1SZB

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.263 

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
  • Primary Citation of Related Structures:  
    1SZB

  • 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 complexes with mannan-binding lectin (MBL) and L-ficolin ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
mannose binding lectin-associated serine protease-2 related protein, MAp19 (19kDa)A, B170Homo sapiensMutation(s): 0 
Gene Names: MASP2
EC: 3.4.21.104
UniProt & NIH Common Fund Data Resources
Find proteins for O00187 (Homo sapiens)
Explore O00187 
Go to UniProtKB:  O00187
PHAROS:  O00187
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.263 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.754α = 90
b = 67.754β = 90
c = 187.923γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
AMoREphasing
CNSrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

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