, Volume 30, Issue 8, pp 1359-1365
Date: 27 Mar 2008

Heterologous expression of pyruvate decarboxylase in Geobacillus thermoglucosidasius

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Expression of a pyruvate decarboxylase (Pdc) pathway in metabolically versatile thermophilic bacteria could create novel ethanologenic organisms, but no suitable thermostable Pdc is available. We have demonstrated that Pdc from Zymomonas mobilis can be expressed in an active form in Geobacillus thermoglucosidasius at up to 52°C, while expression of Pdc polypeptides up to 54°C was evident from Western blotting. By using an unstable lactate dehydrogenase (ldh) mutant of G. thermoglucosidasius, indirect evidence of Pdc activity in vivo was also obtained.