Name: α-Conotoxin ImI-ATTO Fluor-590
Brand: Alomone Labs
SKU: C-290-AR

Cat #: C-290-AR

Lyophilized Powder yes

Bioassay Tested

Origin Modified synthetic peptide.

MW: 1924 Da

Purity: >95% (HPLC)

Form Lyophilized powder.

Effective concentration 1 – 2 µM.

Sequence GCCSDPRCAWRC.

Modifications Disulfide bonds between Cys²-Cys⁸, Cys³-Cys¹². Cys¹² - C-terminal amidation.

Label ATTO-590. ATTO dyes are characterized by strong absorption (high extinction coefficient), high fluorescence quantum yield, and high photo-stability. ATTO-590 maximum absorption is 593 nm and maximum fluorescence is at 622 nm. The fluorescence is excited most efficiently in the 575-610 nm range. The extent of labeling is 1 molecule of dye per molecule α-Conotoxin ImI.

Activity α-Conotoxin ImI potently and specifically blocks mammalian neuronal nAChR (α3/β2 > α7 > α3/β4)¹.

References-Activity

McIntosh, J.M. et al. (1994) J. Biol. Chem. 269, 16733.

Accession number P50983.

Shipping and storage Shipped at room temperature. Product as supplied can be stored intact at room temperature for several weeks. For longer periods, it should be stored at -20°C.

Solubility Any aqueous buffer. Centrifuge all product preparations before use (10000 x g 5 min). Avoid exposure to light.

Storage of solutions Up to two weeks at 4°C or three months at -20°C. Avoid exposure to light.

Our bioassay

Alomone Labs α-Conotoxin ImI-ATTO Fluor-590 inhibits α3/β2 nAChRs expressed in Xenopus oocytes.
A. Representative time course of α3/β2 current inhibition by 1.5 µM α-Conotoxin ImI-ATTO Fluor-590 (#C-290-AR). Currents were elicited every 50 sec by transient applications of 20 µM ACh, while membrane potential was held at -80 mV, and inhibited by 1.5 µM labeled toxin (green). B. Superimposed traces of α3/β2 currents evoked by ACh (arrow) after application of control (black) and of 1.5 µM α-Conotoxin ImI-ATTO Fluor-590 (green). Taken from the recording in A.
Alomone Labs α-Conotoxin ImI-ATTO Fluor-590 stains rat cerebellum.
Rat cerebellum sections were incubated with 25 nM α-Conotoxin ImI-ATTO Fluor-590 (#C-290-AR). A. DAPI (blue) shows distribution outlines in the layers of the cerebellum (arrow). B. α-Conotoxin ImI-ATTO Fluor-590 stains (red) neuronal clusters (arrow) in the granule layer (G). There was weak nonspecific labeling of the molecular layer (MOL) and nearly no labeling in the white matter (WM) layer.
Alomone Labs α-Conotoxin ImI-ATTO Fluor-590 stains rat deep cerebellar nuclei.
Rat deep cerebellar nuclei sections were incubated with 25 nM α-Conotoxin ImI-ATTO Fluor-590 (#C-290-AR). A. DAPI shows distribution outlines in the layers of the cerebellum. B. α-Conotoxin ImI-ATTO Fluor-590 stains cerebellar nuclei neurons (arrows).

References - Scientific background

McIntosh, J.M. et al. (1994) J. Biol. Chem. 269, 16733.
Johnson, D.S. et al. (1995) Mol. Pharmacol. 48, 194.

Scientific background α-Conotoxin ImI is a 12 amino acid peptidyl toxin isolated from Conus Imperialis venom¹, which blocks mammalian neuronal nAChRs located on postsynaptic membranes. This toxin inhibits mammalian neuronal nAChRs (α3/β2 > α7 > α3/β4) in a voltage-independent manner and has no effect on nAChRs composed of α2/β2, α3/β2, α4/β2, α2/β4, α3/β4, or α4/β4 subunits^1,2.

Target α3/β2 nAChR

Peptide Content: 100%

Lyophilized Powder

Last update: 02/01/2022

α-Conotoxin ImI-ATTO Fluor-590 (#C-290-AR) is a highly pure, synthetic, and biologically active conjugated peptide toxin.

Order Summary

α-Conotoxin ImI-ATTO Fluor-590

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Scientific Background

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