A component of the bacterial microcompartment (BMC) shell dedicated to ethanolamine degradation. Expression of the eut operon may allow this bacteria to use ethanolamine as a carbon, nitrogen and energy source (Probable). Unlike its S.typhimurium homolog, does not make BMCs when expressed in E.coli (PubMed:23144756). Targets at least 2 proteins (EutC and EutE) to the interior of the BMC (By similarity). Proteins such as EutS containing circularly permuted BMC domains may play a key role in conferring heterogeneity and flexibility in this BMC (Probable). Amine and polyamine degradation; ethanolamine degradation. Homohexamer; unlike its E.coli ortholog the hexamer is flat. Its pore of about 10 Angstroms in diameter is closed in the crystal structure (PubMed:23144756). Interacts with the N-terminus of EutC and of EutE, targeting them to the interior of the BMC (By similarity). Belongs to the EutS/PduU family.