A paralog of Pcc1 is the fifth core subunit of the KEOPS tRNA-modifying complex in Archaea

Marie-Claire Daugeron, Sophia Missoury, Violette Cunha, Noureddine Lazar, Bruno Collinet, Herman Tilbeurgh () and Tamara Basta ()
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Marie-Claire Daugeron: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Sophia Missoury: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Violette Cunha: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Noureddine Lazar: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Bruno Collinet: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Herman Tilbeurgh: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)
Tamara Basta: Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC)

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract In Archaea and Eukaryotes, the synthesis of a universal tRNA modification, N6-threonyl-carbamoyl adenosine (t6A), is catalyzed by the KEOPS complex composed of Kae1, Bud32, Cgi121, and Pcc1. A fifth subunit, Gon7, is found only in Fungi and Metazoa. Here, we identify and characterize a fifth KEOPS subunit in Archaea. This protein, dubbed Pcc2, is a paralog of Pcc1 and is widely conserved in Archaea. Pcc1 and Pcc2 form a heterodimer in solution, and show modest sequence conservation but very high structural similarity. The five-subunit archaeal KEOPS does not form dimers but retains robust tRNA binding and t6A synthetic activity. Pcc2 can substitute for Pcc1 but the resulting KEOPS complex is inactive, suggesting a distinct function for the two paralogs. Comparative sequence and structure analyses point to a possible evolutionary link between archaeal Pcc2 and eukaryotic Gon7. Our work indicates that Pcc2 regulates the oligomeric state of the KEOPS complex, a feature that seems to be conserved from Archaea to Eukaryotes.

Date: 2023
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DOI: 10.1038/s41467-023-36210-y

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