4KKD

The X-ray crystal structure of Mannose-binding lectin-associated serine proteinase-3 reveals the structural basis for enzyme inactivity associated with the 3MC syndrome


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5991 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The X-ray Crystal Structure of Mannose-binding Lectin-associated Serine Proteinase-3 Reveals the Structural Basis for Enzyme Inactivity Associated with the Carnevale, Mingarelli, Malpuech, and Michels (3MC) Syndrome.

Yongqing, T.Wilmann, P.G.Reeve, S.B.Coetzer, T.H.Smith, A.I.Whisstock, J.C.Pike, R.N.Wijeyewickrema, L.C.

(2013) J.Biol.Chem. 288: 22399-22407

  • DOI: 10.1074/jbc.M113.483875

  • PubMed Abstract: 
  • The mannose-binding lectin associated-protease-3 (MASP-3) is a member of the lectin pathway of the complement system, a key component of human innate and active immunity. Mutations in MASP-3 have recently been found to be associated with Carnevale, M ...

    The mannose-binding lectin associated-protease-3 (MASP-3) is a member of the lectin pathway of the complement system, a key component of human innate and active immunity. Mutations in MASP-3 have recently been found to be associated with Carnevale, Mingarelli, Malpuech, and Michels (3MC) syndrome, a severe developmental disorder manifested by cleft palate, intellectual disability, and skeletal abnormalities. However, the molecular basis for MASP-3 function remains to be understood. Here we characterize the substrate specificity of MASP-3 by screening against a combinatorial peptide substrate library. Through this approach, we successfully identified a peptide substrate that was 20-fold more efficiently cleaved than any other identified to date. Furthermore, we demonstrated that mutant forms of the enzyme associated with 3MC syndrome were completely inactive against this substrate. To address the structural basis for this defect, we determined the 2.6-Å structure of the zymogen form of the G666E mutant of MASP-3. These data reveal that the mutation disrupts the active site and perturbs the position of the catalytic serine residue. Together, these insights into the function of MASP-3 reveal how a mutation in this enzyme causes it to be inactive and thus contribute to the 3MC syndrome.


    Organizational Affiliation

    Department of Biochemistry & Molecular Biology, Monash University, Clayton, Victoria 3800, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mannan-binding lectin serine protease 1
A, B
433Homo sapiensMutation(s): 1 
Gene Names: MASP1 (CRARF, CRARF1, PRSS5)
EC: 3.4.21.-
Find proteins for P48740 (Homo sapiens)
Go to Gene View: MASP1
Go to UniProtKB:  P48740
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
IMD
Query on IMD

Download SDF File 
Download CCD File 
B
IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5991 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.194 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 72.840α = 90.00
b = 292.916β = 90.00
c = 43.589γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
ADSCdata collection
PHENIXrefinement
Auto-Rickshawphasing
pointlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-03
    Type: Initial release
  • Version 1.1: 2013-07-10
    Type: Structure summary
  • Version 1.2: 2013-08-21
    Type: Database references