Inhibition of ras-Induced Oocyte Maturation by Peptides from ras-p21 and GTPase Activating Protein (GAP) Identified as Being Effector Domains from Molecular Dynamics Calculations
| Autor: | Ziro Yamaizumi, Matthew R. Pincus, Paul W. Brandt-Rauf, Denise Chung, Fred K. Friedman, Lyndon Chie, Richard C. Robinson |
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| Rok vydání: | 2002 |
| Předmět: |
Time Factors
GTPase-activating protein Molecular Sequence Data Oncogene Protein p21(ras) Biology medicine.disease_cause Biochemistry Proto-Oncogene Proteins p21(ras) Xenopus laevis Protein structure Escherichia coli medicine Animals Insulin Bioorganic chemistry Amino Acid Sequence Enzyme Inhibitors Binding site Peptide sequence Progesterone Binding Sites Dose-Response Relationship Drug Effector GTPase-Activating Proteins Oocyte Peptide Fragments Protein Structure Tertiary Cell biology medicine.anatomical_structure Amino Acid Substitution Oocytes Signal Transduction |
| Zdroj: | Journal of Protein Chemistry. 21:361-366 |
| ISSN: | 1573-4943 0277-8033 |
| DOI: | 10.1023/a:1019946419111 |
| Popis: | In the accompanying article, using molecular dynamics calculations, we found that the 66-77 and 122-138 domains in ras-p21 and the 821-827, 832-845, 917-924, 943-953, and 1003-1020 domains in GAP have different conformations in complexes of GAP with wild-type and oncogenic ras-p21. We have now synthesized peptides corresponding to each of these domains and coinjected them into oocytes with oncogenic p21, which induces oocyte maturation, or injected them into oocytes incubated with insulin that induces maturation by activating wild-type cellular ras-p21. We find that all of these peptides inhibit both agents but do not inhibit progesterone-induced maturation that occurs by a ras-independent pathway. The p21 66-77 and 122-138 peptides cause greater inhibition of oncogenic p21. On the other hand, the GAP 832-845 and 1003-1021 peptides inhibit insulin-induced maturation to a significantly greater extent. Since we have found that activated wild-type and oncogenic p21 activate downstream targets like raf differently, these GAP peptides may be useful probes for identifying elements unique to the wild-type ras-p21 pathway. |
| Databáze: | OpenAIRE |
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