The C-terminal part of the CDC25 gene product has Ras-nucleotide exchange activity when present in a chimeric SDC25-CDC25 protein |
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Authors: | Emmanuelle Boy-Marcotte Antoinette Buu Christine Soustelle Patrick Poullet Andrea Parmeggiani Michel Jacquet |
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Institution: | (1) IGD, Institut de Génétique et de Microbiologie, URA C.N.R.S. 1354, Université Paris-Sud, Bât 400, F-91405 Orsay Cedex, France;(2) Structures Diverses d'Intervention No 61840 du CNRS, Laboratoire de Biochimie, Ecole Polytechnique, F-91128 Palaiseau Cedex, France |
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Abstract: | The CDC25 gene from S. cerevisiae encodes an activator of Ras proteins. The C-terminal part of a structurally-related protein encoded by the SDC25 gene is characterised by a Ras-guanine nucleotide exchange activity in vitro whereas the C-terminal part of CDC25 gives no detectable exchange activity. A chimera between the 3 regions of these two genes was constructed by homeologous recombination. This chimeric gene suppresses cdc25 mutations. When expressed in E. coli, the chimeric product is detectable by antibodies directed against the carboxy-terminal CDC25 peptide and has an exchange-factor activity on the Ras2 protein. Therefore, the carboxy-terminal parts of both the CDC25 and the SDC25 gene products are structurally and functionally similar. The CDC25 part of the chimeric protein contains an intrinsic guanine exchange factor which does not require an additional cofactor. |
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Keywords: | Homoeologous recombination Ras SDC25 CDC25 |
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