7JOW | pdb_00007jow

Crystal structure of BbKI complexed with Human Kallikrein 4

• PDB DOI: https://doi.org/10.2210/pdb7JOW/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Homo sapiens, Bauhinia bauhinioides
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2020-08-07 Released: 2021-07-21 
• Deposition Author(s): Li, M., Wlodawer, A., Gustchina, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free: 
  0.207 (Depositor), 0.210 (DCC) 
• R-Value Work: 
  0.174 (Depositor), 0.180 (DCC) 
• R-Value Observed: 
  0.175 (Depositor) 

Starting Model: experimental

Literature

Structural studies of complexes of kallikrein 4 with wild-type and mutated forms of the Kunitz-type inhibitor BbKI

Li, M., Srp, J., Mares, M., Wlodawer, A., Gustchina, A.

(2021) Acta Crystallogr D Biol Crystallogr 77: 1084-1098

• DOI: https://doi.org/10.1107/S2059798321006483

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 42.44 kDa 
• Atom Count: 3,207 
• Modeled Residue Count: 387 
• Deposited Residue Count: 387 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kallikrein 4 (Prostase, enamel matrix, prostate), isoform CRA_a	A [auth E]	223	Homo sapiens	Mutation(s): 0  Gene Names: KLK4, KLNB1, hCG_1641510 EC: 3.4.21
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y5K2 (Homo sapiens) Explore Q9Y5K2  Go to UniProtKB:  Q9Y5K2
PHAROS:  Q9Y5K2 GTEx:  ENSG00000167749

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Kunitz-type inihibitor	B [auth I]	164	Bauhinia bauhinioides	Mutation(s): 0
UniProt
Find proteins for P83052 (Bauhinia bauhinioides) Explore P83052  Go to UniProtKB:  P83052

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
2PE	D [auth I]	NONAETHYLENE GLYCOL C18 H38 O10 YZUUTMGDONTGTN-UHFFFAOYSA-N
CD	C [auth E]	CADMIUM ION Cd WLZRMCYVCSSEQC-UHFFFAOYSA-N
URE	E [auth I]	UREA C H4 N2 O XSQUKJJJFZCRTK-UHFFFAOYSA-N
CL	F [auth I]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.91 Å
• R-Value Free:  0.207 (Depositor), 0.210 (DCC) 
• R-Value Work:  0.174 (Depositor), 0.180 (DCC) 
• R-Value Observed: 0.175 (Depositor) 

Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 100.495	α = 90
b = 100.495	β = 90
c = 167.298	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-3000	data reduction
HKL-3000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2021-07-21 
Deposition Author(s): Li, M., Wlodawer, A., Gustchina, A.

Revision History  

• Version 1.0: 2021-07-21
  Type: Initial release
  
• Version 1.1: 2021-08-11
  Changes: Database references
• Version 1.2: 2023-10-18
  Changes: Data collection, Refinement description
• Version 1.3: 2024-10-30
  Changes: Structure summary