This domain is found in the C-terminus of the phospho-relay kinase RcsC between Pfam:PF00512 and Pfam:PF00072, and forms a discrete alpha/beta/loop structure [1].

1: A new structural domain in the Escherichia coli RcsC hybrid sensor kinase connects histidine kinase and phosphoreceiver domains. Rogov VV, Rogova NY, Bernhard F, Koglin A, Lohr F, Dotsch V; J Mol Biol. 2006;364:68-79. PMID:17005198