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Related Concept Videos

Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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Related Experiment Video

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Analyzing and Building Nucleic Acid Structures with 3DNA
16:24

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

Molecular flexibility in protein-DNA interactions.

Stefan Günther1, Kristian Rother, Cornelius Frömmel

  • 1Institute of Biochemistry Charité, Monbijoustrasse 2, 10117 Berlin, Germany. stefan.guenther@charite.de

Bio Systems
|February 21, 2006
PubMed
Summary
This summary is machine-generated.

DNA-binding proteins exhibit significant structural flexibility before binding. Upon DNA interaction, their binding sites undergo specific conformational changes, supporting the induced fit model, not the lock and key model.

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Area of Science:

  • Structural biology
  • Biochemistry
  • Molecular biology

Background:

  • Protein-DNA interactions are crucial for cellular functions.
  • Understanding these interactions requires analyzing protein structures with and without DNA.

Purpose of the Study:

  • To compare the 3D structures of DNA-binding proteins in unbound and DNA-bound states.
  • To investigate local and global structural changes upon DNA binding.
  • To determine the mechanism of protein-DNA adaptation.

Main Methods:

  • Comparative analysis of 3D structures (backbone traces and binding sites).
  • Pair-wise comparison of related atoms in complexed and uncomplexed proteins.
  • Analysis of conformational changes in protein backbone traces.

Main Results:

  • Unbound DNA-binding sites show high local structural flexibility.
  • DNA binding induces specific, distinct local conformations.
  • Protein adaptation to DNA follows the induced fit model, not lock and key.
  • Five out of seven proteins exhibited backbone conformational changes upon DNA docking.
  • Some unbound structures partially resemble DNA-bound conformations, suggesting a conformational ensemble.

Conclusions:

  • Protein-DNA interactions involve significant conformational flexibility and induced fit.
  • DNA binding restricts the conformational ensemble of proteins to specific states.
  • Different docking models explain the observed structural adaptations.