Family members are found in small bacterial proteins, and also in the heavy chains of fungal proteins that contain the domain kinesin, in which this region is located C-terminal of the motor domain (Pfam:PF00225). It adopts a coiled-coil-like conformation [1].

1: Solution structure of HP1242 from Helicobacter pylori. Kang SJ, Park SJ, Jung SJ, Lee BJ; Proteins. 2005;61:1111-1113. PMID:16231304