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Tsuru, D. et al.

Glutathione-independent formaldehyde dehydrogenase from Pseudomons putida: survey of functional groups with special regard for cysteine residues.

The role of cysteine residues for structure and function of formaldehyde dehydrogenase from Pseudomonas putida was analysed by amino acid sequence comparison, homology-based structure modeling, site-directed mutagenesis, and chemical modification. Five out of seven cysteine residues found in the enzyme were concluded to coordinate with an active site zinc (Cys-46) and structural zinc atoms (Cys-97, -100, -103, and -111) from the sequence comparison with other Zn-containing medium-chain alcohol dehydrogenase homologues. The three-dimensional structure model based on the known structure of the horse liver E-type alcohol dehydrogenase ( ADH) indicated that Cys-257 is located very far from the active site Zn and NAD+ binding region, suggesting that Cys-257 does not participate in the enzyme reaction. The structure also suggested that Cys-166 does not coordinate to active site Zn, but Asp-169 functions as a Zn-ligand, instead.[1]

References

Glutathione-independent formaldehyde dehydrogenase from Pseudomons putida: survey of functional groups with special regard for cysteine residues. Tsuru, D., Oda, N., Matsuo, Y., Ishikawa, S., Ito, K., Yoshimoto, T. Biosci. Biotechnol. Biochem. (1997) [Pubmed]

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