1SZB

Crystal structure of the human MBL-associated protein 19 (MAp19)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.261 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The X-ray structure of human MBL-associated protein 19 (MAp19) and its interaction site with mannan-binding lectin and L-ficolin

Gregory, L.A.Thielens, N.M.Matsushita, M.Sorensen, R.Arlaud, G.J.Fontecilla-Camps, J.C.Gaboriaud, C.

(2004) J.Biol.Chem. 279: 29391-29397

  • DOI: 10.1074/jbc.M402687200

  • PubMed Abstract: 
  • MAp19 is an alternative splicing product of the MASP-2 gene comprising the N-terminal CUB1-epidermal growth factor (EGF) segment of MASP-2, plus four additional residues at its C-terminal end. Like full-length MASP-2, it forms Ca(2+)-dependent comple ...

    MAp19 is an alternative splicing product of the MASP-2 gene comprising the N-terminal CUB1-epidermal growth factor (EGF) segment of MASP-2, plus four additional residues at its C-terminal end. Like full-length MASP-2, it forms Ca(2+)-dependent complexes with mannan-binding lectin (MBL) and L-ficolin. The x-ray structure of human MAp19 was solved to a resolution of 2.5 A. It shows a head to tail homodimer held together by interactions between the CUB1 module of one monomer and the EGF module of its counterpart. A Ca(2+) ion bound to each EGF module stabilizes the dimer interfaces. A second Ca(2+) ion is bound to the distal end of each CUB1 module, through six ligands contributed by Glu(52), Asp(60), Asp(105), Ser(107), Asn(108), and a water molecule. Compared with its counterpart in human C1s, the N-terminal end of the MAp19 CUB1 module contains a 7-residue extension that forms additional inter-monomer contacts. To identify the residues involved in the interaction of MAp19 with MBL and L-ficolin, point mutants were generated and their binding ability was determined using surface plasmon resonance spectroscopy. Six mutations at Tyr(59), Asp(60), Glu(83), Asp(105), Tyr(106), and Glu(109) either strongly decreased or abolished interaction with both MBL and L-ficolin. These mutations map a common binding site for these proteins located at the distal end of each CUB1 module and stabilized by the Ca(2+) ion.


    Organizational Affiliation

    Laboratoire de Cristallographie et Cristallogénèse des Protéines, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
mannose binding lectin-associated serine protease-2 related protein, MAp19 (19kDa)
A, B
170Homo sapiensMutation(s): 0 
Gene Names: MASP2
EC: 3.4.21.104
Find proteins for O00187 (Homo sapiens)
Go to Gene View: MASP2
Go to UniProtKB:  O00187
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.261 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 67.754α = 90.00
b = 67.754β = 90.00
c = 187.923γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-22
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance