An EXAFS study of jack bean urease, a nickel metalloenzyme

EXAFS and XANES spectra have been recorded above the nickel K edge of urease and three model compounds. Preliminary results indicate that the local environment of the nickel ions in urease resemble most closely that of the nickel ions in the model compound [Ni(L)2(L*)1] (ClO4)1, where L is 1-n-propyl-2-alpha-hydroxybenzyl benzimidazole and L* is the deprotonated form.