Abstract
A genomic library of the 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase-containing plant growth-promoting bacterium Enterobacter cloacae UW4 in pUC19 in Escherichia coli was screened for the ability to utilize ACC as a sole source of nitrogen. One of the clones that was isolated contained a plasmid with an insert of approximately 0.8 kb that conferred ACC deaminase activity. Sequence analysis revealed that this DNA fragment contains an open-reading frame of 696 nucleotides predicted to encode a protein of 232 amino acids, a member of the amidohydrolase protein superfamily, i.e., a deaminase that contains a mononuclear or binuclear metal center as compared to the canonical ACC deaminase which contains pyridoxal phosphate as a co-factor.
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