Abstract: OsK1 is a 38-residue peptide with 3 disulphide bridges and is found in the venom of the scorpion Orthochirus scrobiculosus. It is potently active on voltage-gated K+ channels Kv1.1, Kv1.2 and Kv1.3, and moderately active on the type 1 intermediate-conductance Cat2+-activated channel KCa3.1. Derivatives of OsK1, particularly involving truncation or point mutations, have been developed to enhance the activity against and selectivity for the Kv1.3 channel. This renders the derivatives likely candidates for the treatment of autoimmune diseases, including multiple sclerosis. Such use may be alone or in combination therapy with maurotoxin, another scorpion toxin.

Abstract: The incorporation of multiple branch peptide constructions having activity against HIV into liposomes of sufficient size for white blood cell internalization (e.g. greater than 150 nm and preferably approximately 250-400 nm. ) has been shown to increase the activity of those MBPCs manifold. The liposomes and pharmaceutical compositions are described herein.