4DJZ

Catalytic fragment of masp-1 in complex with its specific inhibitor developed by directed evolution on sgci scaffold


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Monospecific Inhibitors Show That Both Mannan-binding Lectin-associated Serine Protease-1 (MASP-1) and -2 Are Essential for Lectin Pathway Activation and Reveal Structural Plasticity of MASP-2.

Heja, D.Harmat, V.Fodor, K.Wilmanns, M.Dobo, J.Kekesi, K.A.Zavodszky, P.Gal, P.Pal, G.

(2012) J.Biol.Chem. 287: 20290-20300

  • DOI: 10.1074/jbc.M112.354332
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The lectin pathway is an antibody-independent activation route of the complement system. It provides immediate defense against pathogens and altered self-cells, but it also causes severe tissue damage after stroke, heart attack, and other ischemia re ...

    The lectin pathway is an antibody-independent activation route of the complement system. It provides immediate defense against pathogens and altered self-cells, but it also causes severe tissue damage after stroke, heart attack, and other ischemia reperfusion injuries. The pathway is triggered by target binding of pattern recognition molecules leading to the activation of zymogen mannan-binding lectin-associated serine proteases (MASPs). MASP-2 is considered as the autonomous pathway-activator, while MASP-1 is considered as an auxiliary component. We evolved a pair of monospecific MASP inhibitors. In accordance with the key role of MASP-2, the MASP-2 inhibitor completely blocks the lectin pathway activation. Importantly, the MASP-1 inhibitor does the same, demonstrating that MASP-1 is not an auxiliary but an essential pathway component. We report the first Michaelis-like complex structures of MASP-1 and MASP-2 formed with substrate-like inhibitors. The 1.28 Å resolution MASP-2 structure reveals significant plasticity of the protease, suggesting that either an induced fit or a conformational selection mechanism should contribute to the extreme specificity of the enzyme.


    Organizational Affiliation

    Department of Biochemistry, Eötvös Loránd University, 1/C Pázmány Péter Street, H-1117, Budapest, Hungary.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mannan-binding lectin serine protease 1 heavy chain
A, C
155Homo sapiensMutation(s): 0 
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
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Mannan-binding lectin serine protease 1 light chain
B, D
251Homo sapiensMutation(s): 0 
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
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Protease inhibitor SGPI-2
H, I
38N/AMutation(s): 4 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.228 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 71.327α = 90.00
b = 98.404β = 90.00
c = 155.531γ = 90.00
Software Package:
Software NamePurpose
DNAdata collection
SCALAdata scaling
PHASERphasing
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-04-25
    Type: Initial release
  • Version 1.1: 2012-05-09
    Type: Database references
  • Version 1.2: 2012-06-27
    Type: Database references