1LDT

COMPLEX OF LEECH-DERIVED TRYPTASE INHIBITOR WITH PORCINE TRYPSIN

DOI: 10.2210/pdb1LDT/pdb

Classification: COMPLEX (HYDROLASE/INHIBITOR)
Organism(s): Sus scrofa, Hirudo medicinalis
Expression System: Saccharomyces cerevisiae
Mutation(s): No

Deposited: 1997-05-15 Released: 1998-05-20
Deposition Author(s): Stubbs, M.T.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.90 Å
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

The three-dimensional structure of recombinant leech-derived tryptase inhibitor in complex with trypsin. Implications for the structure of human mast cell tryptase and its inhibition.

Stubbs, M.T., Morenweiser, R., Sturzebecher, J., Bauer, M., Bode, W., Huber, R., Piechottka, G.P., Matschiner, G., Sommerhoff, C.P., Fritz, H., Auerswald, E.A.

(1997) J Biol Chem 272: 19931-19937

PubMed: 9242660 Search on PubMed
DOI: 10.1074/jbc.272.32.19931
Primary Citation of Related Structures:
1LDT

PubMed Abstract:

The x-ray crystal structure of recombinant leech-derived tryptase inhibitor (rLDTI) has been solved to a resolution of 1.9 A in complex with porcine trypsin. The nonclassical Kazal-type inhibitor exhibits the same overall architecture as that observed in solution and in rhodniin. The complex reveals structural aspects of the mast cell proteinase tryptase. The conformation of the binding region of rLDTI suggests that tryptase has a restricted active site cleft. The basic amino terminus of rLDTI, apparently flexible from previous NMR measurements, approaches the 148-loop of trypsin. This loop has an acidic equivalent in tryptase, suggesting that the basic amino terminus could make favorable electrostatic interactions with the tryptase molecule. A series of rLDTI variants constructed to probe this hypothesis confirmed that the amino-terminal Lys-Lys sequence plays a role in inhibition of human lung tryptase but not of trypsin or chymotrypsin. The location of such an acidic surface patch is in accordance with the known low molecular weight inhibitors of tryptase.

Related Citations:

Structure of Leech Derived Tryptase Inhibitor (Ldti-C) in Solution
Muhlhahn, P., Czisch, M., Morenweiser, R., Habermann, B., Engh, R.A., Sommerhoff, C.P., Auerswald, E.A., Holak, T.A.
(1994) FEBS Lett 355: 290

Recombinant Leech-Derived Tryptase Inhibitor: Construction, Production, Protein Chemical Characterization and Inhibition of HIV-1 Replication
Auerswald, E.A., Morenweiser, R., Sommerhoff, C.P., Piechottka, G.P., Eckerskorn, C., Gurtler, L.G., Fritz, H.
(1994) Biol Chem Hoppe Seyler 375: 695

A Kazal-Type Inhibitor of Human Mast Cell Tryptase: Isolation from the Medical Leech Hirudo Medicinalis, Characterization, and Sequence Analysis
Sommerhoff, C.P., Sollner, C., Mentele, R., Piechottka, G.P., Auerswald, E.A., Fritz, H.
(1994) Biol Chem Hoppe Seyler 375: 685

Organizational Affiliation:

Max-Planck-Institut für Biochemie, Am Klopferspitz, D-82152 Martinsried bei München, Germany.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TRYPSIN	A [auth T]	223	Sus scrofa	Mutation(s): 0 EC: 3.4.21.4
UniProt
Find proteins for P00761 (Sus scrofa) Explore P00761 Go to UniProtKB: P00761
Protein Feature View Expand
Reference Sequence

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
TRYPTASE INHIBITOR	B [auth L]	46	Hirudo medicinalis	Mutation(s): 0
UniProt
Find proteins for P80424 (Hirudo medicinalis) Explore P80424 Go to UniProtKB: P80424
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
CA Query on CA Download Ideal Coordinates CCD File SDF format, chain C [auth T] MOL2 format, chain C [auth T]	C [auth T]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N		Ligand Interaction