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Related Concept Videos

Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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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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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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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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Nucleosome Remodeling02:54

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Related Experiment Video

Updated: Apr 11, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Movement and specificity in a modular DNA binding protein.

Cary Liptak1, J Patrick Loria2

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.

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Replication protein A (RPA) binds single-stranded DNA (ssDNA) to protect it and recruit repair proteins. RPA

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Area of Science:

  • Molecular Biology
  • Genomics
  • Structural Biology

Background:

  • The single-stranded DNA (ssDNA) binding protein RPA is crucial for genome maintenance.
  • RPA binds and protects ssDNA, recruiting essential replication and repair proteins.

Purpose of the Study:

  • To investigate how ssDNA binding affects the flexibility and domain interactions of RPA.
  • To understand the structural basis for RPA's diverse functions in DNA replication and repair.

Main Methods:

  • The study likely employed structural biology techniques (e.g., X-ray crystallography, NMR spectroscopy) to analyze RPA-ssDNA complexes.
  • Computational modeling may have been used to assess domain flexibility and interactions.

Main Results:

  • ssDNA binding alters the flexibility and inter-domain interactions of RPA.
  • These configurational changes are suggested to be critical for RPA's recruitment of other proteins.

Conclusions:

  • RPA's modular domain structure allows for dynamic conformational changes upon ssDNA binding.
  • These changes are fundamental to RPA's multifaceted roles in genome integrity.