Studies of 1‑Amino-2,2-difluorocyclopropane-1-carboxylic Acid: Mechanism of Decomposition and Inhibition of 1‑Aminocyclopropane-1-carboxylic Acid Deaminase
1-Amino-2,2-difluorocyclopropane-1-carboxylic
acid (DFACC)
is of interest in the study of 1-aminocyclopropane-1-carboxylic
acid (ACC) deaminase due to the increased reactivity of its cyclopropyl
functionality. It is shown that DFACC is unstable under near-physiological
conditions where it primarily decomposes via specific-base catalysis
to 3-fluoro-2-oxobut-3-enoic acid with a rate constant of 0.18 ±
0.01 min<sup>–1</sup>. Upon incubation with ACC deaminase,
DFACC is found to be a slow-dissociating inhibitor of ACC deaminase
with submicromolar affinity