7PX1 | pdb_00007px1

Conotoxin from Conus mucronatus

PDB DOI: https://doi.org/10.2210/pdb7PX1/pdb

Classification: TOXIN
Organism(s): Conus mucronatus
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2021-10-07 Released: 2022-11-02
Deposition Author(s): Mueller, E., Hackney, C.M., Ellgaard, L., Morth, J.P.
Funding Organization(s): Novo Nordisk Foundation

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.33 Å
R-Value Free:
0.308 (Depositor), 0.312 (DCC)
R-Value Work:
0.261 (Depositor), 0.267 (DCC)
R-Value Observed:
0.263 (Depositor)

wwPDB Validation 3D Report Full Report

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

Literature

A previously unrecognized superfamily of macro-conotoxins includes an inhibitor of the sensory neuron calcium channel Cav2.3.

Hackney, C.M., Florez Salcedo, P., Mueller, E., Koch, T.L., Kjelgaard, L.D., Watkins, M., Zachariassen, L., Tuelund, P.S., McArthur, J.R., Adams, D.J., Kristensen, A.S., Olivera, B., Finol-Urdaneta, R.K., Safavi-Hemami, H., Morth, J.P., Ellgaard, L.

(2023) PLoS Biol 21: e3002217-e3002217

PubMed: 37535677 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1371/journal.pbio.3002217
Primary Citation Related Structures:
7PX1, 7PX2

PubMed Abstract:
Animal venom peptides represent valuable compounds for biomedical exploration. The venoms of marine cone snails constitute a particularly rich source of peptide toxins, known as conotoxins. Here, we identify the sequence of an unusually large conotoxin, Mu8.1, which defines a new class of conotoxins evolutionarily related to the well-known con-ikot-ikots and 2 additional conotoxin classes not previously described. The crystal structure of recombinant Mu8.1 displays a saposin-like fold and shows structural similarity with con-ikot-ikot. Functional studies demonstrate that Mu8.1 curtails calcium influx in defined classes of murine somatosensory dorsal root ganglion (DRG) neurons. When tested on a variety of recombinantly expressed voltage-gated ion channels, Mu8.1 displayed the highest potency against the R-type (Cav2.3) calcium channel. Ca2+ signals from Mu8.1-sensitive DRG neurons were also inhibited by SNX-482, a known spider peptide modulator of Cav2.3 and voltage-gated K+ (Kv4) channels. Our findings highlight the potential of Mu8.1 as a molecular tool to identify and study neuronal subclasses expressing Cav2.3. Importantly, this multidisciplinary study showcases the potential of uncovering novel structures and bioactivities within the largely unexplored group of macro-conotoxins.

Organizational Affiliation

Department of Biology, Linderstrøm-Lang Centre for Protein Science, University of Copenhagen, Copenhagen, Denmark.

Macromolecule Content

Total Structure Weight: 21.98 kDa
Atom Count: 1,386
Modeled Residue Count: 168
Deposited Residue Count: 178
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Conus mucronatus	A, B	89	Conus mucronatus	Mutation(s): 0
UniProt
Find proteins for P0DRC4 (Conus mucronatus) Explore P0DRC4 Go to UniProtKB: P0DRC4
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0DRC4
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
IOD Query on IOD Download:Ideal Coordinates CCD File SDF format, chain M [auth B] SDF format, chain L [auth B] SDF format, chain K [auth B] SDF format, chain J [auth B] SDF format, chain I [auth B] SDF format, chain E [auth A] SDF format, chain D [auth A] SDF format, chain C [auth A] MOL2 format, chain M [auth B] MOL2 format, chain L [auth B] MOL2 format, chain K [auth B] MOL2 format, chain J [auth B] MOL2 format, chain I [auth B] MOL2 format, chain E [auth A] MOL2 format, chain D [auth A] MOL2 format, chain C [auth A] mmCIF format, chain M [auth B] mmCIF format, chain L [auth B] mmCIF format, chain K [auth B] mmCIF format, chain J [auth B] mmCIF format, chain I [auth B] mmCIF format, chain E [auth A] mmCIF format, chain D [auth A] mmCIF format, chain C [auth A]	C [auth A] D [auth A] E [auth A] I [auth B] J [auth B] C [auth A], D [auth A], E [auth A], I [auth B], J [auth B], K [auth B], L [auth B], M [auth B]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M		Interactions Focus chain C [auth A] Focus chain D [auth A] Focus chain E [auth A] Focus chain I [auth B] Focus chain J [auth B] Focus chain K [auth B] Focus chain L [auth B] Focus chain M [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth A] Focus chain E [auth A] Focus chain I [auth B] Focus chain J [auth B] Focus chain K [auth B] Focus chain L [auth B] Focus chain M [auth B]
CD Query on CD Download:Ideal Coordinates CCD File SDF format, chain O [auth B] SDF format, chain N [auth B] SDF format, chain H [auth A] SDF format, chain G [auth A] SDF format, chain F [auth A] MOL2 format, chain O [auth B] MOL2 format, chain N [auth B] MOL2 format, chain H [auth A] MOL2 format, chain G [auth A] MOL2 format, chain F [auth A] mmCIF format, chain O [auth B] mmCIF format, chain N [auth B] mmCIF format, chain H [auth A] mmCIF format, chain G [auth A] mmCIF format, chain F [auth A]	F [auth A], G [auth A], H [auth A], N [auth B], O [auth B]	CADMIUM ION Cd WLZRMCYVCSSEQC-UHFFFAOYSA-N		Interactions Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain N [auth B] Focus chain O [auth B] Interactions & Density Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain N [auth B] Focus chain O [auth B]