Lateral gene transfer and gene duplication played a key role in the evolution of mastigamoeba balamuthi hydrogenosomes

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Lateral gene transfer and gene duplication played a key role in the evolution of mastigamoeba balamuthi hydrogenosomes. / Nývltová, Eva; Stairs, Courtney W.; Hrdý, Ivan; Rídl, Jakub; Mach, Jan; Paɥes, Jan; Roger, Andrew J.; Tachezy, Jan.

I: Molecular biology and evolution, Vol. 32, Nr. 4, 01.04.2015, s. 1039-1055.

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Nývltová, Eva ; Stairs, Courtney W. ; Hrdý, Ivan ; Rídl, Jakub ; Mach, Jan ; Paɥes, Jan ; Roger, Andrew J. ; Tachezy, Jan. / Lateral gene transfer and gene duplication played a key role in the evolution of mastigamoeba balamuthi hydrogenosomes. I: Molecular biology and evolution. 2015 ; Vol. 32, Nr. 4. s. 1039-1055.

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TY - JOUR

T1 - Lateral gene transfer and gene duplication played a key role in the evolution of mastigamoeba balamuthi hydrogenosomes

AU - Nývltová, Eva

AU - Stairs, Courtney W.

AU - Hrdý, Ivan

AU - Rídl, Jakub

AU - Mach, Jan

AU - Paɥes, Jan

AU - Roger, Andrew J.

AU - Tachezy, Jan

PY - 2015/4/1

Y1 - 2015/4/1

N2 - Lateral gene transfer (LGT) is an important mechanism of evolution for protists adapting to oxygen-poor environments. Specifically, modifications of energy metabolism in anaerobic forms of mitochondria (e.g., hydrogenosomes) are likely to have been associated with gene transfer from prokaryotes. An interesting question is whether the products of transferred genes were directly targeted into the ancestral organelle or initially operated in the cytosol and subsequently acquired organelle-targeting sequences. Here, we identified key enzymes of hydrogenosomal metabolism in the free-living anaerobic amoebozoan Mastigamoeba balamuthi and analyzed their cellular localizations, enzymatic activities, and evolutionary histories. Additionally, we characterized 1) several canonical mitochondrial components including respiratory complex II and the glycine cleavage system, 2) enzymes associated with anaerobic energy metabolism, including an unusual D-lactate dehydrogenase and acetyl CoA synthase, and 3) a sulfate activation pathway. Intriguingly, components of anaerobic energy metabolism are present in at least two gene copies. For each component, one copy possesses an mitochondrial targeting sequence (MTS), whereas the other lacks an MTS, yielding parallel cytosolic and hydrogenosomal extended glycolysis pathways. Experimentally, we confirmed that the organelle targeting of several proteins is fully dependent on the MTS. Phylogenetic analysis of all extended glycolysis components suggested that these components were acquired by LGT. We propose that the transformation from an ancestral organelle to a hydrogenosome in the M. balamuthi lineage involved the lateral acquisition of genes encoding extended glycolysis enzymes that initially operated in the cytosol and that established a parallel hydrogenosomal pathway after gene duplication and MTS acquisition.

AB - Lateral gene transfer (LGT) is an important mechanism of evolution for protists adapting to oxygen-poor environments. Specifically, modifications of energy metabolism in anaerobic forms of mitochondria (e.g., hydrogenosomes) are likely to have been associated with gene transfer from prokaryotes. An interesting question is whether the products of transferred genes were directly targeted into the ancestral organelle or initially operated in the cytosol and subsequently acquired organelle-targeting sequences. Here, we identified key enzymes of hydrogenosomal metabolism in the free-living anaerobic amoebozoan Mastigamoeba balamuthi and analyzed their cellular localizations, enzymatic activities, and evolutionary histories. Additionally, we characterized 1) several canonical mitochondrial components including respiratory complex II and the glycine cleavage system, 2) enzymes associated with anaerobic energy metabolism, including an unusual D-lactate dehydrogenase and acetyl CoA synthase, and 3) a sulfate activation pathway. Intriguingly, components of anaerobic energy metabolism are present in at least two gene copies. For each component, one copy possesses an mitochondrial targeting sequence (MTS), whereas the other lacks an MTS, yielding parallel cytosolic and hydrogenosomal extended glycolysis pathways. Experimentally, we confirmed that the organelle targeting of several proteins is fully dependent on the MTS. Phylogenetic analysis of all extended glycolysis components suggested that these components were acquired by LGT. We propose that the transformation from an ancestral organelle to a hydrogenosome in the M. balamuthi lineage involved the lateral acquisition of genes encoding extended glycolysis enzymes that initially operated in the cytosol and that established a parallel hydrogenosomal pathway after gene duplication and MTS acquisition.

KW - acetylCoA synthetase

KW - glycine cleavage system

KW - hydrogenase

KW - PFO

KW - succinate dehydrogenase

KW - sulfate activation pathway

U2 - 10.1093/molbev/msu408

DO - 10.1093/molbev/msu408

M3 - Article

C2 - 25573905

AN - SCOPUS:84926637533

VL - 32

SP - 1039

EP - 1055

JO - Molecular biology and evolution

JF - Molecular biology and evolution

SN - 0737-4038

IS - 4

ER -