1EAX

Crystal structure of MTSP1 (matriptase)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Catalytic Domain Structures of Mt-Sp1/Matriptase, a Matrix-Degrading Transmembrane Serine Proteinase.

Friedrich, R.Fuentes-Prior, P.Ong, E.Coombs, G.Hunter, M.Oehler, R.Pierson, D.Gonzalez, R.Huber, R.Bode, W.Madison, E.L.

(2002) J.Biol.Chem. 277: 2160

  • DOI: 10.1074/jbc.M109830200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The type II transmembrane multidomain serine proteinase MT-SP1/matriptase is highly expressed in many human cancer-derived cell lines and has been implicated in extracellular matrix re-modeling, tumor growth, and metastasis. We have expressed the cat ...

    The type II transmembrane multidomain serine proteinase MT-SP1/matriptase is highly expressed in many human cancer-derived cell lines and has been implicated in extracellular matrix re-modeling, tumor growth, and metastasis. We have expressed the catalytic domain of MT-SP1 and solved the crystal structures of complexes with benzamidine at 1.3 A and bovine pancreatic trypsin inhibitor at 2.9 A. MT-SP1 exhibits a trypsin-like serine proteinase fold, featuring a unique nine-residue 60-insertion loop that influences interactions with protein substrates. The structure discloses a trypsin-like S1 pocket, a small hydrophobic S2 subsite, and an open negatively charged S4 cavity that favors the binding of basic P3/P4 residues. A complementary charge pattern on the surface opposite the active site cleft suggests a distinct docking of the preceding low density lipoprotein receptor class A domain. The benzamidine crystals possess a freely accessible active site and are hence well suited for soaking small molecules, facilitating the improvement of inhibitors. The crystal structure of the MT-SP1 complex with bovine pancreatic trypsin inhibitor serves as a model for hepatocyte growth factor activator inhibitor 1, the physiological inhibitor of MT-SP1, and suggests determinants for the substrate specificity.


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Am Klopferspitz 18a, 82152 Martinsried, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUPPRESSOR OF TUMORIGENICITY 14
A
241Homo sapiensGene Names: ST14 (PRSS14, SNC19, TADG15)
EC: 3.4.21.109
Find proteins for Q9Y5Y6 (Homo sapiens)
Go to Gene View: ST14
Go to UniProtKB:  Q9Y5Y6
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
BEN
Query on BEN

Download SDF File 
Download CCD File 
A
BENZAMIDINE
C7 H8 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BDNKi: 400000 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.184 
  • Space Group: C 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 66.918α = 90.00
b = 141.604β = 90.00
c = 51.936γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
AMoREphasing
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-01-28
    Type: Initial release
  • Version 1.1: 2015-04-15
    Type: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Version format compliance