An Arabidopsis cell wall-associated kinase required for invertase activity and cell growth
Article first published online: 21 MAR 2006
The Plant Journal
Volume 46, Issue 2, pages 307–316, April 2006
How to Cite
Kohorn, B. D., Kobayashi, M., Johansen, S., Riese, J., Huang, L.-F., Koch, K., Fu, S., Dotson, A. and Byers, N. (2006), An Arabidopsis cell wall-associated kinase required for invertase activity and cell growth. The Plant Journal, 46: 307–316. doi: 10.1111/j.1365-313X.2006.02695.x
- Issue published online: 21 MAR 2006
- Article first published online: 21 MAR 2006
- Received 7 November 2005; accepted 23 December 2005.
- cell wall;
- cell expansion;
- receptor kinase;
- plasma membrane;
- sugar metabolism
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.