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Single-Strand DNA Binding Proteins01:03

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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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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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Related Experiment Video

Updated: May 28, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
05:37

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Structural diversity and specific recognition of four stranded G-quadruplex DNA.

M Kaushik1, S Kaushik, A Bansal

  • 1Nucleic Acids Research Laboratory, Department of Chemistry, University of Delhi (North Campus), Delhi 110007, India.

Current Molecular Medicine
|October 18, 2011
PubMed
Summary

G-quadruplexes are four-stranded DNA structures with diverse biological roles, including gene regulation and as anticancer drug targets. Research explores their structure, recognition, and therapeutic potential.

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Published on: March 18, 2017

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Nucleic acids exhibit diverse structures beyond the double helix, including multi-stranded forms.
  • Guanine-rich sequences form G-quadruplexes, four-stranded DNA structures with significant biological implications.
  • G-quadruplexes are found in telomeres and gene promoter regions, suggesting roles in gene expression regulation.

Purpose of the Study:

  • To review the structural polymorphism of G-quadruplexes.
  • To explore their biological relevance and structure-specific recognition.
  • To discuss their potential as drug targets and gene regulatory elements.

Main Methods:

  • Literature review of G-quadruplex research.
  • Analysis of G-quadruplex structures and their interactions.
  • Examination of biological roles and therapeutic applications.

Main Results:

  • G-quadruplexes exhibit remarkable structural diversity and are involved in gene regulation.
  • These structures are implicated in cancer biology, particularly at telomeres.
  • Small molecules and proteins interact with G-quadruplexes, influencing their function.

Conclusions:

  • G-quadruplexes are biologically pertinent structures with significant therapeutic potential, especially in oncology.
  • Understanding G-quadruplex structure-specific recognition is crucial for rational drug design.
  • Further research is needed to overcome challenges in developing G-quadruplex-targeting drugs.