Download or read book Mitogen activated Protein Kinase Regulation of Ty1 Retrotransposition in the Yeast Saccharomyces Cerevisiae written by Darryl Conte (Jr.) and published by . This book was released on 2000 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Function and Regulation of Mitogen activated Protein Kinases in the Yeast Saccharomyces Cerevisiae written by Raymond Eric Chen and published by . This book was released on 2008 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Control of the M G1 and G1 S Phase Transitions in Saccharomyces Cerevisiae written by Lorrie Boucher and published by . This book was released on 2007 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mitogen-activated protein kinase (MAPK) cascades convey signals in eukaryotic cells through the sequential phosphorylation and activation of three protein kinases. In yeast, mating and filamentous growth share multiple components of a single MAPK cascade. These kinases are the MAPKKK Ste 11, the MAPKK Ste7 and two MAPKs, Fus3 and Kss1. The transcription factor Ste 12 is the target of both developmental pathways. The first part of this thesis addressed the mechanisms that ensure signal fidelity between the two signal outputs. This work challenges the model that the MAPK Fus3 ensures specificity in the mating response by physically occluding the MAPK Kss1 from the active Ste5 complex. I demonstrated that deletion of either individual MAPK had little affect on the genome-wide transcriptional response to pheromone. Further, catalytically inactive versions of Fus3 largely failed to attenuate the transcriptional response to pheromone in fus3Delta cells, and the exposure to mating pheromone stimulated the kinase activity of both MAPKs. I thus propose that both Fus3 and Kss1 are bona fide components of the mating program. To define the role of distal MAPK components in invasive growth and the presence of an associated transcriptional program, I performed genome-wide transcriptional analysis on combinatorial deletion strains of FUS3, KSS1, RST1 and RST2. This analysis revealed that Rst1 and Fus3 are the dominant inhibitors of invasive growth. By comparing transcriptional profiles of invasive versus non-invasive strains, I demonstrated that there is no concrete transcriptional program associated with invasive growth. Thus, invasive growth can be viewed as a component of the pheromone response. The second part of this thesis focuses on the Mitotic Exit Network (MEN), a signaling cascade that is activated at the end of mitosis to shut down cyclin-dependent kinase (CDK) activity. To identify novel MEN regulators, I used a high-throughput genetic approach to identify synthetic lethal interactions with nine men mutants. In total, 84 genes were identified that I named MEN Interactors (MNIs). The confirmed genetic interactions have provided connections to pathways with previously uncharacterized roles in mitotic exit. Furthermore, this study reveals that the PKC/MAPK pathway may not function in a linear manner with respect to MEN.
Download or read book Function and Signaling Specificity of the Hog1 Mitogen Activated Protein Kinase in the Yeast Saccharomyces Cerevisiae written by Jesse Christopher Patterson and published by . This book was released on 2011 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple mitogen-activated protein kinases (MAPKs) enable eukaryotic cells to evoke an appropriate response when presented with a particular stimulus. In the yeast Saccharomyces cerevisiae, MAPK Hog1 is activated by osmosensors in the high-osmolarity glycerol (HOG) pathway during hyperosmotic stress, MAPK Fus3 is activated by pheromone-binding receptors in the mating pathway, and MAPK Kss1 is activated by mucins in the filamentous growth (FG) pathway during nutrient limitation. These pathways provide an excellent model for studying mechanisms and principles of signal transduction in a genetically and biochemically tractable organism because these conserved pathways have served countless species in their struggle to adapt to change throughout evolution. Upon hyperosmotic shock, yeast cells accumulate intracellular glycerol to balance the osmotic gradient. It had been accepted that Hog1 elevates glycerol production by inducing the transcription of enzymes necessary for glycerol synthesis. Using global microarray analysis, I found that Hog1-dependent transcription is not necessary for hyperosmotic shock survival. Instead, Hog1 increases glycerol production by directly regulating metabolism and work presented in this thesis describes progress made towards understanding how this control is exerted. The HOG, mating and FG pathways share common upstream activators, including Ste50 (adapter protein), Ste20 [p21-activated protein kinase (PAK)], Ste11 [MAPK kinase kinase (MAPKKK)] and Cdc42 [guanosine tri-phosphatase (GTPase)]. Activation of Ste11 within the HOG pathway does not result in Ste11-mediated activation of the mating or FG pathways. Tellingly, if Hog1 function is absent, hyperosmotic stress does result in Ste11-mediated activation of these other MAPK pathways, a situation called crosstalk. Therefore, a mechanism of Hog1-enforced crosstalk prevention exists. Using single-cell analysis of both HOG and mating pathway activation, I found that crosstalk is prevented by insulation of the HOG pathway from other MAPK pathways, over-turning a previously established erroneous model of cross-inhibition. Through a genetic selection, I found that Rga1 [a Cdc42 GTPase-activating protein (GAP)] is required for HOG pathway insulation, that Rga1 is a substrate of Hog1, that it contributes to negative feedback regulation of the HOG pathway, and that Rga1 presumably helps prevent crosstalk by limiting the extent and duration of Cdc42 activation.
Download or read book A Study of Host Factors that Regulate Ty5 Transposition in Saccharomyces Cerevisiae written by Yvette Chin and published by . This book was released on 2003 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Work on the Saccharomyces cerevisiae retrotransposon Ty1 identified several genes that play a role in regulating transposition. To identify general regulators of retrotransposition, seventeen genes implicated in the Ty1 study were analyzed for their effects on Ty5. Among these were genes involved in DNA repair (e.g. MRE11 and XRS2) and transcription (e.g. the SGS1 helicase). Only two genes were found to affect both elements: one of them is RAD52, a gene required for homologous recombination, which when deleted causes a 25-fold increase in Ty1 transposition and a [Difference symbol]5-fold decrease in transposition of Ty5. We predict the decrease in Ty5 transposition is due to lowered levels of Ty5 cDNA that can engage in homologous recombination. A second gene that affects both elements is the map kinase FUS3, which increases transposition 39-fold and 2.6-fold for Ty1 and TY5, respectively. This indicates that both Ty1 and Ty5 are regulated by the signal transduction pathway associated with mating. To further identify factors that regulate Ty5, we studied two yeast strains, W303 and BY4742, which differ by 8-fold in their levels of TY5 transposition. Three conclusions were reached through the analysis of these strains: 1) high transposition is dominant; 2) multiple genes contribute to the transposition difference, and one of these genes is closely linked to ADE2 on chromosome 15; 3) the difference between strains is due to post-transcriptional regulation that affects cDNA synthesis and/or stability.
Download or read book The Role of Protein Kinases in DNA Replication in Saccharomyces Cerevisiae written by S. Sweet and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The initiation of DNA replication at the onset of S phase in eukaryotic cells is a critically important and tightly regulated process. Multiple origins of replication in the genome must be co-ordinately regulated such that duplication of the chromosomes is complete before cell division, whilst also ensuring that no sections of the DNA are over-replicated. In G1 phase of the cell cycle, a large 'pre-replicative complex' (pre-RC) forms at origins consisting of a hexameric Origin Recognition Complex (ORC) as well as Cdc6, Cdt1 and another hexameric complex known as the Minichromosome Maintenance (MCM) complex. At the onset of S phase, two cell cycle regulated protein kinases, the Cyclin Dependent Kinase (CDK) and Cdc7, are activated. Phosphorylation of various proteins by these two enzymes triggers formation of large 'replisome' complexes, initiation of DNA replication from each origin, and disassembly of the pre-RCs. Pre-RC re-assembly is subsequently inhibited until kinase activity falls again after cell division. In this study, we have set about identifying substrates of both CDK and Cdc7 involved in DNA replication in the budding yeast Saccharomyces cerevisiae. Two techniques are employed, the in vitro phosphorylation of arrays of peptides and phosphorylation of pre-RCs assembled in cell-free yeast extracts. Peptide arrays provide a high throughput technique for screening large numbers of potential substrates in a single experiment, whilst pre-RC phosphorylation allows consideration of both tertiary and quaternary structures of the in vivo kinase substrate. Several potential novel substrates of both CDK and Cdc7 are revealed. Pre-RC phosphorylation also reveals a previously unreported phosphorylation of Orc1 by a third kinase which has been identified as Casein Kinase II (CKII).
Download or read book Fields Virology written by David Mahan Knipe and published by Lippincott Williams & Wilkins. This book was released on 2007 with total page 3116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM has same title as book.
Download or read book Mobile DNA III written by Michael Chandler and published by John Wiley & Sons. This book was released on 2015-05-01 with total page 2615 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exploration of the raw power of genetic material to refashion itself to any purpose... Virtually all organisms contain multiple mobile DNAs that can move from place to place, and in some organisms, mobile DNA elements make up a significant portion of the genome. Mobile DNA III provides a comprehensive review of recent research, including findings suggesting the important role that mobile elements play in genome evolution and stability. Editor-in-Chief Nancy L. Craig assembled a team of multidisciplinary experts to develop this cutting-edge resource that covers the specific molecular mechanisms involved in recombination, including a detailed structural analysis of the enzymes responsible presents a detailed account of the many different recombination systems that can rearrange genomes examines the tremendous impact of mobile DNA in virtually all organisms Mobile DNA III is valuable as an in-depth supplemental reading for upper level life sciences students and as a reference for investigators exploring new biological systems. Biomedical researchers will find documentation of recent advances in understanding immune-antigen conflict between host and pathogen. It introduces biotechnicians to amazing tools for in vivo control of designer DNAs. It allows specialists to pick and choose advanced reviews of specific elements and to be drawn in by unexpected parallels and contrasts among the elements in diverse organisms. Mobile DNA III provides the most lucid reviews of these complex topics available anywhere.
Download or read book Molecular Biology of the Cell written by and published by . This book was released on 2000 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleic Acids Abstracts written by and published by . This book was released on 1997 with total page 1158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics Abstracts written by and published by . This book was released on 1998 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Biology Biochemistry and Biophysics written by and published by . This book was released on 2000 with total page 1588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Epigenetics in Plants of Agronomic Importance Fundamentals and Applications written by Raúl Alvarez-Venegas and published by Springer. This book was released on 2014-07-22 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decades, chromatin remodelling has emerged as an important regulator of gene expression and plant defense. This book provides a detailed understanding of the epigenetic mechanisms involved in plants of agronomic importance. The information presented here is significant because it is expected to provide the knowledge needed to develop in the future treatments to manipulate and selectively activate/inhibit proteins and metabolic pathways to counter pathogens, to treat important diseases and to increase crop productivity. New approaches of this kind and the development of new technologies will certainly increase our knowledge of currently known post-translational modifications and facilitate the understanding of their roles in, for example, host-pathogen interactions and crop productivity. Furthermore, we provide important insight on how the plant epigenome changes in response to developmental or environmental stimuli, how chromatin modifications are established and maintained, to which degree they are used throughout the genome, and how chromatin modifications influence each another.
Download or read book Principles of Molecular Virology written by Alan Cann and published by Elsevier. This book was released on 2005-07-26 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Principles of Molecular Virology, Fourth Edition" provides an essential introduction to modern virology in a clear and concise manner. It is a highly enjoyable and readable text with numerous illustrations that enhance the reader's understanding of important principles. It contains new material on virus structure, virus evolution, zoonoses, bushmeat, SARS and bioterrorism. The standard version includes a CD-ROM with Flash animations, virtual interactive tutorials and experiments, self-assessment questions, useful online resources, along with the glossary, classification of subcellular infectious agents and history of virology.
Download or read book Progress in Botany written by K. Esser and published by Springer Science & Business Media. This book was released on 1999-11-12 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: With one volume each year, this series keeps scientists and advanced students informed of the latest developments and results in all areas of the plant sciences. The present volume includes reviews on genetics, cell biology, and vegetation science.
Download or read book Rice Genetics V written by Darshan S. Brar and published by World Scientific. This book was released on 2007 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a collection of the papers presented at the Fifth IRGS in 2005. It reports the latest developments in the field and includes research on breeding, mapping of genes and quantitative trait loci, identification and cloning of cndidate genesfor biotic and abiotic stresses, gene expression, as well as genomic databases and mutant induction for functional genomics
Download or read book Comprehensive and Molecular Phytopathology written by Yuri Dyakov and published by Elsevier. This book was released on 2007-01-09 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a collection of information on successive steps of molecular 'dialogue' between plants and pathogens. It additionally presents data that reflects intrinsic logic of plant-parasite interactions. New findings discussed include: host and non-host resistance, specific and nonspecific elicitors, elicitors and suppressors, and plant and animal immunity. This book enables the reader to understand how to promote or prevent disease development, and allows them to systematize their own ideas of plant-pathogen interactions.* Offers a more extensive scope of the problem as compared to other books in the market* Presents data to allow consideration of host-parasite relationships in dynamics and reveals interrelations between pathogenicity and resistance factors* Discusses beneficial plant-microbe interactions and practical aspects of molecular investigations of plant-parasite relationships* Compares historical study of common and specific features of plant immunity with animal immunity
