Human telomeric

Telomerase is a specialized reverse transcriptase responsible for synthesizing telomeric DNA at the ends of chromosomes. Six subunits composing the telomerase complex have been cloned: hTR (human telomerase RNA), TEP1 (telomerase-associated protein 1), hTERT (human telomerase reverse transcriptase), hsp90 (heat shock protein 90), p23, and dyskerin. In this study, we investigated the role of each the telomerase subunit on the activity of telomerase.

9p research12 01-06-2013 28 3   Download

One of the most drastic post-translational modification of proteins in eu-karyotic cells is poly(ADP-ribosyl)ation, catalysed by a family enzymes termed poly(ADP-ribose) polymerases (PARPs). In the human genome, 18 different genes have been identified that all encode PARP family members.

14p fptmusic 11-04-2013 52 2   Download

The structure of human telomeric DNA is controversial; it depends upon the sequence contexts and the methodologies used to determine it. The solution structure in the presence of K + is particularly interesting, but the structure is yet to be elucidated, due to possible conformational heterogen-eity.

12p galaxyss3 19-03-2013 31 3   Download

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 44 3   Download

Eukaryotic pseudouridine synthases direct RNA pseudouridylation and bind H⁄ACA small nucleolar RNA (snoRNAs), which, in turn, may act as precursors of microRNA-like molecules. In humans, loss of pseudouridine synthase activity causes dyskeratosis congenita (DC), a complex systemic disorder characterized by cancer susceptibility, failures in ribosome biogen-esis and telomere stability, and defects in stem cell formation.

15p viettel02 19-02-2013 39 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

Homologous recombination (HR) serves to eliminate deleterious lesions, such as double-stranded breaks and interstrand crosslinks, from chromosomes. HR is also critical for the preservation of replication forks, for telomere maintenance, and chromosome segregation in meiosis I. As such, HR is indispensable for the maintenance of genome integrity and the avoidance of cancers in humans. The HR reaction is mediated by a conserved class of enzymes termed recombinases.

32p taytrang001 25-12-2012 71 7   Download

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: A balanced transcription between telomerase and the telomeric DNA-binding proteins TRF1, TRF2 and Pot1 in resting, activated, HTLV-1-transformed and Tax-expressing human T lymphocytes

10p toshiba16 26-10-2011 46 4   Download

Telomerase DNA polymerase is unable to replicate the tips of chromosomes, resulting in the loss of DNA at the specialized ends of chromosomes (called telomeres) with each replication cycle. At birth, human telomeres are 15- to 20-kb pairs long and are composed of tandem repeats of a six-nucleotide sequence (TTAGGG) that associate with specialized telomere-binding proteins to form a T-loop structure that protects the ends of chromosomes from being mistakenly recognized as damaged.

5p konheokonmummim 03-12-2010 79 7   Download