This is a family of proteins that are archaea-specific components of the bacterial-like chemotaxis signal transduction system of archaea. In H. salinarum, the CheF proteins interact with the chemotaxis proteins CheY, CheD and CheC2 as well as the flagella-accessory proteins FlaCE and FlaD, and are essential for any tactic response. CheF probably functions at the interface between the bacterial-like chemotaxis signal transduction system and the archaeal flagellar apparatus.

1: Identification of Archaea-specific chemotaxis proteins which interact with the flagellar apparatus. Schlesner M, Miller A, Streif S, Staudinger WF, Muller J, Scheffer B, Siedler F, Oesterhelt D; BMC Microbiol. 2009;9:56. PMID:19291314