Phylogenomic analysis of lipid biosynthetic genes of Archaea shed light on the ‘lipid divide’
Corresponding Author
Laura Villanueva
Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research, and Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands
For correspondence. E-mail [email protected]; Tel. +31 0222369428/550; Fax +31 0222319674.Search for more papers by this authorStefan Schouten
Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research, and Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands
Faculty of Geosciences, Utrecht University, P.O. Box 80.021, Utrecht, 3508 TA, The Netherlands
Search for more papers by this authorJaap S. Sinninghe Damsté
Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research, and Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands
Faculty of Geosciences, Utrecht University, P.O. Box 80.021, Utrecht, 3508 TA, The Netherlands
Search for more papers by this authorCorresponding Author
Laura Villanueva
Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research, and Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands
For correspondence. E-mail [email protected]; Tel. +31 0222369428/550; Fax +31 0222319674.Search for more papers by this authorStefan Schouten
Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research, and Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands
Faculty of Geosciences, Utrecht University, P.O. Box 80.021, Utrecht, 3508 TA, The Netherlands
Search for more papers by this authorJaap S. Sinninghe Damsté
Department of Marine Microbiology and Biogeochemistry, NIOZ, Royal Netherlands Institute for Sea Research, and Utrecht University, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands
Faculty of Geosciences, Utrecht University, P.O. Box 80.021, Utrecht, 3508 TA, The Netherlands
Search for more papers by this authorSummary
The lipid membrane is one of the most characteristic traits distinguishing the three domains of life. Membrane lipids of Bacteria and Eukarya are composed of fatty acids linked to glycerol-3-phosphate (G3P) via ester bonds, while those of Archaea possess isoprene-based alkyl chains linked by ether linkages to glycerol-1-phosphate (G1P), resulting in the opposite stereochemistry of the glycerol phosphate backbone. This ‘lipid divide’ has raised questions on the evolution of microbial life since eukaryotes are thought to have evolved from the Archaea, requiring a radical change in membrane composition. Here, we searched for homologs of enzymes involved in membrane lipid and fatty acid synthesis in a wide variety of archaeal genomes and performed phylogenomic analyses. We found that two uncultured archaeal groups, i.e. marine euryarchaeota group II/III and ‘Lokiarchaeota’, recently discovered descendants of the archaeal ancestor leading to eukaryotes, lack the gene to synthesize G1P and, consequently, the capacity to synthesize archaeal membrane lipids. However, our analyses reveal their genetic capacity to synthesize G3P-based ‘chimeric lipids’ with either two ether-bound isoprenoidal chains or with an ester-bound fatty acid instead of an ether-bound isoprenoid. These archaea may reflect the ‘archaea-to-eukaryote’ membrane transition stage which have led to the current ‘lipid divide’.
Supporting Information
Additional Supporting Information may be found in the online version of this article at the publisher's web-site:
Filename | Description |
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emi13361-sup-0001-suppinfo1.jpg66.9 KB | Fig. S1. Archaeal 16S rRNA gene-based phylogeny modified from Spang et al. (2015). TACK, Thaumarchaeota-Aigarchaeota-Crenarchaeota-Korarchaeota superphylum; Bathyarchaeota (Miscellaneous Crenarchaeota Group, MCG and group C3); DSAG, Deep-Sea Archaeal Group/Marine Benthic Group B (including ‘Lokiarchaeum’; Spang et al., 2015); MHVG, Marine Hydrothermal Vent Group; Euryarchaeota superphylum includes the uncultured group II (MGII) and group III (MGIII) euryarchaeota, among others. DPANN superphylum includes Diapherotrites, Parvarchaeota, Aenigmarchaeota, Nanoarchaeota, among others (Castelle et al., 2015). |
emi13361-sup-0002-suppinfo2.jpg6 MB | Fig. S2. Phylogenetic tree of geranylgeranylglyceryl phosphate (GGGP) synthase homologs in archaeal genomes. Tree was constructed using the maximum likelihood method and the LG model plus gamma distribution and invariant site (LG+G+I). The scale bar represents number of substitutions per site. The analysis included 364 positions in the final dataset. Branch support was calculated with the approximate likelihood ratio test (aLRT) and values ≥50% are indicated on the branches. This tree showed the previously reported divergence of GGGP synthases in two different clusters (cluster 1 including the Halobacteriales, Archaeoglobales and Methanomicrobiales, Fig. S2B; and cluster 2 including Thaumarchaeota, Crenarchaeota and GGGP synthases of the rest of euryarchaeotal orders; Fig. S2A; Boucher et al., 2004; Villanueva et al., 2014). The putative GGGP synthase annotated in the ‘Lokiarchaeum’ genome. This sequence is closely related to GGGP synthases of the Thermoplasmatales, including uncultured marine group II and III euryarchaeota (MGII/III). Fig. S2C indicates the phylogenetic position of the Thaumarchaeota single cell genomes within the tree. |
emi13361-sup-0003-suppinfo3.jpg435.7 KB | Fig. S3. Phylogenetic tree of putative digeranylgeranylglyceryl phosphate (DGGGP) synthase homologs in archaeal genomes. This tree is based on the putative archaeal DGGGP synthase phylogenetic tree by Villanueva et al. (2014). Tree was constructed using the maximum likelihood method and the LG model plus gamma distribution and invariant site (LG+G+I). The scale bar represents number of amino acid substitutions per site. The analysis included 422 positions in the final dataset. Branch support was calculated with the approximate likelihood ratio test (aLRT) and values ≥50% are indicated on the branches. Fig. S3A indicates the phylogenetic relationship between the thaumarchaeotal prenyltransferases and the archaeal DGGGP synthase. Fig. S3B indicates the distribution of the putative DGGGP synthases in the different archaeal groups. The putative DGGGP synthase annotated in the ‘Lokiarchaeum’ genome (indicated in bold) was closely related to the DGGGP synthases of the euryarchaeaotal group Archaeoglobales. Putative DGGGP synthases annotated in the genomes of the uncultured marine group II and III euryarchaeota are not clustered with the rest of the putative DGGGP synthases. |
emi13361-sup-0004-suppinfo4.xlsx161.8 KB | Table S1. Compilation of NCBI accession numbers of the enzymes included in Table 1 for the different archaeal genomes analyzed in this study. |
emi13361-sup-0005-suppinfo5.docx15.9 KB | Table S2. Presence (√ in green) and absence (× in red) putative homologs of enzymes involved in the archaeal membrane lipid and fatty acid biosynthetic pathways in the ‘Lokiarchaeum’ genome (Spang et al., 2015) and NCBI accession numbers (see Figs. 1 and 5, and text for details). |
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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