This entry represents the autochaperone domain of type 1 (AC-1) in the Type Va Secretion System (T5aSS). Autotransporters (ATs) belong to a family of modular proteins secreted by the Type V, subtype a, secretion system (T5aSS) and considered as an important source of virulence factors in lipopolysaccharidic diderm bacteria (archetypical Gram-negative bacteria). The AC of type 1 with beta-fold appears as a prevalent and conserved structural element exclusively associated to beta-helical AT passenger [1].

1: Identification of the Autochaperone Domain in the Type Va Secretion System (T5aSS): Prevalent Feature of Autotransporters with a beta-Helical Passenger. Rojas-Lopez M, Zorgani MA, Kelley LA, Bailly X, Kajava AV, Henderson IR, Polticelli F, Pizza M, Rosini R, Desvaux M; Front Microbiol. 2018;8:2607. PMID:29375499