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Title: Crystal structure of a DNA/Ba2+ G-quadruplex containing a water-mediated C-tetrad

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gku1122· OSTI ID:1251232
 [1];  [2];  [3];  [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. California State Polytechnic Univ., Pomona, CA (United States)
  3. St. John's Univ., Queens, NY (United States)

We have determined the 1.50 Å crystal structure of the DNA decamer, d(CCACNVKGCGTGG) (CNVK, 3-cyanovinylcarbazole), which forms a G-quadruplex structure in the presence of Ba2+. The structure contains several unique features including a bulged nucleotide and the first crystal structure observation of a C-tetrad. The structure reveals that water molecules mediate contacts between the divalent cations and the C-tetrad, allowing Ba2+ ions to occupy adjacent steps in the central ion channel. One ordered Mg2+ facilitates 3'-3' stacking of two quadruplexes in the asymmetric unit, while the bulged nucleotide mediates crystal contacts. Despite the high diffraction limit, the first four nucleotides including the CNVK nucleoside are disordered though they are still involved in crystal packing. This work suggests that the bulky hydrophobic groups may locally influence the formation of non-Watson–Crick structures from otherwise complementary sequences. These observations lead to the intriguing possibility that certain types of DNA damage may act as modulators of G-quadruplex formation.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF)
Grant/Contract Number:
DMR1149665
OSTI ID:
1251232
Journal Information:
Nucleic Acids Research, Vol. 42, Issue 21; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (8)

Mechanically rigid supramolecular assemblies formed from an Fmoc-guanine conjugated peptide nucleic acid journal November 2019
Structure and hydrodynamics of a DNA G-quadruplex with a cytosine bulge journal May 2018
NMR structure of a G-quadruplex formed by four d(G4C2) repeats: insights into structural polymorphism journal October 2018
High-resolution DNA quadruplex structure containing all the A-, G-, C-, T-tetrads journal October 2018
A DNA G-quadruplex/i-motif hybrid posted_content August 2019
A DNA G-quadruplex/i-motif hybrid text January 2019
A DNA G-quadruplex/i-motif hybrid journal November 2019
Quadruplex formation by both G-rich and C-rich DNA strands of theC9orf72(GGGGCC)8•(GGCCCC)8 repeat: effect of CpG methylation journal October 2015

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