Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 28.96 kDa 
• Atom Count: 2582 
• Modelled Residue Count: 262 
• Deposited Residue Count: 264 
• Unique protein chains: 1

4UQX

Coevolution of the ATPase ClpV, the TssB-TssC Sheath and the Accessory HsiE Protein Distinguishes Two Type VI Secretion Classes

• PDB DOI: 10.2210/pdb4UQX/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Pseudomonas aeruginosa PAO1
• Expression System: Escherichia coli B
• Mutation(s): No 


• Deposited: 2014-06-25 Released: 2014-10-22 
• Deposition Author(s): Forster, A., Planamente, S., Manoli, E., Lossi, N.S., Freemont, P.S., Filloux, A.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.158 
• R-Value Work: 0.151 
• R-Value Observed: 0.151 

Literature

Coevolution of the ATPase Clpv, the Sheath Proteins Tssb and Tssc and the Accessory Protein Tagj/Hsie1 Distinguishes Type Vi Secretion Classes.

Forster, A., Planamente, S., Manoli, E., Lossi, N.S., Freemont, P.S., Filloux, A.

(2014) J Biol Chem 289: 33032

• PubMed: 25305017 
• DOI: 10.1074/jbc.M114.600510
• Primary Citation of Related Structures:  
  4UQW, 4UQX, 4UQY, 4UQZ


• PubMed Abstract: 
  

The type VI secretion system (T6SS) is a bacterial nanomachine for the transport of effector molecules into prokaryotic and eukaryotic cells. It involves the assembly of a tubular structure composed of TssB and TssC that is similar to the tail sheath of bacteriophages. The sheath contracts to provide the energy needed for effector delivery. The AAA(+) ATPase ClpV disassembles the contracted sheath, which resets the systems for reassembly of an extended sheath that is ready to fire again. This mechanism is crucial for T6SS function. In Vibrio cholerae, ClpV binds the N terminus of TssC within a hydrophobic groove. In this study, we resolved the crystal structure of the N-terminal domain of Pseudomonas aeruginosa ClpV1 and observed structural alterations in the hydrophobic groove. The modification in the ClpV1 groove is matched by a change in the N terminus of TssC, suggesting the existence of distinct T6SS classes. An accessory T6SS component, TagJ/HsiE, exists predominantly in one of the classes. Using bacterial two-hybrid approaches, we showed that the P. aeruginosa homolog HsiE1 interacts strongly with ClpV1. We then resolved the crystal structure of HsiE1 in complex with the N terminus of HsiB1, a TssB homolog and component of the contractile sheath. Phylogenetic analysis confirmed that these differences distinguish T6SS classes that resulted from a functional co-evolution between TssB, TssC, TagJ/HsiE, and ClpV. The interaction of TagJ/HsiE with the sheath as well as with ClpV suggests an alternative mode of disassembly in which HsiE recruits the ATPase to the sheath.

---

Organizational Affiliation: 

the Medical Research Council Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HSIE1	A	264	Pseudomonas aeruginosa PAO1	Mutation(s): 0  Gene Names: tagJ, PA0086
UniProt
Find proteins for Q9I746 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore Q9I746  Go to UniProtKB:  Q9I746

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPD	B [auth A], C [auth A]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N
ACT	D [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.20 Å
• R-Value Free: 0.158 
• R-Value Work: 0.151 
• R-Value Observed: 0.151 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56.76	α = 90
b = 45.87	β = 109.98
c = 59.47	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-06-25 
• Released Date: 2014-10-22 
Deposition Author(s): Forster, A., Planamente, S., Manoli, E., Lossi, N.S., Freemont, P.S., Filloux, A.

Revision History  

• Version 1.0: 2014-10-22
  Type: Initial release
  
• Version 1.1: 2014-12-03
  Changes: Database references
• Version 2.0: 2019-10-23
  Changes: Atomic model, Data collection, Other