Site-directed mutagenesis of proline 52 to glycine in amicyanin converts a true electron transfer reaction into one that is conformationally gated.
Ma J.K., Carrell C.J., Mathews F.S., & Davidson V.L. (2006). “Site-directed mutagenesis of proline 52 to glycine in amicyanin converts a true electron transfer reaction into one that is conformationally gated.” Biochemistry. 2006 Jul 11;45(27):8284-93. (Abstract)