ISDA: 2CMY

Deposition Date 2006-05-16

Release Date 2007-05-22

Last Version Date 2024-10-23

Entry Detail

PDB ID:

2CMY

Keywords:

HYDROLASE

Title:

Crystal complex between bovine trypsin and Veronica hederifolia trypsin inhibitor

Biological Source:

Source Organism:

BOS TAURUS (Taxon ID: 9913)
VERONICA HEDERIFOLIA (Taxon ID: 202477)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.25 Å

R-Value Free:

0.25

R-Value Work:

0.19

R-Value Observed:

0.19

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:CATIONIC TRYPSIN
Gene (Uniprot):PRSS1
Chain IDs:A
Chain Length:223
Number of Molecules:1
Biological Source:BOS TAURUS

UniProt ID:P00760 Pfam ID:PF00089 EC:3.4.21.4

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:VERONICA HEDERIFOLIA TRYPSIN INHIBITOR
Chain IDs:B
Chain Length:34
Number of Molecules:1
Biological Source:VERONICA HEDERIFOLIA

UniProt ID:P85981

Ligand Molecules

GOL

SO4

Primary Citation

An Unusual Helix-Turn-Helix Protease Inhibitory Motif in a Novel Trypsin Inhibitor from Seeds of Veronica (Veronica Hederifolia L.).

Conners, R, Konarev, A, Forsyth, J, Lovegrove, A, Marsh, J, Joseph-Horne, T, Shewry, P, Brady, R.L.Show

J.Biol.Chem. 282 27760 ? (2007)

PMID: 17640870 DOI: 10.1074/JBC.M703871200

Abstact

The storage tissues of many plants contain protease inhibitors that are believed to play an important role in defending the plant from invasion by pests and pathogens. These proteinaceous inhibitor molecules belong to a number of structurally distinct families. We describe here the isolation, purification, initial inhibitory properties, and three-dimensional structure of a novel trypsin inhibitor from seeds of Veronica hederifolia (VhTI). The VhTI peptide inhibits trypsin with a submicromolar apparent K(i) and is expected to be specific for trypsin-like serine proteases. VhTI differs dramatically in structure from all previously described families of trypsin inhibitors, consisting of a helix-turn-helix motif, with the two alpha helices tightly associated by two disulfide bonds. Unusually, the crystallized complex is in the form of a stabilized acyl-enzyme intermediate with the scissile bond of the VhTI inhibitor cleaved and the resulting N-terminal portion of the inhibitor remaining attached to the trypsin catalytic serine 195 by an ester bond. A synthetic, truncated version of the VhTI peptide has also been produced and co-crystallized with trypsin but, surprisingly, is seen to be uncleaved and consequently forms a noncovalent complex with trypsin. The VhTI peptide shows that effective enzyme inhibitors can be constructed from simple helical motifs and provides a new scaffold on which to base the design of novel serine protease inhibitors.

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Primary Citation of related structures