1BY8

THE CRYSTAL STRUCTURE OF HUMAN PROCATHEPSIN K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.344 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The crystal structure of human procathepsin K.

LaLonde, J.M.Zhao, B.Janson, C.A.D'Alessio, K.J.McQueney, M.S.Orsini, M.J.Debouck, C.M.Smith, W.W.

(1999) Biochemistry 38: 862-869

  • DOI: 10.1021/bi9822271

  • PubMed Abstract: 
  • Cathepsin K is a cysteine protease present in human osteoclasts that plays an important role in bone resorption. Cathepsin K is synthesized as an inactive proenzyme and activated under conditions of low pH. Autoproteolytic processing of the N-termina ...

    Cathepsin K is a cysteine protease present in human osteoclasts that plays an important role in bone resorption. Cathepsin K is synthesized as an inactive proenzyme and activated under conditions of low pH. Autoproteolytic processing of the N-terminal 99 amino acid propeptide produces the active, mature form of cathepsin K. It is presumed that the activation of procathepsin K in vivo occurs in the bone resorption pit, which has a low-pH environment. We have determined the structure of human procathepsin K at 2.8 A resolution. The structure of the mature enzyme domain within procathepsin K is virtually identical to that of mature cathepsin K. The fold of the propeptide of procathepsin K is similar to that observed in procathepsins B and L despite differences in length and sequence. A portion of the propeptide occupies the active site cleft of cathepsin K. Hydrophobic interactions, salt bridges, and hydrogen-bonding interactions are observed in the structure of the propeptide and between the propeptide and the mature enzyme of procathepsin K. These interactions suggest an explanation for the stability of the proenzyme. The structure of procathepsin K contributes to an understanding of the molecular basis of inhibition by the propeptide portion of the molecule and activation of this important member of the cysteine protease family.


    Organizational Affiliation

    Department of Structural Biology, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (PROCATHEPSIN K)
A
314Homo sapiensGene Names: CTSK (CTSO, CTSO2)
EC: 3.4.22.38
Find proteins for P43235 (Homo sapiens)
Go to Gene View: CTSK
Go to UniProtKB:  P43235
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.344 
  • R-Value Work: 0.214 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 56.780α = 90.00
b = 156.550β = 90.00
c = 96.260γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
X-GENdata reduction
X-GENdata scaling
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-10-24
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description