Inclusion membrane protein probably involved in early modification events of the chlamydial inclusion. In infected HeLa cells colocalizes with host 14-3-3 protein (YWHAB); phosphorylation of Ser-166 is probably required (PubMed:11260479). Interacts with Pkn1 (PubMed:14500499). Secreted, probably by a type III secretion system (Probable). Localized in the inclusion membrane (PubMed:10447885, PubMed:11207546, PubMed:11260479, PubMed:12065525). Inclusion membrane staining is punctate (PubMed:10447885). The C-terminus faces the host cytosol (PubMed:11207546). Present in reticulate bodies (RB) not detected in elementary bodies (EB) (at protein level) (PubMed:10447885). Found only in reticulate bodies in infected HeLa cells (PubMed:12694613). Cotranscribed with incD, incE and incG within 2 hours after internalization by host cells (PubMed:10447885). Detected at 4 hours post-infection in HeLa cells (at protein level) (PubMed:12694613). Phosphorylated, possibly at more than one position, in infected HeLa cells (PubMed:11260479). Phosphorylated by chlamydial kinase Pnk1 (PubMed:14500499).