Abstract
It is possible to travel back in time at the molecular level by reconstructing proteins from extinct organisms. Here we report the reconstruction, based on sequence predicted by phylogenetic analysis, of seven Precambrian thioredoxin enzymes (Trx) dating back between ~1.4 and ~4 billion years (Gyr). The reconstructed enzymes are up to 32 °C more stable than modern enzymes, and the oldest show markedly higher activity than extant ones at pH 5. We probed the mechanisms of reduction of these enzymes using single-molecule force spectroscopy. From the force dependency of the rate of reduction of an engineered substrate, we conclude that ancient Trxs use chemical mechanisms of reduction similar to those of modern enzymes. Although Trx enzymes have maintained their reductase chemistry unchanged, they have adapted over 4 Gyr to the changes in temperature and ocean acidity that characterize the evolution of the global environment from ancient to modern Earth.
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Acknowledgements
Supported by the US National Institutes of Health (HL061228 and HL066030 to J.M.F.); the Spanish Ministry of Science and Innovation (J.M.S.-R.); NASA Astrobiology (Georgia Institute of Technology); NASA Exobiology (E.A.G.); Fundación Ibercaja and Fundación Caja Madrid (R.P.-J. and S.G.-M.); and Fundación Alfonso Martín Escudero (J.A.-C.). We thank B. Ibarra-Molero (University of Granada) for assistance with bulk enzymatic assays.
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R.P.-J., J.M.S.-R., E.A.G. and J.M.F. designed the research; Z.-M.Z. and E.A.G. conducted the phylogenetic analysis and sequence reconstruction; A.I.-P. and J.M.S.-R. expressed and purified the ancestral enzymes and conducted the calorimetric measurements and analysis; T.J.K. provided A. aceti Trx; M.T. provided S. tokodaii Trx; A.H. provided human TRX; R.P.-J., I.S.-R., J.A.-C., P.K. and S.G.-M. performed AFM experiments; R.P.-J. and I.S.-R. analyzed AFM data; R.P.-J., E.A.G. and J.M.F. wrote the paper; all authors participated in revising the manuscript.
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Perez-Jimenez, R., Inglés-Prieto, A., Zhao, ZM. et al. Single-molecule paleoenzymology probes the chemistry of resurrected enzymes. Nat Struct Mol Biol 18, 592–596 (2011). https://doi.org/10.1038/nsmb.2020
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DOI: https://doi.org/10.1038/nsmb.2020
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