Disulfide Chaperone Knockouts Enable In Vivo Double Spin Labeling of an Outer Membrane Transporter.

ABSTRACT: Recent advances in the application of electron paramagnetic resonance spectroscopy have demonstrated that it is possible to obtain structural information on bacterial outer membrane (OM) proteins in intact cells from extracellularly labeled cysteines. However, in the Escherichia coli OM B₁₂ transport protein, BtuB, the double labeling of many cysteine pairs is not possible in a wild-type K12-derived E. coli strain. It has also not yet been possible to selectively label single or paired cysteines that face the periplasmic space. Here, we demonstrate that the inability to produce reactive cysteine residues in pairs is a result of the disulfide bond formation system, which functions to oxidize pairs of free-cysteine residues. Mutant strains that are dsbA or dsbB null facilitate lab

SUBMITTER: Nilaweera TD 

PROVIDER: S-EPMC6817557 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature