8PWT | pdb_00008pwt

Solution structure of the peptide U11-MYRTX-Tb1a from the venom of the ant Tetramorium bicarinatum

PDB DOI: https://doi.org/10.2210/pdb8PWT/pdb
BMRB: 34837

Classification: TOXIN
Organism(s): Tetramorium bicarinatum
Mutation(s): No

Deposited: 2023-07-21 Released: 2023-10-25
Deposition Author(s): Jouvensal, L., Paquet, F., Loth, K.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: SOLUTION NMR
Conformers Calculated: 500
Conformers Submitted: 15
Selection Criteria: structures with the lowest energy

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Discovery of an Insect Neuroactive Helix Ring Peptide from Ant Venom.

Barasse, V., Jouvensal, L., Boy, G., Billet, A., Ascoet, S., Lefranc, B., Leprince, J., Dejean, A., Lacotte, V., Rahioui, I., Sivignon, C., Gaget, K., Ribeiro Lopes, M., Calevro, F., Da Silva, P., Loth, K., Paquet, F., Treilhou, M., Bonnafe, E., Touchard, A.

(2023) Toxins (Basel) 15

PubMed: 37888631 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.3390/toxins15100600
Primary Citation Related Structures:
8PWT

PubMed Abstract:
Ants are among the most abundant terrestrial invertebrate predators on Earth. To overwhelm their prey, they employ several remarkable behavioral, physiological, and biochemical innovations, including an effective paralytic venom. Ant venoms are thus cocktails of toxins finely tuned to disrupt the physiological systems of insect prey. They have received little attention yet hold great promise for the discovery of novel insecticidal molecules. To identify insect-neurotoxins from ant venoms, we screened the paralytic activity on blowflies of nine synthetic peptides previously characterized in the venom of Tetramorium bicarinatum . We selected peptide U ₁₁, a 34-amino acid peptide, for further insecticidal, structural, and pharmacological experiments. Insecticidal assays revealed that U ₁₁ is one of the most paralytic peptides ever reported from ant venoms against blowflies and is also capable of paralyzing honeybees. An NMR spectroscopy of U ₁₁ uncovered a unique scaffold, featuring a compact triangular ring helix structure stabilized by a single disulfide bond. Pharmacological assays using Drosophila S2 cells demonstrated that U ₁₁ is not cytotoxic, but suggest that it may modulate potassium conductance, which structural data seem to corroborate and will be confirmed in a future extended pharmacological investigation. The results described in this paper demonstrate that ant venom is a promising reservoir for the discovery of neuroactive insecticidal peptides.

Organizational Affiliation

EA-7417, Institut National Universitaire Champollion, Place de Verdun, 81012 Albi, France.

Macromolecule Content

Total Structure Weight: 4.03 kDa
Atom Count: 281
Modeled Residue Count: 34
Deposited Residue Count: 34
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
U11-myrmicitoxin-Tb1a	A	34	Tetramorium bicarinatum	Mutation(s): 0
UniProt
Find proteins for A0A6M3Z554 (Tetramorium bicarinatum) Explore A0A6M3Z554 Go to UniProtKB: A0A6M3Z554
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	A0A6M3Z554
Sequence Annotations Expand
Reference Sequence