The Proteome Folding Problem and Cellular Proteostasis |
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| Affiliation: | 1. Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA;2. Departments of Biochemistry & Molecular Biology and Chemistry, University of Massachusetts-Amherst, Amherst, MA 01003, USA;1. Department of Biotechnology, Bhupat & Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India;2. Department of Physics, University of Alberta, Edmonton, AB T6G 2E1, Canada;1. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California;2. Department of Chemistry, University of California, Berkeley, Berkeley, California;3. Department of Bioengineering, University of California, Berkeley, Berkeley, California;4. Pitzer Center for Theoretical Chemistry, University of California, Berkeley, Berkeley, California;1. Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot 7600001, Israel;2. Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7600001, Israel |
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| Abstract: | Stunning advances have been achieved in addressing the protein folding problem, providing deeper understanding of the mechanisms by which proteins navigate energy landscapes to reach their native states and enabling powerful algorithms to connect sequence to structure. However, the realities of the in vivo protein folding problem remain a challenge to reckon with. Here, we discuss the concept of the “proteome folding problem”—the problem of how organisms build and maintain a functional proteome—by admitting that folding energy landscapes are characterized by many misfolded states and that cells must deploy a network of chaperones and degradation enzymes to minimize deleterious impacts of these off-pathway species. The resulting proteostasis network is an inextricable part of in vivo protein folding and must be understood in detail if we are to solve the proteome folding problem. We discuss how the development of computational models for the proteostasis network’s actions and the relationship to the biophysical properties of the proteome has begun to offer new insights and capabilities. |
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| Keywords: | protein folding proteome folding proteostasis chaperone energy landscape |
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