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 
  • R-Value Observed: 0.182 

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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:  
    4U30, 4U32

  • 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 specific substrate of mesotrypsin and that stabilization of the APPI cleavage site in a canonical conformation contributes to recognition by mesotrypsin ...

    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, radisky.evette@mayo.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Kunitz-type protease inhibitor 2A [auth X]55Homo sapiensMutation(s): 0 
Gene Names: SPINT2, HAI2, KOP
UniProt & NIH Common Fund Data Resources
Find proteins for O43291 (Homo sapiens)
Explore O43291 
Go to UniProtKB:  O43291
PHAROS:  O43291
GTEx:  ENSG00000167642 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43291
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Trypsin-3B [auth A]224Homo sapiensMutation(s): 2 
Gene Names: PRSS3, PRSS4, TRY3, TRY4
EC: 3.4.21.4
UniProt & NIH Common Fund Data Resources
Find proteins for P35030 (Homo sapiens)
Explore P35030 
Go to UniProtKB:  P35030
PHAROS:  P35030
GTEx:  ENSG00000010438 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP35030
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
C [auth X]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
D [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-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 
  • R-Value Observed: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.194α = 90
b = 70.19β = 90
c = 123.033γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2014-11-12
    Changes: Database references
  • Version 1.2: 2014-12-10
    Changes: Database references
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary