Plants create cell walls by depositing cellulose, hemicellulose and pectin in a regulated fashion. Cellulose, the main component of plant cell walls, is used to make products like paper, textiles, and biofuels, while hemicellulose and pectin have uses as food additives, pharmaceuticals, and more.
However, the process by which plants deposit cellulose and other components into cell walls is not well understood. In a new study, published in the journal Nature Plants, researchers at the University of Cambridge and the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, identified key proteins involved in the process.
The researchers used a combination of genetic analysis, microscopy, and biochemistry to study the deposition of cellulose and hemicellulose in the cell walls of Arabidopsis, a small flowering plant that is often used as a model organism in plant biology. They identified two proteins that are essential for the correct deposition of cellulose and hemicellulose, called CELLULOSE SYNTHASE-LIKE A3 (CSLA3) and CELLULOSE SYNTHASE-LIKE D4 (CSLD4).
The researchers found that CSLA3 and CSLD4 are located on the surface of the cell wall and that they interact with each other to form a complex that is essential for the deposition of cellulose and hemicellulose. They also found that the CSLA3-CSLD4 complex is regulated by a small molecule called calcium, which is known to be involved in a variety of cellular processes, including cell wall synthesis.
The discovery of the CSLA3-CSLD4 complex provides new insights into the process of cell wall synthesis in plants. This knowledge could lead to new ways to improve the production of biofuels and other plant-based products, as well as new medical treatments for diseases that affect the cell wall.
"Our findings provide a new understanding of the molecular mechanisms underlying cell wall synthesis in plants," said Dr. Hervé Höfte, a co-author of the study from the University of Cambridge. "This knowledge could have important implications for the development of new biofuels, plant-based materials, and medical treatments."
