2M18

Structure of stacked G-quadruplex formed by human TERRA sequence in potassium solution

2M18 の概要

• エントリーDOI: 10.2210/pdb2m18/pdb
• NMR情報: BMRB: 18847
• 分子名称: RNA (5'-R(*GP*GP*GP*UP*UP*AP*GP*GP*GP*U)-3') (1 entity in total)
• 機能のキーワード: rna g-quadruplex, human telomeric rna, stacked g-quadruplex, rna
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 13095.92

構造登録者

Martadinata, H.,Phan, A.T. (登録日: 2012-11-20, 公開日: 2013-04-17, 最終更新日: 2024-05-15)

主引用文献

Martadinata, H.,Phan, A.T.
Structure of Human Telomeric RNA (TERRA): Stacking of Two G-Quadruplex Blocks in K(+) Solution
Biochemistry, 52:2176-2183, 2013

PubMed Abstract: Telomeric repeat-containing RNAs (TERRA) are transcription products of the telomeres. Human TERRA sequences containing UUAGGG repeats can form parallel-stranded G-quadruplexes. The stacking interaction of such structures was shown to be important for ligand targeting and higher-order arrangement of G-quadruplexes in long TERRA sequences. Here we report on the first high-resolution structure of a stacked G-quadruplex formed by the 10-nucleotide human TERRA sequence r(GGGUUAGGGU) in potassium solution. This structure comprises two dimeric three-layer parallel-stranded G-quadruplex blocks, which stack on each other at their 5'-ends. The adenine in each UUA loop is nearly coplanar with the 5'-end G-tetrad forming an A·(G·G·G·G)·A hexad, thereby increasing the stacking contacts between the two blocks. Interestingly, this stacking and loop conformation is different from all structures previously reported for the free human TERRA but resembles the structure previously determined for a complex between a human TERRA sequence and an acridine ligand. This stacking conformation is a potential target for drugs that recognize or induce the stacking interface.

PubMed: 23445442
DOI: 10.1021/bi301606u

実験手法

SOLUTION NMR