Cell and Muscle Motility de Robert M. Dowben

Cell and Muscle Motility: Volume 2

Robert M. Dowben

Jerry W. Shay

The contributions to this volume were presented at a Symposium entitled "Current Topics in Muscle and Nonmuscle Motility" held in Dallas 19-21 November 1980 under the auspices of the A. Webb Roberts Center for Con tinuing Education, Baylor University Medical Center Dallas, and the Univer sity of Texas Health Science Center at Dallas. This very useful opportunity for a group of active investigators in motility to meet and discuss their latest findings was made possible in part by the income from an endowment fund established by a generous gift from Dr. Albert P. D'Errico in the Baylor University Medical Center. Dr. D'Errico was the first formally-trained neurosurgeon to practice in the Dallas area, the first Chief of Neurological Surgery, and a member of the Medical Board of the Baylor University Medi cal Center Dallas (1947 -1964). The income from this fund is used to promote the dissemination of up-to-date information in the Neurosciences, to provide intellectual stimulation, to add to the fund of knowledge, and improve the skills of neurosurgeons, neurologists, internists, and others in specialized fields of medicine. We are all indebted for this generous gift that made this enriching educational experience possible. We are also grateful for support the Symposium received from Electron Microscopy Sciences, Forma Scien tific, J. E. O. L. USA, Inc. , Ladd Research Industries, M. J. O. Diatome Co. , Or ganon Co. , Upjohn Co. , G. D. Searle & Co. , and Smith, Kline and French. Robert M.

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Cuprins

1 Actin Organization as an in Vitro Assay for Tumorigenicity.- 1. Introduction.- 2. Methods.- 3. Results and Discussion.- 4. Conclusions.- References.- 2 The Mechanism of Actin-Filament Assembly and Cross-Linking.- 1. Introduction.- 2. Molecular Structure.- 3. Filament Structure.- 4. Filament Formation.- 5. Regulation of Actin Polymerization.- 6. Actin-Filament Networks.- 7. Structure of Actin-Filament Gels.- 8. Actin-Microtubule Interactions.- 9. Perspectives.- References.- 3 A Scanning and Transmission Electron Microscope Examination of ACTH-Induced “Roundingup” in Triton X-100 Cytoskeleton Residues of Cultured Adrenal Cells.- 1. Introduction.- 2. Materials and Methods.- 3. Results and Discussions.- References.- 4 The Role of Tubulin in Steroidogenesis of Mouse Adrenal Y-l Cells and Rat Leydig CCL 43 Cells.- 1. Introduction.- 2. Materials and Methods.- 3. Observations.- 4. Discussion.- References.- 5 Use of Monoclonal Antibodies to Study Cytoskeleton.- 6 Interaction of Calcium -Calmodulin in Microtubule Assembly in Vitro.- 1. Introduction.- 2. Materials and Methods.- 3. Results.- 4. Discussion.- References.- 7 Microtubules in Adult Mammalian Muscle.- 8 Microtubules and Heart-Cell Contraction.- 1. Introduction.- 2. Materials and Methods.- 3. Results.- 4. Discussion.- References.- 9 The Association of Creatine Phosphokinase with the Mitotic Spindle.- 1. Introduction.- 2. Material and Methods.- 3. Results.- 4. Discussion.- References.- 10 Cytoskeletal Defects in Avian Muscular Dystrophy.- 1. Introduction.- 2. Materials and Methods.- 3. Results.- 4. Discussion.- References.- 11 The Structure of Vertebrate Skeletal-Muscle Myosin Filaments.- 1. Introduction.- 2. Subfilament Spacing.- 3. Parallel Subfilaments.- 4. Threefold Symmetry.- 5. Subfilament Arrangement andNumber.- 6. Sources of Artifacts.- 7. Minifilaments.- 8. Tapered Ends of the Filaments.- 9. Differences in Structure along the Length of the Filaments.- 10. Modeling.- References.- 12 Cross-Bridge Movement and the Conformational State of the Myosin Hinge in Skeletal Muscle.- 13 The Regulation of Myosin-Light-Chain Synthesis in Heterokaryons between Differentiated and Undifferentiated Myogenic Cells.- 14 Phosphorylation of Myosin and the Regulation of Smooth-Muscle Actomyosin.- 1. Introduction.- 2. Contractile Apparatus.- 3. Regulation.- References.- 15 Three-Dimensional Structure of Muscle Membranes Involved in the Regulation of Contraction in Skeletal-Muscle Fibers.- 1. Introduction.- 2. Historical Background.- References.- 16 Mechanism of the Apparent Inhibitory Effect ofMgp2+ and Cap2+ on the Actomyosin MgATPase in Relation to the L2 Light Chain.- 1. Introduction.- 2. Methods.- 3. Results and Discussion.- 4. Conclusions.- References.- 17 Actin Activation of Phosphorylated Aortic Myosin.- 1. Introduction.- 2. Materials and Methods.- 3. Results.- 4. Discussion.- References.- 18 The Regulation of Cardiac-Muscle Contraction by Troponin.- 1. Introduction.- 2. Cap2+ Binding to Cardiac Troponin (CTn) and the Regulation of Contraction.- 3. Interactions of Cardiac-Thin-Filament Proteins in the Regulation of Muscle Contraction.- References.- 19 Fluorescent-Probe Studies of Contractile Proteins.- 1. Introduction.- 2. Physical Principles of Fluorescence Techniques.- 3. Experiments on Myosin and Its Complexes.- 4. Summary.- References.- 20 Myosin Flexibility.- 1. Introduction.- 2. Hinge between Subfragment-1 and the Rod.- 3. Flexibility within the Rod.- 4. Summary.- References.