"Division plane orientation in plant cells"

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Monday 16 September 2019, 11:00 - 12:30

 
ABSTRACT

Division plane positioning is important for growth and development in eukaryotes. TANGLED1 (TAN1) is a microtubule-binding protein that localizes to the division site and mitotic microtubules and plays a critical role in division plane orientation in plants. Here, we show that TAN1 is essential for proper division plane orientation. Using in vitro dynamic microtubule assays, we show that TAN1 directly binds microtubules, mediating microtubule zippering or end-on microtubule interactions, depending on their contact angle. Maize tan1 mutant cells improperly position the preprophase band (PPB), which predicts the future division site. However, cell-shape-based modeling indicates that PPB positioning defects are likely a consequence of abnormal cell shapes and not due to TAN1 absence. Spindle defects in the tan1 mutant suggest that TAN1-mediated microtubule zippering may contribute to metaphase spindle organization. In telophase, co-localization of growing microtubules ends from the phragmoplast with TAN1 at the division site suggests that TAN1 interacts with microtubule tips end-on. Together, our results suggest that TAN1 contributes to spindle and phragmoplast microtubule organization to ensure proper division plane orientation.

Location Jozef Schell Seminar Room
Contact Dr Carolyn Rasmussen
University of California
Riverside
USA