This domain is found towards the C-terminal region of various aldolase enzymes. It consists of five alpha-helices, four of which form an antiparallel helical bundle that plugs the C-terminus of the N-terminal TIM barrel domain [1]. The communication domain is thought to play an important role in the heterodimerisation of the enzyme [1].

1: Crystal structure of a bifunctional aldolase-dehydrogenase: sequestering a reactive and volatile intermediate. Manjasetty BA, Powlowski J, Vrielink A; Proc Natl Acad Sci U S A 2003;100:6992-6997. PMID:12764229