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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The spasmodic peptide defines a new conotoxin superfamily.

We purified and characterized a peptide from the venom of Conus textile that makes normal mice assume the phenotype of a well-known mutant, the spasmodic mouse. This "spasmodic" peptide has 27 amino acids, including two gamma-carboxyglutamate ( Gla) residues. A cDNA clone encoding the precursor for the peptide was identified; a gamma-carboxylation recognition signal sequence (gamma-CRS) is present in the -1 --> -20 region of the peptide precursor. Both the gamma-CRS and the position of the Gla residues in the mature toxin are notably different from other Gla-containing conopeptides. The spasmodic peptide has a novel disulfide framework and distinct signal sequence which together define a new P-superfamily of conopeptides. A cDNA encoding another member of the P-superfamily was identified from a different species, Conus gloriamaris.[1]

References

  1. The spasmodic peptide defines a new conotoxin superfamily. Lirazan, M.B., Hooper, D., Corpuz, G.P., Ramilo, C.A., Bandyopadhyay, P., Cruz, L.J., Olivera, B.M. Biochemistry (2000) [Pubmed]
 
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