1ECR

ESCHERICHIA COLI REPLICATION TERMINATOR PROTEIN (TUS) COMPLEXED WITH DNA

• PDB DOI: https://doi.org/10.2210/pdb1ECR/pdb
• NAKB: 1ECR

• Classification: REPLICATION/DNA
• Organism(s): Escherichia coli B
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1996-09-01 Released: 1997-09-05 
• Deposition Author(s): Kamada, K., Morikawa, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.314 
• R-Value Work: 0.196 
• R-Value Observed: 0.196 

Literature

Structure of a replication-terminator protein complexed with DNA.

Kamada, K., Horiuchi, T., Ohsumi, K., Shimamoto, N., Morikawa, K.

(1996) Nature 383: 598-603

• PubMed: 8857533 
• DOI: https://doi.org/10.1038/383598a0
• Primary Citation of Related Structures:  
  1ECR


• PubMed Abstract: 
  

  The crystal structure of the Escherichia coli replication-terminator protein (Tus) bound to terminus-site (Ter) DNA has been determined at 2.7 A resolution. The Tus protein folds into a previously undescribed architecture divided into two domains by a central basic cleft. This cleft accommodates locally deformed B-form Ter DNA and makes extensive contacts with the major groove, mainly through two interdomain beta-strands. The unusual structural features of this complex may explain how the replication fork is halted in only one direction.

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Organizational Affiliation: 

Department of Genetics, The Graduate University for Advanced Studies, and National Institute of Genetics, Shizuoka, Japan.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 45.63 kDa 
• Atom Count: 3,152 
• Modelled Residue Count: 335 
• Deposited Residue Count: 341 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (REPLICATION-TERMINATOR PROTEIN)	C [auth A]	309	Escherichia coli B	Mutation(s): 0
UniProt
Find proteins for P16525 (Escherichia coli (strain K12)) Explore P16525  Go to UniProtKB:  P16525

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*TP*TP*AP*GP*TP*TP*AP*CP*AP*AP*CP*AP*TP*AP*CP*T)-3	A [auth B]	16	N/A

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*TP*AP*GP*TP*AP*TP*GP*TP*TP*GP*TP*AP*AP*CP*TP*A)-3	B [auth C]	16	N/A

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.314 
• R-Value Work: 0.196 
• R-Value Observed: 0.196 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 68.15	α = 90
b = 68.15	β = 90
c = 230.72	γ = 90

Software Package:

Software Name	Purpose
CCP4	model building
X-PLOR	refinement
MACDENZO	data reduction
MACDENZO	data scaling
CCP4	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-09-05 
Deposition Author(s): Kamada, K., Morikawa, K.

Revision History  

• Version 1.0: 1997-09-05
  Type: Initial release
  
• Version 1.1: 2008-05-22
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 1.3: 2024-02-07
  Changes: Data collection, Database references