Trigger factor chaperone acts as a mechanical foldase

Shubhasis Haldar (), Rafael Tapia-Rojo (), Edward C. Eckels, Jessica Valle-Orero and Julio M. Fernandez ()
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Shubhasis Haldar: Columbia University
Rafael Tapia-Rojo: Columbia University
Edward C. Eckels: Columbia University
Jessica Valle-Orero: Columbia University
Julio M. Fernandez: Columbia University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Proteins fold under mechanical forces in a number of biological processes, ranging from muscle contraction to co-translational folding. As force hinders the folding transition, chaperones must play a role in this scenario, although their influence on protein folding under force has not been directly monitored yet. Here, we introduce single-molecule magnetic tweezers to study the folding dynamics of protein L in presence of the prototypical molecular chaperone trigger factor over the range of physiological forces (4–10 pN). Our results show that trigger factor increases prominently the probability of folding against force and accelerates the refolding kinetics. Moreover, we find that trigger factor catalyzes the folding reaction in a force-dependent manner; as the force increases, higher concentrations of trigger factor are needed to rescue folding. We propose that chaperones such as trigger factor can work as foldases under force, a mechanism which could be of relevance for several physiological processes.

Date: 2017
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DOI: 10.1038/s41467-017-00771-6

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