1. Evidence that the RdeA protein is a component of a multistep phosphorelay modulating rate of development in Dictyostelium.
- Author
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Chang WT, Thomason PA, Gross JD, and Neweil PC
- Subjects
- Adenylyl Cyclases genetics, Amino Acid Sequence, Animals, Base Sequence, DNA, Complementary, DNA-Binding Proteins metabolism, Dictyostelium metabolism, Fungal Proteins metabolism, Gene Expression, Intracellular Signaling Peptides and Proteins, Molecular Sequence Data, Mutagenesis, Protein Kinases, Sequence Homology, Amino Acid, DNA-Binding Proteins genetics, Dictyostelium growth & development, Fungal Proteins genetics, Protozoan Proteins, Saccharomyces cerevisiae Proteins
- Abstract
We have isolated an insertional mutant of Dictyostelium discoideum that aggregated rapidly and formed spores and stalk cells within 14 h of development instead of the normal 24 h. We have shown by parasexual genetics that the insertion is in the rdeA locus and have cloned the gene. It encodes a predicted 28 kDa protein (RdeA) that is enriched in charged residues and is very hydrophilic. Constructs with the DNA for the c-Myc epitope or for the green fluorescent protein indicate that RdeA is not compartmentalized. RdeA displays homology around a histidine residue at amino acid 65 with members of the H2 module family of phosphotransferases that participate in multistep phosphoryl relays. Replacement of this histidine rendered the protein inactive. The mutant is complemented by transformation with the Ypd1 gene of Saccharomyces cerevisiae, itself an H2 module protein. We propose that RdeA is part of a multistep phosphorelay system that modulates the rate of development.
- Published
- 1998
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