3NXJ

Crystal Structure of Ketosteroid Isomerase D99N from Pseudomonas Testosteroni (tKSI)

• PDB DOI: https://doi.org/10.2210/pdb3NXJ/pdb

• Classification: ISOMERASE
• Organism(s): Comamonas testosteroni
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2010-07-13 Released: 2011-08-03 
• Deposition Author(s): Gonzalez, A., Tsai, Y., Schwans, J., Sunden, F., Herschlag, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.97 Å
• R-Value Free: 0.314 
• R-Value Work: 0.252 
• R-Value Observed: 0.255 

Starting Model: experimental

Literature

Crystal Structure of Ketosteroid Isomerase D99N from Pseudomonas Testosteroni (tKSI)

Schwans, J., Sunden, F., Gonzalez, A., Tsai, Y., Herschlag, D.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 27.3 kDa 
• Atom Count: 2,215 
• Modelled Residue Count: 250 
• Deposited Residue Count: 250 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Steroid Delta-isomerase	A, B	125	Comamonas testosteroni	Mutation(s): 1  Gene Names: ksi EC: 5.3.3.1
UniProt
Find proteins for P00947 (Comamonas testosteroni) Explore P00947  Go to UniProtKB:  P00947

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A], D [auth A], E [auth B], F [auth B], G [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.97 Å
• R-Value Free: 0.314 
• R-Value Work: 0.252 
• R-Value Observed: 0.255 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.357	α = 90
b = 104.786	β = 90
c = 141.435	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
Blu-Ice	data collection
Web-Ice	data collection
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-08-03 
Deposition Author(s): Gonzalez, A., Tsai, Y., Schwans, J., Sunden, F., Herschlag, D.

Revision History  

• Version 1.0: 2011-08-03
  Type: Initial release
  
• Version 1.1: 2017-11-08
  Changes: Refinement description
• Version 1.2: 2023-09-06
  Changes: Data collection, Database references, Derived calculations, Refinement description