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6CH1

Crystal structure of the cytoplasmic domain of FlhA in monomeric form

Summary for 6CH1
Entry DOI10.2210/pdb6ch1/pdb
Related5V9Q 5V9R
DescriptorFlagellar biosynthesis protein FlhA, 1,2-ETHANEDIOL (3 entities in total)
Functional Keywordsflagellar, structural protein
Biological sourceSalmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)
Total number of polymer chains1
Total formula weight37541.16
Authors
Xing, Q.,Shi, K.,Kalodimos, C.G. (deposition date: 2018-02-21, release date: 2018-05-16, Last modification date: 2023-10-04)
Primary citationXing, Q.,Shi, K.,Portaliou, A.,Rossi, P.,Economou, A.,Kalodimos, C.G.
Structures of chaperone-substrate complexes docked onto the export gate in a type III secretion system.
Nat Commun, 9:1773-1773, 2018
Cited by
PubMed Abstract: The flagellum and the injectisome enable bacterial locomotion and pathogenesis, respectively. These nanomachines assemble and function using a type III secretion system (T3SS). Exported proteins are delivered to the export apparatus by dedicated cytoplasmic chaperones for their transport through the membrane. The structural and mechanistic basis of this process is poorly understood. Here we report the structures of two ternary complexes among flagellar chaperones (FliT and FliS), protein substrates (the filament-capping FliD and flagellin FliC), and the export gate platform protein FlhA. The substrates do not interact directly with FlhA; however, they are required to induce a binding-competent conformation to the chaperone that exposes the recognition motif featuring a highly conserved sequence recognized by FlhA. The structural data reveal the recognition signal in a class of T3SS proteins and provide new insight into the assembly of key protein complexes at the export gate.
PubMed: 29720631
DOI: 10.1038/s41467-018-04137-4
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (1.9 Å)
Structure validation

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