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Internal motions in DNA.

M E Hogan, O Jardetzky

Proceedings of the National Academy of Sciences of the United States of America

|December 1, 1979

Summary

This summary is machine-generated.

Nuclear Magnetic Resonance (NMR) reveals significant fluctuations in DNA

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Area of Science:

Molecular Biophysics
Structural Biology
Biochemistry

Background:

Understanding DNA dynamics is crucial for gene regulation and replication.
Previous studies have explored DNA flexibility, but precise measurements of backbone motion remain challenging.

Purpose of the Study:

To quantify the dynamic motions of the deoxyribose and sugar-phosphate backbone in double-stranded DNA fragments.
To determine the time scale of these coupled motions within the intact DNA double helix.

Main Methods:

Utilized 31P and 1H Nuclear Magnetic Resonance (NMR) spectroscopy.
Analyzed fractionated double-stranded DNA fragments of varying lengths (600, 300, and 150 base pairs).

Main Results:

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Observed substantial fluctuations of both the deoxyribose sugar and the sugar-phosphate backbone from their equilibrium positions.

Determined that these coupled motions occur on a time scale of approximately 1 nanosecond.

Conclusions:

The DNA double helix exhibits significant internal flexibility at the molecular level.
These dynamic motions of the DNA backbone are rapid, occurring on the nanosecond timescale, and are integral to DNA structure and function.