1O7D

The structure of the bovine lysosomal a-mannosidase suggests a novel mechanism for low pH activation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.257 

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Literature

The Structure of Bovine Lysosomal Alpha-Mannosidase Suggests a Novel Mechanism for Low-Ph Activation

Heikinheimo, P., Helland, R., Leiros, H.S., Leiros, I., Karlsen, S., Evjen, G., Ravelli, R., Schoehn, G., Ruigrok, R., Tollersrud, O.-K., Mcsweeney, S., Hough, E.

(2003) J Mol Biol 327: 631

  • DOI: 10.1016/s0022-2836(03)00172-4
  • Primary Citation of Related Structures:  
    1O7D

  • PubMed Abstract: 

    • Lysosomal alpha-mannosidase (LAM: EC 3.2.1.24) belongs to the sequence-based glycoside hydrolase family 38 (GH38). Two other mammalian GH38 members, Golgi alpha-mannosidase II (GIIAM) and cytosolic alpha-mannosidase, are expressed in all tissues. In humans, cattle, cat and guinea pig, lack of lysosomal alpha-mannosidase activity causes the autosomal recessive disease alpha-mannosidosis ...

    Lysosomal alpha-mannosidase (LAM: EC 3.2.1.24) belongs to the sequence-based glycoside hydrolase family 38 (GH38). Two other mammalian GH38 members, Golgi alpha-mannosidase II (GIIAM) and cytosolic alpha-mannosidase, are expressed in all tissues. In humans, cattle, cat and guinea pig, lack of lysosomal alpha-mannosidase activity causes the autosomal recessive disease alpha-mannosidosis. Here, we describe the three-dimensional structure of bovine lysosomal alpha-mannosidase (bLAM) at 2.7A resolution and confirm the solution state dimer by electron microscopy. We present the first structure of a mammalian GH38 enzyme that offers indications for the signal areas for mannose phosphorylation, suggests a previously undetected mechanism of low-pH activation and provides a template for further biochemical studies of the family 38 glycoside hydrolases as well as lysosomal transport. Furthermore, it provides a basis for understanding the human form of alpha-mannosidosis at the atomic level. The atomic coordinates and structure factors have been deposited in the Protein Data Bank (accession codes 1o7d and r1o7dsf).

    Related Citations: 
    • Purification of Bovine Lysosomal A-Mannosidase, Characterization of its Gene and Determination of Two Mutations that Cause A- Mannosidosis
      Tollersrud, O.-K., Berg, T., Healy, P., Evjen, G., Ramachandran, U.
      (1997) Eur J Biochem 246: 410
    Organizational Affiliation: 

    Institutt for Kjemi, Universitetet i Tromsø, N-9037, Tromsø, Norway.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal alpha-mannosidaseA298Bos taurusMutation(s): 0 
Gene Names: MAN2B1, MANB
EC: 3.2.1.24
UniProt
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Go to UniProtKB:  Q29451
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UniProt GroupQ29451
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal alpha-mannosidaseB84Bos taurusMutation(s): 0 
Gene Names: MAN2B1, MANB
EC: 3.2.1.24
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal alpha-mannosidaseC159Bos taurusMutation(s): 0 
Gene Names: MAN2B1, MANB
EC: 3.2.1.24
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal alpha-mannosidaseD282Bos taurusMutation(s): 0 
Gene Names: MAN2B1, MANB
EC: 3.2.1.24
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Lysosomal alpha-mannosidaseE126Bos taurusMutation(s): 0 
Gene Names: MAN2B1, MANB
EC: 3.2.1.24
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Oligosaccharides

Help

Entity ID: 6
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseF 9N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G83161QT
GlyCosmos:  G83161QT
GlyGen:  G83161QT
Entity ID: 7
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseG, H, I 2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
J [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
TRS
Query on TRS
Download Ideal Coordinates CCD File 
K [auth A]2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O		 Ligand Interaction
SO4
Query on SO4
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M [auth A],
N [auth E]		SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
ZN
Query on ZN
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L [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.257 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.88α = 90
b = 117.88β = 90
c = 582.04γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-03-20
    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: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary