The E. coli BolA protein IbaG forms a histidine-ligated [2Fe-2S
Grx4 and IbaG copurify as a [2Fe-2S] cluster bound heterodimer, with spectroscopic properties distinct from the published Grx4 homodimer but similar to the Grx4-BolA heterodimer. 30 In addition, several features of the Grx4-IbaG interaction are comparable to Grx-BolA interactions previously published for the S. cerevisiae, human, …