Righthanded, 3-sided <a href="//commons.wikimedia.org/w/index.php?title=Beta_helix&amp;action=edit&amp;redlink=1" class="new" title="Beta helix (page does not exist)">beta helix</a> fold in <a href="//commons.wikimedia.org/w/index.php?title=Pectate_lyase&amp;action=edit&amp;redlink=1" class="new" title="Pectate lyase (page does not exist)">pectate lyase</a> C (6 turns from the center of the enzyme subunit).  Ribbon diagram, viewed end-on down the beta-helix axis. Blue arrows show chain direction in the beta-strands of the three parallel <a href="//commons.wikimedia.org/w/index.php?title=Beta_sheet&amp;action=edit&amp;redlink=1" class="new" title="Beta sheet (page does not exist)">beta sheets</a>; the chain spirals up toward the viewer in a counter-clockwise direction.  From PDB file 2PEC, visualized in KiNG.
<a href="//commons.wikimedia.org/wiki/User:Dcrjsr" title="User:Dcrjsr">Dcrjsr</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>