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Unlocking HFIP for Fluoroalkylation with Molecular Photoelectrocatalysis.
Angew Chem Int Ed Engl
January 2025
Xiamen University, Chemistry, 422 South Siming Road, 361005, Xiamen, CHINA.
Despite the increasing interest in radical-based fluoroalkylation techniques, the organofluorine compounds bearing the partially fluorinated hexafluoroisopropyl group remain extremely scarce due to the lack of appropriate reagents. Herein we report an unprecedented photoelectrocatalytic method for the C-H hexafluoroisopropylation of indoles and tryptophan peptides, utilizing the readily available hexafluoro-2-propanol (HFIP) as the fluoroalkylation reagent. In this process, HFIP is converted into hexafluoroisopropyl radicals, enabling fluoroalkylation reactions.
View Article and Find Full Text PDFThe Aryl Hydrocarbon Receptor (AhR) Is a Novel Gene Involved in Proper Physiological Functions of Pancreatic β-Cells.
Cells
January 2025
Research Institute of Medical and Health Sciences, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates.
The Kynurenine pathway is crucial in metabolizing dietary tryptophan into bioactive compounds known as kynurenines, which have been linked to glucose homeostasis. The aryl hydrocarbon receptor (AhR) has recently emerged as the endogenous receptor for the kynurenine metabolite, kynurenic acid (KYNA). However, the specific role of AhR in pancreatic β-cells remains largely unexplored.
View Article and Find Full Text PDFCross-feeding of amino acid pathway intermediates is common in co-cultures of auxotrophic Escherichia coli.
Metab Eng
January 2025
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA. Electronic address:
Amino acid auxotrophy refers to an organism's inability to synthesize one or more amino acids that are required for cell growth. In microbiome research, co-cultures of amino acid auxotrophs are often used to investigate metabolite cross-feeding interactions and model community dynamics. Thus far, it has been implicitly assumed that amino acids are mainly cross-fed between these auxotrophs.
View Article and Find Full Text PDFAnthranilic Acid-G-Protein Coupled Receptor109A-Cytosolic Phospholipase A2-Myelin-Cognition Cascade: A New Target for the Treatment/Prevention of Cognitive Impairment in Schizophrenia, Dementia, and Aging.
Int J Mol Sci
December 2024
Department of Psychiatry, Tufts University School of Medicine, Boston, MA 02111, USA.
Cognitive impairment is a core feature of neurodevelopmental (schizophrenia) and aging-associated (mild cognitive impairment and Alzheimer's dementia) neurodegenerative diseases. Limited efficacy of current pharmacological treatments warrants further search for new targets for nootropic interventions. The breakdown of myelin, a phospholipids axonal sheath that protects the conduction of nerve impulse between neurons, was proposed as a neuropathological abnormality that precedes and promotes the deposition of amyloid-β in neuritic plaques.
View Article and Find Full Text PDFCharacterization and structural analysis of a versatile aromatic prenyltransferase for imidazole-containing diketopiperazines.
Nat Commun
January 2025
Key Laboratory of Marine Drugs Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao, P R China.
Prenylation modifications of natural products play essential roles in chemical diversity and bioactivities, but imidazole modification prenyltransferases are not well investigated. Here, we discover a dimethylallyl tryptophan synthase family prenyltransferase, AuraA, that catalyzes the rare dimethylallylation on the imidazole moiety in the biosynthesis of aurantiamine. Biochemical assays validate that AuraA could accept both cyclo-(L-Val-L-His) and cyclo-(L-Val-DH-His) as substrates, while the prenylation modes are completely different, yielding C2-regular and C5-reverse products, respectively.
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