Journal
SCIENCE ADVANCES
Volume 6, Issue 43, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abc5822
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Funding
- Swiss National Science Foundation [310030B_185388, 407240_167125, 310030_182315]
- Swiss National Science Foundation (SNF) [310030B_185388, 310030_182315, 407240_167125] Funding Source: Swiss National Science Foundation (SNF)
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The homotrimeric molecular chaperone Skp of Gram-negative bacteria facilitates the transport of outer membrane proteins across the periplasm. It has been unclear how its activity is modulated during its functional cycle. Here, we report an atomic-resolution characterization of the Escherichia coli Skp monomer-trimer transition. We find that the monomeric state of Skp is intrinsically disordered and that formation of the oligomerization interface initiates folding of the.-helical coiled-coil arms via a unique stapling mechanism, resulting in the formation of active trimeric Skp. Native client proteins contact all three Skp subunits simultaneously, and accordingly, their binding shifts the Skp population toward the active trimer. This activation mechanism is shown to be essential for Salmonella fitness in a mouse infection model. The coupled mechanism is a unique example of how an ATP-independent chaperone can modulate its activity as a function of the presence of client proteins.
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