Optimizing the metal binding parameters of an EF-hand-like calcium chelation loop: coordinating side chains play a more important tuning role than chelation loop flexibility.
Drake SK, Zimmer MA, Miller CL, Falke JJ. Optimizing the metal binding parameters of an EF-hand-like calcium chelation loop: coordinating side chains play a more important tuning role than chelation loop flexibility. Biochemistry. 1997 Aug 12; 36(32):9917-26.