title: Ribosome recycling depends on a mechanistic link between the FeS cluster domain and a conformational switch of the twin-ATPase ABCE1.
abstract: Despite some appealing similarities of protein synthesis across all phyla of life, the final phase of mRNA translation has yet to be captured. Here, we reveal the ancestral role and mechanistic principles of the newly identified twin-ATPase ABCE1 in ribosome recycling. We demonstrate that the unique iron-sulfur cluster domain and an ATP-dependent conformational switch of ABCE1 are essential both for ribosome binding and recycling. By direct (11) interaction, the peptide release factor aRF1 is shown to synergistically promote ABCE1 function in posttermination ribosome recycling. Upon ATP binding, ABCE1 undergoes a conformational switch from an open to a closed ATP-occluded state, which drives ribosome dissociation as well as the disengagement of aRF1. ATP hydrolysis is not required for a single round of ribosome splitting but for ABCE1 release from the 30S subunit to reenter a new cycle. These results provide a mechanistic understanding of final phases in mRNA translation.
authors.affiliation: Institute of Biochemistry, Cluster of Excellence Frankfurt-Macromolecular Complexes, Biocenter, Goethe University, Max-von-Laue Strasse 9, D-60438 Frankfurt/Main, Germany.
authors.forename: Dominik
authors.initials: D
authors.lastname: Barthelme
authors.forename: Stephanie
authors.initials: S
authors.lastname: Dinkelaker
authors.forename: Sonja-Verena
authors.initials: SV
authors.lastname: Albers
authors.forename: Paola
authors.initials: P
authors.lastname: Londei
authors.forename: Ulrich
authors.initials: U
authors.lastname: Ermler
authors.forename: Robert
authors.initials: R
authors.lastname: Tampé
mesh_terms: D020823:ADP-Ribosylation Factor 1 / Q000378:metabolism; D018528:ATP-Binding Cassette Transporters / Q000737:chemistry* / Q000378:metabolism; D001105:Archaea; D007506:Iron-Sulfur Proteins / Q000737:chemistry*; D044367:Phase Transition; D014176:Protein Biosynthesis; D011487:Protein Conformation; D012270:Ribosomes / Q000378:metabolism*
chemical_list: D018528:ATP-Binding Cassette Transporters; D007506:Iron-Sulfur Proteins; D020823:ADP-Ribosylation Factor 1