Abstract:
:Abasic sites are common DNA lesions resulting from spontaneous depurination and excision of damaged nucleobases by DNA repair enzymes. However, the influence of the local sequence context on the structure of the abasic site and ultimately, its recognition and repair, remains elusive. In the present study, duplex DNAs with three different bases (G, C or T) opposite an abasic site have been synthesized in the same sequence context (5'-CCA AAG6 XA8C CGG G-3', where X denotes the abasic site) and characterized by 2D NMR spectroscopy. Studies on a duplex DNA with an A opposite the abasic site in the same sequence has recently been reported [Chen,J., Dupradeau,F.-Y., Case,D.A., Turner,C.J. and Stubbe,J. (2007) Nuclear magnetic resonance structural studies and molecular modeling of duplex DNA containing normal and 4'-oxidized abasic sites. Biochemistry, 46, 3096-3107]. Molecular modeling based on NMR-derived distance and dihedral angle restraints and molecular dynamics calculations have been applied to determine structural models and conformational flexibility of each duplex. The results indicate that all four duplexes adopt an overall B-form conformation with each unpaired base stacked between adjacent bases intrahelically. The conformation around the abasic site is more perturbed when the base opposite to the lesion is a pyrimidine (C or T) than a purine (G or A). In both the former cases, the neighboring base pairs (G6-C21 and A8-T19) are closer to each other than those in B-form DNA. Molecular dynamics simulations reveal that transient H-bond interactions between the unpaired pyrimidine (C20 or T20) and the base 3' to the abasic site play an important role in perturbing the local conformation. These results provide structural insight into the dynamics of abasic sites that are intrinsically modulated by the bases opposite the abasic site.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Chen J,Dupradeau FY,Case DA,Turner CJ,Stubbe Jdoi
10.1093/nar/gkm622subject
Has Abstractpub_date
2008-01-01 00:00:00pages
253-62issue
1eissn
0305-1048issn
1362-4962pii
gkm622journal_volume
36pub_type
杂志文章abstract::A number of different protecting groups were compared with respect to their usefulness for protection of 2'-hydroxyl functions during synthesis of oligoribonucleotides using the H-phosphonate approach. The comparison was between the t-butyldimethylsilyl (t-BDMSi), the o-chlorobenzoyl (o-CIBz), the tetrahydropyranyl (T...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/22.1.94
更新日期:1994-01-11 00:00:00
abstract::We have examined the ability of a cationic planar chromophore, ethidium bromide, to intercalate into a short, defined triple helix. Using UV absorption, fluorescence spectroscopy and a gel retardation assay we demonstrate that ethidium bromide is able to bind to a triple helix with a lower affinity than to the corresp...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/19.7.1521
更新日期:1991-04-11 00:00:00
abstract::Gene-order-based comparison of multiple genomes provides signals for functional analysis of genes and the evolutionary process of genome organization. Gene clusters are regions of co-localized genes on genomes of different species. The rapid increase in sequenced genomes necessitates bioinformatics tools for finding g...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkw843
更新日期:2016-11-16 00:00:00
abstract::The Gene Context Tool (GeConT) allows users to visualize the genomic context of a gene or a group of genes and their orthologous relationships within fully sequenced bacterial genomes. The new version of the server incorporates information from the COG, Pfam and KEGG databases, allowing users to have an integrated gra...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkn330
更新日期:2008-07-01 00:00:00
abstract::Ditercalinium, an antitumor bifunctional intercalator which forms a high affinity reversible complex with DNA, was found to be specifically cytotoxic for polA and lig7 E. coli strains. In the polA strain, the cytotoxic effect of ditercalinium was suppressed by the uvrA mutation. DNA single strand breaks accumulated in...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/16.3.1063
更新日期:1988-02-11 00:00:00
abstract::The influence of an upstream small open reading frame (URF) on the translation of two consecutive coding regions on an eukaryotic mRNA was studied. The cis effects of leader length, URF length, the sequences of the URF and neighboring regions, and the trans effects of the Cauliflower mosaic virus transactivator (TAV) ...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/20.15.3851
更新日期:1992-08-11 00:00:00
abstract::Double-stranded oligonucleotides (ODNs) containing the consensus binding sequence of a transcription factor provide a rationally designed tool to manipulate gene expression at the transcriptional level by the decoy approach. However, modifications introduced into oligonucleotides to increase stability quite often do n...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkh503
更新日期:2004-03-29 00:00:00
abstract::MicroRNAs (miRNAs) can group together along the human genome to form stable secondary structures made of several hairpins hosting miRNAs in their stems. The few known examples of such structures are all involved in cancer development. A large scale computational analysis of human chromosomes crossing sequence analysis...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkt112
更新日期:2013-04-01 00:00:00
abstract::The wobble uridine of certain bacterial and mitochondrial tRNAs is modified, at position 5, through an unknown reaction pathway that utilizes the evolutionarily conserved MnmE and GidA proteins. The resulting modification (a methyluridine derivative) plays a critical role in decoding NNG/A codons and reading frame mai...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkp762
更新日期:2009-11-01 00:00:00
abstract::The solution structure of the complex between 4', 6-diamidino-2-phenylindole (DAPI) and DNA oligomer [d(GCGATTCGC)]2, containing a central T.T mismatch, has been characterized by combined use of proton one- and two-dimensional NMR spectroscopy, molecular mechanics and molecular dynamics computations including relaxati...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/26.20.4706
更新日期:1998-10-15 00:00:00
abstract::We define phosphovariants as genetic variations that change phosphorylation sites or their interacting kinases. Considering the essential role of phosphorylation in protein functions, it is highly likely that phosphovariants change protein functions. Therefore, a comparison of phosphovariants between individuals or be...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkn1008
更新日期:2009-03-01 00:00:00
abstract::Fast viral adaptation and the implication of this rapid evolution in the emergence of several new infectious diseases have turned this issue into a major challenge for various research domains. Indeed, viruses are involved in the development of a wide range of pathologies and understanding how viruses and host cells i...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkq1013
更新日期:2011-01-01 00:00:00
abstract::A modification of previously described methods of electron microscopic gene mapping and of gene enrichment based on the avidin-biotin interaction is presented. The modification consists of coupling cytochrome-c instead of pentane diamine to the oxidized 2', 3' terminus of an RNA by Schiff base formation and BH-4 reduc...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/5.2.385
更新日期:1978-02-01 00:00:00
abstract::Self-cleaving ribozymes associated with the glmS genes of many Gram-positive bacteria are activated by binding to glucosamine-6-phosphate (GlcN6P). Representatives of the glmS ribozyme class function as metabolite-sensing riboswitches whose self-cleavage activities down-regulate the expression of GlmS enzymes that syn...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkl643
更新日期:2006-01-01 00:00:00
abstract::Multicellular organismal development is controlled by a complex network of transcription factors, promoters and enhancers. Although reliable computational and experimental methods exist for enhancer detection, prediction of their target genes remains a major challenge. On the basis of available literature and ChIP-seq...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkq1081
更新日期:2011-04-01 00:00:00
abstract::TRF1, a duplex telomeric DNA-binding protein, plays an important role in telomere metabolism. We have previously reported that a fraction of endogenous TRF1 can stably exist free of telomere chromatin when it is phosphorylated at T371 by Cdk1; however, the role of this telomere-free (pT371)TRF1 has yet to be fully cha...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkt775
更新日期:2013-12-01 00:00:00
abstract::We found previously that the Chlamydomonas HSP70A promoter counteracts transcriptional silencing of downstream promoters in a transgene setting. To elucidate the underlying mechanisms, we analyzed chromatin state and transgene expression in transformants containing HSP70A-RBCS2-ble (AR-ble) constructs harboring deleti...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkt224
更新日期:2013-05-01 00:00:00
abstract::The crp gene of E. coli, which codes for cAMP receptor protein (CRP), has been cloned in the plasmid pBR322 on the basis of a genetic complementation. One of the recombinant plasmids, pHA1, was shown to direct the synthesis of CRP in a cell-free system. The location of the crp gene was determined by constructing subcl...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/10.4.1345
更新日期:1982-02-25 00:00:00
abstract::PRED(BALB/c) is a computational system that predicts peptides binding to the major histocompatibility complex-2 (H2(d)) of the BALB/c mouse, an important laboratory model organism. The predictions include the complete set of H2(d) class I (H2-K(d), H2-L(d) and H2-D(d)) and class II (I-E(d) and I-A(d)) molecules. The p...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gki479
更新日期:2005-07-01 00:00:00
abstract::A 170bp long BamHI-Sau3A DNA fragment from the actIII-actI intergenic region of the actinorhodin (Act) biosynthetic gene cluster of Streptomyces coelicolor A3(2) contains two promoters directing transcription in a divergent manner. One of them, the actIII promoter, is responsible for the transcription of the actIII ge...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/19.10.2623
更新日期:1991-05-25 00:00:00
abstract::Using total internal reflection fluorescence microscopy, we directly visualize in real-time, the 1D Brownian motion and transcription elongation of T7 RNA polymerase along aligned DNA molecules bound to substrates by molecular combing. We fluorescently label T7 RNA polymerase with antibodies and use flow to convect th...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkm332
更新日期:2007-01-01 00:00:00
abstract::Human single-strand (ss) DNA binding proteins 1 (hSSB1) has been shown to participate in DNA damage response and maintenance of genome stability by regulating the initiation of ATM-dependent signaling. ATM phosphorylates hSSB1 and prevents hSSB1 from ubiquitin-proteasome-mediated degradation. However, the E3 ligase th...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gku876
更新日期:2014-10-01 00:00:00
abstract::The isolation of sequences flanking integrated transposable elements is an important step in gene tagging strategies. We have demonstrated that sequences flanking transposons integrated into complex genomes can be simply and rapidly obtained using the polymerase chain reaction. Amplification of such sequences was esta...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/18.11.3271
更新日期:1990-06-11 00:00:00
abstract::Sequential chromatin immunoprecipitation (SeqChIP) is a procedure in which formaldehyde-crosslinked, protein-DNA complexes from living cells are subjected to two sequential immunoprecipitations with antibodies of different specificity. SeqChIP has been used to address, in a qualitative manner, whether two proteins can...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gnh148
更新日期:2004-11-01 00:00:00
abstract::Several restriction endonuclease fragments isolated from highly repetitive satellite DNA of the chromatin eliminating nematode Ascaris lumbricoides var. suum have been cloned. Each type of restriction fragment corresponds to a different variant of the same related ancestral sequence. These variants differ by small del...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/10.23.7493
更新日期:1982-12-11 00:00:00
abstract::Nuclear organization of chromatin is an important level of genome regulation with positional changes of genes occurring during reprogramming. Inherent variability of biological specimens, wide variety of sample preparation and imaging conditions, though pose significant challenges to data analysis and comparison. Here...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkr486
更新日期:2011-09-01 00:00:00
abstract::In this report, we provide an update on the services and content which are available on the web server of IBM's Bioinformatics and Pattern Discovery group. The server, which is operational around the clock, provides access to a large number of methods that have been developed and published by the group's members. Ther...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkh367
更新日期:2004-07-01 00:00:00
abstract::Algae are a diverse, polyphyletic group of photosynthetic eukaryotes spanning nearly all eukaryotic lineages of life and collectively responsible for ∼50% of photosynthesis on Earth. Sequenced algal genomes, critical to understanding their complex biology, are growing in number and require efficient tools for analysis...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkaa898
更新日期:2021-01-08 00:00:00
abstract::Corynebacterium diphtheriae is a Gram-positive, non-spore forming, non-motile, pleomorphic rod belonging to the genus Corynebacterium and the actinomycete group of organisms. The organism produces a potent bacteriophage-encoded protein exotoxin, diphtheria toxin (DT), which causes the symptoms of diphtheria. This pote...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkg874
更新日期:2003-11-15 00:00:00
abstract::Genome editing using clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) predominantly induces non-homologous end joining (NHEJ), which generates random insertions or deletions, whereas homology-directed repair (HDR), which generates precise recombination products, is ...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gky264
更新日期:2018-05-18 00:00:00