5JA7

Human cathepsin K mutant C25S in complex with the allosteric effector NSC94914

• PDB DOI: https://doi.org/10.2210/pdb5JA7/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2016-04-12 Released: 2016-11-30 
• Deposition Author(s): Novinec, M., Korenc, M., Lenarcic, B.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.61 Å
• R-Value Free: 0.220 
• R-Value Work: 0.181 
• R-Value Observed: 0.183 

Starting Model: experimental

Literature

An allosteric site enables fine-tuning of cathepsin K by diverse effectors.

Novinec, M., Rebernik, M., Lenarcic, B.

(2016) FEBS Lett 590: 4507-4518

• PubMed: 27859061 
• DOI: https://doi.org/10.1002/1873-3468.12495
• Primary Citation of Related Structures:  
  5JA7, 5JH3


• PubMed Abstract: 
  

  The cysteine peptidase cathepsin K is a potent collagenolytic enzyme and a promising target for the treatment of osteoporosis. Here, we characterize its allosteric fine-tuning via a recently identified allosteric site. We show that compound NSC94914 binds this site and acts as a specific partial inhibitor of the collagenolytic activity of cathepsin K. We link the functional differences between NSC94914 and known effectors (compound NSC11345 and glycosaminoglycans) to their different modes of interaction with the site. We characterize the allosteric site by site-directed mutagenesis and show that it is involved in specific regulation of the collagenolytic activity of cathepsin K.

---

Organizational Affiliation: 

Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Slovenia.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 49.96 kDa 
• Atom Count: 3,939 
• Modelled Residue Count: 445 
• Deposited Residue Count: 446 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cathepsin K	A, B	223	Homo sapiens	Mutation(s): 1  Gene Names: CTSK, CTSO, CTSO2 EC: 3.4.22.38
UniProt & NIH Common Fund Data Resources
Find proteins for P43235 (Homo sapiens) Explore P43235  Go to UniProtKB:  P43235
PHAROS:  P43235 GTEx:  ENSG00000143387

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
6HM	C [auth A], E [auth B]	[([1,1'-biphenyl]-2-yl)methyl]propanedioic acid C16 H14 O4 NRIDIKKHBOBNRS-UHFFFAOYSA-N
SO4	D [auth A], G [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	F [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
ACT	H [auth B]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.61 Å
• R-Value Free: 0.220 
• R-Value Work: 0.181 
• R-Value Observed: 0.183 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 31.62	α = 90
b = 74.07	β = 99.29
c = 90.04	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-11-30 
Deposition Author(s): Novinec, M., Korenc, M., Lenarcic, B.

Revision History  

• Version 1.0: 2016-11-30
  Type: Initial release
  
• Version 1.1: 2017-01-11
  Changes: Database references
• Version 1.2: 2024-01-10
  Changes: Data collection, Database references, Refinement description
• Version 1.3: 2024-10-16
  Changes: Structure summary