Contryphans from Conus textile venom ducts

Citation
Ec. Jimenez et al., Contryphans from Conus textile venom ducts, TOXICON, 39(6), 2001, pp. 803-808
Citations number
13
Categorie Soggetti
Pharmacology & Toxicology
Journal title
TOXICON
ISSN journal
00410101 → ACNP
Volume
39
Issue
6
Year of publication
2001
Pages
803 - 808
Database
ISI
SICI code
0041-0101(200106)39:6<803:CFCTVD>2.0.ZU;2-V
Abstract
Contryphans an unusual Conus peptides which contain a distinctive post-tran slational modification, D-tryptophan or D-leucine. cDNA clones encoding new contryphans from the mollusc-hunting cone snail Conus textile were identif ied and the inferred mature peptides were synthesized: contryphan-Tx (Glp-C ys-Hyp-D-Trp-Gln-Pro-Tyr-Cys-NH2), Leu-contryphan-Tx (Cys-Val-D-Leu-Tyr-Pro -Trp-Cys-NH2) and contryphan R/Tx which is identical to contryphan-R [Jimen ez et al., 1996. Contryphan is a D-tryptophan containing Conus peptide. J. Biol. Chem. 281, 78002-28005], Leu-contryphan-Tx exhibits a single peak, bu t contryphan-Tx shows two peaks under reverse-phase high-performance liquid chromatography conditions. Ultraviolet resonance Raman spectroscopy demons trates a difference in the D-tryptophan dihedral angle for the two contryph an-Tx equilibrium conformers. Both the sequences and in vivo effects of all contryphans isolated suggest that there are two major branches of the cont ryphan family. (C) 2001 Elsevier Science Ltd. All rights reserved.