Abstract
Earth life is built from a quite restricted set of chemicals. Is this an accident of evolution, or are there reasons for the patterns of similarity and diversity in metabolism? I summarize several studies looking at how life has explored “chemical space”, and seeking explanations for the nature of biochemistry. The properties of synthetic alternatives to DNA have lead to a hypothesis about what the features that any genetic material must have, providing a rationale for the incorporation of phosphate into DNA. Synthesis and computational studies of possible amino acids have been synergistic in understanding the limits to which the 20 main proteinaceous amino acids are chemically inevitable and the extent to which they are a frozen accident from the origin of life. A broader exploration of chemical space including all of metabolism shows that metabolism is actually crowded into a limited region of the space of possible chemicals. Using a wide dataset of measurement of the toxicity of chemicals, I have shown that this crowding has important implications for how new chemistry can be added to life, which could in principle be developed into a set of constraints on how any metabolism could evolve. Biochemistry is often constrained to specific chemical function, but not always limited to one molecule to carry out that function. These initial results provide hope that there are computationally tractable approaches to understanding why biochemistry is as it is.
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Notes
- 1.
This was originally termed “substrate independence”, but that earlier phrase implied that an organism could grow on anything, which clearly is not true.
- 2.
In a prokaryotic cell internal compartment, anyway. In compartmentalized eukaryotic cells, each compartment only ‘sees’ a subset of metabolism.
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Acknowledgements
My thanks to Janusz Petkowski (ETH, Zurich) for many useful discussions, to the attendees of the Gordon Research Conference on Synthetic Biology (Summer 2013) for helpful comments, to Sara Seager (MIT) for the continued and unstinting support, to Pierre Pontarotti and the organizers of the 17th Evolutionary Biology Meeting (2013, Marseilles) for inviting me, and to Alan Wilson (Llhasa Ltd) for not believing a word of it.
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Bains, W. (2014). A Trip Through Chemical Space: Why Life Has Evolved the Chemistry That It Has. In: Pontarotti, P. (eds) Evolutionary Biology: Genome Evolution, Speciation, Coevolution and Origin of Life. Springer, Cham. https://doi.org/10.1007/978-3-319-07623-2_18
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