Conversion of a Heme-Dependent Dehydratase to a Piperazate Synthase Reveals the Role of the Heme Propionate Group in N–N Bond-Formation - Melanie A. Higgins; Nana Mirotadze; Xinjie Shi; Elesha R. Hoffarth; Yi-Ling Du; Katherine S. Ryan (Journal of the American Chemical Society, 2025)