled Coils (ChemBioChem 19/2017)

ChemBioChem ◽  
2017 ◽  
Vol 18 (19) ◽  
pp. 1871-1871 ◽  
Author(s):  
Somayesadat Badieyan ◽  
Aaron Sciore ◽  
Joseph D. Eschweiler ◽  
Philipp Koldewey ◽  
Ajitha S. Cristie-David ◽  
...  
Keyword(s):  
Self Assembly ◽  
De Novo ◽  
Coiled Coils ◽  
Front Cover ◽  
Protein Cage

scholarly journals Hemin-bound cysteinyl bolaamphiphile self-assembly as a horseradish peroxidase-mimetic catalyst

RSC Advances ◽  
2017 ◽  
Vol 7 (62) ◽  
pp. 38989-38997 ◽  
Author(s):  
Chaemyeong Lee ◽  
Sang-Yup Lee
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Horseradish Peroxidase ◽  
Self Assembly ◽  
High Catalytic Activity ◽  
Peroxidase Mimetic

A horseradish peroxidase (HRP) mimetic catalyst was constructed by tethering hemin to the cysteinyl bolaamphiphile assembly through thiol–Fe bond. The prepared catalyst showed high catalytic activity comparable to HRP even at the high temperature.

Metal Ion Assisted Folding and Supramolecular Organization of a De Novo Designed Metalloprotein

2004 ◽  
Vol 57 (1) ◽  
pp. 33 ◽  
Author(s):  
Guido W. M. Vandermeulen ◽  
Christos Tziatzios ◽  
Dieter Schubert ◽  
Philip R. Andres ◽  
Alexander Alexeev ◽  
...  
Keyword(s):  
Protein Folding ◽  
Self Assembly ◽  
Metal Ion ◽  
De Novo ◽  
Coiled Coil ◽  
Coiled Coils ◽  
The Self ◽  
Supramolecular Organization ◽  
Low Concentrations ◽  
The Moment

This paper describes the supramolecular organization of a novel de novo designed metalloprotein, which consists of two N-terminal terpyridine modified coiled-coil protein folding motif sequences held together by an iron(II) ion. The self-assembly of the metalloprotein is the result of the interplay of metal ion complexation and protein folding, and can be manipulated by changes in concentration, temperature, and solvent. At low concentrations, folding and organization of the metalloprotein resembles that of the native coiled-coil peptide. Besides unimeric species, also dimeric and tetrameric metalloprotein assemblies were found. Several indications suggest that at least part of these unimeric species may exist as intramolecularly folded coiled-coils, however, unambiguous proof is lacking at the moment. At higher concentrations, folding and organization is dominated by the large octahedral [FeII(terpy)2] complexes (terpy = 2,2′:6′,2″-terpyridine) and considerable amounts of large, ill-defined aggregates are formed.

Evaluation of de novo-designed coiled coils as off-the-shelf components for protein assembly

2017 ◽  
Vol 2 (2) ◽  
pp. 140-148 ◽  
Author(s):  
Ajitha S. Cristie-David ◽  
Aaron Sciore ◽  
Somayesadat Badieyan ◽  
Joseph D. Escheweiler ◽  
Philipp Koldewey ◽  
...  
Keyword(s):  
De Novo ◽  
Protein Assembly ◽  
Coiled Coils ◽  
Optimize Design

Coiled coils are effective at oligomerizing larger proteins, but oligomerization states may change unless care is taken to optimize design.

scholarly journals Microflowers formed by complexation-driven self-assembly between palladium(ii) and bis-theophyllines: immortal catalyst for C–C cross-coupling reactions

RSC Advances ◽  
2021 ◽  
Vol 11 (56) ◽  
pp. 35311-35320
Author(s):  
Katsuya Kaikake ◽  
Naoki Jou ◽  
Go Shitara ◽  
Ren-Hua Jin
Keyword(s):  
Catalytic Activity ◽  
Self Assembly ◽  
Palladium Complex ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
High Catalytic Activity ◽  
Coupling Reactions ◽  
Cross Coupling Reactions

Bis-theophylline-palladium complex exhibit high catalytic activity in the C–C coupling reaction with excellent recyclability in the presence of NaCl.

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

Ordered Intermetallic Nanoparticles with High Catalytic Activity Prepared by an Electrochemically Induced Phase Transformation

2019 ◽  
Author(s):  
Du Sun ◽  
yunfei wang ◽  
Kenneth Livi ◽  
chuhong wang ◽  
ruichun luo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffusion Mechanism ◽  
Reduction Reaction ◽  
Atomic Scale ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Magnetic Devices ◽  
Disordered Alloys ◽  
Ordered Intermetallic ◽  
Intermetallic Nanoparticles

<div> <p>The synthesis of alloys with long range atomic scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in materials development. We report a process for converting colloidally synthesized ordered intermetallic PdBi<sub>2</sub> to ordered intermetallic Pd<sub>3</sub>Bi nanoparticles under ambient conditions by an electrochemically induced phase transition. The low melting point of PdBi<sub>2</sub> corresponds to low vacancy formation energies which enables the facile removal of the Bi from the surface, while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd<sub>3</sub>Bi exhibits 11x and 3.5x higher mass activty and high methanol tolerance for the oxygen reduction reaction compared to Pt/C and Pd/C, respectively,which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble metal rich ordered intermetallic phases with high catalytic activity, and sets forth guidelines for the design of ordered intermetallic compounds under ambient conditions.</p> </div>

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

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