Slotoxin, alphaKTx1.11, a new scorpion peptide blocker of MaxiK channels that differentiates between alpha and alpha+beta (beta1 or beta4) complexes.

Abstract:

:A novel peptide from Centruroides noxius Hoffmann scorpion venom was isolated and sequenced. The 37 amino acid peptide belongs to the charybdotoxin sub-family (alphaKTx1) and was numbered member 11. alphaKTx1.11 has 75% sequence identity with iberiotoxin and 54% with charybdotoxin. alphaKTx1.11 revealed specificity for mammalian MaxiK channels (hSlo), thus, was named slotoxin. Slotoxin blocks the MaxiK pore-forming alpha subunit reversibly (K(d)=1.5 nM). Slotoxin association with alpha+beta (beta1 or beta4) channels was approximately 10 times slower than iberiotoxin and charybdotoxin, leading to a lack of effect on alpha+beta4 when tested at 100 nM for 5 min. Thus, slotoxin is a better tool to distinguish MaxiK alpha+beta complexes.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Garcia-Valdes J,Zamudio FZ,Toro L,Possani LD

doi

10.1016/s0014-5793(01)02791-0

keywords:

subject

Has Abstract

pub_date

2001-09-21 00:00:00

pages

369-73

issue

3

eissn

0014-5793

issn

1873-3468

pii

S0014579301027910

journal_volume

505

pub_type

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