Crystal structure of the zymogen catalytic region of human MASP-2

Experimental Data Snapshot

  • Resolution: 2.18 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 

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This is version 1.4 of the entry. See complete history


A True Autoactivating Enzyme: Structural insight into mannose-binding lectin-associated serine protease-2 activations

Gal, P.Harmat, V.Kocsis, A.Bian, T.Barna, L.Ambrus, G.Vegh, B.Balczer, J.Sim, R.B.Naray-Szabo, G.Zavodszky, P.

(2005) J Biol Chem 280: 33435-33444

  • DOI: https://doi.org/10.1074/jbc.M506051200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Few reports have described in detail a true autoactivation process, where no extrinsic cleavage factors are required to initiate the autoactivation of a zymogen. Herein, we provide structural and mechanistic insight into the autoactivation of a multidomain serine protease: mannose-binding lectin-associated serine protease-2 (MASP-2), the first enzymatic component in the lectin pathway of complement activation. We characterized the proenzyme form of a MASP-2 catalytic fragment encompassing its C-terminal three domains and solved its crystal structure at 2.4 A resolution. Surprisingly, zymogen MASP-2 is capable of cleaving its natural substrate C4, with an efficiency about 10% that of active MASP-2. Comparison of the zymogen and active structures of MASP-2 reveals that, in addition to the activation domain, other loops of the serine protease domain undergo significant conformational changes. This additional flexibility could play a key role in the transition of zymogen MASP-2 into a proteolytically active form. Based on the three-dimensional structures of proenzyme and active MASP-2 catalytic fragments, we present model for the active zymogen MASP-2 complex and propose a mechanism for the autoactivation process.

  • Organizational Affiliation

    Institute of Enzymology, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 7, Budapest H-1518, Hungary.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mannan-binding lectin serine protease 2403Homo sapiensMutation(s): 1 
Gene Names: MASP2
EC: 3.4.21
UniProt & NIH Common Fund Data Resources
Find proteins for O00187 (Homo sapiens)
Explore O00187 
Go to UniProtKB:  O00187
PHAROS:  O00187
GTEx:  ENSG00000009724 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00187
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.18 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.207 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.665α = 90
b = 72.689β = 90
c = 110.989γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-07-26
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references
  • Version 1.4: 2023-08-23
    Changes: Data collection, Refinement description