Calendar Name: seminars
Scheduled for: Wednesday, October 21 2009, 14:00 - 15:30
Event text: David Bouchez
Institut Jean-Pierre Bourgin
INRA Centre de Versailles-Grignon
Versailles
FRANCE
Details: "A regulatory complex involved in division plane
determination at the plant cell's cortex"
ABSTRACT
In plant cells, the set up of the various microtubule
arrays that follow one another during the cell cycle
(cortical interphase array, preprophase band, spindle,
phragmoplast) is obviously intimately connected with the
cell cycle machinery. However, the activities and
signals that coordinate and regulate the transitions of
the microtubule cytoskeleton are mostly unknown.
Our recent results have revealed a large regulatory
complex (TTP) composed of at least 5 protein partners.
The recruitment of the TTP complex to the cytoskeleton,
and its activity at the G2/M transition are necessary
for division plane determination and PPB formation in
Arabidopsis and moss. This complex also plays a pivotal
role in the organization of the interphase array during
diffuse growth. Interestingly enough, most proteins
involved in the TTP complex have similarities with
proteins involved in the centrosome of animal cells,
providing the first evidence of an evolutionary link
between the animal centrosome and the cortical
cytoskeleton of acentrosomal plant cells.
