4MWS

Crystal structure of human PPCA (trigonal crystal form 1)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.149 

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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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal protective proteinA, B428Homo sapiensMutation(s): 0 
Gene Names: CTSA, PPGB
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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10619
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranoseC 5N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G17689EW
GlyCosmos:  G17689EW
GlyGen:  G17689EW
Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranoseD 4N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G18638YB
GlyCosmos:  G18638YB
GlyGen:  G18638YB
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
E [auth A],
G [auth B]		2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
F [auth A],
H [auth B]		GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.149 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 134.889α = 90
b = 134.889β = 90
c = 99.805γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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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