scholarly journals How to Separate Kinase Inhibition from Undesired Monoamine Oxidase A Inhibition—The Development of the DYRK1A Inhibitor AnnH75 from the Alkaloid Harmine

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5962 ◽  
Author(s):  
Anne Wurzlbauer ◽  
Katharina Rüben ◽  
Ece Gürdal ◽  
Apirat Chaikuad ◽  
Stefan Knapp ◽  
...  
Keyword(s):  
De Novo ◽  
Binding Mode ◽  
Crystal Structure Analysis ◽  
Monoamine Oxidase A ◽  
Direct Modification ◽  
Structure Activity ◽  
Potent Inhibition ◽  
Mao A ◽  
Systematic Structure ◽  
Polar Substituents

The β-carboline alkaloid harmine is a potent DYRK1A inhibitor, but suffers from undesired potent inhibition of MAO-A, which strongly limits its application. We synthesized more than 60 analogues of harmine, either by direct modification of the alkaloid or by de novo synthesis of β-carboline and related scaffolds aimed at learning about structure–activity relationships for inhibition of both DYRK1A and MAO-A, with the ultimate goal of separating desired DYRK1A inhibition from undesired MAO-A inhibition. Based on evidence from published crystal structures of harmine bound to each of these enzymes, we performed systematic structure modifications of harmine yielding DYRK1A-selective inhibitors characterized by small polar substituents at N-9 (which preserve DYRK1A inhibition and eliminate MAO-A inhibition) and beneficial residues at C-1 (methyl or chlorine). The top compound AnnH75 remains a potent DYRK1A inhibitor, and it is devoid of MAO-A inhibition. Its binding mode to DYRK1A was elucidated by crystal structure analysis, and docking experiments provided additional insights for this attractive series of DYRK1A and MAO-A inhibitors.

Quantitative Structure Activity Relationship of New 7-Oxycoumarin Derivatives as Potent and Selective Monoamine Oxidase a Inhibitors

2013 ◽  
Vol 798-799 ◽  
pp. 1109-1112
Author(s):  
Xian Chao Li ◽  
Hong Zong Si ◽  
Hua Gao ◽  
Hong Lin Zhai ◽  
Yun Bo Duan
Keyword(s):  
Heuristic Method ◽  
Quantitative Structure Activity Relationship ◽  
Molecular Structures ◽  
Monoamine Oxidase A ◽  
Structural Factors ◽  
Quantitative Structure ◽  
Quantum Chemical Descriptors ◽  
Structure Activity ◽  
Mao A

New series of 4-methyl and 3,4-dimethyl-7-oxycoumarin derivatives showed in vitro high anity and selectivity toward MAO-A isoenzyme. To build the quantitative structure-activity relationships (QSAR) between the molecular structures and the inhibitory of 32 compounds, and to further discuss the structural factors that influenced the selectivity of compounds. The topological, constitutional, geometrical, electrostatic and quantum-chemical descriptors of 32 compounds were calculated by CODESSA, and these descriptors were preselected with the heuristic method (HM). As a result, the four descriptor linear model was developed to describe the relationship between the molecular structures and the selectivity of MAO-A inhibitors. Based on the model, we can also designed new compounds with higher activities finally.

scholarly journals Interactions of Desmethoxyyangonin, a Secondary Metabolite fromRenealmia alpinia, with Human Monoamine Oxidase-A and Oxidase-B

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Narayan D. Chaurasiya ◽  
Francisco León ◽  
Yuanqing Ding ◽  
Isabel Gómez-Betancur ◽  
Dora Benjumea ◽  
...  
Keyword(s):  
Enzyme Inhibitor ◽  
Equilibrium Dialysis ◽  
Monoamine Oxidase A ◽  
Tropical Rainforests ◽  
Reversible Binding ◽  
Mao B ◽  
Potent Inhibition ◽  
Mao A ◽  
Preferential Binding ◽  
Phytochemical Studies

Renealmia alpinia(Zingiberaceae), a medicinal plant of tropical rainforests, is used to treat snakebites and other injuries and also as a febrifuge, analgesic, antiemetic, antiulcer, and anticonvulsant. The dichloromethane extract ofR. alpinialeaves showed potent inhibition of human monoamine oxidases- (MAOs-) A and B. Phytochemical studies yielded six known compounds, including pinostrobin1, 4′-methyl ether sakuranetin2, sakuranetin3, pinostrobin chalcone4, yashabushidiol A5, and desmethoxyyangonin6. Compound6displayed about 30-fold higher affinity for MAO-B than MAO-A, with Ki values of 31 and 922 nM, respectively. Kinetic analysis of inhibition and equilibrium-dialysis dissociation assay of the enzyme-inhibitor complex showed reversible binding of desmethoxyyangonin6with MAO-A and MAO-B. The binding interactions of compound6in the active site of the MAO-A and MAO-B isoenzymes, investigated through molecular modeling algorithms, confirmed preferential binding of desmethoxyyangonin6with MAO-B compared to MAO-A. Selective reversible inhibitors of MAO-B, like desmethoxyyangonin6,may have important therapeutic significance for the treatment of neurodegenerative disorders, such as Parkinson’s disease and Alzheimer’s disease.

scholarly journals De Novo Design of Selective Quadruplex‐Duplex Junction Ligands and Structural Characterisation of their Binding Mode: Targeting the G4 Hot‐Spot

2020 ◽  
Author(s):  
Laura Díaz-Casado ◽  
Israel Serrano-Chacón ◽  
Laura Montalvillo-Jiménez ◽  
Francisco Corzana ◽  
Agatha Bastida ◽  
...  
Keyword(s):  
De Novo ◽  
Hot Spot ◽  
Binding Mode ◽  
De Novo Design ◽  
Structural Characterisation

scholarly journals Front Cover: De Novo Design of Selective Quadruplex–Duplex Junction Ligands and Structural Characterisation of Their Binding Mode: Targeting the G4 Hot‐Spot (Chem. Eur. J. 20/2021)

2021 ◽  
Vol 27 (20) ◽  
pp. 6101-6101
Author(s):  
Laura Díaz‐Casado ◽  
Israel Serrano‐Chacón ◽  
Laura Montalvillo‐Jiménez ◽  
Francisco Corzana ◽  
Agatha Bastida ◽  
...  
Keyword(s):  
De Novo ◽  
Hot Spot ◽  
Binding Mode ◽  
De Novo Design ◽  
Front Cover ◽  
Structural Characterisation

scholarly journals Structure activity relationships and the binding mode of quinolinone-pyrimidine hybrids as reversal agents of multidrug resistance mediated by P-gp

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jerónimo Laiolo ◽  
Priscila Ailin Lanza ◽  
Oscar Parravicini ◽  
Cecilia Barbieri ◽  
Daniel Insuasty ◽  
...  
Keyword(s):  
Multidrug Resistance ◽  
Molecular Complexes ◽  
Binding Mode ◽  
Reversal Agents ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Doxorubicin Toxicity ◽  
Key Residues ◽  
Nanomolar Range ◽  
Experimental Structure

AbstractP-gp-associated multidrug resistance is a major impediment to the success of chemotherapy. With the aim of finding non-toxic and effective P-gp inhibitors, we investigated a panel of quinolin-2-one-pyrimidine hybrids. Among the active compounds, two of them significantly increased intracellular doxorubicin and rhodamine 123 accumulation by inhibiting the efflux mediated by P-gp and restored doxorubicin toxicity at nanomolar range. Structure–activity relationships showed that the number of methoxy groups, an optimal length of the molecule in its extended conformation, and at least one flexible methylene group bridging the quinolinone to the moiety bearing the pyrimidine favored the inhibitory potency of P-gp. The best compounds showed a similar binding pattern and interactions to those of doxorubicin and tariquidar, as revealed by MD and hybrid QM/MM simulations performed with the recent experimental structure of P-gp co-crystallized with paclitaxel. Analysis of the molecular interactions stabilizing the different molecular complexes determined by MD and QTAIM showed that binding to key residues from TMH 4–7 and 12 is required for inhibition.

scholarly journals Semi-Synthesis of Harringtonolide Derivatives and Their Antiproliferative Activity

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1380
Author(s):  
Xiutao Wu ◽  
Lijie Gong ◽  
Chen Chen ◽  
Ye Tao ◽  
Wuxi Zhou ◽  
...  
Keyword(s):  
Antiproliferative Activity ◽  
Normal Cell ◽  
Selectivity Index ◽  
Cytotoxic Activities ◽  
Structure Activity ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Hct 116 ◽  
Systematic Structure

Harringtonolide (HO), a natural product isolated from Cephalotaxus harringtonia, exhibits potent antiproliferative activity. However, little information has been reported on the systematic structure−activity relationship (SAR) of HO derivatives. Modifications on tropone, lactone, and allyl positions of HO (1) were carried out to provide 17 derivatives (2–13, 11a–11f). The in vitro antiproliferative activity against four cancer cell lines (HCT-116, A375, A549, and Huh-7) and one normal cell line (L-02) was tested. Amongst these novel derivatives, compound 6 exhibited comparable cell growth inhibitory activity to HO and displayed better selectivity index (SI = 56.5) between Huh-7 and L-02 cells. The SAR results revealed that the tropone and lactone moieties are essential for the cytotoxic activities, which provided useful suggestions for further structural optimization of HO.

scholarly journals Discovery of a novel RORγ antagonist with skin-restricted exposure for topical treatment of mild to moderate psoriasis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Suxing Liu ◽  
Dong Liu ◽  
Ru Shen ◽  
Di Li ◽  
Qiyue Hu ◽  
...  
Keyword(s):  
Topical Treatment ◽  
Clinical Success ◽  
Systemic Exposure ◽  
Skin Inflammation ◽  
Targeted Therapeutics ◽  
High Exposure ◽  
Structure Activity ◽  
Potential Safety ◽  
Systematic Structure ◽  
And Function

AbstractClinical success of IL-17/IL-23 pathway biologics for the treatment of moderate to severe psoriasis suggests that targeting RORγt, a master regulator for the proliferation and function of Th17 cells, could be an effective alternative. However, oral RORγ antagonists (VTP43742, TAK828) with high systemic exposure showed toxicity in phase I/II clinical trials and terminated development. To alleviate the potential safety concerns, identifying compounds with skin-restricted exposure amenable for topical use is of great interest. Systematic structure activity relationship study and multi-parameter optimization led to the discovery of a novel RORγ antagonist (SHR168442) with desired properties for a topical drug. It suppressed the transcription of IL-17 gene, leading to reduction of IL-17 cytokine secretion. It showed high exposure in skin, but low in plasma. Topical application of SHR168442 in Vaseline exhibited excellent efficacy in the imiquimod-induced and IL-23-induced psoriasis-like skin inflammation mouse models and correlated with the reduction of Th17 pathway cytokines, IL-6, TNFα and IL-17A. This work demonstrated restricted skin exposure of RORγ antagonist may provide a new topical treatment option as targeted therapeutics for mild to moderate psoriasis patients and may be suitable for the treatment of any other inflammatory disorders that are accessible locally.

Quinolin-2-one-pyrimidine Hybrids Acting as Potent Reversal Agents on the P-gp-mediated Multidrug Resistance: Insights into Structure-activity Relationships and the Binding Mode

2021 ◽  
Author(s):  
Jerónimo Laiolo ◽  
Priscila Ailin Lanza ◽  
Oscar Parravicini ◽  
Cecilia Barbieri ◽  
Daniel Insuasty ◽  
...  
Keyword(s):  
Multidrug Resistance ◽  
Molecular Complexes ◽  
Binding Mode ◽  
Reversal Agents ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Doxorubicin Toxicity ◽  
Key Residues ◽  
Nanomolar Range ◽  
Experimental Structure

Abstract P-gp-associated multidrug resistance (MDR) is a major impediment to the success of chemotherapy. With the aim of finding non-toxic and effective P-gp inhibitors, we investigated a panel of quinolin-2-one-pyrimidine hybrids. Among the active compounds, two of them significantly increased intracellular doxorubicin and rhodamine 123 accumulation by inhibiting the efflux mediated by P-gp and restored doxorubicin toxicity at nanomolar range. Structure-activity relationships showed that the number of methoxy groups, an optimal length of the molecule in its extended conformation, and at least one flexible methylene group bridging the quinolinone moiety favored the inhibitory potency of P-gp. The best compounds showed a similar binding pattern and interactions to those of doxorubicin and tariquidar, as revealed by MD and hybrid QM/MM simulations performed with the recent experimental structure of P-gp co-crystallized with paclitaxel. Analysis of the molecular interactions stabilizing the different molecular complexes determined by MD and QTAIM showed that binding to key residues from TMH 4–7 and 12 is required for inhibition.

scholarly journals Structural basis for VPg-induced formation of RNA-dependent RNA polymerase multimeric complexes

2014 ◽  
Vol 70 (a1) ◽  
pp. C1601-C1601
Author(s):  
Ji-Hye Lee ◽  
Yeon Bin Chung ◽  
Jong Hyeon Seok ◽  
Kang Rok Han ◽  
Sella Kim ◽  
...  
Keyword(s):  
Rna Polymerase ◽  
De Novo ◽  
Helical Structure ◽  
Science Research ◽  
Binding Mode ◽  
Structural Basis ◽  
Murine Norovirus ◽  
Virion Protein ◽  
Electron Microscopic ◽  
Rna Dependent Rna Polymerase

Norovirus is the leading cause of epidemic acute, nonbacterial gastroenteritis, and adopts de novo and VPg (Virion protein genome linked)-primed RNA synthesis by RNA-dependent RNA polymerase (RdRp). To understand the interaction between RdRp and VPg in replication of murine norovirus-1 (MNV-1), we determined the crystal structure of MNV-1 RdRp-VPg(1-73)-RNA complex. VPg was bound to the base of the palm domain and the tip of the fingers domain of RdRp simultaneously, but RNA template could not be modeled. The binding affinity constants (Kd) for RdRp-VPg was 3.7411.57 nM and VPg(1-73) showed approximately 90-fold less affinity than that of full-length VPg. In addition to this multiple binding mode, VPg enhanced the interactions of RdRp hexamers, leading to the formation of high-order multimers or tubular fibrils with significantly increased polymerase activity, confirmed by electron microscopic and biochemical studies. Our data indicated that MNV-1 VPg with helical structure was bound to RdRp at multiple sites and induces RdRp multimerization in viral replication. The multimers of RdRp-VPg-RNA can provide a mechanistic understanding of viral polymerase multimeric arrays and a new tool for development of antivirals to control norovirus outbreaks. This work was supported by a grant of the Korea Healthcare Technology R&D Project, Ministry of Health, Welfare and Family Affairs (A085119 K.H.K), Basic Science Research Program through the National Research Foundation (NRF-2013R1A1A2064940, L.J-H), Korea University Grant (L.J-H), and the BK21 plus program of the Ministry of Education, Korea.

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