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Related Concept Videos

Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
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Click Nucleic Acid-DNA Binding Behavior: Dependence on Length, Sequence, and Ionic Strength.

Heidi R Culver1, Jasmine Sinha1, Tania R Prieto1

  • 1Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States.

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|September 11, 2020
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Summary
This summary is machine-generated.

Click nucleic acids (CNAs) offer stable DNA hybridization, even in high organic solvents. These novel xeno nucleic acids demonstrate sequence specificity and salt-independent stability, paving the way for new applications.

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Oligonucleotide Chemistry

Background:

  • Click nucleic acids (CNAs) are a novel class of xeno nucleic acids (XNA) synthesized via efficient thiol-ene polymerization.
  • CNAs offer a low-cost alternative to traditional nucleic acids for various applications.
  • Understanding CNA hybridization is crucial for their integration into sequence-specific technologies.

Purpose of the Study:

  • To characterize the hybridization of oligo(thymine) CNA with oligo(adenine) DNA ((dA)20).
  • To investigate the impact of sequence, length, and salt concentration on CNA-DNA binding affinity.
  • To evaluate the stability and specificity of CNA-DNA hybrids for potential applications.

Main Methods:

  • Microscale thermophoresis was employed for rapid and systematic analysis of CNA-DNA interactions.
  • Hybridization studies were conducted in aqueous-DMSO mixtures due to CNA solubility limitations.
  • The dissociation constant (Kapp) was measured to quantify binding affinity under varying conditions.

Main Results:

  • CNA-DNA hybrids exhibited remarkable stability in 65% DMSO, with a Kapp of 0.74 ± 0.1 μM, significantly stronger than DNA-DNA hybrids (45 ± 2 μM).
  • CNAs demonstrated excellent sequence specificity, distinguishing single-base-pair mismatches with high affinity (Kapp of 3.7 ± 0.6 μM vs. 0.74 ± 0.1 μM for perfect matches).
  • CNA-DNA hybrid stability increased with CNA length and was independent of salt concentration, unlike traditional DNA duplexes.

Conclusions:

  • CNA-DNA hybridization is highly stable and sequence-specific, even in challenging solvent conditions.
  • The salt-independent nature of CNA-DNA stability broadens their applicability in diverse biological and chemical environments.
  • CNAs represent a promising platform for applications requiring reliable sequence-specific molecular recognition.