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The Small GTPase Ran

The Small GTPase Ran


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About the Book

The Ras-related nuclear protein Ran is a member of the so-called Ras-superfamily of small GTP-binding proteins and hydrolyzing proteins. A variety of edited anthologies related to the Ras-superfamily have appeared over the last decade of the 20th century, but Ran has been under-represented in all of them. This under-representation is not due to the fact that Ran is unimportant or non-abundant. It is almost certainly because Ran was discovered and its functions elucidated only recently, and that some of these functions may not follow the typical Ras-superfamily paradigm. Even workers in the field have difficulty keeping up with the Ran literature, and most outsiders rarely try even though they may be aware that major breakthroughs regarding the mechanisms of nuclear-cytosolic transport, mitosis and the maintenance of nuclear structure have depended upon an understanding of Ran function. This text is meant to provide specialists with a concise summary of some of the research in this area, along with background describing its initial identification and early characterization.

Table of Contents:
1. The Role of Ran in Nuclear Import.- 1. Introduction.- 2. The Ran GTPase cycle and how it relates to nuclear protein import.- 3. Concluding remarks.- 4. References.- 2. Ran GTPase Regulation of the CRMl-Dependent Export Pathway.- 1. Introduction.- 2. Nuclear export signals.- 3. Identification of CRMl/exportin 1, the receptor for leucine-rich NES.- 4. Assembly of nuclear export complexes.- 5. Docking and translocation of the export complex through the NPC.- 6. Release of the export complex from the NPC.- 7. Concluding remarks.- 8. References.- 3. Role of Ran GTPase in RNA Processing and Export of RNA from the Nucleus to the Cytosol: Insights from Budding Yeast.- 1. Introduction.- 2. Ran pathway and tRNA biogenesis in S. cerevisiae.- 3. Ran and its role in ribosome biogenesis and nuclear export of ribosomes in S. cerevisiae.- 4. Ran and its role in nuclear export of mRNAs in S. cerevisiae.- 5. Concluding remarks.- 6. Acknowledgements.- 7. References.- 4. Direct and Indirect Roles of Ran·GTP in Nuclear Export of RNAs in Higher Eukaryotes.- 1. Introduction.- 2. Export of tRNA.- 3. Export of pre-snRNAs.- 4. Export of mRNAs.- 5. Export of ribosomal RNAs.- 6. Concluding remarks.- 7. Acknowledgements.- 8. References.- 5. The Role of Ran in Regulating Microtubule Spindle Assembly.- 1. Introduction.- 2. Studies that implicated Ran in the regulation of the microtubule cytoskeleton.- 3. Ran-GTP can stimulate microtubule spindle assembly in vitro.- 4. Generation of Ran-GTP by chromatin-bound RCC1 is required for spindle assembly.- 5. The molecular mechanism by which Ran regulates spindle assembly.- 6. Which spindle-forming processes does Ran regulate?.- 7. A model for how Ran-GTP regulates microtubule spindle assembly.- 8. Does Ran play a role in spindle assembly in vivo?.- 9.Could Ran-GTP have functions other than regulating spindle formation in mitosis?.- 10. Concluding remarks.- 11. Acknowledgements.- 12. References.- 6. Multiple Roles of the Ran GTPase During the Cell Cycle.- 1. Introduction.- 2. Expression of Ran pathway components in development and the cell cycle.- 3. Post-translational regulation of the Ran pathway.- 4. Ran’s role in regulation of the onset and completion of mitosis.- 5. Ran and mitotic spindle assembly.- 6. Ran and post-mitotic nuclear assembly.- 7. Concluding remarks, future directions.- 8. Acknowledgements.- 9. References.- 7. The Multiple Roles of Ran in the Fission Yeast Schizosac-charomyces pombe.- 1. Introduction.- 2. Introduction to the fission yeast S. pombe.- 3. Discovery of S. pombe Ran components.- 4. Localization of S. pombe Ran components.- 5. Phenotypic consequences of perturbing the Ran system.- 6. Evidence that the Ran system has multiple functions in fission yeast.- 7. Comparison of the phenotypic consequences of perturbing the Ran system in S. pombe and other experimental systems.- 8. Concluding remarks: Unanswered questions and future directions regarding the role of Ran in S. pombe.- 9. Acknowledgements.- 10. References.- 8. Mitotic Control by Ran and RanBPl in Mammalian Cells.- 1. Introduction.- 2. Mammalian RanBPl protein: structure and functions.- 3. Localization of components of the Ran network during the cell cycle.- 4.Spindle assembly in mammalian cells.- 5. Mitotic division.- 6. Nuclear reconstitution at mitotic exit.- 7. Concluding remarks.- 8. References.- 9. Ran Regulation by Ran GEF and Ran GAP.- 1. Introduction.- 2. Ran GEF stimulates guanine nucleotide exchange, and the resulting active Ran-GTP terminates import into the nucleus.- 3. In the cytoplasm, RanGAP induces Ran GTPaseactivity….- 4.…with some help from RanBP2 and RanBPl.- 5. Mogl induces release of GTP from Ran.- 6. Concluding remarks.- 7. References.- 10. Structural Views of the Ran GTPase Cycle.- 1. Introduction.- 2. Ran·GTP and Ran-GDP, active and inactive conformations.- 3. NTF2, a binding partner of Ran·GDP.- 4. Activation: RCC1 and its complex with Ran.- 5. Deactivation: Ran·GAP.- 6. Effectors of Ran.- 9. References.- 7. Concluding remarks.- 8. Acknowledgments.


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Product Details
  • ISBN-13: 9780792375104
  • Publisher: Kluwer Academic Publishers
  • Publisher Imprint: Kluwer Academic Publishers
  • Height: 235 mm
  • No of Pages: 214
  • Returnable: Y
  • ISBN-10: 0792375106
  • Publisher Date: 30 Sep 2001
  • Binding: Hardback
  • Language: English
  • Returnable: Y
  • Width: 155 mm


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