J. Biol. Chem., Vol. 259, Issue 11, 6826-6832, 06, 1984

Xylose isomerase from Escherichia coli. Characterization of the protein and the structural gene

GD Schellenberg, A Sarthy, AE Larson, MP Backer, JW Crabb, M Lidstrom, BD Hall and CE Furlong

The gene that codes for xylose isomerase in Escherichia coli has been cloned by complementation of a xylose isomerase-negative E. coli mutant. The structural gene is 1320 nucleotides in length and codes for a protein of 440 amino acids. An additional 209 nucleotides 5' and 82 nucleotides 3' to the structural gene were also sequenced. To verify that the cloned gene encodes E. coli xylose isomerase, the enzyme was purified to homogeneity and the sequence of the first 25 amino acid residues was determined by a semimicromanual Edman procedure. These results establish that the NH2-terminal methionine of xylose isomerase is specified by an ATG which is 7 nucleotides downstream from a Shine- Dalgarno sequence.
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