2N01

NMR structure of VirB9 C-terminal domain in complex with VirB7 N-terminal domain from Xanthomonas citri's T4SS

• PDB DOI: https://doi.org/10.2210/pdb2N01/pdb
• BMRB: 25512

• Classification: PROTEIN TRANSPORT/PROTEIN TRANSPORT
• Organism(s): Xanthomonas citri pv. citri str. 306
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2015-03-03 Released: 2015-09-09 
• Deposition Author(s): Oliveira, L.C., Souza, D.P., Salinas, R.K., Wienk, H., Boelens, R., Farah, S.C.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

VirB7 and VirB9 Interactions Are Required for the Assembly and Antibacterial Activity of a Type IV Secretion System.

Oliveira, L.C., Souza, D.P., Oka, G.U., Lima, F.D., Oliveira, R.J., Favaro, D.C., Wienk, H., Boelens, R., Farah, C.S., Salinas, R.K.

(2016) Structure 24: 1707-1718

• PubMed: 27594685 
• DOI: https://doi.org/10.1016/j.str.2016.07.015
• Primary Citation of Related Structures:  
  2N01


• PubMed Abstract: 
  

  The type IV secretion system (T4SS) from the phytopathogen Xanthomonas citri (Xac) is a bactericidal nanomachine. The T4SS core complex is a ring composed of multiple copies of VirB7-VirB9-VirB10 subunits. Xac-VirB7 contains a disordered N-terminal tail (VirB7 ^NT ) that recognizes VirB9, and a C-terminal domain (VirB7 ^CT ) involved in VirB7 self-association. Here, we show that VirB7 ^NT forms a short β strand upon binding to VirB9 and stabilizes it. A tight interaction between them is essential for T4SS assembly and antibacterial activity. Abolishing VirB7 self-association or deletion of the VirB7 C-terminal domain impairs this antibacterial activity without disturbing T4SS assembly. These findings reveal protein interactions within the core complex that are critical for the stability and activity of a T4SS.

---

Organizational Affiliation: 

Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, São Paulo 05508-000, Brazil.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 15.14 kDa 
• Atom Count: 1,068 
• Modelled Residue Count: 129 
• Deposited Residue Count: 131 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
VirB7 protein	A	25	Xanthomonas citri pv. citri str. 306	Mutation(s): 2

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
VirB9 protein	B	106	Xanthomonas citri pv. citri str. 306	Mutation(s): 0  Gene Names: virB9, XAC2620, XAC2622

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-09-09 
Deposition Author(s): Oliveira, L.C., Souza, D.P., Salinas, R.K., Wienk, H., Boelens, R., Farah, S.C.

Revision History  

• Version 1.0: 2015-09-09
  Type: Initial release
  
• Version 1.1: 2016-10-12
  Changes: Database references
• Version 1.2: 2016-10-19
  Changes: Database references