Progress in Molecular and Subcellular Biology

Association of DNA with Nuclear Matrix.- A. Introduction.- B. MAR Elements and Their Properties.- C. Roles of MAR Elements in DNA Packaging and DNA Replication.- References.- Nuclear Import in Vitro.- A. Overview of Nuclear Import.- B. In Vitro Systems for Studying Nuclear Import.- C. Conclusion.- References.- Cytoplasmic Assembly and Nuclear Transport of the snRNP Particles.- A. Introduction.- B. Maturation of the snRNAs.- C. snRNP Particle Assembly.- D. Nuclear Accumulation of snRNP Particles.- E. Summary and Perspectives.- References.- The Centrosome: Recent Advances on Structure and Functions.- A. Definitions.- B. Isolation of Centrosomes from Somatic Cells.- C. The Structure of Isolated Centrosomes.- D. Centrosomal Proteins.- E. The Centrosome and the Nucleation of Microtubules.- F. The Centrosome Cycle in the Cell Cycle.- G. Centrosome Continuity.- H. Centrosome and the Spindle Formation.- I. Centrosome and the Spatial Organization of Microtubules in Terminally Differentiated Cells.- J. Centrosome and Cell Polarity/Movement.- K. Conclusion.- References.- Role of Nonsense, Frameshift, and Missense Suppressor tRNAs in Mammalian Cells.- A. Introduction.- B. Suppression of Nonsense Codons.- C. Ribosomal Frameshifting.- D. Missense Suppression and Misrecognition of Genetic Codewords.- E. Conclusion.- References.- UAG Suppressor Glutamine tRNA in Uninfected and Retrovirus-Infected Mammalian Cells.- A. Introduction.- B. Isolation and Sequence Analysis of Glutamine tRNA from Mammalian Cells.- C. Analysis of Suppressor Activity of Mammalian Glutamine tRNA.- D. Selective Increase of Suppressor Glutamine tRNA in Retrovirus-Infected Cells.- E. Influence of Increased Amount of Suppressor tRNA on Translation Reaction of Cellular mRNA.- F. Discussion.- References.- Essential Genes for Development of Dictyostelium.- A. Introduction.- B. Genetic Analysis in Dictyostelium.- C. Temporal Sequence of Differentiations.- D. Initiation of Development.- E. Stage 1: Chemotaxis.- F. cAMP Regulation of Transcription and Chemotaxis.- G. Stage 2: Integration.- H. Stage 3: Divergence.- I. Stage 4: Culmination.- J. Dependent Sequence.- References.