1CJL

CRYSTAL STRUCTURE OF A CYSTEINE PROTEASE PROFORM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of human procathepsin L reveals the molecular basis of inhibition by the prosegment.

Coulombe, R.Grochulski, P.Sivaraman, J.Menard, R.Mort, J.S.Cygler, M.

(1996) EMBO J. 15: 5492-5503


  • PubMed Abstract: 
  • Cathepsin L is a member of the papain superfamily of cysteine proteases and, like many other proteases, it is synthesized as an inactive proenzyme. Its prosegment shows little homology to that of procathepsin B, whose structure, the first for a cyste ...

    Cathepsin L is a member of the papain superfamily of cysteine proteases and, like many other proteases, it is synthesized as an inactive proenzyme. Its prosegment shows little homology to that of procathepsin B, whose structure, the first for a cysteine protease proenzyme, has been determined recently. We report here the 3-D structure of a mutant of human procathepsin L determined at 2.2 A resolution, describe the mode of binding employed by the prosegment and discuss the molecular basis for other possible roles of the prosegment. The N-terminal part of the prosegment is globular and contains three alpha-helices with a small hydrophobic core built around aromatic side chains. This domain packs against a loop on the enzyme's surface, with the aromatic side chain from the prosegment being located in the center of this loop and providing a large contact area. The C-terminal portion of the prosegment assumes an extended conformation and follows along the substrate binding cleft toward the N-terminus of the mature enzyme. The direction of the prosegment in the substrate binding cleft is opposite to that of substrates. The previously described role of the prosegment in the interactions with membranes is supported by the structure of its N-terminal domain. The fold of the prosegment and the mechanism by which it inhibits the enzymatic activity of procathepsin L is similar to that observed in procathepsin B despite differences in length and sequence, suggesting that this mode of inhibition is common to all enzymes from the papain superfamily.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Diffraction Studies of Human Procathepsin L
      Coulombe, R.,Li, Y.,Takebe, S.,Menard, R.,Mason, P.,Mort, J.S.,Cygler, M.
      (1996) Proteins 25: 398


    Organizational Affiliation

    Biotechnology Research Institute, National Research Council of Canada, Montreal, Quebec.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROCATHEPSIN L
A
312Homo sapiensGene Names: CTSL (CTSL1)
EC: 3.4.22.15
Find proteins for P07711 (Homo sapiens)
Go to Gene View: CTSL
Go to UniProtKB:  P07711
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 40.080α = 90.00
b = 88.090β = 90.00
c = 94.930γ = 90.00
Software Package:
Software NamePurpose
WEISdata reduction
CCP4data scaling
X-PLORmodel building
CCP4data reduction
X-PLORrefinement
X-PLORphasing
WEISSdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-08-12
    Type: Initial release
  • Version 1.1: 2008-03-10
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance