ISDA

Deposition Date 2012-03-29

Release Date 2013-01-09

Last Version Date 2024-10-16

Entry Detail

PDB ID:

4AOR

Keywords:

HYDROLASE/INHIBITOR

Title:

Cationic trypsin in complex with the Spinacia oleracea trypsin inhibitor III (SOTI-III)

Biological Source:

Source Organism:

SPINACIA OLERACEA (Taxon ID: 3562)
BOS TAURUS (Taxon ID: 9913)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.70 Å

R-Value Free:

0.22

R-Value Work:

0.17

R-Value Observed:

0.18

Space Group:

P 1 21 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:CATIONIC TRYPSIN
Gene (Uniprot):PRSS1
Chain IDs:A, B, C
Chain Length:223
Number of Molecules:3
Biological Source:BOS TAURUS

UniProt ID:P00760 Pfam ID:PF00089 EC:3.4.21.4

Protein Blast

Polymer Type:polypeptide(L)
Molecule:TRYPSIN INHIBITOR 3
Chain IDs:D, E, F
Chain Length:37
Number of Molecules:3
Biological Source:SPINACIA OLERACEA

UniProt ID:P84781 Pfam ID:PF17983

Ligand Molecules

GOL

IMD

MES

Primary Citation

Structural Characterization of Spinacia Oleracea Trypsin Inhibitor III (Soti-III)

Glotzbach, B, Schmelz, S, Reinwarth, M, Christmann, A, Heinz, D.W, Kolmar, H.Show

Acta Crystallogr.,Sect.D 69 114 ? (2013)

PMID: 23275169 DOI: 10.1107/S0907444912043880

Abstact

In recent decades, several canonical serine protease inhibitor families have been classified and characterized. In contrast to most trypsin inhibitors, those from garden four o'clock (Mirabilis jalapa) and spinach (Spinacia oleracea) do not share sequence similarity and have been proposed to form the new Mirabilis serine protease inhibitor family. These 30-40-amino-acid inhibitors possess a defined disulfide-bridge topology and belong to the cystine-knot miniproteins (knottins). To date, no atomic structure of this inhibitor family has been solved. Here, the first structure of S. oleracea trypsin inhibitor III (SOTI-III), in complex with bovine pancreatic trypsin, is reported. The inhibitor was synthesized by solid-phase peptide synthesis on a multi-milligram scale and was assayed to test its inhibitory activity and binding properties. The structure confirmed the proposed cystine-bridge topology. The structural features of SOTI-III suggest that it belongs to a new canonical serine protease inhibitor family with promising properties for use in protein-engineering and medical applications.

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Primary Citation of related structures