Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 34.81 kDa 
• Atom Count: 1938 
• Residue Count: 232 
• Unique protein chains: 1

1UE1

Crystal structure of the single-stranded dna-binding protein from mycobacterium tuberculosis

• DOI: 10.2210/pdb1UE1/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Mycobacterium tuberculosis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2003-05-08 Released: 2004-02-10 
• Deposition Author(s): Saikrishnan, K., Jeyakanthan, J., Venkatesh, J., Acharya, N., Sekar, K., Varshney, U., Vijayan, M., TB Structural Genomics Consortium (TBSGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.288 
• R-Value Work: 0.228 
• R-Value Observed: 0.228 

Literature

Structure of Mycobacterium tuberculosis single-stranded DNA-binding protein. Variability in quaternary structure and its implications

Saikrishnan, K., Jeyakanthan, J., Venkatesh, J., Acharya, N., Sekar, K., Varshney, U., Vijayan, M.

(2003) J Mol Biol 331: 385-393

• PubMed: 12888346 
• DOI: 10.1016/s0022-2836(03)00729-0
• Primary Citation of Related Structures:  
  1UE7, 1UE6, 1UE5, 1UE1


• PubMed Abstract: 
  

Single-stranded DNA-binding protein (SSB) is an essential protein necessary for the functioning of the DNA replication, repair and recombination machineries. Here we report the structure of the DNA-binding domain of Mycobacterium tuberculosis SSB (MtuSSB) in four different crystals distributed in two forms. The structure of one of the forms was solved by a combination of isomorphous replacement and anomalous scattering. This structure was used to determine the structure of the other form by molecular replacement. The polypeptide chain in the structure exhibits the oligonucleotide binding fold. The globular core of the molecule in different subunits in the two forms and those in Escherichia coli SSB (EcoSSB) and human mitochondrial SSB (HMtSSB) have similar structure, although the three loops exhibit considerable structural variation. However, the tetrameric MtuSSB has an as yet unobserved quaternary association. This quaternary structure with a unique dimeric interface lends the oligomeric protein greater stability, which may be of significance to the functioning of the protein under conditions of stress. Also, as a result of the variation in the quaternary structure the path adopted by the DNA to wrap around MtuSSB is expected to be different from that of EcoSSB.

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Related Citations: 

• Crystallization and preliminary X-ray studies of the single-stranded DNA-binding protein from Mycobacterium tuberculosis.
  Saikrishnan, K., Jeyakanthan, J., Venkatesh, J., Acharya, N., Purnapatre, K., Sekar, K., Varshney, U., Vijayan, M.
  (2002) Acta Crystallogr D Biol Crystallogr 58: 327

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Organizational Affiliation: 

Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Single-strand binding protein	A, B	164	Mycobacterium tuberculosis	Mutation(s): 0
Find proteins for P9WGD5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WGD5  Go to UniProtKB:  P9WGD5

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.288 
• R-Value Work: 0.228 
• R-Value Observed: 0.228 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 78.72	α = 90
b = 78.72	β = 90
c = 77.16	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
MLPHARE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-05-08 
• Released Date: 2004-02-10 
Deposition Author(s): Saikrishnan, K., Jeyakanthan, J., Venkatesh, J., Acharya, N., Sekar, K., Varshney, U., Vijayan, M., TB Structural Genomics Consortium (TBSGC)

Revision History 

• Version 1.0: 2004-02-10
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance