Document Detail

A new perspective on auxin perception.
MedLine Citation:
PMID:  20176409     Owner:  NLM     Status:  MEDLINE    
An important question in modern plant biology concerns the mechanisms of auxin perception. Despite the recently discovered soluble receptor, the F-box protein TIR1, there is no doubt that another type of signal perception exists, and is linked to the plasma membrane. Two models for the receptor have been suggested: either the receptor includes a protein kinase, or it is coupled with a G-protein. We propose a third model, acting through Ca(2+)-channels in the plasma membrane. The model is based on the revealed rapid auxin-induced reactions, including changes in the membrane potential, shifts in cytosol concentration of Ca(2+) and H(+) and modulation of cell sensitivity to hormones by the external Ca(2+) concentration. Detailed inhibitor analysis with both living cells and isolated plasma membranes show that auxin might directly stimulate Ca(2+) transport through the plasma membrane. A hypothetical scheme of auxin perception at the plasma membrane is suggested together with further transduction events. In addition, comparative analyses of auxin and serotonin perceptions are provided.
Maria Shishova; Sylvia Lindberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review     Date:  2010-02-21
Journal Detail:
Title:  Journal of plant physiology     Volume:  167     ISSN:  1618-1328     ISO Abbreviation:  J. Plant Physiol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-03-08     Completed Date:  2010-05-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882059     Medline TA:  J Plant Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  417-22     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier GmbH. All rights reserved.
Department of Plant Physiology and Biochemistry, St. Petersburg State University, 199034 St. Petersburg, Russia.
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MeSH Terms
Calcium / metabolism
Cell Membrane / drug effects,  metabolism
Gene Expression Regulation, Plant / drug effects*,  genetics
Indoleacetic Acids / pharmacology*
Models, Biological
Plant Proteins / genetics,  metabolism
Signal Transduction / drug effects*,  genetics
Reg. No./Substance:
0/Indoleacetic Acids; 0/Plant Proteins; 7440-70-2/Calcium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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