Crystal structure of an Arylsulfatase A mutant P426L

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 

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Defective oligomerization of arylsulfatase a as a cause of its instability in lysosomes and metachromatic leukodystrophy.

von Bulow, R.Schmidt, B.Dierks, T.Schwabauer, N.Schilling, K.Weber, E.Uson, I.von Figura, K.

(2002) J Biol Chem 277: 9455-9461

  • DOI: https://doi.org/10.1074/jbc.M111993200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In one of the most common mutations causing metachromatic leukodystrophy, the P426L-allele of arylsulfatase A (ASA), the deficiency of ASA results from its instability in lysosomes. Inhibition of lysosomal cysteine proteinases protects the P426L-ASA and restores the sulfatide catabolism in fibroblasts of the patients. P426L-ASA, but not wild type ASA, was cleaved by purified cathepsin L at threonine 421 yielding 54- and 9-kDa fragments. X-ray crystallography at 2.5-A resolution showed that cleavage is not due to a difference in the protein fold that would expose the peptide bond following threonine 421 to proteases. Octamerization, which depends on protonation of Glu-424, was impaired for P426L-ASA. The mutation lowers the pH for the octamer/dimer equilibrium by 0.6 pH units from pH 5.8 to 5.2. A second oligomerization mutant (ASA-A464R) was generated that failed to octamerize even at pH 4.8. A464R-ASA was degraded in lysosomes to catalytically active 54-kDa intermediate. In cathepsin L-deficient fibroblasts, degradation of P426L-ASA and A464R-ASA to the 54-kDa fragment was reduced, while further degradation was blocked. This indicates that defective oligomerization of ASA allows degradation of ASA to a catalytically active 54-kDa intermediate by lysosomal cysteine proteinases, including cathepsin L. Further degradation of the 54-kDa intermediate critically depends on cathepsin L and is modified by the structure of the 9-kDa cleavage product.

  • Organizational Affiliation

    Georg-August-Universität Göttingen, Abt. Biochemie II, Heinrich-Düker-Weg 12, Göttingen 37073, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Arylsulfatase AA [auth P]489Homo sapiensMutation(s): 1 
Gene Names: ARSA
UniProt & NIH Common Fund Data Resources
Find proteins for P15289 (Homo sapiens)
Explore P15289 
Go to UniProtKB:  P15289
PHAROS:  P15289
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15289
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseB [auth A]2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MG

Download Ideal Coordinates CCD File 
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on DDZ
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.187 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.4α = 90
b = 131.4β = 90
c = 192γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-05-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2018-07-11
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Source and taxonomy, Structure summary
  • Version 3.0: 2019-04-24
    Changes: Data collection, Derived calculations, Polymer sequence
  • Version 3.1: 2019-05-08
    Changes: Data collection, Experimental preparation
  • Version 3.2: 2019-05-22
    Changes: Data collection, Experimental preparation, Refinement description
  • Version 3.3: 2019-07-10
    Changes: Data collection
  • Version 3.4: 2019-07-24
    Changes: Data collection
  • Version 4.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary