ISDA

Entry Detail

PDB ID:

1PPE

Keywords:

Title:

THE REFINED 2.0 ANGSTROMS X-RAY CRYSTAL STRUCTURE OF THE COMPLEX FORMED BETWEEN BOVINE BETA-TRYPSIN AND CMTI-I, A TRYPSIN INHIBITOR FROM SQUASH SEEDS (CUCURBITA MAXIMA): TOPOLOGICAL SIMILARITY OF THE SQUASH SEED INHIBITORS WITH THE CARBOXYPEPTIDASE A INHIBITOR FROM POTATOES

Biological Source:

Source Organism:

Bos taurus

PDB Version:

Deposition Date:

1991-10-24

Release Date:

1994-01-31

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.00 Å

R-Value Work:

0.15

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:TRYPSIN
Chain IDs:A (auth: E)
Chain Length:223
Number of Molecules:1
Biological Source:Bos taurus

UniProt ID:P00760 Pfam ID:PF00089 EC:3.4.21.4

Primary Citation

The refined 2.0 A X-ray crystal structure of the complex formed between bovine beta-trypsin and CMTI-I, a trypsin inhibitor from squash seeds (Cucurbita maxima). Topological similarity of the squash seed inhibitors with the carboxypeptidase A inhibitor from potatoes

Bode, W, Greyling, H.J, Huber, R, Otlewski, J, Wilusz, T, Bode, W, Huber, R, Holak, T.A, Bode, W, Huber, R, Otlewski, J, Wilusz, T, Wieczorek, M, Otlewski, J, Cook, J, Parks, K, Leluk, J, Wilimowska-Pelc, A, Polanowski, A, Wilusz, T, Laskowski Junior, M, Wilusz, T, Wieczorek, M, Polanowski, A, Denton, A, Cook, J, Laskowski Junior, M, Bode, W, Schwager, P.Show

FEBS Lett. 242 285 292 (1989)

PMID: 2914611 DOI: 10.1016/0014-5793(89)80486-7

Abstact

The stoichiometric complex formed between bovine beta-trypsin and the Cucurbita maxima trypsin inhibitor I (CMTI-I) was crystallized and its X-ray crystal structure determined using Patterson search techniques. Its structure has been crystallographically refined to a final R value of 0.152 (6.0-2.0 A). CMTI-I is of ellipsoidal shape; it lacks helices or beta-sheets, but consists of turns and connecting short polypeptide stretches. The disulfide pairing is CYS-3I-20I, Cys-10I-22I and Cys-16I-28I. According to the polypeptide fold and disulfide connectivity its structure resembles that of the carboxypeptidase A inhibitor from potatoes. Thirteen of the 29 inhibitor residues are in direct contact with trypsin; most of them are in the primary binding segment Val-2I (P4)-Glu-9I (P4') which contains the reactive site bond Arg-5I-Ile-6I and is in a conformation observed also for other serine proteinase inhibitors.

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Primary Citation of related structures