2WPY:
reference: A coiled-coil motif that sequesters ions to the hydrophobic core., Hartmann MD, Ridderbusch O, Zeth K, Albrecht R, Testa O, Woolfson DN, Sauer G, Dunin-Horkawicz S, Lupas AN, Alvarez BH, Proc Natl Acad Sci U S A. 2009 Oct 6;106(40):16950-5. Epub 2009 Sep 23. PMID: 19805097

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