Ran Activation Assay Kit
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Characterization of Gf a Drosophila Trimeric G Protein Alpha Subunit
Characterization of Gf a Drosophila trimeric G protein alpha subunit Naureen Quibria Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Graduate School of Arts and Sciences COLUMBIA UNIVERSITY 2012 © 2012 Naureen Quibria All rights reserved Abstract Characterization of Gf a Drosophila trimeric G-protein alpha subunit Naureen Quibria In the morphogenesis of tissue development, how coordination of patterning and growth achieve the correct organ size and shape is a principal question in biology. Efficient orchestrating mechanisms are required to achieve this and cells have developed sophisticated systems for reception and interpretation of the multitude of extracellular stimuli to which they are exposed. Plasma membrane receptors play a key role in the transmission of such signals. G-protein coupled receptors (GPCRs) are the largest class of cell surface receptors that respond to an enormous diversity of extracellular stimuli, and are critical mediators of cellular signal transduction in eukaryotic organisms. Signaling through GPCRs has been well characterized in many biological contexts. While they are a major class of signal transducers, there are not many defined instances where GPCRs have been implicated in the process of development to date. The Drosophila wing provides an ideal model system to elucidate and address the role of GPCRs in development, as its growth is regulated by a small number of conserved signaling pathways. In my thesis work, I address the role of a trimeric G alpha protein in Drosophila, Gαf, and what part it may play in development. In particular, I explore the role of Gαf as an alpha subunit of a trimeric complex, to determine what heptahelical receptors might act as its cognate receptor. -
Rhob Controls Endothelial Barrier Recovery by Inhibiting Rac1 Trafficking to the Cell Border
JCB: Article RhoB controls endothelial barrier recovery by inhibiting Rac1 trafficking to the cell border Beatriz Marcos‑Ramiro,1 Diego García‑Weber,1 Susana Barroso,1 Jorge Feito,2 María C. Ortega,1 Eva Cernuda‑Morollón,3 Natalia Reglero‑Real,1 Laura Fernández‑Martín,1 Maria C. Durán,4 Miguel A. Alonso,1 Isabel Correas,1 Susan Cox,5 Anne J. Ridley,5 and Jaime Millán1 1Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Cientificas, Universidad Autónoma de Madrid, 28049 Madrid, Spain 2Servicio de Anatomía Patológica, Hospital Universitario de Salamanca, 37007 Salamanca, Spain 3Neurology Department, Hospital Universitario Central de Asturias, 33011 Oviedo, Spain 4Biomedicine, Biotechnology and Public Health Department, University of Cadiz, 11519 Cadiz, Spain 5Randall Division of Cell and Molecular Biophysics, King’s College London, SE1 1UL London, England, UK Endothelial barrier dysfunction underlies chronic inflammatory diseases. In searching for new proteins essential to the human endothelial inflammatory response, we have found that the endosomal GTPase RhoB is up-regulated in response to inflammatory cytokines and expressed in the endothelium of some chronically inflamed tissues. We show that al- though RhoB and the related RhoA and RhoC play additive and redundant roles in various aspects of endothelial barrier function, RhoB specifically inhibits barrier restoration after acute cell contraction by preventing plasma membrane ex- tension. During barrier restoration, RhoB trafficking is induced between vesicles containing RhoB nanoclusters and plasma membrane protrusions. The Rho GTPase Rac1 controls membrane spreading and stabilizes endothelial barriers. We show that RhoB colocalizes with Rac1 in endosomes and inhibits Rac1 activity and trafficking to the cell border during barrier recovery. -
The Rab11-Binding Protein Gaf-1B Is a Novel Interaction Partner of Calsyntenin-1
Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2012 The role pf Gaf-1b in intracellular trafficking and autophagy Diep, Tu-My Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-68814 Dissertation Published Version Originally published at: Diep, Tu-My. The role pf Gaf-1b in intracellular trafficking and autophagy. 2012, University of Zurich, Faculty of Science. The Role of Gaf-1b in Intracellular Trafficking and Autophagy Dissertation zur Erlangung der naturwissenschaftlichen Doktorwürde (Dr. sc. nat) vorgelegt der Mathematisch-naturwissenschaftlichen Fakultät der Universität Zürich von Tu-My Diep von Bern Promotionskomitee Prof. Dr. Peter Sonderegger (Vorsitz) Prof. Dr. Jack Rohrer Dr. Uwe Konietzko Zürich 2012 CONTENTS Contents Summary ................................................................................................................... 1 Zusammenfassung ................................................................................................... 3 Abbreviations ............................................................................................................ 5 Publications .............................................................................................................. 9 1. Introduction ......................................................................................................... 11 1.1 Intracellular Transport ................................................................................................................ -
Discovery and the Genic Map of the Human Genome
Downloaded from genome.cshlp.org on October 6, 2021 - Published by Cold Spring Harbor Laboratory Press RESEARCH The Genexpress Index: A Resource for Gene Discovery and the Genic Map of the Human Genome R6mi Houlgatte, 1'2'3' R6gine Mariage-Samson, 1'2'3 Simone Duprat, 2 Anne Tessier, 2 Simone Bentolila, 1'2 Bernard Lamy, 2 and Charles Auffray 1'2'4 1Genexpress, Centre National de la Recherche Scientifique (CNRS) UPR420, 94801 Villejuif CEDEX, France; 2Genexpress, G4n6thon, 91002 Evry CEDEX, France Detailed analysis of a set of 18,698 sequences derived from both ends of 10,979 human skeletal muscle and brain cDNA clones defined 6676 functional families, characterized by their sequence signatures over 5750 distinct human gene transcripts. About half of these genes have been assigned to specific chromosomes utilizing 2733 eSTS markers, the polymerase chain reaction, and DNA from human-rodent somatic cell hybrids. Sequence and clone clustering and a functional classification together with comprehensive data base searches and annotations made it possible to develop extensive sequence and map cross-indexes, define electronic expression profiles, identify a new set of overlapping genes, and provide numerous new candidate genes for human pathologies. During the last 20 years, since the first descrip- 1993; Park et al. 1993; Takeda et al. 1993; Affara tions of eucaryotic cDNA cloning (Rougeon et al. et al. 1994; Davies et al. 1994; Kerr et al. 1994; 1975; Efstratiadis et al. 1976), cDNA studies have Konishi et al. 1994; Kurata et al. 1994; Liew et al. played a central role in molecular genetics. Early 1994; Murakawa et al. -
Functional Analysis of the Contribution of Rhoa and Rhoc Gtpases to Invasive Breast Carcinoma
[CANCER RESEARCH 64, 8694–8701, December 1, 2004] Functional Analysis of the Contribution of RhoA and RhoC GTPases to Invasive Breast Carcinoma Kaylene J. Simpson, Aisling S. Dugan, and Arthur M. Mercurio Division of Cancer Biology and Angiogenesis, Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston Massachusetts ABSTRACT from many cell lines, are limiting and cannot address this issue specifically. Although the RhoA and RhoC proteins comprise an important subset Analysis of the contribution of the RhoA and RhoC isoforms to of the Rho GTPase family that have been implicated in invasive breast aggressive disease has been hampered by a lack of appropriate mo- carcinomas, attributing specific functions to these individual members has been difficult. We have used a stable retroviral RNA interference ap- lecular tools. Seminal studies on Rho protein function have used proach to generate invasive breast carcinoma cells (SUM-159 cells) that dominant-negative and constitutive-active approaches, alongside bio- lack either RhoA or RhoC expression. Analysis of these cells enabled us to chemical ablation by Clostridium difficile toxin or Clostridium botu- deduce that RhoA impedes and RhoC stimulates invasion. Unexpectedly, linum C3 exoenzyme treatment (reviewed in ref. 15). These methods this analysis also revealed a compensatory relationship between RhoA and however, are unable to distinguish among individual Rho isoforms RhoC at the level of both their expression and activation, and a reciprocal because of their high sequence similarity, particularly at regions of relationship between RhoA and Rac1 activation. functional importance. Recently, Wang et al. (16) showed that the Rho proteins are functionally distinct through the use of chimeric p190RhoGAP proteins specific for each isoform. -
Expression Signatures of the Lipid-Based Akt Inhibitors Phosphatidylinositol Ether Lipid Analogues in NSCLC Cells
Published OnlineFirst May 6, 2011; DOI: 10.1158/1535-7163.MCT-10-1028 Molecular Cancer Therapeutic Discovery Therapeutics Expression Signatures of the Lipid-Based Akt Inhibitors Phosphatidylinositol Ether Lipid Analogues in NSCLC Cells Chunyu Zhang1, Abdel G. Elkahloun2, Hongling Liao3, Shannon Delaney1, Barbara Saber1, Betsy Morrow1, George C. Prendergast4, M. Christine Hollander1, Joell J. Gills1, and Phillip A. Dennis1 Abstract Activation of the serine/threonine kinase Akt contributes to the formation, maintenance, and therapeutic resistance of cancer, which is driving development of compounds that inhibit Akt. Phosphatidylinositol ether lipid analogues (PIA) are analogues of the products of phosphoinositide-3-kinase (PI3K) that inhibit Akt activation, translocation, and the proliferation of a broad spectrum of cancer cell types. To gain insight into the mechanism of PIAs, time-dependent transcriptional profiling of five active PIAs and the PI3K inhibitor LY294002 (LY) was conducted in non–small cell lung carcinoma cells using high-density oligonucleotide arrays. Gene ontology analysis revealed that genes involved in apoptosis, wounding response, and angiogen- esis were upregulated by PIAs, whereas genes involved in DNA replication, repair, and mitosis were suppressed. Genes that exhibited early differential expression were partitioned into three groups; those induced by PIAs only (DUSP1, KLF6, CENTD2, BHLHB2, and PREX1), those commonly induced by PIAs and LY (TRIB1, KLF2, RHOB, and CDKN1A), and those commonly suppressed by PIAs and LY (IGFBP3, PCNA, PRIM1, MCM3, and HSPA1B). Increased expression of the tumor suppressors RHOB (RhoB), KLF6 (COPEB), and CDKN1A (p21Cip1/Waf1) was validated as an Akt-independent effect that contributed to PIA-induced cytotoxicity. Despite some overlap with LY, active PIAs have a distinct expression signature that contributes to their enhanced cytotoxicity. -
New Targets of Urocortin-Mediated Cardioprotection
69 New targets of urocortin-mediated cardioprotection Sea´n P Barry1, Kevin M Lawrence4, James McCormick1, Surinder M Soond5, Mike Hubank2, Simon Eaton3, Ahila Sivarajah6, Tiziano M Scarabelli7, Richard A Knight1, Christoph Thiemermann6, David S Latchman1, Paul A Townsend8 and Anastasis Stephanou1 1Medical Molecular Biology Unit, 2Department of Molecular Haematology and 3Department of Surgery, Institute of Child Health, University College London, 30 Guilford Street, London, WC1N 1EH, UK 4Department of Cellular Pathology, St George’s, University of London, Cranmer Terrace, Tooting, London, SW17 0RE, UK 5School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK 6St Bartholomew’s and The Royal London School of Medicine and Dentistry, William Harvey Research Institute, Centre for Translational Medicine and Therapeutics, Queen Mary University of London, London, EC1M 7BQ, UK 7Center for Heart and Vessel Preclinical Studies, St John Hospital and Medical Center, Wayne State University School of Medicine, 22201 Moross Road, Detroit, Michigan 48336, USA 8Human Genetics Division, MP808, Southampton General Hospital, University of Southampton, Southampton SO16 6YD, UK (Correspondence should be addressed to S P Barry; Email: [email protected]) Abstract The urocortin (UCN) hormones UCN1 and UCN2 have been shown previously to confer significant protection against myocardial ischaemia/reperfusion (I/R) injury; however, the molecular mechanisms underlying their action are poorly understood. To further define the transcriptional effect of UCNs that underpins their cardioprotective activity, a microarray analysis was carried out using an in vivo rat coronary occlusion model of I/R injury. Infusion of UCN1 or UCN2 before the onset of reperfusion resulted in the differential regulation of 66 and 141 genes respectively, the majority of which have not been described previously. -
High Throughput Strategies Aimed at Closing the GAP in Our Knowledge of Rho Gtpase Signaling
cells Review High Throughput strategies Aimed at Closing the GAP in Our Knowledge of Rho GTPase Signaling Manel Dahmene 1, Laura Quirion 2 and Mélanie Laurin 1,3,* 1 Oncology Division, CHU de Québec–Université Laval Research Center, Québec, QC G1V 4G2, Canada; [email protected] 2 Montréal Clinical Research Institute (IRCM), Montréal, QC H2W 1R7, Canada; [email protected] 3 Université Laval Cancer Research Center, Québec, QC G1R 3S3, Canada * Correspondence: [email protected] Received: 21 May 2020; Accepted: 7 June 2020; Published: 9 June 2020 Abstract: Since their discovery, Rho GTPases have emerged as key regulators of cytoskeletal dynamics. In humans, there are 20 Rho GTPases and more than 150 regulators that belong to the RhoGEF, RhoGAP, and RhoGDI families. Throughout development, Rho GTPases choregraph a plethora of cellular processes essential for cellular migration, cell–cell junctions, and cell polarity assembly. Rho GTPases are also significant mediators of cancer cell invasion. Nevertheless, to date only a few molecules from these intricate signaling networks have been studied in depth, which has prevented appreciation for the full scope of Rho GTPases’ biological functions. Given the large complexity involved, system level studies are required to fully grasp the extent of their biological roles and regulation. Recently, several groups have tackled this challenge by using proteomic approaches to map the full repertoire of Rho GTPases and Rho regulators protein interactions. These studies have provided in-depth understanding of Rho regulators specificity and have contributed to expand Rho GTPases’ effector portfolio. Additionally, new roles for understudied family members were unraveled using high throughput screening strategies using cell culture models and mouse embryos. -
Open Questions: What About the 'Other' Rho Gtpases?
Ridley BMC Biology (2016) 14:64 DOI 10.1186/s12915-016-0289-7 COMMENT Open Access Open questions: what about the ‘other’ Rho GTPases? Anne J. Ridley Abstract know if they interact with and/or regulate the activity of other family members. Indeed, by studying only RhoA, Rho GTPases have many and diverse roles in cell Rac1 and Cdc42, we are likely to be missing the real physiology, and some family members are very well functions of many GEFs and GAPs because their targets studied, including RhoA, Rac1 and Cdc42. But many in cells are among the other Rho GTPases. are relatively neglected, and fundamental questions Interestingly, four family members—Rnd1, Rnd2, Rnd3 about their mechanisms and functions remain open. and RhoH—are ‘atypical’, in that they are known to be constitutively GTP-bound and do not hydrolyse GTP: much less is known about how these family members Rho GTPases are household names for anyone who are regulated. RhoU and RhoV have high intrinsic GDP/ works on eukaryotic cell migration and their functions GTP exchange rates, so are unlikely to need GEFs for in cell migration, cell division and cell polarity are de- activation but could still be turned off by GAPs [1, 4]. scribed in most textbooks on cell biology. Yet most of For two other members, RhoBTB1 and RhoBTB2, the what we know about Rho GTPases comes from studying Rho domains are quite divergent in sequence from other a small subset of the many different family members, family members and they are unlikely to be regulated by namely RhoA, Rac1 and Cdc42. -
4 Understanding the Role of GNA13 Deregulation in Lymphomagenesis
Integrative Genomics Reveals a Role for GNA13 in Lymphomagenesis by Adrienne Greenough University Program in Genetics and Genomics Duke University Approved: ___________________________ Sandeep Dave, Supervisor ___________________________ Fred Dietrich ___________________________ Jack Keene ___________________________ Yuan Zhuang Dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the University Program in Genetics and Genomics in the Graduate School of Duke University 2014 i v ABSTRACT Integrative Genomics Reveals a Role for GNA13 in Lymphomagenesis by Adrienne Greenough University Program in Genetics and Genomics Duke University Approved: ___________________________ Sandeep Dave, Supervisor ___________________________ Fred Dietrich ___________________________ Jack Keene ___________________________ Yuan Zhuang An abstract of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the University Program in Genetics and Genomics in the Graduate School of Duke University 2014 Copyright by Adrienne Greenough 2014 Abstract Lymphomas comprise a diverse group of malignancies derived from immune cells. High throughput sequencing has recently emerged as a powerful and versatile method for analysis of the cancer genome and transcriptome. As these data continue to emerge, the crucial work lies in sorting through the wealth of information to hone in on the critical aspects that will give us a better understanding of biology and new insight for how to treat disease. Finding the important signals within these large data sets is one of the major challenges of next generation sequencing. In this dissertation, I have developed several complementary strategies to describe the genetic underpinnings of lymphomas. I begin with developing a better method for RNA sequencing that enables strand-specific total RNA sequencing and alternative splicing profiling in the same analysis. -
Figure S1. HAEC ROS Production and ML090 NOX5-Inhibition
Figure S1. HAEC ROS production and ML090 NOX5-inhibition. (a) Extracellular H2O2 production in HAEC treated with ML090 at different concentrations and 24 h after being infected with GFP and NOX5-β adenoviruses (MOI 100). **p< 0.01, and ****p< 0.0001 vs control NOX5-β-infected cells (ML090, 0 nM). Results expressed as mean ± SEM. Fold increase vs GFP-infected cells with 0 nM of ML090. n= 6. (b) NOX5-β overexpression and DHE oxidation in HAEC. Representative images from three experiments are shown. Intracellular superoxide anion production of HAEC 24 h after infection with GFP and NOX5-β adenoviruses at different MOIs treated or not with ML090 (10 nM). MOI: Multiplicity of infection. Figure S2. Ontology analysis of HAEC infected with NOX5-β. Ontology analysis shows that the response to unfolded protein is the most relevant. Figure S3. UPR mRNA expression in heart of infarcted transgenic mice. n= 12-13. Results expressed as mean ± SEM. Table S1: Altered gene expression due to NOX5-β expression at 12 h (bold, highlighted in yellow). N12hvsG12h N18hvsG18h N24hvsG24h GeneName GeneDescription TranscriptID logFC p-value logFC p-value logFC p-value family with sequence similarity NM_052966 1.45 1.20E-17 2.44 3.27E-19 2.96 6.24E-21 FAM129A 129. member A DnaJ (Hsp40) homolog. NM_001130182 2.19 9.83E-20 2.94 2.90E-19 3.01 1.68E-19 DNAJA4 subfamily A. member 4 phorbol-12-myristate-13-acetate- NM_021127 0.93 1.84E-12 2.41 1.32E-17 2.69 1.43E-18 PMAIP1 induced protein 1 E2F7 E2F transcription factor 7 NM_203394 0.71 8.35E-11 2.20 2.21E-17 2.48 1.84E-18 DnaJ (Hsp40) homolog. -
Clinical Colorectal Cancer, Vol
Original Study A Plasma-Based Protein Marker Panel for Colorectal Cancer Detection Identified by Multiplex Targeted Mass Spectrometry Jeffrey J. Jones,1 Bruce E. Wilcox,1 Ryan W. Benz,1 Naveen Babbar,1 Genna Boragine,1 Ted Burrell,1 Ellen B. Christie,1 Lisa J. Croner,1 Phong Cun,1 Roslyn Dillon,1 Stefanie N. Kairs,1 Athit Kao,1 Ryan Preston,1 Scott R. Schreckengaust,1 Heather Skor,1 William F. Smith,1 Jia You,1 W. Daniel Hillis,2 David B. Agus,3 John E. Blume1 Abstract Combining potential diagnostics markers might be necessary to achieve sufficient diagnostic test performance in a complex state such as cancer. Applying this philosophy, we have identified a 13-protein, blood-based classifier for the detection of colorectal cancer. Using mass spectrometry, we evaluated 187 proteins in a case-control study design with 274 samples and achieved a validation of 0.91 receiver operating characteristic area under the curve. Introduction: Colorectal cancer (CRC) testing programs reduce mortality; however, approximately 40% of the rec- ommended population who should undergo CRC testing does not. Early colon cancer detection in patient populations ineligible for testing, such as the elderly or those with significant comorbidities, could have clinical benefit. Despite many attempts to identify individual protein markers of this disease, little progress has been made. Targeted mass spectrometry, using multiple reaction monitoring (MRM) technology, enables the simultaneous assessment of groups of candidates for improved detection performance. Materials and Methods: A multiplex assay was developed for 187 candidate marker proteins, using 337 peptides monitored through 674 simultaneously measured MRM transitions in a 30-minute liquid chromatography-mass spectrometry analysis of immunodepleted blood plasma.