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Endonuclease IV homolog from Dictyostelium discoideum: sequencing and functional expression in AP endonuclease-deficient Escherichia coli
Authors:Tsuji A  Kodaira K  Inoue M  Yasukawa H
Institution:Division of Bioengineering, Faculty of Engineering, Toyama University, 930-8555, Toyama, Japan.
Abstract:We sequenced a gene encoding AP endonuclease DdAPN in Dictyostelium discoideum. The sequence predicts a protein of 542 amino acids, showing high homology to Escherichia coli Endonuclease IV (Endo IV). There is 45% identity to Endo IV using the C-terminal 282 amino acids of the Dictyostelium protein. The DdAPN conserves nine residues for the metal-binding identified in Endo IV. The truncated DdAPN protein containing these sites partially complemented E. coli RPC501 (xth(-), nfo(-)).
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