This is the helical region from bacterial dynamin-like proteins which covers the middle and GED domains which mediate extensive protein-protein contacts [1,2]. These proteins are large GTPases with the same multidomain architecture that is found in dynamin-like proteins.

1: A bacterial dynamin-like protein. Low HH, Lowe J; Nature. 2006;444:766-769. PMID:17122778

2: Structure of a bacterial dynamin-like protein lipid tube provides a mechanism for assembly and membrane curving. Low HH, Sachse C, Amos LA, Lowe J; Cell. 2009;139:1342-1352. PMID:20064379