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Transport systems frequently include auxiliary proteins that perform subfunctions within the transporter protein complex. Two such proteins found in Gram-negative bacteria are the Membrane Fusion Proteins (MFPs) and the Outer Membrane Auxiliary (OMA) proteins. We here demonstrate that OMAs present in  α -proteobacteria (but not in other bacterial types) contain a long  α -helical region that is homologous to corresponding regions in the MFPs. The results suggest that during their evolution, OMAs, specifically from  α -proteobacteria, exchanged their own  α -helical domain for one derived from an MFP. The structural and functional implications of these findings are discussed.

international journal of microbiology

Bacterial Adaptor Membrane Fusion Proteins and the Structurally Dissimilar Outer Membrane Auxiliary Proteins Have Exchanged Central Domains in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math>-Proteobacteria

Bacterial Adaptor Membrane Fusion Proteins and the Structurally Dissimilar Outer Membrane Auxiliary Proteins Have Exchanged Central Domains inα-Proteobacteria