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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
Published on: June 7, 2018
Conformational changes in redox pairs of protein structures
Samuel W Fan1, Richard A George, Naomi L Haworth
1Structural and Computational Biology Program, Victor Chang Cardiac Research Institute, Darlinghurst, New South Wales 2010, Australia.
Emerging evidence suggests proteins have two disulfide subproteomes: structural and redox-active. This study found proteins in alternate redox states exhibit conformational changes, indicating physiological relevance for redox-active disulfides.
Area of Science:
- Biochemistry
- Structural Biology
- Proteomics
Background:
- Disulfide bonds are traditionally viewed as protein structural stabilizers.
- Emerging evidence points to two distinct disulfide subproteomes: structural and redox-active.
- Redox-active disulfides play roles in catalysis and protein function regulation.
Purpose of the Study:
- To identify potentially redox-active cysteine pairs by analyzing protein structures in alternate redox states.
- To investigate conformational changes associated with disulfide redox activity.
Main Methods:
- Scanned the Protein Data Bank (PDB) for protein structures in different redox states.
- Analyzed over 1134 unique redox pairs of proteins for conformational differences.
Main Results:
- Observed significant conformational changes in proteins with alternate redox states.
- Identified classes of structural changes including metal expulsion, backbone reorganization, order/disorder transitions, and quaternary structure alterations.
- Found evidence supporting disulfide redox activity in proteins across different redox states.
Conclusions:
- Proteins exhibiting disulfide bonds in alternate redox states likely possess physiologically relevant redox activity.
- The study supports the existence and functional importance of redox-active disulfide bonds in protein regulation.
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