CHASE7 is a conserved periplasmic sensor domain found in histidine kinases and diguanylate cyclases/phosphodiesterases, including the diguanylate cyclase DgcQ (YedQ) that regulates biofilm formation and motility in Escherichia coli [1, 2].

1: GGDEF proteins YeaI, YedQ, and YfiN reduce early biofilm formation and swimming motility in Escherichia coli. Sanchez-Torres V, Hu H, Wood TK; Appl Microbiol Biotechnol. 2011;90:651-658. PMID:21181144

2: Systematic Nomenclature for GGDEF and EAL Domain-Containing Cyclic Di-GMP Turnover Proteins of Escherichia coli. Hengge R, Galperin MY, Ghigo JM, Gomelsky M, Green J, Hughes KT, Jenal U, Landini P; J Bacteriol. 2015;198:7-11. PMID:26148715