6IRQ

Complexed crystal structure of PaSSB with ssDNA dT25 at 1.91 angstrom resolution

• PDB DOI: https://doi.org/10.2210/pdb6IRQ/pdb
• NAKB: 6IRQ

• Classification: DNA BINDING PROTEIN/DNA
• Organism(s): Pseudomonas aeruginosa PAO1, synthetic construct
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2018-11-14 Released: 2019-12-11 
• Deposition Author(s): Huang, Y.H., Huang, C.Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free: 0.246 
• R-Value Work: 0.213 
• R-Value Observed: 0.215 

Literature

Characterization of an SSB-dT25 complex: structural insights into the S-shaped ssDNA binding conformation.

Huang, Y.H., Chen, I.C., Huang, C.Y.

(2019) RSC Adv 9: 40388-40396

• DOI: https://doi.org/10.1039/C9RA09406G

Biological Assembly 1  

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

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 70.22 kDa 
• Atom Count: 3,881 
• Modelled Residue Count: 437 
• Deposited Residue Count: 534 
• Unique protein chains: 1
• Unique nucleic acid chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Single-stranded DNA-binding protein	A, B, C, D	121	Pseudomonas aeruginosa PAO1	Mutation(s): 0  Gene Names: ssb, PA4232
UniProt
Find proteins for P40947 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore P40947  Go to UniProtKB:  P40947

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (25-MER)	E, F	25	synthetic construct

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free: 0.246 
• R-Value Work: 0.213 
• R-Value Observed: 0.215 
• Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.488	α = 90
b = 60.488	β = 90
c = 131.315	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2019-12-11 
Deposition Author(s): Huang, Y.H., Huang, C.Y.

Revision History  

• Version 1.0: 2019-12-11
  Type: Initial release
  
• Version 1.1: 2020-06-24
  Changes: Database references
• Version 1.2: 2023-11-22
  Changes: Data collection, Database references, Refinement description