Chlamydia replicate within an intracellular vacuole, termed an inclusion. IncA is probably involved in the homotypic fusion of inclusions. Forms homooligomers. Secreted, probably by a type III secretion system (Probable) (PubMed:9826388). Localized in the inclusion membrane (Probable) (PubMed:9826388). In the inclusion, the C-terminus faces the host cytosol (By similarity). IncA proteins share the same general organization: a short N-terminal domain, a large bilobed hydrophobic domain, and a C-terminal cytoplasmic domain. Belongs to the IncA family.