SHOU4 Proteins Regulate Trafficking of Cellulose Synthase Complexes to the Plasma Membrane
- Univ. of North Carolina, Chapel Hill, NC (United States); University of North Carolina, Chapel Hill
- Pennsylvania State Univ., University Park, PA (United States)
- Heinrich-Heine Univ. Düsseldorf (Germany)
- Univ. of North Carolina, Chapel Hill, NC (United States)
- Michigan State Univ., East Lansing, MI (United States); Pennsylvania State Univ., University Park, PA (United States)
Cell walls play critical roles in plants, regulating tissue mechanics, defining the extent and orientation of cell expansion, and providing a physical barrier against pathogen attack. Cellulose microfibrils, which are synthesized by plasma membrane-localized cellulose synthase (CESA) complexes, are the primary load-bearing elements of plant cell walls. Cell walls are dynamic structures that are regulated in part by cell wall integrity (CWI)-monitoring systems that feed back to modulate wall properties and the synthesis of new wall components. Several receptor-like kinases have been implicated as sensors of CWI, including the FEI1/FEI2 receptor-like kinases. Here, we characterize two genes encoding novel plant-specific plasma membrane proteins (SHOU4 and SHOU4L) that were identified in a suppressor screen of the cellulose-deficient fei1 fei2 mutant. shou4 shou4l double mutants display phenotypes consistent with elevated levels of cellulose, and elevated levels of non-crystalline cellulose are present in this mutant. Disruption of SHOU4 and SHOU4L increases the abundance of CESA proteins at the plasma membrane as a result of enhanced exocytosis. In conclusion, the SHOU4/4L N-terminal cytosolic domains directly interact with CESAs. Our results suggest that the SHOU4 proteins regulate cellulose synthesis in plants by influencing the trafficking of CESA complexes to the cell surface.
- Research Organization:
- Univ. of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001090
- OSTI ID:
- 1634833
- Journal Information:
- Current Biology, Journal Name: Current Biology Journal Issue: 19 Vol. 28; ISSN 0960-9822
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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