A coding sequence (CD36-03230) from the yeast Candidadubliniensis had been previously annotated as a vanillin dehydrogenase (VDH). The corresponding protein (CD36-03230p) was recombinantly expressed in Escherichia coli and analysed. The protein is most likely a tetramer in solution as judged by crosslinking and gel filtration experiments. CD36-03230p is an active aldehyde dehydrogenase favouring cyclic and aromatic substrates. Positive cooperativity and substrate inhibition wereobserved with some substrates. The redox cofactor NADP+ andsubstrates affected the thermal stability of the protein. Interestingly, the enzyme had no detectable activity with vanillin suggesting that the annotation is incorrect. It has been previously hypothesized that a methionine residue at a key position in the active site of yeast aldehyde dehydrogenases sterically hinders cyclic substrates and restricts specificity to aliphatic aldehydes. Molecular modeling of CD36-03230p demonstrates that it has an isoleucine residue (Ile-156) at this position, further strengtheningthis hypothesis.
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Datta, S., Annapure, U. S., & Timson, D. (2016). Characterization of Cd36_03230p, a putative vanillin dehydrogenase from Candida dubliniensis. RSC Advances, 6(102), 99774-99780. https://doi.org/10.1039/c6ra22209a