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VDNA: the virtual DNA plug-in for VMD.

Thomas C Bishop¹

¹Center for Computational Science, Tulane University, Lindy Boggs Center Suite 500, New Orleans, LA 70118, USA. bishop@tulane.edu

Bioinformatics (Oxford, England)

|October 1, 2009

Summary

This study introduces VDNA, a VMD plugin for coarse-grained DNA modeling using mathematical expressions. It simplifies visualization of complex DNA structures like chromatin and nucleosomes, aiding structural analysis.

Area of Science:

Structural Biology
Computational Biology
Biophysics

Background:

DNA structure is commonly described using inter base pair step parameters (e.g., Twist, Rise).
Visualizing complex DNA conformations beyond simple helices can be challenging.
Existing modeling tools may not intuitively represent intricate DNA structures.

Purpose of the Study:

To develop a novel computational tool for visualizing and modeling complex DNA structures.
To provide an intuitive method for exploring DNA conformations using mathematical expressions.
To enhance the understanding of DNA at various structural levels, from base pairs to chromatin.

Main Methods:

Development of a VMD plugin named VDNA.
Inputting mathematical expressions to define DNA geometry.

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Generation of coarse-grained DNA models based on input parameters.

Implementation of predefined expressions for common DNA structures.

Main Results:

VDNA successfully generates coarse-grained models of DNA from mathematical expressions.
The tool supports visualization of linear, sheared, bent, and circular DNA.
Models for nucleosome superhelix, chromatin, thermal motion, and nucleosome unwrapping are achievable.
VDNA offers a unique approach to DNA modeling and structural analysis.

Conclusions:

VDNA provides a unique and intuitive approach to DNA modeling.
The plugin facilitates the visualization of complex DNA architectures.
This tool can aid researchers in understanding DNA structure-function relationships.