Volume 58, Issue 8 pp. 2331-2335
Communication

A Minimal Sequence for Left-Handed G-Quadruplex Formation

Blaž Bakalar

Blaž Bakalar

School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore

School of Biological Sciences, Nanyang Technological University, Singapore, 637551 Singapore

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Dr. Brahim Heddi

Dr. Brahim Heddi

School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore

Laboratoire de Biologie et Pharmacologie Appliquée, CNRS, Ecole Normale Supérieure Paris-Saclay, 94235 Cachan, France

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Dr. Emmanuelle Schmitt

Dr. Emmanuelle Schmitt

Laboratoire de Biochimie, UMR 7654, CNRS, Ecole Polytechnique, 91128 Palaiseau, France

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Dr. Yves Mechulam

Dr. Yves Mechulam

Laboratoire de Biochimie, UMR 7654, CNRS, Ecole Polytechnique, 91128 Palaiseau, France

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Prof. Dr. Anh Tuân Phan

Corresponding Author

Prof. Dr. Anh Tuân Phan

School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore

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First published: 27 November 2018
Citations: 43

Graphical Abstract

It's just a jump to the left: Based on analysis and modification of the two sequence blocks of the natural left-handed DNA G-quadruplex Z-G4, the 12-nt sequence GTGGTGGTGGTG was identified as a minimal sequence motif for left-handed G-quadruplex formation. This motif is abundant in the human genome.

Abstract

Recently, we observed the first example of a left-handed G-quadruplex structure formed by natural DNA, named Z-G4. We analysed the Z-G4 structure and inspected its primary 28-nt sequence in order to identify motifs that convey the unique left-handed twist. Using circular dichroism spectroscopy, NMR spectroscopy, and X-ray crystallography, we revealed a minimal sequence motif of 12 nt (GTGGTGGTGGTG) for formation of the left-handed DNA G-quadruplex, which is found to be highly abundant in the human genome. A systematic analysis of thymine loop mutations revealed a moderate sequence tolerance, which would further broaden the space of sequences prone to left-handed G-quadruplex formation.

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