Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 65.76 kDa 
• Atom Count: 4210 
• Modelled Residue Count: 514 
• Deposited Residue Count: 572 
• Unique protein chains: 1

1NT0

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

• DOI: 10.2210/pdb1NT0/pdb

• Classification: HYDROLASE, SUGAR BINDING PROTEIN
• Organism(s): Rattus norvegicus
• Expression System: Cricetulus griseus
• Mutation(s): Yes 


• Deposited: 2003-01-28 Released: 2003-05-20 
• Deposition Author(s): Feinberg, H., Uitdehaag, J.C.M., Davies, J.M., Wallis, R., Drickamer, K., Weis, W.I.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.283 
• R-Value Work: 0.248 

Literature

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

• PubMed: 12743029 
• DOI: 10.1093/emboj/cdg236
• Primary Citation of Related Structures:  
  1NT0


• 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.

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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.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
mannose-binding protein associated serine protease-2	A, B [auth G]	286	Rattus norvegicus	Mutation(s): 1  Gene Names: Masp2 EC: 3.4.21.104
UniProt
Find proteins for Q9JJS8 (Rattus norvegicus) Explore Q9JJS8  Go to UniProtKB:  Q9JJS8

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	C [auth A], F [auth G]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
EDO	E [auth A], H [auth G]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
CA	D [auth A], G	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
AHB	A, B [auth G]	L-PEPTIDE LINKING	C4 H8 N2 O4		ASN

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 70.411	α = 90
b = 103.901	β = 119.93
c = 70.484	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
SOLVE	phasing
CNS	refinement
CCP4	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-01-28 
• Released Date: 2003-05-20 
Deposition Author(s): Feinberg, H., Uitdehaag, J.C.M., Davies, J.M., Wallis, R., Drickamer, K., Weis, W.I.

Revision History  

• 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