A novel Kv1.1 potassium channel blocking toxin from the venom of Palamneus gravimanus (Indian black scorpion)
J. venom. anim. toxins incl. trop. dis
; 11(3)jul.-set. 2005.
Article
in En
|
LILACS-Express
| LILACS, VETINDEX
| ID: biblio-1484402
Responsible library:
BR68.1
ABSTRACT
A peptide toxin was isolated from the venom of Palamneus gravimanus, the Indian black scorpion, to block human Kv1.1 channels expressed in Xenopus laevis oocytes. A 4.5 kD peptide (toxin), as confirmed by SDS-PAGE, was purified to homogeneity by ion exchange chromatography using CM-Sephadex C-25 followed by Sephadex G-50 gel filtration. Palamneus gravimanus toxin (PGT) selectively blocks the human cloned voltage-gated potassium channel hKv1.1 in a two-electrode voltage-clamp (TEVC) technique. The results obtained indicate that the toxin blocks the hKv1.1 channel at a nanomolar concentration range (Ki value of 10 nM) of the peptide to the external side of the cell. The blockage seems to be voltage-dependent. Comparative structure of PGT (a 4.5 kD peptide) with BTK-2 suggests a close relationship; therefore this toxin can be employed to investigate the hKv1.1 channel structure.
Full text:
1
Collection:
01-internacional
Database:
LILACS
/
VETINDEX
Language:
En
Journal:
J. venom. anim. toxins incl. trop. dis
Journal subject:
TOXICOLOGIA
Year:
2005
Document type:
Article
Country of publication:
Brazil