1SRE

CRYSTALLOGRAPHIC AND THERMODYNAMIC COMPARISON OF NATURAL AND SYNTHETIC LIGANDS BOUND TO STREPTAVIDIN

• PDB DOI: https://doi.org/10.2210/pdb1SRE/pdb

• Classification: BIOTIN-BINDING PROTEIN
• Organism(s): Streptomyces avidinii
• Mutation(s): No 


• Deposited: 1994-02-17 Released: 1994-11-01 
• Deposition Author(s): Weber, P.C., Salemme, F.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.78 Å
• R-Value Observed: 0.181 

Literature

Structure-Based Design of Synthetic Azobenzene Ligands for Streptavidin

Weber, P.C., Pantoliano, M.W., Simons, D.M., Salemme, F.R.

(1994) J Am Chem Soc 116: 2717-2724

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 2  

Global Symmetry: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 8-mer - A8 

Biological assembly 2 generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 25.96 kDa 
• Atom Count: 1,962 
• Modelled Residue Count: 235 
• Deposited Residue Count: 242 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
STREPTAVIDIN	A, B	121	Streptomyces avidinii	Mutation(s): 0
UniProt
Find proteins for P22629 (Streptomyces avidinii) Explore P22629  Go to UniProtKB:  P22629

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HAB	C [auth A], D [auth B]	2-((4'-HYDROXYPHENYL)-AZO)BENZOIC ACID C13 H10 N2 O3 DWQOTEPNRWVUDA-CCEZHUSRSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
HAB	PDBBind:  1SRE	Kd: 1.40e+5 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.78 Å
• R-Value Observed: 0.181 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 95.2	α = 90
b = 106.5	β = 90
c = 47.9	γ = 90

Software Package:

Software Name	Purpose
PROFFT	refinement
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-11-01 
Deposition Author(s): Weber, P.C., Salemme, F.R.

Revision History  

• Version 1.0: 1994-11-01
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2012-10-10
  Changes: Other