Quadruplexes

This study examines the characteristics of binding of berberine to the human telomeric d[AG3(T2AG3 )3] quadruplex. By employing UV-visible spectroscopy, fluorescence spectroscopy and isothermal titration calorime-try, we found that the binding affinity of berberine to the human telomeric quadruplex is 10 6 .

13p galaxyss3 07-03-2013 34 3   Download

Naturally occurring G-rich DNA sequences that are able to form G-quad-ruplex structures appear as potential targets for anti-cancer chemotherapy, and therefore play an important role in cellular processes, such as cell aging, death and carcinogenesis.

9p vinaphone15 27-02-2013 45 3   Download

Guanine-rich DNA sequences have the ability to fold into four-stranded structures called G-quadruplexes, and are considered as promising antican-cer targets. Although the G-quadruplex structure is composed of quartets and interspersed loops, in the genome it is also flanked on each side by numerous bases.

13p vinaphone15 25-02-2013 38 3   Download

Homologous recombination is a very important cellular process, as it pro-vides a major pathway for the repair of DNA double-strand breaks. This complex process is affected by many factors within cells. Here, we have studied the effect of monovalent cations (K + ,Na + , and NH4 + ) on the outcome of recombination events, as their presence affects the biochemical activities of the proteins involved in recombination as well as the structure of DNA.

11p viettel02 22-02-2013 39 3   Download

G-quadruplex motifs constitute unusual DNA secondary structures formed by stacking of planar hydrogen-bonded G-tetrads. Recent genome-wide bioinformatics and experimental analyses have suggested the interesting possibility that G-quadruplex motifs could be cis-regulatory elements.

11p viettel02 19-02-2013 26 3   Download

Alternate DNA structures that deviate from B-form double-stranded DNA such as G-quadruplex (G4) DNA can be formed by sequences that are widely distributed throughout the human genome. G-quadruplex secondary structures, formed by the stacking of planar quartets composed of four guanines that interact by Hoogsteen hydrogen bonding, can affect cellular DNA replication and transcription, and influence genomic stability.

19p viettel02 19-02-2013 30 4   Download

The presence and biological importance of DNA secondary structures in eukaryotic promoters are becoming increasingly recognized among chemists and biologists as bioinformatics in vitro and in vivo evidence for these structures in the c-Myc, c-Kit, KRAS, PDGF-A, hTERT, Rb, RET and Hif-1apromoters accumulates.

0p viettel02 19-02-2013 49 3   Download

Four-stranded G-rich DNA structures called G-quadruplexes have been the subject of increasing interest recently. Experimental and computational techniques have been used to implicate them in important biological pro-cesses such as transcription and translation.

7p viettel02 19-02-2013 36 3   Download

Tham khảo luận văn - đề án 'báo cáo khoa học: dna g-quadruplex: structure, function and human disease ´ ´ jaime gomez-marquez', luận văn - báo cáo, báo cáo khoa học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

1p viettel02 19-02-2013 41 3   Download

The innate immune response of insects includes induced expression of genes encoding a variety of antimicrobial peptides. The signaling pathways that stimulate this gene expression have been well characterized by genetic analy-sis in Drosophila melanogaster, but are not well understood in most other insect species.

11p mobifone23 18-01-2013 48 4   Download

Telomeres play an important role in cellular aging and cancer. Human telomeric DNA and RNA G-rich sequences are capable of forming a four-stranded structure, known as the G-quadruplex. Such a structure might be important for telomere biology and a good target for drug design.

8p mobifone23 18-01-2013 42 6   Download

The 3¢-ends of human chromosomal DNA terminate in short single-stranded guanine-rich tandem-repeat sequences. In cancer cells, these are associated with the telomere-maintenance enzyme telomerase together with the end-binding protein hPOT1.

9p mobifone23 18-01-2013 41 5   Download

Thermodynamic and kinetic studies complement high-resolution structures of G-quadruplexes. Such studies are essential for a thorough understanding of the mechanisms that govern quadruplex folding and conformational changes in quadruplexes.

16p mobifone23 18-01-2013 34 5   Download

Over the past few decades, numerous small molecules have been designed to specifically and selectively target the unusual secondary structure in DNA called the G-quadruplex. Because these ligands have been shown to selectively inhibit the growth of cancer cells, they have become a central focus for the development of novel anticancer agents.

20p mobifone23 18-01-2013 34 6   Download