Asymmetric Synthesis of Flavanols via Cu-Catalyzed Kinetic Resolution of Chromenes and Their Anti-Inflammatory Activity
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ABSTRACT:
PROVIDER: PRJNA750477 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR15288882_1.fastq.gz | Fastqsanger.gz | |||
| SRR15288882_2.fastq.gz | Fastqsanger.gz | |||
| SRR15288883_1.fastq.gz | Fastqsanger.gz | |||
| SRR15288883_2.fastq.gz | Fastqsanger.gz | |||
| SRR15288884_1.fastq.gz | Fastqsanger.gz |
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Project description:We report a highly efficient kinetic resolution of chromenes for the first time via a Cu-catalyzed asymmetric hydroboration. This novel approach features simple one-pot synthesis of chiral flavan-3-ols containing two vicinal stereogenic centers via a highly efficient kinetic resolution pathway (s factor up to 1060, >99% ee for most substrates and products, exclusively trans products). In addition, the anti-inflammation effects of these diversified flavan-3-ols have been further studied by the in vitro experiments and RNA-sequencing (RNA-seq) analysis. The modified flavan-3-ol natural product derivatives showed inhibitory effects on the expression and secretion of pro-inflammation cytokines including IL-1β, IL-6 and TNF-α, as well as inhibiting the inflammation responses through downregulating the gene transcriptions closely related to IL-17 signaling pathway, PI3K-Akt signaling pathway and TNF signaling pathway, which suggest these newly synthesized compounds are potent lead compounds for treating inflammation diseases.
2021-07-30 | GSE181052 | GEO
Project description:We report here a Cu-catalyzed azide-alkyne-thiol reaction forming thiotriazoles as the major by-product under widely used bioorthogonal protein labelling “click” conditions. The development of Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) had tremendous impact on many biological discoveries. However, the considered chemoselectivity of CuAAC is hampered by high reactivity of cysteine free thiols yielding thiotriazole protein conjugates. The reaction by-products generate false positive protein hits in “functional” proteomic studies. The reported detail investigation of conjugates between chemical probes containing terminal alkynes, azide-tags and cell lysates reveals formation of thiotriazoles, which can be readily detected by in-gel fluorescence scanning or after peptide and protein enrichment by MS-based proteomics. The produced fluorescent bands or enriched proteins may not result from the important enzymatically driven reaction and can be falsely assigned as hits. This study provides a complete list of the most common background proteins. The knowledge of this previously overlooked reactivity now leads to improved experimental design. Here, we present modified CuAAC conditions, which avoids the undesired product formation and diminishes the background.
2024-01-12 | PXD043402 | Pride
Project description:Flavanols are privileged heterocyclic compounds in medicinal chemistry. It is notable to develop an efficient and straightforward protocol for accessing chiral flavanols with precise control of the stereocenters. Here, a highly efficient kinetic resolution of chromenes was reported via Cu-catalyzed asymmetric hydroboration. This previously unidentified approach features a one-step synthesis of chiral flavan-3-ols containing two vicinal stereogenic centers via a highly efficient kinetic resolution (s factor up to 1060, >99% ee for most products). In addition, the anti-inflammation effects of these diversified flavan-3-ols were studied by the in vitro experiments and RNA sequencing analysis. These flavan-3-ols showed inhibitory effects on the secretion of pro-inflammation cytokines including interleukin-1β (IL-1β), IL-6, and tumor necrosis factor-α (TNF-α), as well as inhibiting the inflammation responses through down-regulating the gene transcriptions closely related to PI3K-Akt signaling pathway and TNF signaling pathway. The results suggested that these newly synthesized flavan-3-ols have the potential to be lead compounds for anti-inflammatory drugs.
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Project description:The essential yet toxic nature of Cu ions in living cells requires exquisite control of Cu homeostasis. The fungal pathogen C. neoformans regulates Cu homeostasis for survival during a complex host colonization process. During pulmonary infection host innate immune cells use Cu in an attempt to toxify C. neoformans, which responds by activating expression of Cu detoxifying proteins. However, during brain colonization expression of the fungal Cu import machinery is activated and required for virulence. To achieve the genetic plasticity required for adaptation to a continuum of distinct Cu environments within the host, C. neoformans utilizes the Cu-responsive transcription factor, Cuf1. Cuf1 is unique as it senses and responds to both high and low Cu environments, activating different sets of genes dependent on environmental Cu status. Cells lacking Cuf1 are compromised for colonization of the lungs and brain, highlighting Cuf1 as an important virulence factor. A genome-wide assessment of the Cuf1 binding sites in the genome of C. neoformans driven by Cu status identified novel genes required for adaptation to high and low Cu environments. These genes and their regulation provide new insights with respect to adaptive responses to changes in host Cu availability and could reveal new targets for therapeutic intervention in cryptococcosis.
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