Biological Assembly 1  

 3D View: Structure | Electron Density

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PISA (software)

Biological Assembly Evidence: gel filtration, SAXS

Macromolecule Content

• Total Structure Weight: 99650.88 
• Atom Count: 5857 
• Residue Count: 722 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

6EN0

Structure of the Tn1549 transposon Integrase (aa 82-397) in complex with circular intermediate DNA (CI5-DNA)

• DOI: 10.2210/pdb6EN0/pdb

• Classification: RECOMBINATION
• Organism(s): Clostridioides difficile, Enterococcus faecalis
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2017-10-04 Released: 2018-04-04 
• Deposition Author(s): Rubio-Cosials, A., Barabas, O.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.254 
• R-Value Work: 0.227 

Literature

Transposase-DNA Complex Structures Reveal Mechanisms for Conjugative Transposition of Antibiotic Resistance.

Rubio-Cosials, A., Schulz, E.C., Lambertsen, L., Smyshlyaev, G., Rojas-Cordova, C., Forslund, K., Karaca, E., Bebel, A., Bork, P., Barabas, O.

(2018) Cell 173: 208-220.e20

• PubMed: 29551265 
• DOI: 10.1016/j.cell.2018.02.032
• Primary Citation of Related Structures:  
  6EMY, 6EN2, 6EN1, 6EMZ


• PubMed Abstract: 
  

Conjugative transposition drives the emergence of multidrug resistance in diverse bacterial pathogens, yet the mechanisms are poorly characterized. The Tn1549 conjugative transposon propagates resistance to the antibiotic vancomycin used for severe drug-resistant infections. Here, we present four high-resolution structures of the conserved Y-transposase of Tn1549 complexed with circular transposon DNA intermediates. The structures reveal individual transposition steps and explain how specific DNA distortion and cleavage mechanisms enable DNA strand exchange with an absolute minimum homology requirement. This appears to uniquely allow Tn916-like conjugative transposons to bypass DNA homology and insert into diverse genomic sites, expanding gene transfer. We further uncover a structural regulatory mechanism that prevents premature cleavage of the transposon DNA before a suitable target DNA is found and generate a peptide antagonist that interferes with the transposase-DNA structure to block transposition. Our results reveal mechanistic principles of conjugative transposition that could help control the spread of antibiotic resistance genes.

---

Organizational Affiliation: 

Structural and Computational Biology Unit, European Molecular Biology Laboratory (EMBL), 69117 Heidelberg, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Int protein	A, B	317	Enterococcus faecalis	Mutation(s): 0  Gene Names: int
Find proteins for Q7BP35 (Enterococcus faecalis) Go to UniProtKB:  Q7BP35

Entity ID: 2
Molecule	Chains	Length	Organism
DNA (44-MER)	C	44	Clostridioides difficile

Entity ID: 3
Molecule	Chains	Length	Organism
DNA (44-MER)	E	44	Clostridioides difficile

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.254 
• R-Value Work: 0.227 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 77.660	α = 90.00
b = 124.320	β = 117.69
c = 77.400	γ = 90.00

Software Package:

Software Name	Purpose
PHASER	phasing
Coot	model building
XDS	data reduction
XDS	data scaling
PHENIX	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2017-10-04 
• Released Date: 2018-04-04 
• Deposition Author(s): Rubio-Cosials, A., Barabas, O.

Revision History 

• Version 1.0: 2018-04-04
  Type: Initial release