Turbotoxins A and B, Novel Diiodotyramine Derivatives from the Japanese Gastropod Turbo marmorata
摘要:
Bioassay-guided separation of the aqueous ethanol extract of the viscera of the Japanese gastropod Turbo marmorata resulted in the isolation of two toxins, turbotoxins A and B. Their structures were determined by spectral analysis and confirmed by organic synthesis to be diiodotyramine derivatives. Turbotoxins A and B exhibited acute toxicity against ddY mice, with LD99 values of 1.0 and 4.0 mg/kg, respectively. The structure-toxicity relationships of turbotoxins were examined, and it was proved that the iodine atoms and trimethyl ammonium groups are important for its acute toxicity. Turbotoxin A inhibits acetylcholinesterase with an IC50 of 28 muM. (C) 2000 Elsevier Science Ltd. All rights reserved.
Turbotoxins A and B, Novel Diiodotyramine Derivatives from the Japanese Gastropod Turbo marmorata
摘要:
Bioassay-guided separation of the aqueous ethanol extract of the viscera of the Japanese gastropod Turbo marmorata resulted in the isolation of two toxins, turbotoxins A and B. Their structures were determined by spectral analysis and confirmed by organic synthesis to be diiodotyramine derivatives. Turbotoxins A and B exhibited acute toxicity against ddY mice, with LD99 values of 1.0 and 4.0 mg/kg, respectively. The structure-toxicity relationships of turbotoxins were examined, and it was proved that the iodine atoms and trimethyl ammonium groups are important for its acute toxicity. Turbotoxin A inhibits acetylcholinesterase with an IC50 of 28 muM. (C) 2000 Elsevier Science Ltd. All rights reserved.
Aplysamine-1 and related analogs as histamine H3 receptor antagonists
作者:Devin M. Swanson、Sandy J. Wilson、Jamin D. Boggs、Wei Xiao、Richard Apodaca、Ann J. Barbier、Timothy W. Lovenberg、Nicholas I. Carruthers
DOI:10.1016/j.bmcl.2005.11.003
日期:2006.2
Aplysamine-1 (1), a marine natural product, was synthesized and screened for in vitro activity at the human and rat histamine H-3 receptors. Aplysamine-1 (1) was found to possess a high binding affinity for the human H3 receptor (K-i = 30 +/- 4nM). Synthetic analogs of 1, including des-bromoaplysamine-1 (10) and dimethyl-2-[4-(3-piperidin-1-yl-propoxy)-phenyl]-ethyl}-amine (13), were potent H-3 antagonists. (c) 2005 Elsevier Ltd. All rights reserved.
Turbotoxins A and B, Novel Diiodotyramine Derivatives from the Japanese Gastropod Turbo marmorata
Bioassay-guided separation of the aqueous ethanol extract of the viscera of the Japanese gastropod Turbo marmorata resulted in the isolation of two toxins, turbotoxins A and B. Their structures were determined by spectral analysis and confirmed by organic synthesis to be diiodotyramine derivatives. Turbotoxins A and B exhibited acute toxicity against ddY mice, with LD99 values of 1.0 and 4.0 mg/kg, respectively. The structure-toxicity relationships of turbotoxins were examined, and it was proved that the iodine atoms and trimethyl ammonium groups are important for its acute toxicity. Turbotoxin A inhibits acetylcholinesterase with an IC50 of 28 muM. (C) 2000 Elsevier Science Ltd. All rights reserved.