This entry represents a repeated domain found in Spiralin proteins found in spiroplasma bacteria. Spiroplasmas are helically shaped pathogenic bacteria related to the mycoplasmas. The surface of spiroplasma bacteria is crowded with the membrane-anchored lipoprotein spiralin whose structure and function are unknown although its cellular function is thought to be a structural and mechanical one rather than a catalytic one [1].

1: Secondary structure of spiralin in solution, at the air/water interface, and in interaction with lipid monolayers. Castano S, Blaudez D, Desbat B, Dufourcq J, Wroblewski H; Biochim Biophys Acta 2002;1562:45-56. PMID:11988221