4U32

Human mesotrypsin complexed with HAI-2 Kunitz domain 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Sequence and Conformational Specificity in Substrate Recognition: SEVERAL HUMAN KUNITZ PROTEASE INHIBITOR DOMAINS ARE SPECIFIC SUBSTRATES OF MESOTRYPSIN.

Pendlebury, D.Wang, R.Henin, R.D.Hockla, A.Soares, A.S.Madden, B.J.Kazanov, M.D.Radisky, E.S.

(2014) J.Biol.Chem. 289: 32783-32797

  • DOI: 10.1074/jbc.M114.609560
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mesotrypsin is an isoform of trypsin that is uniquely resistant to polypeptide trypsin inhibitors and can cleave some inhibitors rapidly. Previous studies have shown that the amyloid precursor protein Kunitz protease inhibitor domain (APPI) is a spec ...

    Mesotrypsin is an isoform of trypsin that is uniquely resistant to polypeptide trypsin inhibitors and can cleave some inhibitors rapidly. Previous studies have shown that the amyloid precursor protein Kunitz protease inhibitor domain (APPI) is a specific substrate of mesotrypsin and that stabilization of the APPI cleavage site in a canonical conformation contributes to recognition by mesotrypsin. We hypothesized that other proteins possessing potential cleavage sites stabilized in a similar conformation might also be mesotrypsin substrates. Here we evaluated a series of candidate substrates, including human Kunitz protease inhibitor domains from amyloid precursor-like protein 2 (APLP2), bikunin, hepatocyte growth factor activator inhibitor type 2 (HAI2), tissue factor pathway inhibitor-1 (TFPI1), and tissue factor pathway inhibitor-2 (TFPI2), as well as E-selectin, an unrelated protein possessing a potential cleavage site displaying canonical conformation. We find that Kunitz domains within APLP2, bikunin, and HAI2 are cleaved by mesotrypsin with kinetic profiles of specific substrates. TFPI1 and TFPI2 Kunitz domains are cleaved less efficiently by mesotrypsin, and E-selectin is not cleaved at the anticipated site. Cocrystal structures of mesotrypsin with HAI2 and bikunin Kunitz domains reveal the mode of mesotrypsin interaction with its canonical substrates. Our data suggest that major determinants of mesotrypsin substrate specificity include sequence preferences at the P1 and P'2 positions along with conformational stabilization of the cleavage site in the canonical conformation. Mesotrypsin up-regulation has been implicated previously in cancer progression, and proteolytic clearance of Kunitz protease inhibitors offers potential mechanisms by which mesotrypsin may mediate pathological effects in cancer.


    Organizational Affiliation

    From the Department of Cancer Biology, Mayo Clinic Comprehensive Cancer Center, Jacksonville, Florida 32224.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Kunitz-type protease inhibitor 2
X
55Homo sapiensMutation(s): 0 
Gene Names: SPINT2 (HAI2, KOP)
Find proteins for O43291 (Homo sapiens)
Go to Gene View: SPINT2
Go to UniProtKB:  O43291
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Trypsin-3
A
224Homo sapiensMutation(s): 1 
Gene Names: PRSS3 (PRSS4, TRY3, TRY4)
EC: 3.4.21.4
Find proteins for P35030 (Homo sapiens)
Go to Gene View: PRSS3
Go to UniProtKB:  P35030
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
X
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 37.194α = 90.00
b = 70.190β = 90.00
c = 123.033γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2014-11-12
    Type: Database references
  • Version 1.2: 2014-12-10
    Type: Database references