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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cloning and expression of the gene encoding catalytic subunit of thermostable glucose dehydrogenase from Burkholderia cepacia in Escherichia coli.

We have cloned a 1620-nucleotide gene encoding the catalytic subunit (alpha subunit) of a thermostable glucose dehydrogenase ( GDH) from Burkholderia cepacia. The FAD binding motif was found in the N-terminal region of the alpha subunit. The deduced primary structure of the alpha subunit showed about 48% identity to the catalytic subunits of sorbitol dehydrogenase ( SDH) from Gluconobacter oxydans and 2-keto-D-gluconate dehydrogenases (2KGDH) from Erwinia herbicola and Pantoea citrea. The alpha subunit of B. cepacia was expressed in Escherichia coli in its active water-soluble form, showing maximum dye-mediated GDH activity at 70 degrees C, retaining high thermal stability. A putative open reading frame (ORF) of 507 nucleotides was also found upstream of the alpha subunit encoding an 18-kDa peptide, designated as gamma subunit. The deduced primary structure of gamma subunit showed about 30% identity to the small subunits of the SDH from G. oxydans and 2KGDHs from E. herbicola and P. citrea.[1]


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