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Free Content An Arabidopsis cell wall-associated kinase required for invertase activity and cell growth

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The wall-associated kinases (WAK), a family of five proteins that contain extracellular domains that can be linked to pectin molecules of the cell wall, span the plasma membrane and have a cytoplasmic serine/threonine kinase domain. Previous work has shown that a reduction in WAK protein levels leads to a loss of cell expansion, indicating that these receptor-like proteins have a role in cell shape formation. Here it is shown that a single wak2 mutation exhibits a dependence on sugars and salts for seedling growth. This mutation also reduces the expression and activity of vacuolar invertase, often a key factor in turgor and expansion. WAKs may thus provide a molecular mechanism linking cell wall sensing (via pectin attachment) to regulation of solute metabolism, which in turn is known to be involved in turgor maintenance in growing cells.
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Keywords: cell expansion; cell wall; plasma membrane; receptor kinase; sugar metabolism; vacuole

Document Type: Research Article

Affiliations: 1: Department of Biology, Bowdoin College, Brunswick, ME 04011, USA 2: Plant Molecular and Cell Biology Program – Horticultural Sciences , Room 1308 Fifield Hall, Hull Road, University of Florida, Gainesville, FL 32611, USA

Publication date: April 1, 2006

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