Planar hexamer

This protein has a 6-fold rotation axis of symmetry.

Niedenzu, T., Roeleke, D., Bains, G., Scherzinger, E., Saenger, W.: Crystal Structure of the Hexameric Replicative Helicase Repa of Plasmid Rsf1010 J.Mol.Biol. 306 pp. 479 (2001)
(PubMed)

1g8y (PDB)

hexamer-trimer of dimers