A bidirectional acetate kinase that may drive flux through the ethanolamine (EA) degradation pathway under anoxic conditions found when this bacteria infects the host intestine. It may generate ATP that can be used by other enzymes (EutA and EutT) in the eut pathway. Might serve as an assembly hub for bacterial microcompartment (BMC) shell proteins (By similarity). Overexpression in E.coli leads to lamellar structures that inhibit cell division (PubMed:23144756). Expression of the eut operon may allow this bacteria to use EA as a carbon, nitrogen and energy source (Probable). acetate + ATP = acetyl phosphate + ADP Amine and polyamine degradation; ethanolamine degradation. Homodimer (PubMed:23144756). May interact with EutM (By similarity). May be found on the cytoplasmic face of the BMC. Belongs to the EutQ cupin-like family.