Abstract:
:To aid the pharmaceutical and cosmetic industry in the development of alternatives to prevent melanin-related hyperpigmentation disorders, the plant Dalea elegans was submitted to fractionation with the aim of obtaining its anti-tyrosinase principle. Bioguided fractionation of D. elegans led to the isolation of 5,2',4'-trihydroxy-2″,2″-dimethylchromene-(6,7:5″,6″)-flavanone (1) as the active compound. This novel flavanone, named as dalenin, showed notable activity at inhibiting tyrosinase using l-tyrosine or l-DOPA as substrates with IC(50) values of 0.26 and 18.61 μM, respectively. This meant that the flavanone was 52 and 495 times more effective as a monophenolase inhibitor than hydroquinone and kojic acid, respectively. With l-DOPA as a substrate, compound 1 showed itself 59 times more effective at inhibiting the enzyme than hydroquinone and showed the same level of effectiveness as that of kojic acid. It was found that the flavanone behaved as a reversible inhibitor of the enzyme and that it was a mixed-I type or a non-competitive inhibitor with l-tyrosine or l-DOPA as substrates, respectively. Molecular modeling studies were conducted confirming the inhibitory potency of dalenin and showing that the 2',4'-dihydroxy substituents are important for the interaction with the enzyme. The results suggest that compound 1 has great potential to be further developed as a pharmaceutical and cosmetic agent for use in dermatological disorders associated with melanin.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Chiari ME,Vera DM,Palacios SM,Carpinella MCdoi
10.1016/j.bmc.2011.04.025subject
Has Abstractpub_date
2011-06-01 00:00:00pages
3474-82issue
11eissn
0968-0896issn
1464-3391pii
S0968-0896(11)00293-8journal_volume
19pub_type
杂志文章abstract::Various estrogen analogs were synthesized and tested for binding to human ERα using a fluorescence polarization displacement assay. Binding affinity and orientation were also predicted using docking calculations. Docking was able to accurately predict relative binding affinity and orientation for estradiol, but only i...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2013.11.024
更新日期:2014-01-01 00:00:00
abstract::2-Amino-6-fluoro-9-(4-hydroxy-3-hydroxymethylbut-1-yl)purine (7), and its mono- and diesters 8-15 were prepared and evaluated for their potential as prodrugs of penciclovir. Treatment of 2-amino-6-chloro-9-(4-hydroxy-3-hydroxymethylbut-1-yl)purine (5) with trimethylamine in THF followed by a reaction of the resulting ...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/s0968-0896(98)00263-6
更新日期:1999-03-01 00:00:00
abstract::The substitution of the sterically hindered carbon of the potent thyroid hormone agonist, GC-1, was effected by a reaction based on the solvolysis of the benzylic hydroxyl group. The reaction was found to proceed in high yield with a variety of nucleophiles including alcohols, thiols, allyl silanes and electron-rich a...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/s0968-0896(98)00085-6
更新日期:1998-08-01 00:00:00
abstract::We investigated the catalytic activity and inhibition of the β-class carbonic anhydrase (CA, EC 4.2.1.1) CahB1, from the relict cyanobacterium Coleofasciculus chthonoplastes (previously denominated Microcoleus chthonoplastes). The enzyme showed good activity as a catalyst for the CO2 hydration, with a kcat of 2.4 × 10...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2014.01.026
更新日期:2014-03-01 00:00:00
abstract::Systematic replacement in the 3- or 4-position of the pyrrolidine ring at P1' proline was carried out. Compound 26, which has a Cl atom in the 4(S)-position was the most active among inhibitors substituted with other halogen atoms or other substituents. Furthermore, the replacement of the Z group in compound 26 with f...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/0968-0896(96)00130-7
更新日期:1996-08-01 00:00:00
abstract::3-Metoxycarbonyl isoquinolone derivative 1 has been identified as a potent JNK inhibitor and significantly inhibited cardiac hypertrophy in a rat pressure-overload model. Herein, a series of isoquinolones with an imidazolylmethyl or a pyrazolylmethyl group at the 2-position were designed based on X-ray crystallographi...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2008.02.028
更新日期:2008-04-15 00:00:00
abstract::Protein-protein interfaces are prominent in many therapeutically important targets. Using small organic molecules to disrupt protein-protein interactions is a current challenge in chemical biology. An important example of protein-protein interactions is provided by the Myc protein, which is frequently deregulated in h...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2005.11.052
更新日期:2006-04-15 00:00:00
abstract::The phosphate, uracil, and ribose moieties of uracil nucleotides were varied structurally for evaluation of agonist activity at the human P2Y(2), P2Y(4), and P2Y(6) receptors. The 2-thio modification, found previously to enhance P2Y(2) receptor potency, could be combined with other favorable modifications to produce n...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2008.05.013
更新日期:2008-06-15 00:00:00
abstract::On the grounds of previous encouraging results on the antitumor activity of (1E,3E)-1,4-bis(1-naphthyl)-2,3-dinitro-1,3-butadiene (1), we have designed and synthesized two new molecules [(1E,3E)-1,4-bis(4-carboxy-1-naphthyl)-2,3-dinitro-1,3-butadiene (2) and methyl (2Z,4E)-2-methylsulfanyl-5-(1-naphthyl)-4-nitro-2,4-p...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2007.09.042
更新日期:2008-01-01 00:00:00
abstract::Small molecules are central players in chemical biology studies. They promote the perturbation of cellular processes underlying diseases and enable the identification of biological targets that can be validated for therapeutic intervention. Small molecules have been shown to accurately tune a single function of plurip...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章,评审
doi:10.1016/j.bmc.2014.04.019
更新日期:2014-08-15 00:00:00
abstract::A linear quantitative structure-activity relationship (QSAR) model is presented for modeling and predicting induction of apoptosis by 4-aryl-4H-chromenes. The model was produced by using the multiple linear regression (MLR) technique on a database that consists of 43 recently discovered 4-aryl-4H-chromenes. Among the ...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2006.05.061
更新日期:2006-10-01 00:00:00
abstract::Three carboranyltetraphenylporphyrins containing 40 or 80 boron atoms were synthesized and evaluated for their biodistribution and toxicity in EMT-6 tumor-bearing mice. Copper (II) meso-5,10,15,20-tetrakis[3-methoxy-4-(o-carboranylmethoxy)phenyl]porphyrin, 6, and copper (II) meso-5,10,15,20-tetrakis[3-hydroxy-4-(o-car...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2006.04.010
更新日期:2006-08-01 00:00:00
abstract::c-MET-positive NSCLC is an important subtype accounting for about 5%~22% of lung cancer. NSCLC patients with activating c-MET are intensively sensitive to c-MET selective receptor tyrosine kinase (RTK) inhibitors, so we aimed to develop a specific PET probe targeting to c-MET-positive NSCLC for potential patients scre...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2020.115577
更新日期:2020-08-01 00:00:00
abstract::Activity-based probes (ABPs) have found increasing use in functional proteomics studies. Recently, ABPs that can be employed in combination with click chemistry gained particular attention due to their flexible application in vitro and in vivo. Moreover, there is a continuous need for new ABPs that target small subset...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2011.03.014
更新日期:2012-01-15 00:00:00
abstract::A series of novel combretastatin-A4 analogues in which the cis-olefinic bridge is replaced by an imidazolone-amide were synthesized, and their cytotoxicity and tubulin-polymerization inhibitory activities were evaluated. These compounds appear to be potential tubulin-polymerization inhibitors. Compounds 10, 9b and 9c,...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2011.03.068
更新日期:2011-06-01 00:00:00
abstract::We synthesized modified 2'-deoxyuridine triphosphates bearing amino acids at the C5 position and investigated their substrate properties for KOD Dash DNA polymerase during polymerase chain reaction (PCR). PCR using C5-modified dUTP having an amino acyl group (arginyl, histidyl, lysyl, phenylalanyl, tryptophanyl, leucy...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2005.11.030
更新日期:2006-04-15 00:00:00
abstract::The biochemistry of all living organisms uses complex, enzyme-catalyzed metabolic reaction networks. Yet, at life's origins, enzymes had not yet evolved. Therefore, it has been postulated that non-enzymatic metabolic pathways predated their enzymatic counterparts. In this account article, we describe our recent work t...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章,评审
doi:10.1016/j.bmc.2019.03.012
更新日期:2019-06-15 00:00:00
abstract::4-Oxalocrotonate tautomerase (4-OT) catalyzes the isomerization of 4-oxalocrotonate, 1, to 2-oxo-3E-hexenedioate, 3, using a general acid/base mechanism that involves a conserved N-terminal proline residue. The P1A and P1G mutants have been shown to catalyze this isomerization but at reduced rates. Analysis of these m...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/s0968-0896(02)00385-1
更新日期:2002-12-01 00:00:00
abstract::Based on two lead cytotoxic spongiane diterpenes, a new series of C7-oxygenated derivatives were synthesized and evaluated for their antitumor activity in vitro against the cancer cell lines HeLa and HEp-2. In general, introduction of either hydroxyl or acetoxy groups at C-7 did not improve the resultant cytotoxicity,...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/s0968-0896(03)00230-x
更新日期:2003-07-17 00:00:00
abstract::Two series of combretastatin A4 derivatives (acrylamide=carboxamide and carbamate) were synthesized in order to improve the water solubility and stabilize the cis-configuration of the double bond. Their cytotoxic effects were evaluated against MCF-7, KB-3-1 and IGROV human cancer cell lines, as well as their inhibitor...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2005.02.039
更新日期:2005-06-01 00:00:00
abstract::The kainoids are a class of excitatory and excitotoxic pyrrolidine dicarboxylates that act at ionotropic glutamate receptors. The kainoids bind kainate receptors with high affinity and, while binding affinity is lower at AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) receptors, they are active in func...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/s0968-0896(02)00448-0
更新日期:2003-02-20 00:00:00
abstract::This study aimed to investigate the relationships between structures of gene carrier molecules and their activities for gene delivery into cells. We compared 2 types of poly(L-lysine) as carriers, that is, dendritic poly(L-lysine) (KG6) and linear poly(L-lysine) (PLL). KG6 formed a neutral DNA complex, and its DNA com...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2006.09.033
更新日期:2007-01-01 00:00:00
abstract::To establish the role of the ferrocenyl moiety in the antiplasmodial activity of ferroquine, compounds in which this moiety is replaced by the corresponding ruthenium-based moieties were synthesized and evaluated. In both the sensitive (D10) and resistant (K1) strains of Plasmodium falciparum, ruthenoquine analogues s...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2007.07.012
更新日期:2007-10-15 00:00:00
abstract::Conflicts with the notion that specific substrate interactions were required in the control of reaction path in active transport systems, P-glycoprotein showed extraordinarily low specificity. Therefore, overexpression P-glycoprotein excluded a large number of anticancer agents from cancer cells, and multidrug resista...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2020.115553
更新日期:2020-06-15 00:00:00
abstract::The series of des-Cl (unsubstituted) and m-Cl phenyl analogues of PYR with various flexible 6-substituents were synthesized and studied for the binding affinities with highly resistant quadruple mutant (QM) DHFR. The derivatives carrying 4 atoms linker with a terminal carboxyl substituted on the aromatic ring exhibite...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2019.115158
更新日期:2019-12-15 00:00:00
abstract::A series of 16 1-phenyl-1H-1,2,3-triazoles with substituents at both the 4- and 5-positions of the triazole ring were synthesized, and a total of 49 compounds, including previously reported 4- or 5-monosubstituted analogues, were examined for their ability to inhibit the specific binding of [(3)H]4'-ethynyl-4-n-propyl...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2007.05.039
更新日期:2007-08-01 00:00:00
abstract::Twelve optically pure enantiomers were obtained using either crystallization or chiral high performance liquid chromatography (HPLC) separation methodologies to resolve six racemic sigma-1 (σ1) receptor ligands. The in vitro binding affinities of each enantiomer for σ1, σ2 receptors and vesicular acetylcholine transpo...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2017.01.017
更新日期:2017-02-15 00:00:00
abstract::Cancer is a major cause of death, and the development of new anticancer drugs is urgently needed. Invasion and metastasis are the primary causes of death due to cancer rather than growth of the primary tumor. In the current study, we examined the anti-invasive effects of p-dodecylaminophenol (1), which was developed b...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2013.07.039
更新日期:2013-10-01 00:00:00
abstract::A series of 2-amino-4,5,6,7-tetrahydrothieno[2,3-c]pyridines were prepared and evaluated as potential allosteric modulators at the A(1) adenosine receptor. The structure-activity relationships of the 3- and 6-positions of a series of 2-amino-4,5,6,7-tetrahydrothieno[2,3-c]pyridines were explored. Despite finding that ...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2009.08.024
更新日期:2009-10-15 00:00:00
abstract::Tankyrases-1 and -2 (TNKS-1 and TNKS-2) have three cellular roles which make them important targets in cancer. Using NAD(+) as a substrate, they poly(ADP-ribosyl)ate TRF1 (regulating lengths of telomeres), NuMA (facilitating mitosis) and axin (in wnt/β-catenin signalling). Using molecular modelling and the structure o...
journal_title:Bioorganic & medicinal chemistry
pub_type: 杂志文章
doi:10.1016/j.bmc.2015.06.061
更新日期:2015-09-01 00:00:00