The three yeast A kinases have specific signaling functions in pseudohyphal growth.
basic_science · Level V
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- Record sourced from PubMed, PMID 9811878.
- Also identified by PMC identifier 24897.
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Abstract
The three yeast A kinase catalytic subunit isoforms are redundant for viability. We demonstrate that they have dramatically different roles in pseudohyphal development: Tpk2 is essential, whereas Tpk3 inhibits. Tpk1 has no discernible effect. Two-hybrid analysis identified the transcription factor Sfl1 as a protein that interacts specifically with Tpk2, but not Tpk1 or Tpk3. Deletion of SFL1 enhances pseudohyphal and invasive growth. Flo11, a cell surface flocculin required for pseudohyphal development, is transcriptionally regulated by Tpk2 and Sfl1. Genetic evidence indicates that Tpk2 acts upstream of Sfl1 in the regulation of Flo11.
Medical subject headings
- Cyclic AMP-Dependent Protein Kinases
- Saccharomyces cerevisiae
- Signal Transduction