1A0L

HUMAN BETA-TRYPTASE: A RING-LIKE TETRAMER WITH ACTIVE SITES FACING A CENTRAL PORE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Human beta-tryptase is a ring-like tetramer with active sites facing a central pore.

Pereira, P.J., Bergner, A., Macedo-Ribeiro, S., Huber, R., Matschiner, G., Fritz, H., Sommerhoff, C.P., Bode, W.

(1998) Nature 392: 306-311

  • DOI: 10.1038/32703
  • Primary Citation of Related Structures:  
    1A0L

  • PubMed Abstract: 

    • Human tryptase, a mast-cell-specific serine proteinase that may be involved in causing asthma and other allergic and inflammatory disorders, is unique in two respects: it is enzymatically active only as a heparin-stabilized tetramer, and it is resistant to all known endogenous proteinase inhibitors ...

    Human tryptase, a mast-cell-specific serine proteinase that may be involved in causing asthma and other allergic and inflammatory disorders, is unique in two respects: it is enzymatically active only as a heparin-stabilized tetramer, and it is resistant to all known endogenous proteinase inhibitors. The 3-A crystal structure of human beta-tryptase in a complex with 4-amidinophenyl pyruvic acid shows four quasi-equivalent monomers arranged in a square flat ring of pseudo 222 symmetry. Each monomer contacts its neighbours at two different interfaces through six loop segments. These loops are located around the active site of beta-tryptase and differ considerably in length and conformation from loops of other trypsin-like proteinases. The four active centres of the tetramer are directed towards an oval central pore, restricting access for macromolecular substrates and enzyme inhibitors. Heparin chains might stabilize the complex by binding to an elongated patch of positively charged residues spanning two adjacent monomers. The nature of this unique tetrameric architecture explains many of tryptase's biochemical properties and provides a basis for the rational design of monofunctional and bifunctional tryptase inhibitors.

    Organizational Affiliation: 

    Abteilung für Strukturforschung, Max-Planck-Institut für Biochemie, Martinsried, Germany.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-TRYPTASEA, B, C, D244Homo sapiensMutation(s): 0 
Gene Names: TPSB2, TPS2
EC: 3.4.21.59
UniProt & NIH Common Fund Data Resources
Find proteins for P20231 (Homo sapiens)
Explore P20231 
Go to UniProtKB:  P20231
PHAROS:  P20231
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20231
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
APA
Query on APA
Download Ideal Coordinates CCD File 
E [auth A],
F [auth B],
G [auth C],
H [auth D]		(2S)-3-(4-carbamimidoylphenyl)-2-hydroxypropanoic acid
C10 H12 N2 O3
FAFAPKBWTCDDJC-QMMMGPOBSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.93α = 90
b = 82.93β = 90
c = 172.86γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-03-23
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance