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In this study, a new Pirkle-type chiral column stationary phase for resolution of beta-methylphenylethyl amine was described by using activated Sepharose 4B as a matrix, L-tyrosine as a spacer arm, and an aromatic amine derivative of L-glutamic acid as a ligand. The binding capacities of the stationary phase were determined at different pH values (pH = 6, 7, and 8) using buffer solutions as mobile phase, and enantiomeric excess (ee) was determined by HPLC equipped with chiral column. The ee was found to be 47%.
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http://dx.doi.org/10.1002/chir.20736 | DOI Listing |
Genes Genet Syst
September 2025
Department of Molecular Biology, Graduate School of Pharmaceutical Sciences, Kyushu University.
In most eubacteria the initiator protein DnaA triggers chromosomal replication by forming an initiation complex at the origin of replication and also functions as a transcriptional regulator, coordinating gene expression with cell cycle progression. While DnaA-regulated genes are relatively well characterized in exponentially growing cells, its role in gene regulation during stationary phase remains insufficiently explored. Here, using an aquatic bacterium Caulobacter crescentus as a model, we show that C.
View Article and Find Full Text PDFCurr Opin Struct Biol
September 2025
Department of Chemistry and Chemical Biology, Northeastern University, 360 Huntington Ave, Boston, MA 02115, USA. Electronic address:
Our previously proposed Ras dimerization model is consistent with recent details observed by NMR in that Raf activation is centered on the Ras/Raf dimer, distinct from one in which Ras activates Raf as a monomer with the Raf cysteine rich domain inserted in the membrane. We review mechanistic understanding of Raf activation within nanoclusters of Ras on the membrane, with a shift to dimers upon binding Raf. This sets the stage for a signaling platform composed of Ras/Raf and Galectin dimers that facilitates the release of Raf autoinhibition and folding of the Raf intrinsically disordered region between the Ras-binding domains and the kinase bound to 14-3-3 and MEK.
View Article and Find Full Text PDFTurkiye Parazitol Derg
September 2025
Ege University Faculty of Medicine, Department of Parasitology, İzmir, Türkiye.
Objective: Leishmaniasis, caused by protozoan parasites of the spp., presents significant global health challenges, with visceral leishmaniasis (VL) and cutaneous leishmaniasis forms causing severe morbidity and mortality. Macrophages serve as primary host cells, where spp.
View Article and Find Full Text PDFJ Sep Sci
September 2025
Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
Nifurtimox (NFX) is a chiral drug used for the treatment of Chagas Disease. Little attention has been paid to the enantioselective properties of chiral drugs used for neglected tropical diseases, highlighting the need for further studies in this area. In this work, the enantioselective properties of NFX were carefully investigated by HPLC using different chiral stationary phases (CSPs) and chromatographic modes.
View Article and Find Full Text PDFMicrobiol Spectr
September 2025
Faculty of Medicine and Medical Sciences, University of Balamand, Tripoli, Lebanon.
In Gram-negative bacteria, resistance-nodulation-division (RND)-type efflux pumps, particularly AcrAB-TolC, play a critical role in mediating resistance to antimicrobial agents and toxic metabolites, contributing to multidrug resistance. is an entomopathogenic bacterium that has garnered significant interest due to its production of bioactive specialized metabolites with anti-inflammatory, antimicrobial, and scavenger deterrent properties. In previous work, we demonstrated that AcrAB confers self-resistance to stilbenes in TT01.
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