Polar localization of a symbiosis-specific phosphate transporter is mediated by a transient reorientation of secretion.

Proceedings of the National Academy of Sciences of the United States of America
Nathan PumplinMaria J Harrison

Abstract

The arbuscular mycorrhizal (AM) symbiosis, formed by land plants and AM fungi, evolved an estimated 400 million years ago and has been maintained in angiosperms, gymnosperms, pteridophytes, and some bryophytes as a strategy for enhancing phosphate acquisition. During AM symbiosis, the AM fungus colonizes the root cortical cells where it forms branched hyphae called arbuscules that function in nutrient exchange with the plant. Each arbuscule is enveloped in a plant membrane, the periarbuscular membrane, that contains a unique set of proteins including phosphate transporters such as Medicago truncatula MtPT4 [Javot et al., (2007) Proc Natl Acad Sci USA 104:1720-1725], which are essential for symbiotic phosphate transport. The periarbuscular membrane is physically continuous with the plasma membrane of the cortical cell, but MtPT4 and other periarbuscular membrane-resident proteins are located only in the domain around the arbuscule branches. Establishing the distinct protein composition of the periarbuscular membrane is critical for AM symbiosis, but currently the mechanism by which this composition is achieved is unknown. Here we investigate the targeting of MtPT4 to the periarbuscular membrane. By expressing MtPT4 and other pla...Continue Reading

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Citations

Apr 11, 2013·Mycorrhiza·Leonardo CasieriDaniel Wipf
Mar 15, 2012·Plant Physiology·Matthew H MeckfesselRebecca Dickstein
Mar 5, 2013·Annual Review of Plant Biology·Michael Udvardi, Philip S Poole
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