Parallel evolution of non-homologous isofunctional enzymes in methionine biosynthesis

Karine Bastard; Alain Perret; Aline Mariage; Thomas Bessonnet; Agnès Pinetturpault; Jeanlouis Petit; Ekaterina Darii; Pascal Bazire; Carine Vergnevaxelaire; Clémence Brewee; Adrien Debard; Virginie Pellouin; Marielle Besnardgonnet; François Artiguenave; Claudine Médigue; David Vallenet; Antoine Danchin; Anne Zaparucha; Jean Weissenbach; Marcel Salanoubat; Véronique De Berardinis

Parallel evolution of non-homologous isofunctional enzymes in methionine biosynthesis

Karine Bastard ^{1, 2, 3} Alain Perret ^{1, 2, 3} Aline Mariage ^{1, 2, 3} Thomas Bessonnet ^{1, 2, 3} Agnès Pinetturpault ^{1, 2, 3} Jeanlouis Petit ^{1, 2, 3} Ekaterina Darii ^{1, 2, 3} Pascal Bazire ^{1, 2, 3} Carine Vergnevaxelaire ^{1, 2, 3} Clémence Brewee ^{1, 2, 3} Adrien Debard ^{1, 2, 3} Virginie Pellouin ^{1, 2, 3} Marielle Besnardgonnet ^{1, 2, 3} François Artiguenave ⁴ Claudine Médigue ^{1, 2, 3} David Vallenet ^{1, 2, 3} Antoine Danchin ⁵ Anne Zaparucha ^{1, 2, 3} Jean Weissenbach ^{1, 2, 3} Marcel Salanoubat ^{1, 2, 3} Véronique De Berardinis ^{1, 2, 3, *}

* Corresponding author

1 GENOSCOPE - Genoscope - Centre national de séquençage [Evry]

2 UMR 8030 - Génomique métabolique

3 Université Paris-Saclay

4 CNG - Centre National de Génotypage

5 ICAN - Unité de Recherche sur les Maladies Cardiovasculaires, du Métabolisme et de la Nutrition = Institute of cardiometabolism and nutrition

Abstract : Experimental validation of enzyme function is crucial for genome interpretation, but it remains challenging because it cannot be scaled up to accommodate the constant accumulation of genome sequences. We tackled this issue for the MetA and MetX enzyme families, phylogenetically unrelated families of acyl-L-homoserine transferases involved in L-methionine biosynthesis. Members of these families are prone to incorrect annotation because MetX and MetA enzymes are assumed to always use acetyl-CoA and succinyl-CoA, respectively. We determined the enzymatic activities of 100 enzymes from diverse species, and interpreted the results by structural classification of active sites based on protein structure modeling. We predict that >60% of the 10,000 sequences from these families currently present in databases are incorrectly annotated, and suggest that acetyl-CoA was originally the sole substrate of these isofunctional enzymes, which evolved to use exclusively succinyl-CoA in the most recent bacteria. We also uncovered a divergent subgroup of MetX enzymes in fungi that participate only in L-cysteine biosynthesis as O-succinyl-L-serine transferases.

Document type :

Journal articles

Domain :

Life Sciences [q-bio] / Biochemistry, Molecular Biology

Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-02132779
Contributor : Bruno Savelli <>
Submitted on : Friday, May 17, 2019 - 3:06:15 PM
Last modification on : Wednesday, May 22, 2019 - 1:21:39 AM

Parallel evolution of non-homologous isofunctional enzymes in methionine biosynthesis

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Parallel evolution of non-homologous isofunctional enzymes in methionine biosynthesis

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