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Related Concept Videos

Bacterial Protein Maturation01:26

Bacterial Protein Maturation

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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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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.
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

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Updated: Apr 19, 2026

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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Activation of RidA chaperone function by N-chlorination.

Alexandra Müller1, Sina Langklotz2, Nataliya Lupilova1

  • 1Institute of Biochemistry and Pathobiochemistry-Microbial Biochemistry, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany.

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Escherichia coli RidA becomes an effective chaperone when modified by HOCl. This reversible N-chlorination protects cytosolic proteins during oxidative stress, independent of cysteine modification.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oxidative Stress Response

Background:

  • Escherichia coli RidA belongs to a diverse protein family with varied functions, including translation inhibition and chaperone activity.
  • Oxidative stress can damage cellular proteins, necessitating protective mechanisms.
  • Post-translational modifications can alter protein function and cellular roles.

Purpose of the Study:

  • To investigate the role of HOCl modification on E. coli RidA function.
  • To elucidate the mechanism by which HOCl affects RidA activity.
  • To determine the physiological significance of HOCl-modified RidA in cellular protection.

Main Methods:

  • Treatment of E. coli RidA with hypochlorous acid (HOCl) and chloramines.
  • Analysis of amino group content and protein hydrophobicity.
  • Chaperone activity assays using unfolded cytosolic proteins.
  • Phenotypic analysis of ridA deletion mutants under oxidative stress.

Main Results:

  • HOCl treatment reversibly activates E. coli RidA as a chaperone, independent of cysteine modification.
  • HOCl induces N-chlorination of positively charged residues, increasing RidA hydrophobicity and promoting binding to unfolded proteins.
  • ridA deletion mutants exhibit increased sensitivity to HOCl-induced oxidative stress.

Conclusions:

  • HOCl-mediated N-chlorination is a cysteine-independent post-translational modification that converts RidA into an effective chaperone holdase.
  • This modification plays a crucial role in protecting cytosolic proteins during oxidative stress.
  • RidA acts as a key component of the cellular defense against oxidative damage.