PMID: 6109631Dec 1, 1980Paper

Natural-abundance 13C nuclear-magnetic-resonance study of toxin II from Anemonia sulcata

European Journal of Biochemistry
R S NortonL Beress

Abstract

Natural-abundance 13C NMR spectra (at 15.04 MHz) of the polypeptide toxin II from the sea anemone Anemonia sulcata have been analysed and compared with corresponding spectra reported recently for a closely related polypeptide anthopleurin A. The spectra contain many resolved one-carbon and two-carbon resonances from carbonyl, aromatic and methyl carbons, many of which have been assigned to individual carbons in the molecule on the basis of their chemical shifts, including their pH dependence, and by comparison with the 13C NMR spectrum of anthopleurin A. Analysis of the effects of pH on the spectrum yields estimates for the pKa values of a number of functional groups in the molecule, as follows: side-chain carboxylates of the two aspartic acid residues 2 and 3.1; COOH-terminal carboxylic acid, 3.5; imidazolium moieties of the two histidine residues, 6.7 and 7.6 NH2-terminal ammonium, 8. The similarity between the pKa values of these functional groups in toxin II and those of corresponding groups in anthopleurin A, together with the close agreement between chemical shifts of conserved carbons, indicates that many local interactions are nearly identical in the two molecules, and thus supports the thesis that their overall conform...Continue Reading

References

Sep 1, 1976·European Journal of Biochemistry·G WundererW Machleidt
Oct 12, 1976·Naunyn-Schmiedeberg's Archives of Pharmacology·C AlsenR W Sattler
Dec 29, 1976·Naunyn-Schmiedeberg's Archives of Pharmacology·U Ravens
Jan 1, 1978·Toxicon : Official Journal of the International Society on Toxinology·C AlsenI Tesseraux
Mar 1, 1979·Proceedings of the National Academy of Sciences of the United States of America·R J WittebortF R Gurd
Feb 14, 1979·Biochemical and Biophysical Research Communications·R E LondonR L Blakley
Nov 1, 1976·Proceedings of the National Academy of Sciences of the United States of America·G Romey Lazdunski
Nov 11, 1973·Biochimica Et Biophysica Acta·J H Bradbury, R S Norton

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Citations

Jan 1, 1991·Toxicon : Official Journal of the International Society on Toxinology·R S Norton
Jan 1, 1982·Archives of Biochemistry and Biophysics·R S NortonD G Bishop

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