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. 1984 Sep;159(3):986–990. doi: 10.1128/jb.159.3.986-990.1984

Purification and properties of D-mannitol-1-phosphate dehydrogenase and D-glucitol-6-phosphate dehydrogenase from Escherichia coli.

M J Novotny, J Reizer, F Esch, M H Saier Jr
PMCID: PMC215757  PMID: 6384188

Abstract

D-Mannitol-1-phosphate dehydrogenase (EC 1.1.1.17) and D-glucitol-6-phosphate dehydrogenase (EC 1.1.1.140) were purified to apparent homogeneity in good yields from Escherichia coli. The amino acid compositions, N-terminal amino acid sequences, sensitivities to chemical reagents, and catalytic properties of the two enzymes were determined. Both enzymes showed absolute specificities for their substrates. The subunit molecular weights of mannitol-1-phosphate and glucitol-6-phosphate dehydrogenases were 40,000 and 26,000, respectively; the apparent molecular weights of the native proteins, determined by gel filtration, were 40,000 and 117,000, respectively. It is therefore concluded that whereas mannitol-1-phosphate dehydrogenase is a monomer, glucitol-6-phosphate dehydrogenase is probably a tetramer. These two proteins differed in several fundamental respects.

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Selected References

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