CHASE2 is an extracellular sensory domain, which is present in various classes of transmembrane receptors that are parts of signal transduction pathways in bacteria. Specifically, CHASE2 domains are found in histidine kinases, adenylate cyclases, serine/threonine kinases and predicted diguanylate cyclases/phosphodiesterases. Environmental factors that are recognised by CHASE2 domains are not known at this time [1].

1: Common extracellular sensory domains in transmembrane receptors for diverse signal transduction pathways in bacteria and archaea. Zhulin IB, Nikolskaya AN, Galperin MY; J Bacteriol 2003;185:285-294. PMID:12486065