Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 48.50 kDa 
• Atom Count: 2981 
• Modelled Residue Count: 372 
• Deposited Residue Count: 420 
• Unique protein chains: 1

1B7E

TRANSPOSASE INHIBITOR

• DOI: 10.2210/pdb1B7E/pdb

• Classification: TRANSFERASE INHIBITOR
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-01-22 Released: 1999-04-21 
• Deposition Author(s): Davies, D.R., Braam, L.M., Reznikoff, W.S., Rayment, I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Work: 0.195 

Literature

The three-dimensional structure of a Tn5 transposase-related protein determined to 2.9A resolution.

Davies, D.R., Braam, L.M., Reznikoff, W.S., Rayment, I.

(1999) J Biol Chem 274: 11904-11913

• PubMed: 10207011 
• DOI: 10.1074/jbc.274.17.11904
• Primary Citation of Related Structures:  
  1B7E


• PubMed Abstract: 
  

Transposon Tn5 employs a unique means of self-regulation by expressing a truncated version of the transposase enzyme that acts as an inhibitor. The inhibitor protein differs from the full-length transposase only by the absence of the first 55 N-terminal amino acid residues. It contains the catalytic active site of transposase and a C-terminal domain involved in protein-protein interactions. The three-dimensional structure of Tn5 inhibitor determined to 2.9-A resolution is reported here. A portion of the protein fold of the catalytic core domain is similar to the folds of human immunodeficiency virus-1 integrase, avian sarcoma virus integrase, and bacteriophage Mu transposase. The Tn5 inhibitor contains an insertion that extends the beta-sheet of the catalytic core from 5 to 9 strands. All three of the conserved residues that make up the "DDE" motif of the active site are visible in the structure. An arginine residue that is strictly conserved among the IS4 family of bacterial transposases is present at the center of the active site, suggesting a catalytic motif of "DDRE." A novel C-terminal domain forms a dimer interface across a crystallographic 2-fold axis. Although this dimer represents the structure of the inhibited complex, it provides insight into the structure of the synaptic complex.

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Organizational Affiliation: 

Institute for Enzyme Research and Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53705, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (TRANSPOSASE INHIBITOR PROTEIN FROM TN5)	A	420	Escherichia coli	Mutation(s): 0  Gene Names: tnpA, tnp EC: 3.1
UniProt
Find proteins for Q46731 (Escherichia coli) Explore Q46731  Go to UniProtKB:  Q46731

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TPT (Subject of Investigation/LOI)	B [auth A], C [auth A]	2,2':6',2''-TERPYRIDINE PLATINUM(II) Chloride C15 H11 Cl N3 Pt XTQMQLRZXBEQCS-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Work: 0.195 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 181.8	α = 90
b = 71.9	β = 90
c = 41.3	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
TNT	refinement
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-01-22 
• Released Date: 1999-04-21 
Deposition Author(s): Davies, D.R., Braam, L.M., Reznikoff, W.S., Rayment, I.

Revision History  

• Version 1.0: 1999-04-21
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description