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Sequence effects on local DNA topology.

V P Chuprina¹, A A Lipanov, Fedoroff OYu

¹Research Computer Center, U.S.S.R. Academy of Sciences, Pushchino, Moscow Region.

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

|October 15, 1991

Summary

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DNA sequence significantly influences the minor groove width, as measured by Nuclear Overhauser effect (NOE) distances. These findings help predict DNA structure and protein binding interactions.

Area of Science:

Structural Biology
Biophysics
Molecular Biology

Background:

Nuclear Overhauser effect (NOE) provides insights into molecular structure.
DNA duplexes exhibit sequence-dependent structural variations.
The minor groove width is a critical parameter in DNA-protein interactions.

Purpose of the Study:

To investigate the relationship between DNA sequence and minor groove width.
To measure Nuclear Overhauser effect-derived distances between adenine H2 and anomeric H1' protons.
To correlate these distances with DNA minor groove dimensions.

Main Methods:

Utilized Nuclear Overhauser effect (NOE) spectroscopy to derive distance restraints.
Analyzed various DNA duplex sequences.

Related Experiment Videos

Correlated NOE-derived distances with high-resolution X-ray crystallography data of B-type DNA structures.

Main Results:

Cross-strand (n)AH2 to (m+1)H1' distances (x) are sequence-dependent, varying up to 1 Å.
Specific DNA sequence motifs (e.g., pyrimidine-purine, purine-purine steps) significantly impact the 'x' distance.
Same-strand (n)AH2 to (n+1)H1' distances (s) are also sequence-dependent.
The 'x' distance strongly correlates with minor groove width parameters (P-P, H1'-H1').

Conclusions:

Nuclear Overhauser effect-derived distances serve as direct probes of DNA minor groove width.
Sequence-dependent variations in minor groove width are predictable.
These findings are crucial for understanding DNA recognition by proteins and ligands.