5JTM

The structure of chaperone SecB in complex with unstructured PhoA binding site a

Summary for 5JTM

• Entry DOI: 10.2210/pdb5jtm/pdb
• Related: 5JTL 5JTN 5JTO 5JTP 5JTQ 5JTR
• NMR Information: BMRB: 30081
• Descriptor: Protein-export protein SecB, Alkaline phosphatase (2 entities in total)
• Functional Keywords: molecular chaperone, chaperone-hydrolase complex, chaperone/hydrolase
• Biological source: Escherichia coli (strain 55989 / EAEC); More
• Cellular location: Cytoplasm : B7L735; Periplasm: P00634
• Total number of polymer chains: 8
• Total formula weight: 80122.38

Authors

Huang, C.,Saio, T.,Rossi, P.,Kalodimos, C.G. (deposition date: 2016-05-09, release date: 2016-08-24, Last modification date: 2024-05-01)

Primary citation

Huang, C.,Rossi, P.,Saio, T.,Kalodimos, C.G.
Structural basis for the antifolding activity of a molecular chaperone.
Nature, 537:202-206, 2016

PubMed Abstract: Molecular chaperones act on non-native proteins in the cell to prevent their aggregation, premature folding or misfolding. Different chaperones often exert distinct effects, such as acceleration or delay of folding, on client proteins via mechanisms that are poorly understood. Here we report the solution structure of SecB, a chaperone that exhibits strong antifolding activity, in complex with alkaline phosphatase and maltose-binding protein captured in their unfolded states. SecB uses long hydrophobic grooves that run around its disk-like shape to recognize and bind to multiple hydrophobic segments across the length of non-native proteins. The multivalent binding mode results in proteins wrapping around SecB. This unique complex architecture alters the kinetics of protein binding to SecB and confers strong antifolding activity on the chaperone. The data show how the different architectures of chaperones result in distinct binding modes with non-native proteins that ultimately define the activity of the chaperone.

PubMed: 27501151
DOI: 10.1038/nature18965

Experimental method

SOLUTION NMR