Crystal structure of the CUB1-EGF-CUB2 region of MASP2

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.248 

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Crystal structure of the CUB1-EGF-CUB2 region of mannose-binding protein associated serine protease-2

Feinberg, H.Uitdehaag, J.C.M.Davies, J.M.Wallis, R.Drickamer, K.Weis, W.I.

(2003) EMBO J 22: 2348-2359

  • DOI: https://doi.org/10.1093/emboj/cdg236
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Serum mannose-binding proteins (MBPs) are C-type lectins that recognize cell surface carbohydrate structures on pathogens, and trigger killing of these targets by activating the complement pathway. MBPs circulate as a complex with MBP-associated serine proteases (MASPs), which become activated upon engagement of a target cell surface. The minimal functional unit for complement activation is a MASP homodimer bound to two MBP trimeric subunits. MASPs have a modular structure consisting of an N-terminal CUB domain, a Ca(2+)-binding EGF-like domain, a second CUB domain, two complement control protein modules and a C-terminal serine protease domain. The CUB1-EGF-CUB2 region mediates homodimerization and binding to MBP. The crystal structure of the MASP-2 CUB1-EGF-CUB2 dimer reveals an elongated structure with a prominent concave surface that is proposed to be the MBP-binding site. A model of the full six-domain structure and its interaction with MBPs suggests mechanisms by which binding to a target cell transmits conformational changes from MBP to MASP that allow activation of its protease activity.

  • Organizational Affiliation

    Departments of Structural Biology and of Molecular and Cellular Physiology, Stanford University School of Medicine, 299 Campus Drive West, CA 94305-5126, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
mannose-binding protein associated serine protease-2A,
B [auth G]
286Rattus norvegicusMutation(s): 1 
Find proteins for Q9JJS8 (Rattus norvegicus)
Explore Q9JJS8 
Go to UniProtKB:  Q9JJS8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9JJS8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.248 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.411α = 90
b = 103.901β = 119.93
c = 70.484γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-05-20
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Database references, Derived calculations, Structure summary