Crystal Structure of a Tetrameric DNA Fold-Back Quadruplex at 1.05 Å Resolution

A 1.05 Å resolution crystal structure describes a DNA oligonucleotide that self-associates into a non-G-quadruplex fold-back structure. Betty Chu from the University of Maryland, College Park authored the research, which reveals a tetrameric assembly formed by two-fold-back dimers interacting through noncanonical and Watson-Crick base pairs. This structure provides new sequence and structural contexts for fold-back quadruplexes and may inform the design of DNA nanoarchitectures or cation sensors.

Use Cases

• Modeling noncanonical DNA interactions based on the described hexad base pairing arrangement.
• Designing DNA-based nanoarchitectures based on the described tetrameric assembly.
• Developing cation sensors based on the strong divalent cation dependence of the structure.
• Studying the biological regulation potential of fold-back quadruplex DNA structures.

Strengths

• High-resolution 1.05 Å crystal structure provides detailed atomic coordinates.
• Describes a novel tetrameric DNA assembly distinct from previously known fold-back quadruplexes.
• Identifies specific structural dependencies, such as the requirement for divalent cations.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.

Provenance

Source

University of Maryland, College Park

Collection Method

X-ray crystallography