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Phylogenetic and functional diversity of aldehyde-alcohol dehydrogenases in microalgae

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The study shows the biochemical and enzymatic divergence between the two aldehyde-alcohol dehydrogenases of the alga Polytomella sp., shedding light on novel aspects of the enzyme evolution amid unicellular eukaryotes.

Abstract

Aldehyde-alcohol dehydrogenases (ADHEs) are large metalloenzymes that typically perform the two-step reduction of acetyl-CoA into ethanol. These enzymes consist of an N-terminal acetylating aldehyde dehydrogenase domain (ALDH) and a C-terminal alcohol dehydrogenase (ADH) domain. ADHEs are present in various bacterial phyla as well as in some unicellular eukaryotes. Here we focus on ADHEs in microalgae, a diverse and polyphyletic group of plastid-bearing unicellular eukaryotes. Genome survey shows the uneven distribution of the ADHE gene among free-living algae, and the presence of two distinct genes in various species. We show that the non-photosynthetic Chlorophyte alga Polytomella sp. SAG 198.80 harbors two genes for ADHE-like enzymes with divergent C-terminal ADH domains. Immunoblots indicate that both ADHEs accumulate in Polytomella cells growing aerobically on acetate or ethanol. ADHE1 of ~ 105-kDa is found in particulate fractions, whereas ADHE2 of ~ 95-kDa is mostly soluble. The study of the recombinant enzymes revealed that ADHE1 has both the ALDH and ADH activities, while ADHE2 has only the ALDH activity. Phylogeny shows that the divergence occurred close to the root of the Polytomella genus within a clade formed by the majority of the Chlorophyte ADHE sequences, next to the cyanobacterial clade. The potential diversification of function in Polytomella spp. unveiled here likely took place after the loss of photosynthesis. Overall, our study provides a glimpse at the complex evolutionary history of the ADHE in microalgae which includes (i) acquisition via different gene donors, (ii) gene duplication and (iii) independent evolution of one of the two enzymatic domains.

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Data availability

The ADHE1 cDNA sequence can be found in the DDBJ/EMBL/GenBank databases under the accession number ERP116271.

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Acknowledgements

We thank Dr. David R. Smith (Dalhousie University, Canada) for sharing genome assemblies of P. magna, P. capuana, P. piriformis and P. parva.

Funding

This work was supported by the Centre National de la Recherche Scientifique (CNRS), Aix-Marseille Université (AMU) and the LABEX Dynamo (ANR-11-LABX-0011-01). Proteomic experiments were partly supported by the Agence Nationale de la Recherche (ANR-10-INBS-08-01 ProFI Grant).

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AA and RvL conceived the study, designed and conducted the experiments. OV, NJT, BL and AA assembled and annotated genomes. YC and SB performed the proteomic studies. AA, RvL, WN and OV performed the bioinformatics analyses. AA, RvL and OV wrote the manuscript and generated the figures. All authors participated and approved the final version of the manuscript.

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Correspondence to Ariane Atteia.

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The authors declare that they have no conflicts of interest.

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van Lis, R., Couté, Y., Brugière, S. et al. Phylogenetic and functional diversity of aldehyde-alcohol dehydrogenases in microalgae. Plant Mol Biol 105, 497–511 (2021). https://doi.org/10.1007/s11103-020-01105-9

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  • DOI: https://doi.org/10.1007/s11103-020-01105-9

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