V-shaped scaffold: A new architectural motif identified in an A·(G·G·G·G) pentad-containing dimeric DNA quadruplex involving stacked G(anti)·G(anti)·G(anti)·G(syn) tetrads Journal Article
| Authors: | Zhang, N.; Gorin, A.; Majumdar, A.; Kettani, A.; Chernichenko, N.; Skripkin, E.; Patel, D. J. |
| Article Title: | V-shaped scaffold: A new architectural motif identified in an A·(G·G·G·G) pentad-containing dimeric DNA quadruplex involving stacked G(anti)·G(anti)·G(anti)·G(syn) tetrads |
| Abstract: | We report the results of an NMR study of unlabeled and uniformly 13C,15N-labeled d(G3AG2T3G3AT) in 100 mM NaCl, conditions under which it forms a dimeric quadruplex containing several new topological features. The DNA oligomer chain in each symmetry-related monomer subunit undergoes three sharp turns to form a compact domain, with all the purine bases involved in pairing alignments. The first turn is of the double chain reversal type, the second is of the edgewise type, and the third represents a new alignment, the V-shaped type. Each monomer of the dimeric quadruplex contains two stacked G(anti)·G(anti)·G(anti)·G(syn) tetrads, one of which forms a newly identified A·(G·G·G·G) pentad, through sheared G·A mismatch formation. There is a break in one of the four G-G columns that link adjacent G·G·G·G tetrads within each monomer. This architectural interruption is compensated by a new topological feature of quadruplex architecture, the V-shaped scaffold. The missing G-G column results in an opening that could facilitate insertion of planar ligands into the quadruplex. The dimeric interface contains stacked A·(G·G·G·G) pentads, with each pentad containing four bases from one monomer and a syn G1 from the partner monomer. Several potential ligand-binding pockets, positioned towards either end of the folded architecture, were identifiable in a surface view of the solution structure of the dimeric d(G3AG2T3G3AT) quadruplex. © 2001 Academic Press. |
| Keywords: | molecular dynamics; dna; ligand; base sequence; base pairing; hydrogen bond; hydrogen bonding; models, molecular; protons; dimerization; nucleic acid conformation; sodium chloride; ligand binding; nuclear magnetic resonance; monomer; purine; hydrogen; nuclear magnetic resonance, biomolecular; oligomer; nuclear overhauser effect; dimeric quadruplex; priority journal; article; double chain reversal loop; a·(g·g·g·g) pentad; g(anti)·g(anti)·g(anti)·g(syn) tetrads; v-shaped loop and scaffold |
| Journal Title: | Journal of Molecular Biology |
| Volume: | 311 |
| Issue: | 5 |
| ISSN: | 0022-2836 |
| Publisher: | Academic Press Inc., Elsevier Science |
| Date Published: | 2001-08-31 |
| Start Page: | 1063 |
| End Page: | 1079 |
| Language: | English |
| DOI: | 10.1006/jmbi.2001.4916 |
| PUBMED: | 11531340 |
| PROVIDER: | scopus |
| DOI/URL: | |
| Notes: | Export Date: 21 May 2015 -- Source: Scopus |
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