Directed evolution, enzyme design, and effective immobilization have been used to improve the catalytic activity. Dynamic polymers offer a promising platform to improve enzyme activity in aqueous solutions. Here, amphiphilic dynamers and lipase self-assemble into nanoparticles of 150- to 600-nanometer diameter, showing remarkable threefold enhancement in catalytic activity. In addition, they also demonstrated the ability to promote the reversible refolding of the partially or completely denatured lipase. The catalytic efficiency is completed with its more convenient handling of dynameric nanoparticles facilitating the efficient recovery and reuse of the enzyme with cost-effective uses. Molecular simulation studies revealed an in-depth understanding of how the dynamer action mechanism affects the conformational changes of lipase. The dynamer served as an effective hydrophobic support, facilitating the lid opening and substrate access to the catalytic triad, resulting in a substantial activation with an improved stability and recyclability of the lipase.
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http://dx.doi.org/10.1126/sciadv.ads9371 | DOI Listing |
Inorg Chem
March 2025
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
The direct catalytic C-H functionalization of aromatic compounds such as anisoles and thioanisoles is of great interest and significance. However, achieving precise regioselectivity remains a major challenge. In this study, we conducted comprehensive density functional theory calculations to explore the mechanisms of rare-earth-catalyzed regioselective C-H alkylation, borylation, and silylation of anisole and thioanisole.
View Article and Find Full Text PDFJ Am Chem Soc
March 2025
Department of Chemistry, and FQRNT Center for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada.
Carbenes are critical intermediates in organic chemistry, recognized for their exceptional reactivity and versatility. However, conventional methods for carbene generation are often associated with safety risks and hazardous procedures. This study presents a Ga-ZnO nanosheets photocatalyst with a (100) preferred orientation, featuring abundant refined frustrated Lewis pair (FLP) sites, excellent light absorption, and efficient charge transport properties.
View Article and Find Full Text PDFACS Sens
March 2025
Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou 221002, Jiangsu, China.
Traditional biological detection methods rely on signal amplification strategies such as enzymatic catalysis or nucleic acid amplification. However, their efficiency decreases in low-temperature environments, compromising their detection sensitivity. To break the loss of enzyme catalytic activity at low temperatures, research on cold-adaptive nanozymes has attracted much attention.
View Article and Find Full Text PDFChempluschem
March 2025
Vrije Universiteit Amsterdam, Chemistry & Pharmaceutical Sciences, De Boelelaan 1083, 1081 HV, Amsterdam, NETHERLANDS, KINGDOM OF THE.
We have quantum chemically investigated the catalytic effect of hydrogen bonding organocatalysts, (H2N)2C=X (X = O, S, Se, NH, PH, AsH, CH2, SiH2 GeH2), such as urea, on the classic Diels-Alder reaction. All studied hydrogen bond donor catalysts enhance the Diels-Alder reaction between acrolein and 1,3-butadiene to a similar extent. Our activation strain and Kohn-Sham molecular orbital analyses show that these organocatalysts lower the reaction barrier by polarizing the p-orbitals away from the reactive carbon atoms of acrolein, reducing the Pauli repulsion between the reactants.
View Article and Find Full Text PDFJ Am Chem Soc
March 2025
Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610065, China.
The ongoing discovery of highly reactive ambiphilic main-group species has significantly advanced the development of main-group chemistry, particularly in the realms of small molecule activation and catalysis. Theoretically, compounds featuring smaller HOMO-LUMO gaps gain stronger ambiphilicity and higher reactivity. In this work, we fundamentally demonstrate that MeSb holds the smallest HOMO-LUMO gap among trimethylpnictines, indicating its outstanding ambiphilicity.
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