Fig. 5. S. pombe mbx1+. (A) Schematic representation of the predicted 436 amino acid S. pombe Mbx1p, MADS box-like protein (SPBC19G7.06). Position of the MADS box motif (M; 20-80) is shown. Phylogenetic tree showing the relationship between S. cerevisiae and S. pombe MADS box-like polypeptides, based on multiple sequence alignment, generated using the DNA cluster method in the Megalign programme based on a Jotun Hein algorithm (DNASTAR). (B) Fluorescent micrographs of mbx1
(JM 2331) cells, growing exponentially in EMM at 28°C. DNA stained with DAPI and septa marked with calcofluor. Representative images illustrating cytokinetic defects are shown. Bar, 10 µm. (C) Genetic interaction between mbx1+ and fkh2+. fkh2
sep1
(GG 631), fkh2
mbx1
(GG 551), sep1
mbx1
(GG 543) and sep1
fkh2
mbx1
(GG 754) cells were streaked on YE agar and grown at 28°C for 3 days. (D) sep1
, fkh2
and mbx1
show synthetic cytokinetic defects. Micrographs of cells growing in liquid EMM at 28°C: wild-type (GG 1), fkh2
(JM 2286), mbx1
(JM 2331), sep1
(GG 515), fkh2
mbx1
(GG 551), fkh2
sep1
(GG 631), sep1
mbx1
(GG 543) and fkh2
mbx1
sep1
(GG 754) were shown. Bar, 10 µm.