3A5U

Promiscuity and specificity in DNA binding to SSB: Insights from the structure of the Mycobacterium smegmatis SSB-ssDNA complex

• PDB DOI: https://doi.org/10.2210/pdb3A5U/pdb
• NAKB: 3A5U

• Classification: DNA BINDING PROTEIN
• Organism(s): Mycolicibacterium smegmatis MC2 155
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-08-12 Released: 2010-08-18 
• Deposition Author(s): Kaushal, P.S., Manjunath, G.P., Sekar, K., Muniyappa, K., Vijayan, M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.283 
• R-Value Work: 0.238 
• R-Value Observed: 0.240 

Starting Model: experimental

Literature

Promiscuity and specificity in DNA binding to SSB: Insights from the structure of the Mycobacterium smegmatis SSB-ssDNA complex.

Kaushal, P.S., Manjunath, G.P., Sekar, K., Muniyappa, K., Vijayan, M.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 37.01 kDa 
• Atom Count: 2,236 
• Modelled Residue Count: 261 
• Deposited Residue Count: 291 
• 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	130	Mycolicibacterium smegmatis MC2 155	Mutation(s): 0  Gene Names: ssb
UniProt
Find proteins for Q9AFI5 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155)) Explore Q9AFI5  Go to UniProtKB:  Q9AFI5

Entity ID: 2
Molecule	Chains	Length	Organism	Image
DNA (31-MER)	C	31	N/A

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.283 
• R-Value Work: 0.238 
• R-Value Observed: 0.240 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 112.33	α = 90
b = 112.33	β = 90
c = 48.49	γ = 90

Software Package:

Software Name	Purpose
MAR345dtb	data collection
PHASER	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-08-18 
Deposition Author(s): Kaushal, P.S., Manjunath, G.P., Sekar, K., Muniyappa, K., Vijayan, M.

Revision History  

• Version 1.0: 2010-08-18
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-11-01
  Changes: Data collection, Database references, Refinement description