4PAM:
reference: A conserved phenylalanine as relay between the alpha5 helix and the GDP binding region of heterotrimeric Gi protein alpha subunit., Kaya AI, Lokits AD, Gilbert JA, Iverson TM, Meiler J, Hamm HE, J Biol Chem. 2014 Jul 18. pii: jbc.M114.572875. PMID: 25037222

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).