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Nucleosides, Nucleotides & Nucleic Acids

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https://www.readbyqxmd.com/read/29337648/simultaneous-amplification-of-exons-18-to-21-of-the-egfr-gene-using-5-tailed-primers-and-a-two-stage-protocol
#1
Kai Luo, Qian Wang, Qinwei Qiu, Xiemengdan Li, Xiaoting Jia, Xiaoliang Chen, Zhijie Zhang, Guopei Zheng, Zhiming He
OBJECTIVE: Reduction of non-specific amplification and achievement of efficient amplification of multiple gene fragments under the same reaction condition is the basic goal of PCR diagnosis; however, this is often difficult. This study was conducted to establish a highly specific and effective amplification of the epidermal growth factor receptor (EGFR) gene's exons, 18-21, simultaneously. METHODS: The 5'-tailed primers were synthesized by adding 10 to 20 bp of a non-specific sequence to the 5'-terminus of sequence-specific primers (tailless primers)...
January 16, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29336691/the-evaluation-of-cr-curcumin-dna-complexation-by-experimental-and-theoretical-approaches
#2
Farhad Ahmadi, Teymour Vahedpour, Ali Akbar Alizadeh
Chromium(III) chloride mediates DNA-DNA cross-linking. Some chromium complexes promote programmed cell death in specific ligand environment through binding to DNA. One strategy that can be supposed for reduction of Cr3+ binding affinity to DNA is using curcumin as a chelator. In the current study, the [Cr(Curcumin)(EtOH)2](NO3)2 (CCC) was synthesized and characterized by UV/Vis, FT-IR, CHN and spectrophotometric titration techniques. The mole ratio plot revealed a 1:1 complex between Cr3+ and curcumin in solution...
January 16, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29336675/synthesis-and-cytotoxic-activity-of-novel-acyclic-nucleoside-analogues-with-functionality-in-click-chemistry
#3
Michał Gładysz, Piotr Ruszkowski, Jan Milecki
We describe synthesis of novel acyclic nucleoside analogues which are building blocks for CuAAC reaction and their activity against two types of human cancer cell lines (HeLa, KB). Three of chosen compounds show promising cytotoxic activity. Synthesis pathway starting from simple and easily accessible substrates employing DMT or TBDPS protective groups is described. Adenosine and thymidine analogues containing alkyne moiety and adenosine analogue containing azido group were synthesized. The obtained units showed ability of forming triazole motif under the CuAAC reaction conditions...
January 16, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29336674/a-facile-synthesis-of-novel-pyrazolopyrimidine-thioglycosides-as-purine-thioglycoside-analogues
#4
Mamdouh A Abu-Zaied, Galal H Elgemeie
The easy, convenient and high yielding preparation of new thioglycosides incorporating mercaptopyrazolo[1,5-a]pyrimidine moieties from readily accessible starting materials has been reported. The main step of this protocol is the formation of 7-mercaptopyrazolo[1,5-a]pyrimidine-6-carbonitrile derivatives 4a-d by condensation of sodium 2-cyano-3-ethoxy-3-oxoprop-1-ene-1,1-bis(thiolate) 1 with 4-(aryldiazenyl)-1H-pyrazole-3,5-diamines 3a-d to form target compounds 4a-d, which coupled with tetra-O-acetyl-α-D-glycopyranosyl bromides 5a,b in the presence of basic medium to provide the corresponding product purine thioglycoside analogs 6a-h...
January 16, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29336673/a-practical-synthesis-of-xylo-and-arabinofuranoside-precursors-by-diastereoselective-reduction-using-corey-bakshi-shibata-catalyst
#5
Lynn M Utley, Jessica Maldonado, Ahmed M Awad
The Corey-Bakshi-Shibata (CBS) catalyst provides an efficient mechanism to reduce ketones and achieve desired enantiopure alcohols. Herein, the diastereoselective reduction of C-2' and C-3'-keto ribofuranoside derivatives to the corresponding arabino- and xylofuranosides in greater than 95% diastereomeric excess is reported. The stereo-directed substitution with an azido group as well as the synthesis of prodrugs cytarabine and vidarabine are also described. The reported strategy offers superior diastereoselectivity, shorter reaction times, and obviates cooling required with comparable protocols involving achiral reductants...
January 16, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29215948/evaluation-of-suitable-dna-regions-for-molecular-identification-of-high-value-medicinal-plants-in-genus-kaempferia
#6
Maslin Osathanunkul, Srisulak Dheeranupattana, Siriphron Rotarayanont, Siriwoot Sookkhee, Khukrit Osathanunkul, Panagiotis Madesis
DNA barcoding coupled high resolution melting (Bar-HRM) is an emerging method for species discrimination based on DNA dissociation kinetics. The aim of this work was to evaluate the suitability of different primer sets, derived from selected DNA regions, for Bar-HRM analysis of species in Kaempferia (Zingiberaceae). Four primer pairs were evaluated (rbcL, rpoC, trnL and ITS1). It was observed that the ITS1 barcode was the most useful DNA barcoding region overall for species discrimination out of all of the regions and primers assessed...
December 7, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29215946/synthesis-of-the-first-novel-pyrazole-thioglycosides-as-deaza-ribavirin-analogues
#7
Mamdouh A Abu-Zaied, Galal H Elgemeie
This study reports a novel and efficient method for the synthesis of the first reported novel class of thiopyrazoles and their corresponding thioglycosides. These series of compounds were designed through the reaction of hydrazine derivatives with sodium dithiolate salt 2 in EtOH at ambient temperature to give the corresponding sodium 5-amino-4-cyano-1H-pyrazole-3-thiolates 4a-d. The latter compounds were treated with α-acetobromoglucose 6a and α-acetobromogalactose 6b in DMF at ambient temperature to give in an excellent yields the corresponding pyrazole S-glycosides 7a-h...
December 7, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29200326/probenecid-directly-impairs-activation-of-the-canine-p2x7-receptor
#8
Rachael Bartlett, Leanne Stokes, Stephen J Curtis, Belinda L Curtis, Ronald Sluyter
The current study aimed to determine if probenecid could directly impair the canine P2X7 receptor, a ligand-gated cation channel activated by extracellular adenosine 5'-triphosphate (ATP). Patch clamp measurements demonstrated that probenecid impairs ATP-induced inward currents in HEK-293 cells expressing canine P2X7. Flow cytometric measurements of ethidium+ uptake into HEK-293 cells expressing canine P2X7 showed that probenecid impairs ATP-induced pore formation in a concentration-dependent manner, with a half maximal inhibitory concentration of 158 µM...
December 4, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185909/the-effects-of-a-neutral-cosolute-on-the-b-to-z-transition-for-dna-duplexes-incorporating-both-cg-and-ca-steps
#9
Pakinee Phromsiri, Rebecca R Gerling, Joshua M Blose
In the cell, nearly 40% of the volume is occupied by macromolecular crowding agents and smaller osmolytes accumulate in response to environmental stresses. Of particular interest is the influence of osmolytes on the transition of the right-handed B-DNA to the left-handed Z-DNA. Due to the correlation between Z-DNA formation potential and regions of active transcription, Z-DNA is believed to serve a vital role in the transcription process, and changes in osmolyte concentration may influence transcription as a part of the stress response...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185900/intercalation-of-a-zn-ii-complex-containing-ciprofloxacin-drug-between-dna-base-pairs
#10
Nahid Shahabadi, Ali Ashraf Asadian, Mryam Mahdavi
In this study, an attempt has been made to study the interaction of a Zn(II) complex containing an antibiotic drug, ciprofloxacin, with calf thymus DNA using spectroscopic methods. It was found that Zn(II) complex could bind with DNA via intercalation mode as evidenced by: hyperchromism in UV-Vis spectrum; these spectral characteristics suggest that the Zn(II) complex interacts with DNA most likely through a mode that involves a stacking interaction between the aromatic chromophore and the base pairs of DNA...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185898/both-enantiomers-of-6-isoneplanocin
#11
Chong Liu, Qi Chen, Stewart W Schneller
Both enantiomers of the isomer of neplanocin where the C-4' hydroxymethyl has been displaced to the 6'-position (that is, 6'-isoneplanocin) have been prepared in 5 steps from known, protected iodocyclopentenones. Both products were evaluated against a number of DNA and RNA viruses and found to be inactive. This observation is suggested to be due to the displacement of the C-4' hydroxymethyl of neplanocin (in the D-like form) away from the lysine425 of S-adenosylhomocysteine hydrolase, which is important for inhibition by neplanocin and, in turn, its antiviral activity...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185863/comparison-of-the-diastereoisomeric-excess-of-uridine-inosine-and-adenosine-cyanohydrins-determined-by-hplc-dad-and-1h-nmr
#12
Rubria Marlen Martínez-Casares, Herminia Inés Pérez Méndez, Norberto Manjarrez Alvarez, Aida Solís Oba, Liliana Hernández Vázquez, Alberto López-Luna
The separation of the diastereoisomers of the nucleoside derivatives of uridine, inosine and adenosine was performed by HPLC using chiral and no chiral columns, it was observed with the no chiral columns the resolution was good enough to determine diastereoisomeric excess. These methods were compared with 1H NMR, and no significant differences were observed between the three techniques. Diastereoisomeric uridine (3a), inosine (3b) and adenosine (4c) cyanohydrins were resolved by 1H nuclear magnetic resonance (1H NMR), chiral normal phase-high-performance liquid chromatography-diode array detector (NP-HPLC-DAD) and reversed phase (RP-HPLC-DAD); these methods allowed the assesment of the percent diastereoisomeric excess (% de) of the nucleosidic cyanohydrins of 3a (4, 6 and 4), 3b (10, 8 and 6) and 4c (4, 4 and 4)...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185860/high-prevalence-of-mouse-mammary-tumor-virus-like-gene-sequences-in-breast-cancer-samples-of-iranian-women
#13
Shervin Shariatpanahi, Najma Farahani, Ahmad Reza Salehi, Rasoul Salehi
Mouse mammary tumor virus (MMTV) is considered to be responsible for breast tumor development in mice. In several instances sequences homologous to the genome of this virus have been reported in human breast cancer samples. Here we aimed to evaluate MMTV involvement in human breast cancer development. DNA was extracted from 118 formalin fixed and paraffin embedded malignant (n = 59) and benign (n = 59) breast lesions. Using two sets of outer and inner MMTV-like envelope specific primers, in a nested PCR setup, MMTV genome was detected in 19 samples out of 59 (%32...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185856/anticancer-antibacterial-and-antifungal-activity-of-new-ni-ii-and-cu-ii-complexes-of-imidazole-phenanthroline-derivatives
#14
Mahboube Eslami Moghadam, Adeleh Divsalar, Marziye Shahraki Zare, Roghayeh Gholizadeh, Doran Mahalleh, Lotfali Saghatforosh, Soheila Sanati
Two new nickel(II) and copper(II) complexes of 2-(Furan-2-yl)-1H-Imidazo[4,5-f][1,10]Phenanthroline (FIP) and 2-(thiophen-2-yl)-1H-imidazo[4,5-f][1,10]phenanthroline (TIP), imidazophen derivatives were synthesized. The structures of the compounds were determined by UV-visible and FT-IR spectroscopic methods and elemental analysis. The biological activities of Ni and Cu complexes, as anticancer agents, were tested against chronic myelogenous leukemia cell line, K562, at micromolar concentration. The MTT studies showed Cc50 values are 21 and 160 µM for Cu and Ni(II) complexes, respectively; suggesting that Ni (II) complex has Cc50 almost seven times of that obtained for cisplatin...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185853/synthesis-characterization-and-biological-evaluation-of-c5-n-cyclopropylcarboxamido-c6-amino-c2-alkynylated-purine-nucleoside-analogues
#15
Arasavelli Ananda Mohan, Ganapavarapu Veera Raghava Sharma, Siddaiah Vidavalur
In an effort to develop potent antibacterial and anticancer agents, a series of C5'-N-cyclopropylcarboxamido-C6-amino-C2-alkynylated purine nucleoside analogues 11a-g were synthesized through a Sonogashira cross-coupling reaction. The nine-step synthesis is easy to perform, and employs commercially available reagents. 2-Iodo-5'-N-cyclopropylcarboxamidoadenosine (9) was used as the starting intermediate for the synthesis of title derivatives 11a-g. Synthetic intermediates (2-9) and final products (11a-g) were appropriately characterized by IR, 1H NMR, 13C NMR and mass spectroscopy...
November 29, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29239699/nucleosides-9-design-and-synthesis-of-new-8-nitro-and-8-amino-xanthine-nucleosides-of-expected-biological-activity
#16
Mosselhi A N M Mohamed, Laila M B Abu-Alola, Nada M G Aljaied
The coupling reaction of 1,3-dimethylxanthine (theophylline), 3-benzylxanthine and 3-benzyl-1-methylxanthine with 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose afforded the corresponding protected nucleosides, respectively. Nitration of each of the theophylline and 3-benzy-1-methyllxanthine protected nucleosides yielded the corresponding 8-nitronucleosides derivatives, which were reduced to give the corresponding 8-aminonucleoside derivatives. Debenzoylation of protected nucleosides formed by using methanolic sodium methoxide afforded the corresponding free N-nucleosides, respectively...
December 2, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29239698/editorial-board-page-eov
#17
(no author information available yet)
No abstract text is available yet for this article.
December 2, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29185864/novel-mutation-in-the-human-hprt1-gene-and-the-lesch-nyhan-disease
#18
Khue Vu Nguyen, Robert K Naviaux, William L Nyhan
Lesch-Nyhan disease (LND) is a rare X-linked inherited neurogenetic disorder of purine metabolism in which the enzyme, hypoxanthine-guanine phosphoribosyltransferase (HGprt) is defective. The authors report a novel point mutation that led to HGprt-related neurological dysfunction (HND) in a family in which there was a missense mutation in exon 6 of the coding region of the HPRT1 gene: g.34938G>T, c.403G>T, p.D135Y. Molecular diagnosis is consistent with the genetic heterogeneity of the HPRT1 gene responsible for HGprt deficiency...
November 2, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29087802/syntheses-of-1-2-3-triazole-bridged-pyranose-sugars-with-purine-and-pyrimidine-nucleobases-and-evaluation-of-their-anticancer-potential
#19
Erkan Halay, Emriye Ay, Emine Şalva, Kadir Ay, Tamer Karayıldırım
With the aim to create a library of compounds with potential bioactivities by combining special characteristics of two important groups such as nucleobases and carbohydrates, twenty 1,4-disubstituted-triazole nucleosides were synthesized in good yields (80-94%) using the copper catalyzed 'Click' reaction between azido-modified pento- or hexopyranoses and alkyne-bearing pyrimidine or purine nucleobases. Structural elucidation was made with the assistance of spectroscopic techniques such as FTIR, 1D-, 2D-NMR, and ESI-TOFMS...
September 2, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29035162/effects-of-osmolytes-on-stable-uucg-tetraloops-and-their-preference-for-a-cg-closing-base-pair
#20
Michelle E Whittum, Joshua M Blose
Osmolytes have the potential to affect the stability of secondary structure motifs and alter preferences for conserved nucleic acid sequences in the cell. To contribute to the understanding of the in vivo function of RNA we observed the effects of different classes of osmolytes on the UNCG tetraloop motif. UNCG tetraloops are the most common and stable of the RNA tetraloops and are nucleation sites for RNA folding. They also have a significant thermodynamic preference for a CG closing base pair. The thermal denaturation of model hairpins containing UUCG loops was monitored using UV-Vis spectroscopy in the presence of osmolytes with different chemical properties...
September 2, 2017: Nucleosides, Nucleotides & Nucleic Acids
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