Medicinal Chemistry
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Novel natural withanolides induce apoptosis and inhibit migration of neuroblastoma cells through down regulation of N-myc and suppression of Akt/mTOR/NF-κB activation
(Impact Journals, 2018-02-07)Despite recent advances in intensive chemotherapy treatments, long-term success is achieved in less than 30% of children with high-risk neuroblastoma (NB). Key regulatory pathways including the PI3K/Akt, mTOR and NF-κB are ... -
Reagent-controlled regiodivergent ring expansions of steroids
(Nature Publishing Group, 2018-03-05)Ring expansion provides a powerful way of introducing a heteroatom substituent into a carbocyclic framework. However, such reactions are often limited by the tendency of a given substrate to afford only one of the two ... -
Molecular Defects in Cardiac Myofilament Ca2+-Regulation Due to Cardiomyopathy-Linked Mutations Can Be Reversed by Small Molecules Binding to Troponin
(Frontiers Media, 2018-03-27)The inherited cardiomyopathies, hypertrophic cardiomyopathy (HCM) and dilated cardiomyopathy (DCM) are relatively common, potentially life-threatening and currently untreatable. Mutations are often in the contractile ... -
Molecular recognition of physiological substrate noradrenaline by the adrenaline synthesising enzyme PNMT and factors influencing its methyltransferase activity
(Portland Press, 2009-09-15)Substrate specificity is critically important for enzyme catalysis. In the adrenaline synthesising enzyme phenylethanolamine N-methyltransferase (PNMT), minor changes in substituents can convert substrates into inhibitors. ... -
Novel C-Terminal Hsp90 Inhibitor for Head and Neck Squamous Cell Cancer (HNSCC) with in vivo Efficacy and Improved Toxicity Profiles Compared with Standard Agents
(Springer Verlag, 2011-08-12)Background - Current therapies for HNSCC, especially platinum agents, are limited by their toxicities and drug resistance. This study evaluates a novel C-terminal Hsp90 inhibitor (CT-Hsp90-I) for efficacy and toxicity in ... -
Stepwise O atom Transfer in Heme-Based Tryptophan Dioxygenase: Role of Substrate Ammonium in Epoxide Ring Opening
(American Chemical Society, 2018-03-28)Heme-based tryptophan dioxygenases are established immunosuppressive metalloproteins with significant biomedical interest. Here, we synthesized two mechanistic probes to specifically test if the α-amino group of the substrate ... -
Structure-Activity Investigation of a G Protein-Biased Agonist Reveals Molecular Determinants for Biased Signaling of the D2 Dopamine Receptor
(Frontiers Media, 2018-02-21)The dopamine D2 receptor (D2R) is known to elicit effects through activating two major signaling pathways mediated by either G proteins (Gi/o) or β-arrestins. However, the specific role of each pathway in physiological or ... -
Structure-guided design of an Hsp90â N-terminal isoform-selective inhibitor
(Nature Publishing Group, 2018-01-30)The 90 kDa heat shock protein (Hsp90) is a molecular chaperone responsible for folding proteins that are directly associated with cancer progression. Consequently, inhibition of the Hsp90 protein folding machinery results ... -
A novel C-terminal HSP90 inhibitor KU135 induces apoptosis and cell cycle arrest in melanoma cells
(Elsevier, 2011-12-22)Heat shock protein 90 (Hsp90) is differentially expressed in tumor cells including melanoma and involved in proper folding, stabilization and regulation of cellular proteins. We investigated a novobiocin-derived Hsp90 ... -
Grp94 Protein Delivers γ-Aminobutyric Acid Type A (GABAA) Receptors to Hrd1 Protein-mediated Endoplasmic Reticulum-associated Degradation
(American Society for Biochemistry and Molecular Biology, 2016-03-04)Proteostasis maintenance of γ-aminobutyric acid type A (GABAA) receptors dictates their function in controlling neuronal inhibition in mammalian central nervous systems. However, as a multisubunit, multispan, integral ... -
Endoplasmic reticulum chaperone Gp96 controls actomyosin dynamics and protects against pore-forming toxins
(American Society for Biochemistry and Molecular Biology, 2016-02-12)Heat shock protein 90 (HSP90) is a molecular chaperone that is up-regulated in cancer and is required for the folding of numerous signaling proteins. Consequently, HSP90 represents an ideal target for the development of ... -
The amyloid-beta forming tripeptide cleavage mechanism of γ-secretase
(eLife Sciences Publications, 2016-08-30)γ-secretase is responsible for the proteolysis of amyloid precursor protein (APP) into short, aggregation-prone amyloid-beta (Aβ) peptides, which are centrally implicated in the pathogenesis of Alzheimer’s disease (AD). ... -
The Dlk1-Gtl2 Locus Preserves LT-HSC Function by Inhibiting the PI3K-mTOR Pathway to Restrict Mitochondrial Metabolism
(Elsevier, 2016-02)The mammalian imprinted Dlk1-Gtl2 locus produces multiple non-coding RNAs (ncRNAs) from the maternally inherited allele, including the largest miRNA cluster in the mammalian genome. This locus has characterized functions ... -
Structure-Based Exploration and Exploitation of the S4 Subsite of Norovirus 3CL Protease in the Design of Potent and Permeable Inhibitors
(Elsevier, 2017-01-27)Human noroviruses are the primary cause of epidemic and sporadic acute gastroenteritis. The worldwide high morbidity and mortality associated with norovirus infections, particularly among the elderly, immunocompromised ... -
Novel synthetic inhibitors of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase activity that inhibit tumor cell proliferation and are structurally unrelated to existing statins
(Spandidos Publications, 2009-11)Pilot-scale libraries of eight-membered medium ring lactams (MRLs) and related tricyclic compounds (either seven-membered lactams, thiolactams or amines) were screened for their ability to inhibit the catalytic activity ... -
The discriminative effects of the κ-opioid hallucinogen salvinorin A in nonhuman primates: dissociation from classic hallucinogen effects
(Elsevier, 2010-06)RATIONALE: The widely available hallucinogen salvinorin A is a unique example of a plant-derived compound selective for κ-opioid receptors and may produce effects distinct from those of other compounds with classic ... -
Dose-related Effects of Salvinorin A in Humans: Dissociative, Hallucinogenic, and Memory Effects
(Elsevier, 2013-03)RATIONALE: Salvinorin A is a kappa opioid agonist and the principal psychoactive constituent of the plant Salvia divinorum, which has increased in popularity as a recreational drug over the past decade. Few human studies ... -
Benzylmorpholine Analogs as Selective Inhibitors of Lung Cytochrome P450 2A13 for the Chemoprevention of Lung Cancer in Tobacco Users
(Springer Verlag, 2013-09)PURPOSE 4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), one of the most prevalent and procarcinogenic compounds in tobacco, is bioactivated by respiratory cytochrome P450 (CYP) 2A13, forming DNA adducts and initiating ... -
Antiproliferative withanolides from several Solanaceous species
(Taylor & Francis, 2014-11)To date, our work on Solanaceous species (Datura wrightii, Jaborosa caulescens, Physalis hispida, P. longifolia, Vassobia breviflora, and Withania somnifera) has resulted in the isolation of 65 withanolides, 31 of which ... -
Swe1Wee1-dependent tyrosine phosphorylation of Hsp90 regulates distinct facets of chaperone function
(Elsevier, 2010-02-12)Swe1 (Saccharomyces WEE1), the only “true” tyrosine kinase in budding yeast, is an Hsp90 client protein. Here we show that Swe1Wee1 phosphorylates a conserved tyrosine residue (Y24 in yeast Hsp90 and Y38 in human Hsp90α) ...
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