AQS2-DNA Complex: X-Ray Structure of a Photochemical Cleavage Agent Bound to DNA

A 1.8 Å resolution X-ray structure of the anthraquinone derivative AQS2 bound to the DNA duplex (d(CGTACG))2, showing an intercalated, groove-reversed complex. The dataset, from Susan M. Gasper of the Georgia Institute of Technology, details guanine-AQS2 interactions and molecular orbital overlap, supporting a model for electron transfer after photoexcitation. The structure reveals two AQS2 molecules intercalated at each CG step, with the out-of-plane swallow tail located in the major groove.

Use Cases

• Modeling DNA intercalation and groove binding based on the described X-ray structure coordinates.
• Studying guanine-selective molecular interactions based on the van der Waals contacts and orbital overlap described.
• Simulating photoinduced electron transfer pathways in DNA based on the ground-state electronic overlap indicated.
• Analyzing base stacking perturbations at intercalation sites based on the description of well-stacked adjacent bases.

Strengths

• High-resolution 1.8 Å X-ray structure provides detailed atomic coordinates.
• Specific binding interactions are described, including intercalation at CG steps and guanine-selective contacts.
• Molecular orbital calculations were performed using the X-ray structure coordinates, confirming electronic overlap.

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

Georgia Institute of Technology, Susan M. Gasper

Collection Method

X-ray crystallography and subsequent molecular orbital calculations.