Introduction
E. coli
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Figure 1: bd Oxidase Subunits.
Structure
Subunits
E. coli bd oxidase is made up of four individual subunits. The two major subunits, CydA and CydB, are each composed of one peripheral helix and two bundles of four transmembrane helices. The plays the most important role in the oxygen reduction reaction as it contains the Q-loop as well as all three heme groups. The harbors the ubiquinone molecule which provides structural support to the subunit that mimics the three hemes found in CydA. The remaining two subunits, CydS and CydX, are both single helix structures that assist in the oxygen reduction reaction. Unique to E. coli, the binds to CydA to block oxygen from directly binding to heme b595. The promotes the assembly and stability of the oxidase complex.
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Q Loop
Hemes
Function
Disease
Relevance
Structural highlights
