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Articles

MECHANISM OF CARBON DIOXIDE ACTIVATION OF 1-AMINOCYCLOPROPANE-1-CARBOXYLATE (ACC) OXIDASE

Article number
553_27
Pages
143 – 144
Language
English
Abstract
ACC oxidase (ACCO) catalyzes the final step in ethylene biosynthesis.
ACCO requires ascorbic acid, bicarbonate, ferrous ion and dioxygen for activity.
His177, Asp179 and His234 in ACCO are ligands for iron (Kadyrzhanova et al., 1999; Shaw et al., 1996). These His and Asp residues comprise a 2-His-1-Asp facial triad common to other mononuclear non-heme iron (II) enzymes.
Fe(II) is the dioxygen binding site and the ACC amino group is an iron ligand (Rocklin et al., 1999). To determine the nature and role of other conserved amino acid residues important for conversion of ACC to ethylene and for CO2 activation, native and mutant ACCOs were expressed in Escherichia coli as His-Tag fusion proteins, purified and enzyme kinetics determined.

Publication
Authors
D.R. Dilley, D.K. Kadyrzhanova, Z. Wang
Keywords
ethylene, site-directed mutations, fusion proteins, ascorbic acid.
Full text
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