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Loop-length-dependent folding of G-quadruplexes.

Pascale Hazel¹, Julian Huppert, Shankar Balasubramanian

¹Cancer Research UK Biomolecular Structure Group, The School of Pharmacy, University of London, 29-39 Brunswick Square, London WC1N 1AX, UK.

Journal of the American Chemical Society

|December 17, 2004

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DNA quadruplex structures are influenced by loop length. Shorter loops favor parallel structures, while longer loops allow both parallel and antiparallel folds, with multiple conformations likely coexisting.

Area of Science:

Biochemistry
Structural Biology
Computational Chemistry

Background:

Guanine-rich DNA sequences form diverse quadruplex structures.
Quadruplex structures vary in strand polarity, loop composition, and conformation.

Purpose of the Study:

To establish guidelines for predicting intramolecular quadruplex structure based on loop length.
To understand how loop length influences quadruplex folding.

Main Methods:

Experimental techniques: Circular Dichroism (CD) and UV melting.
Computational techniques: Molecular modeling and simulation.

Main Results:

A parallel-stranded intramolecular quadruplex is the sole possible fold with three single-residue loops.

Related Experiment Videos

Both parallel and antiparallel quadruplex structures can form when loops are longer than two residues or include single thymine residues.

Multiple conformations with similar free energies likely coexist in solution.

Conclusions:

Loop length is a critical determinant of DNA quadruplex folding.
Predictive guidelines for DNA quadruplex structure can be derived from loop length analysis.
The coexistence of multiple conformations is a key feature of intramolecular quadruplexes in solution.