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Related Concept Videos

Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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...
Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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...
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:22

Protein Folding

Overview
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Published on: September 23, 2021

Self-recognition by an intrinsically disordered protein.

Oliver Hecht1, Helen Ridley, Ruth Boetzel

  • 1School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich.

FEBS Letters
|June 25, 2008
PubMed
Summary
This summary is machine-generated.

The translocation domain of colicin N, an antibiotic protein, interacts with itself. This self-recognition protects its recognition motifs from degradation, with impaired self-recognition increasing protease susceptibility.

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Area of Science:

  • Molecular Biology
  • Protein Structure and Function
  • Antimicrobial Peptides

Background:

  • Colicin N is a protein antibiotic that targets Escherichia coli.
  • Its translocation domain (T-domain) mediates entry into target cells by binding to periplasmic receptors.
  • Intrinsically disordered proteins pose unique challenges in understanding their function and stability.

Purpose of the Study:

  • To investigate the intramolecular interactions of the T-domain of colicin N.
  • To determine the role of self-recognition in the stability and function of intrinsically disordered domains.
  • To elucidate the mechanism by which the T-domain interacts with the helper protein TolA and folded regions of colicin N.

Main Methods:

  • Analysis of the T-domain of colicin N, focusing on the 27 residues that bind to TolA.
  • Investigating intramolecular interactions between the T-domain and folded regions of colicin N.
  • Assessing the impact of impaired self-recognition on protease susceptibility.

Main Results:

  • The specific 27-residue region of the colicin N T-domain that binds TolA also interacts intramolecularly with folded regions of colicin N.
  • This self-recognition appears to bury hydrophobic recognition motifs within the T-domain.
  • Impaired self-recognition was shown to increase the susceptibility of the T-domain to proteases.

Conclusions:

  • Intrinsically disordered domains can engage in intramolecular self-recognition to protect functional motifs.
  • Self-recognition by the colicin N T-domain enhances its stability against proteolytic degradation.
  • Understanding these interactions is crucial for the development of novel antimicrobial strategies and protein engineering.