title: In vitro interaction between Saccharomyces cerevisiae CDC25 and RAS2 proteins.
abstract: In Saccharomyces cerevisiae the CDC25 protein is a positive regulator of RAS/cAMP pathway [1-4], enhancing the GDP-releasing rate of RAS2 protein [5]. In this work we have tried to detect a direct interaction between CDC25 and RAS2 gene products. The results indicate that both the whole RAS2 protein and a truncated version that lacks approximately 25 C-terminal residues interact specifically with the CDC25 protein. On the contrary, a derivative of RAS2 that lacks the 112 C-terminal residues as well as the p21TI-ras is not able to bind the CDC25 protein in our assay conditions. The 310 C-terminal aminoacids of CDC25 bind RAS2 while a C-terminus deletion within this aminoacid stretch abolishes the binding. The possible physiological significance of these findings is discussed.
authors.affiliation: Dipartimento di Fisiologia e Biochimica Generali, Università degli Studi di Milano, Italy.
authors.forename: M D
authors.initials: MD
authors.lastname: Baroni
authors.forename: G
authors.initials: G
authors.lastname: Marconi
authors.forename: M C
authors.initials: MC
authors.lastname: Parrini
authors.forename: P
authors.initials: P
authors.lastname: Monti
authors.forename: L
authors.initials: L
authors.lastname: Alberghina
mesh_terms: D015153:Blotting, Western; D018797:Cell Cycle Proteins; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D019204:GTP-Binding Proteins / Q000378:metabolism; D005800:Genes, Fungal; D011485:Protein Binding; D014176:Protein Biosynthesis; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D014158:Transcription, Genetic; D018631:ras Proteins; D020666:ras-GRF1
chemical_list: C542351:CDC25 protein, S cerevisiae; D018797:Cell Cycle Proteins; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D020666:ras-GRF1; D019204:GTP-Binding Proteins; C489015:RAS2 protein, S cerevisiae; D018631:ras Proteins