Recombinant E. coli Thiol:disulfide interchange protein dsbG (Tag Free)

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The Thiol:disulfide interchange protein dsbG also called DsbG functions mechanically as a disulfide bond isomerase and chaperone. It facilitates the formation and rearrangement of disulfide bonds in substrate proteins an essential cellular process. DsbG typically has a mass of around 27 kDa. It expresses predominantly in the periplasm of Escherichia coli. As an isomerase DsbG mitigates incorrect disulfide formations ensuring proper protein folding.

Biological function summary

Proteins with disulfide bond isomerase and chaperone activities help maintain protein stability and function under stress conditions. DsbG does not form part of a large complex but interacts closely with substrate proteins needing disulfide rearrangement. Its primary function includes resolving misplaced disulfide linkages thereby aiding in the proper folding and maturation of numerous exported proteins. This activity contributes to protein homeostasis within the bacterial periplasmic space.

Pathways

DsbG plays a significant role in pathways like oxidative protein folding and cellular stress responses. In the oxidative protein folding pathway DsbG collaborates closely with other disulfide isomerases and reductases to ensure efficient protein maturation. This coordination involves proteins like DsbC a related isomerase and DsbA contributing to the redox balance in cells. DsbG helps protect cells from oxidative stress-induced damage by maintaining protein function through correct disulfide arrangement.

Proteins engaging in disulfide bond rearrangements like DsbG hold relevance in conditions caused by defective protein folding such as cystic fibrosis and some bacterial infections. Misfolded proteins play a role in these diseases as faulty protein structures cause functional loss or toxic accumulation. Related proteins like DsbA might also be implicated since they participate in the same oxidative folding and stress response networks. Understanding DsbG's function could inform therapeutic strategies aimed at mitigating protein misfolding-related disorders offering insights into bacterial pathogenicity and resistance management.