2KV7 | pdb_00002kv7

NMR solution structure of a soluble PrgI mutant from Salmonella Typhimurium

• PDB DOI: https://doi.org/10.2210/pdb2KV7/pdb
• BMRB: 16770

• Classification: PROTEIN TRANSPORT
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2010-03-09 Released: 2010-06-16 
• Deposition Author(s): Schmidt, H., Poyraz, O., Seidel, K., Delissen, F., Ader, C., Tenenboim, H., Goosmann, C., Laube, B., Thuenemann, A.F., Zychlinski, A., Baldus, M., Lange, A., Griesinger, C., Kolbe, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 25 
• Selection Criteria: structures with the lowest energy 

Literature

Protein refolding is required for assembly of the type three secretion needle.

Poyraz, O., Schmidt, H., Seidel, K., Delissen, F., Ader, C., Tenenboim, H., Goosmann, C., Laube, B., Thunemann, A.F., Zychlinsky, A., Baldus, M., Lange, A., Griesinger, C., Kolbe, M.

(2010) Nat Struct Mol Biol 17: 788-792

• PubMed: 20543831 
• DOI: https://doi.org/10.1038/nsmb.1822
• Primary Citation Related Structures: 
  2KV7, 2X9C


• PubMed Abstract: 
  

  Pathogenic Gram-negative bacteria use a type three secretion system (TTSS) to deliver virulence factors into host cells. Although the order in which proteins incorporate into the growing TTSS is well described, the underlying assembly mechanisms are still unclear. Here we show that the TTSS needle protomer refolds spontaneously to extend the needle from the distal end. We developed a functional mutant of the needle protomer from Shigella flexneri and Salmonella typhimurium to study its assembly in vitro. We show that the protomer partially refolds from alpha-helix into beta-strand conformation to form the TTSS needle. Reconstitution experiments show that needle growth does not require ATP. Thus, like the structurally related flagellar systems, the needle elongates by subunit polymerization at the distal end but requires protomer refolding. Our studies provide a starting point to understand the molecular assembly mechanisms and the structure of the TTSS at atomic level.

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Organizational Affiliation: 
• Max-Planck-Institute for Infection Biology, Cellular Microbiology, Berlin, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 9.09 kDa 
• Atom Count: 641 
• Modeled Residue Count: 83 
• Deposited Residue Count: 83 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein prgI	A	83	Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344	Mutation(s): 2  Gene Names: prgI, STM2873
UniProt
Find proteins for P41784 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P41784  Go to UniProtKB:  P41784

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 25 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-06-16 
Deposition Author(s): Schmidt, H., Poyraz, O., Seidel, K., Delissen, F., Ader, C., Tenenboim, H., Goosmann, C., Laube, B., Thuenemann, A.F., Zychlinski, A., Baldus, M., Lange, A., Griesinger, C., Kolbe, M.

Revision History  

• Version 1.0: 2010-06-16
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2019-12-18
  Changes: Data collection, Database references, Derived calculations
• Version 1.3: 2024-05-01
  Changes: Data collection, Database references