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Functional analysis through site-directed mutations and phylogeny of the Candida albicans LYS1-encoded saccharopine dehydrogenase

Abstract

Candida albicans LYS1-encoded saccharopine dehydrogenase (CaLys1p, SDH) catalyzes the final biosynthetic step (saccharopine to lysine + α-ketoglutarate) of the novel α-aminoadipate pathway for lysine synthesis in fungi. The reverse reaction catalyzed by lysine-α-ketoglutarate reductase (LKR) is used exclusively in animals and plants for the catabolism of excess lysine. The 1,146 bp C. albicans LYS1 ORF encodes a 382 amino acid SDH. In the present investigation, we have used E. coli-expressed recombinant C. albicans Lys1p for the determination of both forward and reverse SDH activities in vitro, compared the sequence identity of C. albicans Lys1p with other known SDHs and LKRs, performed extensive site-directed mutational analyses of conserved amino acid residues and analyzed the phylogenetic relationship of C. albicans Lys1p to other known SDHs and LKRs. We have identified 14 of the 68 amino acid substitutions as essential for C. albicans Lys1p SDH activity, including two highly conserved functional motifs, H93XXF96XH98 and G138XXXG142XXG145. These results provided new insight into the functional and phylogenetic characteristics of the distinct biosynthetic SDH in fungi and catabolic LKR in higher eukaryotes.

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Acknowledgements

We thank G.R. Janssen for his valuable comments on the manuscript, X.F. Wan for computer support and Barbara J. Stahl for the preparation of the manuscript. This research was supported by a National Institute of General Medical Science grant 1R15GM065153 and Miami University to J.K.B. and a National Institute of General Medical Science grant 1R15GM068547 and Missouri State University to R.C.G.

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Correspondence to J. K. Bhattacharjee.

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Communicated by F. Messenguy

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Guo, S., Garrad, R.C. & Bhattacharjee, J.K. Functional analysis through site-directed mutations and phylogeny of the Candida albicans LYS1-encoded saccharopine dehydrogenase. Mol Genet Genomics 275, 74–80 (2006). https://doi.org/10.1007/s00438-005-0062-z

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  • DOI: https://doi.org/10.1007/s00438-005-0062-z

Keywords

  • C . albicans
  • Saccharopine dehydrogenase
  • Lys1p SDH
  • Site-directed mutation
  • Phylogeny