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Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

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Molecular dynamic simulation: Structural insights of multi-stranded curdlan in aqueous solution.

Xuan Feng¹, Fan Li², Mingming Ding²

¹State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, PR China.

Carbohydrate Polymers

|March 26, 2021

Summary

Short curdlan molecules prefer a stable, right-handed triple helix structure in water. This conformation is maintained by specific hydrogen bonds, revealing key molecular mechanisms for polysaccharide chain behavior.

Keywords:

Conformation Curdlan Molecular dynamics Triple helix β-(1→3) glucan

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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Published on: November 5, 2018

Area of Science:

Biochemistry
Computational Chemistry
Polymer Science

Background:

Curdlan is a bacterial beta-glucan with potential applications in food and medicine.
Understanding the conformational behavior of short curdlan chains is crucial for its functional properties.
Previous studies have not fully elucidated the microscale structural mechanisms of short curdlan.

Purpose of the Study:

To investigate the molecular mechanisms behind the multi-chain conformational behavior of short curdlan.
To determine the most thermodynamically stable conformation of short curdlan in aqueous solutions.
To explore the influence of chain length and temperature on curdlan's triple helix formation.

Main Methods:

Molecular dynamic (MD) simulations were employed to model curdlan dodecasaccharides.
Simulations initiated with various curdlan conformations to assess stability.
Temperature Replica Exchange Molecular Dynamics (REMD) was used to study temperature effects.

Main Results:

The right-handed triple helix is the most thermodynamically stable conformation for short curdlan in aqueous solutions.
An inter-strand hydrogen bonding network involving C2 hydroxyls stabilizes the triple helix.
Inter-strand hydrogen bonds form a left-handed double helix pattern, contrary to predictions.
Triple helix formation is temperature-sensitive, but the helix itself is stable once formed.
A critical chain length of 6 repeating units was identified for triple helix formation.

Conclusions:

Short curdlan predominantly adopts a stable right-handed triple helix in aqueous environments.
Specific hydrogen bonding patterns dictate the stability and formation of the triple helix.
Chain length significantly influences triple helix formation, with a critical value observed.
These findings provide microscale insights into curdlan's molecular behavior and its structure-property relationships.