JXB Advance Access published online on September 29, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern240
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Post-transcriptional regulation of auxin transport proteins: cellular trafficking, protein phosphorylation, protein maturation, ubiquitination, and membrane composition
Department of Horticulture, Purdue University, West Lafayette, Indiana 47907-2010, USA
* To whom correspondence should be addressed: E-mail: murphy{at}purdue.edu
Auxin concentration gradients, established by polar transport of auxin, are essential for the establishment and maintenance of polar growth and morphological patterning. Three families of cellular transport proteins, PIN-formed (PIN), P-glycoprotein (ABCB/PGP), and AUXIN RESISTANT 1/LIKE AUX1 (AUX1/LAX), can independently and co-ordinately transport auxin in plants. Regulation of these proteins involves intricate and co-ordinated cellular processes, including protein–protein interactions, vesicular trafficking, protein phosphorylation, ubiquitination, and stabilization of the transporter complexes on the plasma membrane.
Key words: AUX/LAX, cellular trafficking, membrane composition, P-glycoprotein, phosphorylation, pin-formed, protein maturation, ubiquitination
Received 2 July 2008; Revised 28 August 2008 Accepted 1 September 2008
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