Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 110410.10 
• Atom Count: 7776 
• Residue Count: 976 
• Unique protein chains: 1

1A0L

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

• DOI: 10.2210/pdb1A0L/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Homo sapiens


• Deposited: 1997-12-03 Released: 1999-03-23 
• Deposition Author(s): Pereira, P.J.B., Bergner, A., Macedo-Ribeiro, S., Huber, R., Matschiner, G., Fritz, H., Sommerhoff, C.P., Bode, W.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å
• R-Value Free: 0.276 
• R-Value Work: 0.197 

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

• PubMed: 9521329 
• DOI: 10.1038/32703


• 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. 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
BETA-TRYPTASE	A, B, C, D	244	Homo sapiens	Mutation(s): 0  Gene Names: TPSB2 (TPS2) EC: 3.4.21.59
Find proteins for P20231 (Homo sapiens) Go to Gene View: TPSB2 Go to UniProtKB:  P20231

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
APA	A, B, C, D	(2S)-3-(4-carbamimidoylphenyl)-2-hydroxypropanoic acid C10 H12 N2 O3 FAFAPKBWTCDDJC-QMMMGPOBSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å
• R-Value Free: 0.276 
• R-Value Work: 0.197 
• Space Group: P 4₁

Unit Cell:

Length (Å)	Angle (°)
a = 82.930	α = 90.00
b = 82.930	β = 90.00
c = 172.860	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
X-PLOR	phasing
X-PLOR	model building
SCALEPACK	data scaling
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-12-03 
• Released Date: 1999-03-23 
• Deposition Author(s): Pereira, P.J.B., Bergner, A., Macedo-Ribeiro, S., Huber, R., Matschiner, G., Fritz, H., Sommerhoff, C.P., Bode, W.

Revision History 

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