Direct observation of a target cell of the leaf-closing factor by using novel fluorescence-labeled phyllanthurinolactone
摘要:
We report the synthesis of the fluorescence-labeled probe 2 based on phyllanthurinolactone 1, which is a leaf-closing substance of Phyllanthus urinaria L. Bioorganic studies using probe 2 showed leaf-closing activity at 1 X 10(-5) M, which was one-hundredth of that of the natural product 1. The fluorescence study using 2 revealed that the target cell for I is a motor cell and suggested that some receptors for 1 exist on the plasma membrane of the motor cell as with leaf-opening substances. (c) 2005 Elsevier Ltd. All rights reserved.
Direct observation of a target cell of the leaf-closing factor by using novel fluorescence-labeled phyllanthurinolactone
摘要:
We report the synthesis of the fluorescence-labeled probe 2 based on phyllanthurinolactone 1, which is a leaf-closing substance of Phyllanthus urinaria L. Bioorganic studies using probe 2 showed leaf-closing activity at 1 X 10(-5) M, which was one-hundredth of that of the natural product 1. The fluorescence study using 2 revealed that the target cell for I is a motor cell and suggested that some receptors for 1 exist on the plasma membrane of the motor cell as with leaf-opening substances. (c) 2005 Elsevier Ltd. All rights reserved.
We report the synthesis of fluorescence-labeled probes based on phyllanthurinolactone 1, which is a leaf-closing substance of Phyllanthus urinaria L. The fluorescence study using biologically active probe 2 and inactive probes (epi-2 and 31) revealed that the target cell for 1 is a motor cell and suggested that some receptors, which recognize the aglycon of I exist on the plasma membrane of the motor cell, as with leaf-opening substances. Moreover, binding of probe 2 was specific to the plant motor cell contained in the plants belonging to the genus Phyllanthus. These results showed that the binding of probe 2 with a motor cell is specific to the plant genus and suggested that the genus-specific receptor for the leaf-closing substance would be involved in nyctinasty. (c) 2006 Elsevier Ltd. All rights reserved.