Abstract
The Saccharomyces cerevisiae protein kinase C homologue, PKC1, is involved in maintenance of cell integrity during polarized growth. We have used a mutant complementation approach to investigate related signal transduction pathways in higher plants. Here we report the isolation of a cDNA from Arabidopsis thaliana which partially suppresses the lytic defect of a Δ pkc1 yeast strain. The encoded protein, ANT, belongs to the AP2-related gene family and is essential for ovule development. Expression in yeast of a LexA-ANT fusion protein activates transcription of a reporter gene from promoters containing lexA operators. Our results support the idea that ANT acts as transcriptional activator in planta.
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