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Unearthing key function of plant hormone
Date:2/28/2014

ses, which regulate the organization of the cell's inner skeleton. This cytoskeleton is disrupted when TMKs are mutated, as filamentous actin does not localize correctly and cortical microtubules are disorganized. The researchers show that all of TMK1 as well as around a quarter of ABP1 can be found at the plasma membrane. In the presence of auxin, TMK1 and ABP1 bind to each other. The researchers propose that secreted ABP1 binds to TMK1 at the plasma membrane in response to extracellular auxin, and signal to ROP GTPases which affect the cytoskeleton.

TMK1 is at least one of the long-sought docking proteins of ABP1, which couple extracellular auxin and its perception by ABP1 to downstream cytoplasmic events. Solving the mystery of cell surface-cytoplasmic auxin perception, this research opens up a new horizon in auxin biology.


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Contact: Oliver Lehmann
oliver.lehmann@ist.ac.at
43-067-640-12562
Institute of Science and Technology Austria
Source:Eurekalert  

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