ISDA

Deposition Date 2016-10-10

Release Date 2017-04-19

Last Version Date 2024-10-23

Entry Detail

PDB ID:

5H1I

Keywords:

DE NOVO PROTEIN

Title:

NMR structure of TIBA, a chimera of SFTI

Biological Source:

Source Organism:

Helianthus annuus (Taxon ID: 4232)

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

100

Conformers Submitted:

Selection Criteria:

structures with the lowest energy

Download Validation Report

Macromolecular Entities

Polymer Type:polypeptide(L)
Molecule:Bradykinin-trypsin inhibitor secondary loop chimera
Chain IDs:A
Chain Length:18
Number of Molecules:1
Biological Source:Helianthus annuus

Ligand Molecules

Primary Citation

An Orally Active Bradykinin B1 Receptor Antagonist Engineered as a Bifunctional Chimera of Sunflower Trypsin Inhibitor.

Qiu, Y, Taichi, M, Wei, N, Yang, H, Luo, K.Q, Tam, J.P.Show

J. Med. Chem. 60 504 510 (2017)

PMID: 27977181 DOI: 10.1021/acs.jmedchem.6b01011

Abstact

An orally active and metabolically stable peptide TIBA was successfully engineered as a chimera by fusing an analgesic bradykinin receptor antagonist peptide and the trypsin inhibitory loop of sunflower trypsin inhibitor-1. As a fusion cyclic peptide, the metabolically labile analgesic peptide is protected from degradation by exopeptidases as well as the endopeptidases, and its serum half-life extended from <5 min to >6 h as a chimera. Moreover, the chimera TIBA was also found to be orally active in an animal pain model using a hot plate assay.

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Primary Citation of related structures