4MWT

Crystal structure of human PPCA (trigonal crystal form 2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.85 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.323 
  • R-Value Observed: 0.323 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Proteolytic activation of human cathepsin A.

Kolli, N.Garman, S.C.

(2014) J Biol Chem 289: 11592-11600

  • DOI: 10.1074/jbc.M113.524280
  • Primary Citation of Related Structures:  
    4MWS, 4MWT

  • PubMed Abstract: 
  • Galactosialidosis is a human lysosomal storage disease caused by deficiency in the multifunctional lysosomal protease cathepsin A (also known as protective protein/cathepsin A, PPCA, catA, HPP, and CTSA; EC 3.4.16.5). Previous structural work on the inactive precursor human cathepsin A (zymogen) led to a two-stage model for activation, where proteolysis of a 1 ...

    Galactosialidosis is a human lysosomal storage disease caused by deficiency in the multifunctional lysosomal protease cathepsin A (also known as protective protein/cathepsin A, PPCA, catA, HPP, and CTSA; EC 3.4.16.5). Previous structural work on the inactive precursor human cathepsin A (zymogen) led to a two-stage model for activation, where proteolysis of a 1.6-kDa excision peptide is followed by a conformational change in a blocking peptide occluding the active site. Here we present evidence for an alternate model of activation of human cathepsin A, needing only cleavage of a 3.3-kDa excision peptide to yield full enzymatic activity, with no conformational change required. We present x-ray crystallographic, mass spectrometric, amino acid sequencing, enzymatic, and cellular data to support the cleavage-only activation model. The results clarify a longstanding question about the mechanism of cathepsin A activation and point to new avenues for the design of mechanism-based inhibitors of the enzyme.


    Organizational Affiliation

    From the Department of Biochemistry and Molecular Biology and.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal protective proteinA, B428Homo sapiensMutation(s): 0 
Gene Names: CTSAPPGB
EC: 3.4.16.5
UniProt & NIH Common Fund Data Resources
Find proteins for P10619 (Homo sapiens)
Explore P10619 
Go to UniProtKB:  P10619
PHAROS:  P10619
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
D [auth A], E [auth B], F [auth B]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.85 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.323 
  • R-Value Observed: 0.323 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 134.575α = 90
b = 134.575β = 90
c = 99.776γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-12
    Type: Initial release
  • Version 1.1: 2015-04-15
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary