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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
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Dehydrated DNA in B-form: ionic liquids in rescue.
Debostuti Ghoshdastidar1, Sanjib Senapati1
1Department of Biotechnology, BJM School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India.
Nucleic Acids Research
|April 19, 2018
Summary
Ionic liquids can preserve DNA's functional B-conformation, even under dehydration. This discovery offers new methods for DNA storage and controlling DNA structure, preventing the detrimental B-to-A transition.
Area of Science:
- Biochemistry
- Materials Science
- Biophysics
Background:
- DNA's functional B-conformation is lost at low water activity, transitioning to the A-form.
- Anhydrobiotic DNA storage methods often fail due to this B-to-A DNA transition, leading to loss of DNA activity.
Purpose of the Study:
- To investigate the potential of ionic liquids (ILs) in preventing DNA conformational changes under dehydration.
- To explore ILs as a means to maintain DNA's functional B-conformation for storage and applications.
Main Methods:
- Circular Dichroism (CD) spectroscopy to analyze DNA conformational changes.
- Molecular dynamics simulations to understand the interaction between ILs and DNA at a molecular level.
Main Results:
- Ionic liquids induced a rapid transition from A-DNA to B-DNA in ethanol and protected B-DNA from dehydrative A-form transition.
- Molecular dynamics simulations revealed ILs disrupt sodium ion condensation and form an 'IL spine' in the DNA minor groove, driving the A-to-B transition.
Conclusions:
- Ionic liquids can stabilize DNA in the functional B-conformation, even under dehydrating conditions.
- ILs show promise as novel media for anhydrobiotic DNA storage and as switches for modulating DNA conformational transitions.
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