Table of Contents

1 Probing the Cytoskeleton by Microinjection.- 1. Introduction.- 2. The Microtubule System.- 3. The Microfilament System.- 4. The Intermediate Filament System.- 5. The Coated Vesicle System.- 6. Conclusion.- References.- 2 Structural Aspects of Intermediate Filaments.- 1. Introduction.- 2. Domain Organization of IF Proteins.- 3. Neurofilaments.- 4. Organization of the Sequences along the Rod Domain.- 5. Comparison of the Six Nonepithelial Proteins along the Rod Domain.- 6. Structural Characterization of the Rod.- 7. From the Rodlike Protofilament to the 10-nm Filament.- 8. Structure and Function of the Terminal Domains in IF Proteins.- 9. Addendum.- References.- 3 The Structure and Evolution of Intermediate Filament Genes.- 1. Introduction.- 2. Structure of Intermediate Filament Genes.- 3. A Model for the Evolution of Intermediate Filament Genes.- 4. Conclusion.- References.- 4 Differential Expression of the Genes Encoding the Keratins of Cultured Human Epidermal Cells.- 1.Introduction.- 2.The Structure of the 8-nm Keratin Filaments of Epidermis.- 3. The Genes Encoding the Human Epidermal Keratins.- 4. Structure of the Two Types of Keratin Genes and Their Relation to Other Intermediate-Filament Genes.- 5. Regulation of the Type I and Type II Keratin Genes.- References.- 5 Organization and Expression of the Vimentin and Desmin Genes.- 1. The Discovery of Intermediate Filaments.- 2. The Diversity of IF Subunits.- 3. The Genes Encoding IF.- 4. Expression of the Cloned Desmin Gene.- 5. Chromosome Localization of the Human Vimentin and Desmin Gene.- References.- 6 Actin: A Regulator of Cell Growth and Differentiation.- 1. Introduction.- 2. Cell Morphology and Growth and Differentiation.- 3. Regulation of Actin Gene Expression.- 4. Is Actin a Protooncogene?.- 5. Mechanisms byWhich Actin May Regulate Cell Growth and Differentiation.- References.- 7 The Actin Genes in Caenorhabditis elegans.- 1. Introduction.- 2. Genomic Organization.- 3. Sequence Analysis.- 4. Transcription.- 5. Translational Products.- 6. Identification of Actin Mutants.- 7. Actin Gene Organization in Revertants of Actin Mutants.- 8. Transcription in Revertants.- 9. Future Prospects.- References.- 8 Implications of Microtubule Polarity for Microtubule Function.- 1. Introduction.- 2. Background and Methods for Determining MT Polarity.- 3. MT Polarity and Spindle Function.- 4. MT Polarity and Intracellular Motility.- References.- 9 Molecular Mechanisms Controlling Tubulin Synthesis.- 1. Introduction.- 2. Apparent Autoregulatory Control of Tubulin Synthesis in Animal Cells.- 3. Programmed Synthesis of Tubulin during Flagellar Growth in Unicellular Organisms.- 4. Programmed Synthesis of Tubulin during the Cell Cycle.- 5. Summary.- References.- 10 Regulation of Tubulin Expression in Brain.- 1. Introduction.- 2. Tubulin Proteins.- 3. Tubulin Genes in Higher Eukaryotes.- 4. Expression of ?-Tubulin mRNAs.- 5.Expression of ?-Tubulin mRNAs.- 6. Conclusions.- References.- 11 Tubulins from Plants, Fungi, and Protists: A Review.- 1. Introduction: Scope and Objectives.- 2. Isolation and Identification of Tubulin.- 3. Tubulin Dimer Structure.- 4. Antimicrotubule Drugs.- 5. Summary and Future Directions.- References.

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