6-Phosphogluconate dehydrogenase
class of enzymes
6-Phosphogluconate dehydrogenase (6PGD) is an enzyme in the pentose phosphate pathway. It forms ribulose 5-phosphate from 6-phosphogluconate:
It is an oxidative carboxylase that catalyses the oxidative decarboxylation of 6-phosphogluconic acid into ribulose 5-phosphate in the presence of oxidised NAD+. This reaction is a component of the hexose mono-phosphate shunt and pentose phosphate pathways (PPP). Prokaryotic and eukaryotic 6PGD are proteins of about 470 amino acids whose sequences are highly conserved. The protein is a homodimer in which the monomers act independently: each contains a large, mainly alpha-helical domain and a smaller beta-alpha-beta domain, containing a mixed parallel and anti-parallel 6-stranded beta sheet. NADP is bound in a cleft in the small domain, the substrate binding in an adjacent pocket.
Biotechnological significance
Recently, 6PGD was demonstrated to catalyze also the reverse reaction (i.e. reductive carboxylation) in vivo. Experiments using Escherichia coli selection strains revealed that this reaction was efficient enough to support the formation of biomass based solely on CO2 and pentose sugars. In the future, this property could be exploited for synthetic carbon fixation routes.
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