5Z5O

Structure of Pycnonodysostosis disease related I249T mutant of human cathepsin K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.164 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Not all pycnodysostosis-related mutants of human cathepsin K are inactive - crystal structure and biochemical studies of an active mutant I249T.

Roy, S.Das Chakraborty, S.Biswas, S.

(2018) FEBS J 285: 4265-4280

  • DOI: https://doi.org/10.1111/febs.14655
  • Primary Citation of Related Structures:  
    5Z5O

  • PubMed Abstract: 

    Human cathepsin K (CTSK) is a collagenolytic lysosomal cysteine protease that plays an important role in bone turnover. Mutation in CTSK gene is associated with loss of collagenolytic activity of CTSK leading to an autosomal recessive bone disorder called pycnodysostosis. Although a number of pycnodysostotic missense mutations have been reported, underlying mechanism of the disease is not clear. In this study, we investigated in vitro six recombinant pycnodysostosis-related mutants of human CTSK (G79E, I249T, G243E, G303E, G319C and Q187P). While all the mutants, like wild-type, show similar high levels of expression in Escherichia coli, four of them (G79E, G303E, G319C and Q187P) are inactive, unstable and spontaneously degrade during purification process. In contrast, proteolytic/collagenolytic activity, zymogen activation kinetics and stability of G243E and I249T mutants are nominally affected. Crystal structure of I249T at 1.92 Å resolution shows that the mutation in R-domain causes conformational changes of a surface loop in the L-domain although the catalytic cleft remains unaltered. Molecular simulation, normal mode analysis and fluorescence lifetime measurement eliminated the possibility that the change in L-domain surface loop orientation is a crystallization artefact. CD-based thermal melting profile indicates that stability of I249T is significantly higher than wild-type. Our studies first time reports that pycnodysostosis-related mutations do not always lead to complete loss of general proteolytic activity or specific collagenolytic activity of CTSK. The first crystal structure of a pycnodysostotic mutant (I249T) provides critical information that may pave new avenues towards understanding the disease at molecular level. DATABASE: The atomic co-ordinates and structure factors for I249T mutant of human CTSK (codes 5Z5O) have been deposited in the Protein Data Bank (http://wwpdb.org/).


  • Organizational Affiliation

    Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, Kolkata, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cathepsin K335Homo sapiensMutation(s): 2 
Gene Names: CTSKCTSOCTSO2
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 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43235
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Cathepsin K94Homo sapiensMutation(s): 0 
Gene Names: CTSKCTSOCTSO2
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 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43235
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MPD
Query on MPD

Download Ideal Coordinates CCD File 
OA [auth B],
PA [auth B],
QA [auth B]
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
PEG
Query on PEG

Download Ideal Coordinates CCD File 
AA [auth A]
BA [auth A]
CA [auth A]
NA [auth B]
X [auth A]
AA [auth A],
BA [auth A],
CA [auth A],
NA [auth B],
X [auth A],
Y [auth A],
Z [auth A]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
JA [auth B],
KA [auth B],
LA [auth B],
MA [auth B],
W [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
FA [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
FA [auth B],
G [auth A],
H [auth A],
I [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
GA [auth B]
HA [auth B]
IA [auth B]
J [auth A]
K [auth A]
GA [auth B],
HA [auth B],
IA [auth B],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CL
Query on CL

Download Ideal Coordinates CCD File 
DA [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

Download Ideal Coordinates CCD File 
EA [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
SEB
Query on SEB
A
L-PEPTIDE LINKINGC10 H13 N O5 SSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.164 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.1α = 90
b = 67.27β = 91.83
c = 82.87γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
PDB_EXTRACTdata extraction
pointlessdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
DSTIndia--

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2018-12-12
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description