Structure-Activity Relationships of Analogs of Thapsigargin Modified at O-11 and O-12
摘要:
A number of analogues of thapsigargin have been synthesized by alkylating or acylating O-11 and O-12 in the lactol obtained by reducing thapsigargicin. Introduction of alpha-disposed substituents decreased the Ca2+-ATPase inhibitory potency of the analogue, whereas the enzyme was more tolerant toward beta-disposed substituents, indicating that the alpha-face of the lactone ring is in close contact with the binding site when the inhibitor is bound to the enzyme.
Removal of each of the acyl groups of thapsigargin at O-3, O-8 and O-10 significant reduces the affinity of the inhibitors to the SERCA1a pump. Replacement of the acyl groups at O-3 and O-10 with flexible residues could be performed with only a minor decrease of the affinity, whereas introduction of voluminous stiff residues caused dramatic reduction of the affinity. The results can be rationalized on the basis of the interactions of thapsigargin with the SERCA1a pump as revealed from 3D X-ray structural models of thapsigargin bound to the SERCA1a. In conclusion the results confirm and elaborate the previously suggested pharmocophore model of thapsigargin. (C) 2010 Elsevier Ltd. All rights reserved.
作者:Andersen, Annette、Cornett, Claus、Lauridsen, Annette、Olsen, Carl E.、Christensen, Soeren Broegger
DOI:——
日期:——
Structure-Activity Relationships of Analogs of Thapsigargin Modified at O-11 and O-12
作者:Simon Feldbk Nielsen、Ole Thastrup、Rudi Pedersen、Carl Erik Olsen、Soren Brogger Christensen
DOI:10.1021/jm00002a009
日期:1995.1
A number of analogues of thapsigargin have been synthesized by alkylating or acylating O-11 and O-12 in the lactol obtained by reducing thapsigargicin. Introduction of alpha-disposed substituents decreased the Ca2+-ATPase inhibitory potency of the analogue, whereas the enzyme was more tolerant toward beta-disposed substituents, indicating that the alpha-face of the lactone ring is in close contact with the binding site when the inhibitor is bound to the enzyme.