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1.
Angew Chem Int Ed Engl ; 62(16): e202218413, 2023 04 11.
Artigo em Inglês | MEDLINE | ID: mdl-36799770

RESUMO

Herein, we describe the creation of an artificial protein cage housing a dual-metal-tagged guest protein that catalyzes a linear, two-step sequential cascade reaction. The guest protein consists of a fusion protein of HaloTag and monomeric rhizavidin. Inside the protein capsid, we established a ruthenium-catalyzed allylcarbamate deprotection reaction followed by a gold-catalyzed ring-closing hydroamination reaction that led to indoles and phenanthridines with an overall yield of up to 66 % in aqueous solutions. Furthermore, we show that the encapsulation stabilizes the metal catalysts against deactivation by air, proteins and cell lysate.


Assuntos
Ouro , Rutênio , Catálise , Indóis
2.
Int J Nanomedicine ; 17: 5081-5097, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36340183

RESUMO

Purpose: The conventional techniques for the preparation of reconstituted high-density lipoprotein (rHDL) are hampered by long process times, the need for large amounts of starting material, and harsh preparation conditions. Here, we present a novel rHDL preparation method to overcome these challenges. Furthermore, we propose a dual mode of action for rHDL loaded with the immunosuppressant drug everolimus (Eve-rHDL) in the context of atherosclerosis and cardiovascular disease. Methods: We use dual centrifugation for rHDL nanoparticle preparation and characterize the physicochemical properties by NS-TEM, N-PAGE, DLS, AF4, and HPLC. In addition, we determine the biological efficacy in human and murine cell culture with regard to cellular uptake, cholesterol efflux, and proliferation. Results: We confirm the characteristic particle size of 10 nm, discoidal morphology, and chemical composition of the rHDL preparations and identify dual centrifugation as an ideal method for cost-effective aseptic rHDL manufacturing. rHDL can be prepared in approx. 1.5 h with batch sizes as little as 89 µL. Moreover, we demonstrate the cholesterol efflux capacity and anti-proliferative activity of Eve-rHDL in vitro. The anti-proliferative effects were comparable to free Eve, thus confirming the suitability of rHDL as a capable drug delivery vehicle. Conclusion: Eve-rHDL shows great efficacy in vitro and may further be employed to target atherosclerotic plaques in vivo. Highly effective anti-atherosclerotic therapy might be feasible by reducing both inflammatory- and lipid burden of the plaques. Dual centrifugation is an ideal technique for the efficient application of the rHDL platform in cardiovascular disease and beyond.


Assuntos
Aterosclerose , Doenças Cardiovasculares , Placa Aterosclerótica , Camundongos , Humanos , Animais , Lipoproteínas HDL/química , Everolimo/farmacologia , Doenças Cardiovasculares/tratamento farmacológico , Aterosclerose/tratamento farmacológico , Placa Aterosclerótica/tratamento farmacológico , Colesterol , Centrifugação
3.
Angew Chem Int Ed Engl ; 60(44): 23835-23841, 2021 10 25.
Artigo em Inglês | MEDLINE | ID: mdl-34418246

RESUMO

Compartmentalization of chemical reactions inside cells are a fundamental requirement for life. Encapsulins are self-assembling protein-based nanocompartments from the prokaryotic repertoire that present a highly attractive platform for intracellular compartmentalization of chemical reactions by design. Using single-molecule Förster resonance energy transfer and 3D-MINFLUX analysis, we analyze fluorescently labeled encapsulins on a single-molecule basis. Furthermore, by equipping these capsules with a synthetic ruthenium catalyst via covalent attachment to a non-native host protein, we are able to perform in vitro catalysis and go on to show that engineered encapsulins can be used as hosts for transition metal catalysis inside living cells in confined space.


Assuntos
Proteínas de Bactérias/química , Nanoestruturas/química , Compostos Organometálicos/química , Catálise , Transferência Ressonante de Energia de Fluorescência , Microscopia de Fluorescência , Mycobacterium smegmatis/química , Tamanho da Partícula
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