Mutation of Gly-444 inactivates the S. pombe malic enzyme

Viljoen M. ; Van Der Merwe M. ; Subden R.E. ; Van Vuuren H.J.J. (1998)


A mutant malic enzyme gene, mae2-, was cloned from a strain of Schizosaccharomyces pombe that displayed almost no malic enzyme activity. Sequence analysis revealed only one codon-altering mutation, a guanine to adenine at nucleotide 1331, changing the glycine residue at position 444 to an aspartate residue. Gly-444 is located in Region H, previously identified as one of eight highly conserved regions in malic enzymes. We found that Gly-444 is absolutely conserved in 27 malic enzymes from various prokaryotic and eukaryotic sources, as well as in three bacterial malolactic enzymes investigated. The evolutionary conservation of Gly-444 suggests that this residue is important for enzymatic function. Copyright (C) 1998 Federation of European Microbiological Societies.

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