Record Details

Sodium channel modulating activity in a δ-conotoxin from an Indian marine snail
IR @ Indian Academy of Sciences
Title
Sodium channel modulating activity in a δ-conotoxin from an Indian marine snail
Creator
Sudarslal, S. Majumdar, Sriparna Ramasamy, P. Dhawan, Ritu Pal, Prajna P. Ramaswami, Mani Lala, Anil K. Sikdar, S. K. Sarma, Siddhartha P. Krishnan, K. S. Balaram, P.
Description
A 26 residue peptide (Am 2766) with the sequence CKQAGESCDIFSQNCCVG-TCAFICIE-NH2 has been isolated and purified from the venom of the molluscivorous snail, Conus amadis, collected off the southeastern coast of India. Chemical modification and mass spectrometric studies establish that Am 2766 has three disulfide bridges. C-terminal amidation has been demonstrated by mass measurements on the C-terminal fragments obtained by proteolysis. Sequence alignments establish that Am 2766 belongs to the δ-conotoxin family. Am 2766 inhibits the decay of the sodium current in brain rNav1.2a voltage-gated Na+ channel, stably expressed in Chinese hamster ovary cells. Unlike δ-conotoxins have previously been isolated from molluscivorous snails, Am 2766 inhibits inactivation of mammalian sodium channels.
Publisher
Federation of European Biochemical Societies
Date
2003-10-09
Type
Article PeerReviewed
Language
en