Robust IR‐based detection of stable and fractionally populated G‐C+ and A‐T Hoogsteen base pairs in duplex DNA. Issue 12 (19th June 2017)

• Record Type: Journal Article
• Authors: Stelling, Allison L.; Xu, Yu; Zhou, Huiqing; Choi, Seung H.; Clay, Mary C.; Merriman, Dawn K.; Al‐Hashimi, Hashim M.
• Is Part Of: FEBS letters. Volume 591:Issue 12(2017)
• Page Start: 1770
• Page End: 1784
• Publication Date: 2017-06-19
• Subjects: DNA -- Hoogsteen -- infrared -- m1A -- m1G -- NMR; Biochemistry -- Periodicals; Biophysics -- Periodicals; Molecular biology -- Periodicals; Biochimie -- Périodiques; Biochemistry; Biophysics; Molecular biology; Periodicals; 572.05
• DOI: 10.1002/1873-3468.12681
• Languages: English
• ISSNs: 0014-5793

Abstract

Abstract : 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. Abstract :