Author: Jessica.F

Malina, Jaroslav; Kostrhunova, Hana; Scott, Peter; Brabec, Viktor published the artcile< FeII Metallohelices Stabilize DNA G-Quadruplexes and Downregulate the Expression of G-Quadruplex-Regulated Oncogenes>, Recommanded Product: 7H-Purin-2-amine, the main research area is Fe Metallohelices DNA G quadruplexes oncogenes; DNA; G-quadruplexes; metalo-supramolecular helicates; multitargeted agens; oncogenes.

DNA G-quadruplexes (G4s) have been identified within the promoter regions of many proto-oncogenes. Thus, G4s represent attractive targets for cancer therapy, and the design and development of new drugs as G4 binders is a very active field of medicinal chem. Here, mol. biophysics and biol. methods were employed to investigate the interaction of chiral metallohelices with a series of four DNA G4s (hTelo, c-myc, c-kit1, c-kit2) that are formed by the human telomeric sequence (hTelo) and in the promoter regions of c-MYC and c-KIT proto-oncogenes. We show that the investigated water-compatible, optically pure metallohelices, which are made by self-assembly of simple nonpeptidic organic components around FeII ions and exhibit bioactivity emulating the natural systems, bind with high affinity to G4 DNA and much lower affinity to duplex DNA. Notably, both enantiomers of a metallohelix containing a m-xylenyl bridge (5 b) were found to effectively inhibit primer elongation catalyzed by Taq DNA polymerase by stabilizing G4 structures formed in the template strands containing c-myc and c-kit2 G4-forming sequences. Moreover, both enantiomers of 5 b downregulated the expression of c-MYC and c-KIT oncogenes in human embryonic kidney cells at mRNA and protein levels. As metallohelices also bind alternative nucleic acid structures, they hold promise as potential multitargeted drugs.

Chemistry – A European Journal published new progress about Animal gene Role: BSU (Biological Study, Unclassified), PRP (Properties), BIOL (Biological Study) (c-kit1). 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Recommanded Product: 7H-Purin-2-amine.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Xu, Feng; Zhong, Jia-Yu; Lin, Xiao; Shan, Su-Kang; Guo, Bei; Zheng, Ming-Hui; Wang, Yi; Li, Fuxingzi; Cui, Rong-Rong; Wu, Feng; Zhou, En; Liao, Xiao-Bo; Liu, You-Shuo; Yuan, Ling-Qing published the artcile< Melatonin alleviates vascular calcification and ageing through exosomal miR-204/miR-211 cluster in a paracrine manner>, Category: imidazoles-derivatives, the main research area is melatonin vascular calcification ageing paracrine manner exosomal miR cluster; BMP2; ageing; exosomes; melatonin; miR-204/miR-211; vascular calcification.

In the elderly with atherosclerosis, hypertension and diabetes, vascular calcification and ageing are ubiquitous. Melatonin (MT) has been demonstrated to impact the cardiovascular system. In this study, we have shown that MT alleviates vascular calcification and ageing, and the underlying mechanism involved. We found that both osteogenic differentiation and senescence of vascular smooth muscle cells (VSMCs) were attenuated by MT in a MT membrane receptor-dependent manner. Moreover, exosomes isolated from VSMCs or calcifying vascular smooth muscle cells (CVSMCs) treated with MT could be uptaken by VSMCs and attenuated the osteogenic differentiation and senescence of VSMCs or CVSMCs, resp. Moreover, we used conditional medium from MT-treated VSMCs and Transwell assay to confirm exosomes secreted by MT-treated VSMCs attenuated the osteogenic differentiation and senescence of VSMCs through paracrine mechanism. We also found exosomal miR-204/miR-211 mediated the paracrine effect of exosomes secreted by VSMCs. A potential target of these two miRs was revealed to be BMP2. Furthermore, treatment of MT alleviated vascular calcification and ageing in 5/6-nephrectomy plus high-phosphate diet-treated (5/6 NTP) mice, while these effects were partially reversed by GW4869. Exosomes derived from MT-treated VSMCs were internalised into mouse artery detected by in vivo fluorescence image, and these exosomes reduced vascular calcification and ageing of 5/6 NTP mice, but both effects were largely abolished by inhibition of exosomal miR-204 or miR-211. In summary, our present study revealed that exosomes from MT-treated VSMCs could attenuate vascular calcification and ageing in a paracrine manner through an exosomal miR-204/miR-211.

Journal of Pineal Research published new progress about Aging, animal. 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Category: imidazoles-derivatives.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Ouzon-Shubeita, Hala; Schmaltz, Lillian F.; Lee, Seongmin published the artcile< Insights into the substrate discrimination mechanisms of methyl-CpG-binding domain 4>, SDS of cas: 452-06-2, the main research area is methyl CpG binding domain 4 DNA base excision repair; DNA glycosylase; base excision repair; substrate recognition.

G:T mismatches, the major mispairs generated during DNA metabolism, are repaired in part by mismatch-specific DNA glycosylases such as methyl-CpG-binding domain 4 (MBD4) and thymine DNA glycosylase (TDG). Mismatch-specific DNA glycosylases must discriminate the mismatches against million-fold excess correct base pairs. MBD4 efficiently removes thymine opposite guanine but not opposite adenine. Previous studies have revealed that the substrate thymine is flipped out and enters the catalytic site of the enzyme, while the estranged guanine is stabilized by Arg468 of MBD4. To gain further insights into the mismatch discrimination mechanism of MBD4, we assessed the glycosylase activity of MBD4 toward various base pairs. In addition, we determined a crystal structure of MBD4 bound to T:O6-methylguanine-containing DNA, which suggests the O6 and N2 of purine and the O4 of pyrimidine are required to be a substrate for MBD4. To understand the role of the Arg468 finger in catalysis, we evaluated the glycosylase activity of MBD4 mutants, which revealed the guanidinium moiety of Arg468 may play an important role in catalysis. D560N/R468K MBD4 bound to T:G mismatched DNA shows that the side chain amine moiety of the Lys stabilizes the flipped-out thymine by a water-mediated phosphate pinching, while the backbone carbonyl oxygen of the Lys engages in hydrogen bonds with N2 of the estranged guanine. Comparison of various DNA glycosylase structures implies the guanidinium and amine moieties of Arg and Lys, resp., may involve in discriminating between substrate mismatches and nonsubstrate base pairs.

Biochemical Journal published new progress about Animal gene Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (MBD4). 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, SDS of cas: 452-06-2.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Liu, Yi; Zhou, Cuihan; Jiang, Meijing; Arndtsen, Bruce A. published the artcile< Versatile Palladium-Catalyzed Approach to Acyl Fluorides and Carbonylations by Combining Visible Light- and Ligand-Driven Operations>, Formula: C4H5BrN2, the main research area is acyl fluoride preparation; acyl halide carbon monoxide photochem carbonylation palladium catalyst.

The development of a general palladium-catalyzed carbonylative method to synthesize acyl fluorides RC(O)F (R = n-Bu, cyclohexyl, 4-methylphenyl, pyridin-3-yl, etc.) from aryl, heteroaryl, alkyl, and functionalized organic halides RX was described. Mechanistic anal. suggests that the reaction proceeds via the unique, synergistic combination of visible light photoexcitation of Pd(0) to induce oxidative addition with a ligand-favored reductive elimination. These together create a unidirectional catalytic cycle that is uninhibited by the classical effect of carbon monoxide coordination. Coupling the catalytic formation of acyl fluorides with their subsequent nucleophilic reactions has opened a method to perform carbonylation reactions with unprecedented breadth, including the assembly of highly functionalized carbonyl-containing products.

Journal of the American Chemical Society published new progress about Acid fluorides Role: SPN (Synthetic Preparation), PREP (Preparation). 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, Formula: C4H5BrN2.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Subramani, Vinod Kumar; Ravichandran, Subramaniyam; Bansal, Varun; Kim, Kyeong Kyu published the artcile< Chemical-induced formation of BZ-junction with base extrusion>, Recommanded Product: 7H-Purin-2-amine, the main research area is spermine ethanol methanol cobalt sodium perchlorate; 2-Aminopurine; BZ-Junction; Base-extrusion; Z-DNA; Z-DNA junction; Z-inducer.

The crystal structure of BZ-junction reveals that left-handed Z-DNA stabilized by Z-DNA binding domain (Zα) is continuously stacked to right-handed B-DNA with AT bases’ extrusion in the junction site. However, this structure might not fully represent the BZ-junction in solution due to the possibility of the junction formation either by crystal packing or Zα interaction. Therefore, we investigated BZ-junction in solution with chem. Z-DNA inducers using CD and 2-aminopurine base-extrusion assay. We confirmed the formation of Z-DNA and BZ-junction with base-extrusion by chem. Z-DNA inducers. However, neither typical Z-DNA nor base-extrusion could be detected with some inducers such as spermine, suggesting that the energy barrier for the formation of the BZ junction might vary depending on the Z-DNA induction conditions.

Biochemical and Biophysical Research Communications published new progress about Crystal structure. 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Recommanded Product: 7H-Purin-2-amine.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Kerche, Eduardo Fischer; da Silva, Vinicius Demetrio; da Silveira Jankee, Gabriela; Schrekker, Henri Stephan; de Avila Delucis, Rafael; Irulappasamy, Siva; Amico, Sandro Campos published the artcile< Aramid pulp treated with imidazolium ionic liquids as a filler in rigid polyurethane bio-foams>, Reference of 700370-07-6, the main research area is aramid pulp imidazolium ionic liquid filler polyurethane biofoam.

This article reports an aramid pulp (AP) treated with two ionic liquids (IL), namely 1-n-butyl-3-methylimidazolium chloride (C4.Cl) and 1-carboxymethyl-3-methylimidazolium chloride (HO2C), and its use as a filler in reinforced rigid polyurethane foams (RPUF). The RPUF were incorporated with the treated AP at three weight fractions (c.a. 0.1, 0.5, and 1.0 wt%) and were produced by the free rising method. The results showed that the studied IL promoted a better interaction between the AP and the RPUF system, which increased the overall reactivity, imparting a higher cell anisotropy. This also yielded a pos. effect in mech. properties and thermal stability of the RPUF. Compared to the neat RPUF, outstanding increases of approx. 50 and 20% were achieved in compressive modulus and strength, resp. In all, the use of IL promoted increased compatibility between matrix and reinforcement, especially that HO2C IL.

Journal of Applied Polymer Science published new progress about Anisotropy. 700370-07-6 belongs to class imidazoles-derivatives, and the molecular formula is C6H9ClN2O2, Reference of 700370-07-6.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Ansideri, Francesco; Macedo, Joana T.; Eitel, Michael; El-Gokha, Ahmed; Zinad, Dhafer S.; Scarpellini, Camilla; Kudolo, Mark; Schollmeyer, Dieter; Boeckler, Frank M.; Blaum, Baerbel S.; Laufer, Stefan A.; Koch, Pierre published the artcile< Structural Optimization of a Pyridinylimidazole Scaffold: Shifting the Selectivity from p38α Mitogen-Activated Protein Kinase to c-Jun N-Terminal Kinase 3>, Category: imidazoles-derivatives, the main research area is pyridinylimidazole preparation JNK3 inhibitor p38alpha MAP kinase.

Starting from known p38α mitogen-activated protein kinase (MAPK) inhibitors, a series of inhibitors of the c-Jun N-terminal kinase (JNK) 3 was obtained. Altering the substitution pattern of the pyridinylimidazole scaffold proved to be effective in shifting the inhibitory activity from the original target p38α MAPK to the closely related JNK3. In particular, a significant improvement for JNK3 selectivity could be achieved by addressing the hydrophobic region I with a small Me group. Furthermore, addnl. structural modifications permitted to explore structure-activity relationships. The most potent inhibitor 4-(4-methyl-2-(methylthio)-1H-imidazol-5-yl)-N-(4-morpholinophenyl)pyridin-2-amine showed an IC50 value for the JNK3 in the low triple digit nanomolar range and its binding mode was confirmed by x-ray crystallog.

ACS Omega published new progress about Bioactive lead compounds. 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, Category: imidazoles-derivatives.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Bhat, Owais M.; Li, Guangbi; Yuan, Xinxu; Huang, Dandan; Gulbins, Erich; Kukreja, Rakesh C.; Li, Pin-Lan published the artcile< Arterial Medial Calcification through Enhanced small Extracellular Vesicle Release in Smooth Muscle-Specific Asah1 Gene Knockout Mice>, Safety of p-Benzenediacrylanilide, 4′,4′′-di-2-imidazolin-2-yl-, dihydrochloride, the main research area is arterial medial calcification Asah1 small extracellular vesicle smooth muscle.

Arterial medial calcification (AMC) involves an increased small extracellular vesicle (sEV) secretion and apatite calcium precipitation in the arterial wall. The mechanisms mediating AMC remain poorly understood. In the present study, smooth muscle-specific acid ceramidase (Ac) gene knockout mice (Asah1fl/fl/SMCre) were used to demonstrate the role of lysosomal ceramide signaling pathway in AMC. Asah1fl/fl/SMCre mice were found to have more severe AMC in both aorta and coronary arteries compared to their littermates (Asah1fl/fl/SMwt and WT/WT mice) after receiving a high dose vitamin D. These mice also had pronounced upregulation of osteopontin and RUNX2 (osteogenic markers), CD63, AnX2 (sEV markers) and ALP expression (mineralization marker) in the arterial media. In cultured coronary arterial smooth muscle cells (CASMCs) from Asah1fl/fl/SMCre mice, high dose of Pi led to a significantly increased calcium deposition, phenotypic change and sEV secretion compared to WT CASMCs, which was associated with reduced lysosome-multivesicular body (MVB) interaction. Also, GW4869, sEV release inhibitor decreased sEV secretion and calcification in these cells. Lysosomal transient receptor potential mucolipin 1 (TRPML1) channels regulating lysosome interaction with MVBs were found remarkably inhibited in Asah1fl/fl/SMCre CASMCs as shown by GCaMP3 Ca2+ imaging and Port-a-Patch patch clamping of lysosomes. Lysosomal Ac in SMCs controls sEV release by regulating lysosomal TRPML1 channel activity and lysosome-MVB interaction, which importantly contributes to phenotypic transition and AMC.

Scientific Reports published new progress about Animal gene Role: BSU (Biological Study, Unclassified), BIOL (Biological Study) (Asah1). 6823-69-4 belongs to class imidazoles-derivatives, and the molecular formula is C30H30Cl2N6O2, Safety of p-Benzenediacrylanilide, 4′,4′′-di-2-imidazolin-2-yl-, dihydrochloride.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Tan, Ying; You, Changjun; Park, Jiyeong; Kim, Hyun Suk; Guo, Su; Scharer, Orlando D.; Wang, Yinsheng published the artcile< Transcriptional Perturbations of 2,6-Diaminopurine and 2-Aminopurine>, Recommanded Product: 7H-Purin-2-amine, the main research area is transcription diaminopurine aminopurine.

2,6-Diaminopurine (Z) is a naturally occurring adenine (A) analog that bacteriophages employ in place of A in their genetic alphabet. Recent discoveries of biogenesis pathways of Z in bacteriophages have stimulated substantial research interest in this DNA modification. Here, the authors systematically examined the effects of Z on the efficiency and fidelity of DNA transcription. The authors’ results showed that Z exhibited no mutagenic yet substantial inhibitory effects on transcription mediated by purified T7 RNA polymerase and by human RNA polymerase II in HeLa nuclear extracts and in human cells. A structurally related adenine analog, 2-aminopurine (2AP), strongly blocked T7 RNA polymerase but did not impede human RNA polymerase ii in vitro or in human cells, where no mutant transcript could be detected. The lack of mutagenic consequence and the presence of a strong blockage effect of Z on transcription suggest a role of Z in transcriptional regulation. Z is also subjected to removal by transcription-coupled nucleotide-excision repair (TC-NER), but not global-genome NER in human cells. The authors’ findings provide new insight into the effects of Z on transcription and its potential biol. functions.

ACS Chemical Biology published new progress about Homo sapiens. 452-06-2 belongs to class imidazoles-derivatives, and the molecular formula is C5H5N5, Recommanded Product: 7H-Purin-2-amine.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Ohba, Masashi; Mukaihira, Takafumi; Fujii, Tozo published the artcile< Synthesis of 5-arylthio-3-methyl-L-histidine, a model for the starfish alkaloid imbricatine>, Electric Literature of 1003-21-0, the main research area is histidine arylthiomethyl; imbricatine model synthesis.

Syntheses of 3-methyl-5-phenylthio-L-histidine (I, R = Ph) and 3-methyl-5-(1-naphthyl)thio-L-histidine ( R = 1-naphthyl), selected as models for the asteroid alkaloid imbricatine (II), have now become feasible through a 10-step route starting from 4(5)-bromoimidazole. The key steps involve replacement of the 4-bromo group by an arylthio group in the aldehyde III and construction of the L-alanine moiety in the chlorides IV by the “”bis-lactim ether”” method.

Heterocycles published new progress about 1003-21-0. 1003-21-0 belongs to class imidazoles-derivatives, and the molecular formula is C4H5BrN2, Electric Literature of 1003-21-0.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem