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    J Biol Chem. 1986 Jan 25;261(3):1052-7.

    Nucleotide sequence of lysC gene encoding the lysine-sensitive aspartokinase III of Escherichia coli K12. Evolutionary pathway leading to three isofunctional enzymes.

    Cassan M, Parsot C, Cohen GN, Patte JC.

    The lysC gene encoding the lysine-sensitive aspartokinase III of Escherichia coli K12 has been cloned and its nucleotide sequence determined. Analysis of the deduced protein sequence (449 amino acid residues) reveals that the entire sequence of aspartokinase III is homologous to the N-terminal part of the two iso- and bifunctional aspartokinase-homoserine dehydrogenases I and II of E. coli. An evolutionary pathway leading to the three molecular species present in the same organism is proposed, and the possible involvement of a highly conserved region in subunit interactions is discussed.

    PMID: 3003049 [PubMed - indexed for MEDLINE]

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