Robust IR-based detection of stable and fractionally populated G-C+ and A-T Hoogsteen base pairs in duplex DNA.

Journal Article (Journal Article)

Noncanonical G-C+ and A-T Hoogsteen base pairs can form in duplex DNA and play roles in recognition, damage repair, and replication. Identifying Hoogsteen base pairs in DNA duplexes remains challenging due to difficulties in resolving syn versus antipurine bases with X-ray crystallography; and size limitations and line broadening can make them difficult to characterize by NMR spectroscopy. Here, we show how infrared (IR) spectroscopy can identify G-C+ and A-T Hoogsteen base pairs in duplex DNA across a range of different structural contexts. The utility of IR-based detection of Hoogsteen base pairs is demonstrated by characterizing the first example of adjacent A-T and G-C+ Hoogsteen base pairs in a DNA duplex where severe broadening complicates detection with NMR.

Full Text

Duke Authors

Cited Authors

  • Stelling, AL; Xu, Y; Zhou, H; Choi, SH; Clay, MC; Merriman, DK; Al-Hashimi, HM

Published Date

  • June 2017

Published In

Volume / Issue

  • 591 / 12

Start / End Page

  • 1770 - 1784

PubMed ID

  • 28524232

Pubmed Central ID

  • PMC5584567

Electronic International Standard Serial Number (EISSN)

  • 1873-3468

Digital Object Identifier (DOI)

  • 10.1002/1873-3468.12681


  • eng

Conference Location

  • England