Figure 8From: The Rodin-Ohno hypothesis that two enzyme superfamilies descended from one ancestral gene: an unlikely scenario for the origins of translation that will not be dismissedQuantitative analysis of the catalytic contributions of Motif 3 and a short N-terminal extension of the Motif 1 helix to the acceleration of histidine activation by HisRS Urzyme. Graphics include the Histidyl-5‘adenylate as spheres. Details of the constructions are described in [38].Back to article page