DOCSLIB.ORG

Substrate Recognition of MARTX Ras/Rap1 Specific Endopeptidase

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Substrate Recognition of MARTX Ras/Rap1 Specific Endopeptidase Substrate Recognition of MARTX Ras/Rap1-Specific Endopeptidase The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Biancucci, Marco et al. “Substrate Recognition of MARTX Ras/Rap1- Specific Endopeptidase.” Biochemistry 56, 21 (May 2017): 2747–2757 © 2017 American Chemical Society As Published http://dx.doi.org/10.1021/ACS.BIOCHEM.7B00246 Publisher American Chemical Society (ACS) Version Author's final manuscript Citable link http://hdl.handle.net/1721.1/116350 Terms of Use Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. HHS Public Access Author manuscript Author ManuscriptAuthor Manuscript Author Biochemistry Manuscript Author . Author manuscript; Manuscript Author available in PMC 2018 May 30. Published in final edited form as: Biochemistry. 2017 May 30; 56(21): 2747–2757. doi:10.1021/acs.biochem.7b00246. Substrate recognition of MARTX Ras/Rap1 specific endopeptidase Marco Biancucci1, Amy E. Rabideau2,†, Zeyu Lu2, Alex R. Loftis2, Bradley L. Pentelute2, and Karla J. F. Satchell1,* 1Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611 USA 2Department of Chemistry, Massachusetts Institute of Technology, Boston, MA 02139 USA Abstract Ras/Rap1-specific endopeptidase (RRSP) is a cytotoxic effector domain of Multifunctional- autoprocessing repeats-in-toxins (MARTX) toxin of highly virulent strains of Vibrio vulnificus. RRSP blocks RAS-MAPK kinase signaling by cleaving Ras and Rap1 within the Switch I region between Y32 and D33. Although the RRSP processing site is highly conserved among small GTPases, only Ras and Rap1 have been identified as proteolytic substrates. Here we report that Y32-D33 residues at the scissile bond play an important role for RRSP substrate recognition, while nucleotide state of Ras has only a minimal effect. In addition, substrate specificity is generated by residues across the entire Switch I region. Indeed, swapping the Ras Switch I region into either RalA or RhoA, GTPases that are not recognized by RRSP, generated chimeras that are substrates of RRSP. However, a difference in processing efficiency of the Ras Switch I in the context of Ras, RalA, or RhoA indicates that protein regions outside the Ras Switch I also contribute to efficient RRSP substrate recognition. Moreover, we show that synthetic peptides corresponding to the Ras and Rap1, but not RalA, Switch I regions are cleaved by RRSP demonstrating sequence specific substrate recognition. In conclusion, this work demonstrates that the GTPase recognition of RRSP is nucleotide independent, and is mainly driven by the Ras and Rap1 Switch I loop and also influenced by additional protein-protein interactions, increasing the substrate specificity of RRSP. *Corresponding Author: Department of Microbiology-Immunology, Northwestern University, Feinberg School of Medicine, 303 E. Chicago Avenue, Ward 6-205, Chicago IL 60611 USA; [email protected]. Phone: 312-503-2162. †Current address: A.E.R. Moderna Therapeutics, Cambridge, MA, USA 02139 ORCID Karla Satchell: 0000-0003-3274-7611 Author Contributions M.B. conceived and conducted most of the experiments, analyzed the data and coordinated the study. Z.L. A.R.L. A.E.R., and B.L.P. produced the synthetic peptides, conducted in vitro cleavage studies, and analyzed data. M.B. and K.J.F.S. wrote the manuscript. All authors reviewed the results and approved the final version of the manuscript. Notes M.B. and K.J.F.S. hold a patent application covering RRSP application. The remaining authors declare no competing financial interest. ASSOCIATED CONTENT Supporting Information. Figure S1 (.pdf) Table S1 (.pdf) List S1 (.pdf) Biancucci et al. Page 2 Author ManuscriptAuthor Keywords Manuscript Author Manuscript Author Manuscript Author bacterial toxin; Ras protein; Ras-related protein 1; GTPase KRas; bacterial pathogenesis; RRSP; endopeptidase; substrate specificity TEXT Vibrio vulnificus is a motile Gram-negative foodborne pathogen that can cause life- threatening infections. Ingestion of contaminated seafood or the exposure of open wounds to water harboring V. vulnificus can result in fatal septicemia, gastroenteritis and necrotizing fasciitis. The mortality rate of human subjects with liver damage or compromised immune systems can be greater than 50%1, 2. The severity of V. vulnificus infection is due to the secretion of the cytolytic pore-forming V. vulnificus cytolysin (VVC) and the multifunctional autoprocessing repeats-in-toxin (MARTXVv) toxin, which together diminish the innate immune response and induce tissue necrosis at the site of infection, helping the 3–10 bacterial to invade and spread systemically . In particular, MARTXVv has been recognized as the most significant virulence factor for V. vulnificus pathogenesis5–9, 11, 12. MARTX toxins are large protein toxins (3500–5300 aa) secreted by Gram-negative bacteria13. MARTX toxins may carry up to five different enzymatically active effector domains that are delivered into the eukaryotic cytosol across the plasma membrane13. Once in the cytosol, the MARTX cysteine protease domain (CPD) binds inositol hexakisphosphate, initiating autoprocessing of the toxin at leucine residues located in unstructured regions that link the effector domains14. When released in target cells, each effector domain has a unique enzymatic function, resulting in cytopathicity or cytotoxicity15–20. The toxin effector designated Domain of Unknown Function in position 5 (DUF5) is carried 21 by some, but not all, V. vulnificus MARTXVv toxins . Notably, a V. vulnificus strain producing a MARTXVv toxin with DUF5 shows about 50-fold higher LD50 in mice than strains producing a toxin without DUF521. In addition, delivery of DUF5 alone into cells results in cytotoxicity characterized by cell rounding and lack of cell proliferation15, 22. In order to understand how DUF5 dramatically increases the virulence potential of V. vulnificus, we recently solved its molecular mechanism within cells. DUF5 directly inhibits the mitogen-activated protein kinases pathway (MAPK) by proteolytically processing the small guanosine triphosphatase (GTPase) Ras, thereby preventing the phosphorylation of extracellular signal–regulated kinases (ERK) and blocking cell proliferation22. Ras is the representative protein of the small GTPase superfamily that includes more than 150 proteins separated into five families: Ras, Rho, Rab, Arf, and Ran23. These small GTPases control various cell processes by alternating conformational states finely regulated by guanine-nucleotide-exchange factors (GEFs), which promote formation of the GTP- bound active state, and by GTPase-activating proteins (GAPs), which accelerate the intrinsic GTPase activity to promote formation of the GDP-bound inactive state23–25. In particular, the conformation of the Switch I region (residues 30–38 in Ras) in the GTP-bound state is essential for binding of effectors and activation of downstream signaling cascades26–28. DUF5 was found to cleave Ras between Y32 and D33 within the Switch I region22. Biochemistry. Author manuscript; available in PMC 2018 May 30. Biancucci et al. Page 3 There are three human RAS genes (NRas, HRas and KRas) that encode four Ras proteins: Author ManuscriptAuthor Manuscript Author Manuscript Author Manuscript Author NRas, HRas, and two isoforms of KRas, of which KRas4B is the predominant splice variant expressed in many tissues 29. The primary sequence of the four Ras proteins is highly conserved (85–87% amino acid sequence identity) and they share many structural and biochemical properties. The N-terminal G domain (residues 5–166) is involved in the nucleotide binding and GTP hydrolysis including the highly conserved Switch I region (Fig. 2). The hypervariable regions (HVRs) at the C-termini are subject to different post- translational modifications that direct Ras isoforms to different subcellular locations23, 30. In our previous study, we found that DUF5 cleaves full-length KRas, NRas and HRas equally well, demonstrating that the different C-terminal HVRs among Ras isoforms are not involved in substrate recognition by the endopeptidase22. The Ras subfamily, in addition to KRas, HRas, and NRas, includes other similar GTPases like Ras-related proteins 1 and 2 (Rap1 and Rap2), as well as Ral, Rheb, and Rit proteins. These other subfamily members regulate many cellular functions including cell proliferation, differentiation and survival, cell adhesion, mTOR signaling, and neuronal differentiation31–34. Among several small GTPases tested belonging to this Ras subfamily, DUF5 was found to efficiently cleave only Rap1 in addition to Ras22, and did not cleave RalA, RheB2, or Rit222. The endopeptidase also did not cleave GTPases from other small GTPase subfamilies, including RhoA, which regulates cytoskeleton assembly. Since DUF5 exclusively cleaves the small GTPases Ras and Rap1, this effector domain was renamed Ras/ Rap1-specific endopeptidase (RRSP). Ras itself is the central node in the cell that coordinates extracellular signals to ultimately regulate expression of genes for cell proliferation, differentiation, and survival through its control of the MAPK signaling cascade35. Rap1 mainly controls establishment of cell polarity, activation of integrin-mediated cell adhesion and the regulation of cell–cell contacts31, 36, 37. Interestingly, both Ras and Rap1 control signal
Load more

Recommended publications
  • Anti-Rab11 Antibody (ARG41900)
    Product datasheet [email protected] ARG41900 Package: 100 μg anti-Rab11 antibody Store at: -20°C Summary Product Description Goat Polyclonal antibody recognizes Rab11 Tested Reactivity Hu, Ms, Rat, Dog, Mk Tested Application IHC-Fr, IHC-P, WB Host Goat Clonality Polyclonal Isotype IgG Target Name Rab11 Antigen Species Mouse Immunogen Purified recombinant peptides within aa. 110 to the C-terminus of Mouse Rab11a, Rab11b and Rab11c (Rab25). Conjugation Un-conjugated Alternate Names RAB11A: Rab-11; Ras-related protein Rab-11A; YL8 RAB11B: GTP-binding protein YPT3; H-YPT3; Ras-related protein Rab-11B RAB25: RAB11C; CATX-8; Ras-related protein Rab-25 Application Instructions Application table Application Dilution IHC-Fr 1:100 - 1:400 IHC-P 1:100 - 1:400 WB 1:250 - 1:2000 Application Note IHC-P: Antigen Retrieval: Heat mediation was recommended. * The dilutions indicate recommended starting dilutions and the optimal dilutions or concentrations should be determined by the scientist. Positive Control Hepa cell lysate Calculated Mw 24 kDa Observed Size ~ 26 kDa Properties Form Liquid Purification Affinity purification with immunogen. Buffer PBS, 0.05% Sodium azide and 20% Glycerol. Preservative 0.05% Sodium azide www.arigobio.com 1/3 Stabilizer 20% Glycerol Concentration 3 mg/ml Storage instruction For continuous use, store undiluted antibody at 2-8°C for up to a week. For long-term storage, aliquot and store at -20°C. Storage in frost free freezers is not recommended. Avoid repeated freeze/thaw cycles. Suggest spin the vial prior to opening. The antibody solution should be gently mixed before use. Note For laboratory research only, not for drug, diagnostic or other use.
    [Show full text]
  • The Rac Gtpase in Cancer: from Old Concepts to New Paradigms Marcelo G
    Published OnlineFirst August 14, 2017; DOI: 10.1158/0008-5472.CAN-17-1456 Cancer Review Research The Rac GTPase in Cancer: From Old Concepts to New Paradigms Marcelo G. Kazanietz1 and Maria J. Caloca2 Abstract Rho family GTPases are critical regulators of cellular func- mislocalization of Rac signaling components. The unexpected tions that play important roles in cancer progression. Aberrant pro-oncogenic functions of Rac GTPase-activating proteins also activity of Rho small G-proteins, particularly Rac1 and their challenged the dogma that these negative Rac regulators solely regulators, is a hallmark of cancer and contributes to the act as tumor suppressors. The potential contribution of Rac tumorigenic and metastatic phenotypes of cancer cells. This hyperactivation to resistance to anticancer agents, including review examines the multiple mechanisms leading to Rac1 targeted therapies, as well as to the suppression of antitumor hyperactivation, particularly focusing on emerging paradigms immune response, highlights the critical need to develop ther- that involve gain-of-function mutations in Rac and guanine apeutic strategies to target the Rac pathway in a clinical setting. nucleotide exchange factors, defects in Rac1 degradation, and Cancer Res; 77(20); 5445–51. Ó2017 AACR. Introduction directed toward targeting Rho-regulated pathways for battling cancer. Exactly 25 years ago, two seminal papers by Alan Hall and Nearly all Rho GTPases act as molecular switches that cycle colleagues illuminated us with one of the most influential dis- between GDP-bound (inactive) and GTP-bound (active) forms. coveries in cancer signaling: the association of Ras-related small Activation is promoted by guanine nucleotide exchange factors GTPases of the Rho family with actin cytoskeleton reorganization (GEF) responsible for GDP dissociation, a process that normally (1, 2).
    [Show full text]
  • Protein Prenylation Reactions As Tools for Site-Specific Protein Labeling and Identification of Prenylation Substrates
    Protein prenylation reactions as tools for site-specific protein labeling and identification of prenylation substrates Dissertation zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften (Dr. rer. nat.) des Fachbereichs Chemie der Technischen Universität Dortmund Angefertigt am Max-Planck-Institut für molekulare Physiologie in Dortmund Vorgelegt von Dipl.-Chemikerin Thi Thanh Uyen Nguyen aus Jülich Dortmund, April 2009 Die vorliegende Arbeit wurde in der Zeit von Oktober 2005 bis April 2009 am Max-Planck- Institut für molekulare Physiologie in Dortmund unter der Anleitung von Prof. Dr. Roger S. Goody, Prof. Dr. Kirill Alexandrov und Prof. Dr. Herbert Waldmann durchgeführt. 1. Gutachter : Prof. Dr. R. S. Goody 2. Gutachter : Prof. Dr. H. Waldmann The results of this work were published in the following journals: “Exploiting the substrate tolerance of farnesyltransferase for site-selective protein derivatization” U.T.T. Nguyen, J. Cramer, J. Gomis, R. Reents, M. Gutierrez-Rodriguez, R.S. Goody, K. Alexandrov, H. Waldmann, Chembiochem 2007, 8 (4), 408-23. “Development of selective RabGGTase inhibitors and crystal structure of a RabGGTase- inhibitor complex” Z. Guo, Y.W. Wu, K.T. Tan, R.S. Bon, E. Guiu-Rozas, C. Delon, U.T.T. Nguyen, S. Wetzel,S. Arndt, R.S. Goody, W. Blankenfeldt, K. Alexandrov, H. Waldmann, Angew Chem Int Ed Engl 2008, 47 (20), 3747-50. “Analysis of the eukaryotic prenylome by isoprenoid affinity tagging” U.T.T. Nguyen, Z. Guo, C. Delon, Y.W. Wu, C. Deraeve, B. Franzel, R.S. Bon, W. Blankenfeldt, R.S. Goody, H. Waldmann, D. Wolters, K. Alexandrov, Nat Chem Biol 2009, 5 (4), 227-35.
    [Show full text]
  • A GTP-State Specific Cyclic Peptide Inhibitor of the Gtpase Gαs
    bioRxiv preprint doi: https://doi.org/10.1101/2020.04.25.054080; this version posted April 27, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. A GTP-state specific cyclic peptide inhibitor of the GTPase Gαs Shizhong A. Dai1,2†, Qi Hu1,2†, Rong Gao3†, Andre Lazar1,4†, Ziyang Zhang1,2, Mark von Zastrow1,4, Hiroaki Suga3*, Kevan M. Shokat1,2* 5 1Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA, 94158, USA 2Howard Hughes Medical Institute 3Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 10 4Department of Psychiatry, University of California, San Francisco, San Francisco, CA, 94158, USA *Correspondence to: [email protected], [email protected] †These authors contributed equally. 15 20 1 bioRxiv preprint doi: https://doi.org/10.1101/2020.04.25.054080; this version posted April 27, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. Abstract: The G protein-coupled receptor (GPCR) cascade leading to production of the second messenger cAMP is replete with pharmacologically targetable receptors and enzymes with the exception of the stimulatory G protein α subunit, Gαs.
    [Show full text]
  • Involvement of the Rho/Rac Family Member Rhog in Caveolar Endocytosis
    Oncogene (2006) 25, 2961–2973 & 2006 Nature Publishing Group All rights reserved 0950-9232/06 $30.00 www.nature.com/onc ORIGINAL ARTICLE Involvement of the Rho/Rac family member RhoG in caveolar endocytosis RM Prieto-Sa´ nchez1, IM Berenjeno1 and XR Bustelo Centro de Investigacio´n del Ca´ncer, Instituto de Biologı´a Molecular y Celular del Ca´ncer (IBMCC), and Red Tema´tica Cooperativa de Centros de Ca´ncer, CSIC-University of Salamanca, Campus Unamuno, Salamanca, Spain We show here that the GTPase RhoG is involved in transduction, cell polarity, and intercellular communi- caveolar trafficking. Wild-type RhoG moves sequentially cations (Gruenberg, 2001; Conner and Schmid, 2003; Di to the plasma membrane, intracellular vesicles, and the Guglielmo et al., 2003; Felberbaum-Corti et al., 2003; Golgi apparatus along markers of this endocytic pathway. Gonzalez-Gaitan, 2003). The best-known endocytic Such translocation is associated with changes in RhoG pathway is that composed of clathrin-coated vesicles GDP/GTP levels and is highly dependent on lipid raft (Zerial and McBride, 2001; Conner and Schmid, 2003). integrity and on the function of the GTPase dynamin2. In In this case, we have information regarding the addition, the constitutively active RhoGQ61L mutant is internalization, sorting, recycling, fusion, and delivery preferentially located in endocytic vesicles that can be events that participate in this type of endocytosis (Zerial decorated with markers of the caveola-derived endocytic and McBride, 2001; Conner and Schmid, 2003). This pathway. RhoGQ61L, but not the analogous Rac1 mutant pathway has also been molecularly dissected, resulting protein, affects caveola internalization and the subsequent in the characterization of a large number of regulatory delivery of endocytic vesicles to the Golgi apparatus.
    [Show full text]
  • Clinical Utility of Recently Identified Diagnostic, Prognostic, And
    Modern Pathology (2017) 30, 1338–1366 1338 © 2017 USCAP, Inc All rights reserved 0893-3952/17 $32.00 Clinical utility of recently identified diagnostic, prognostic, and predictive molecular biomarkers in mature B-cell neoplasms Arantza Onaindia1, L Jeffrey Medeiros2 and Keyur P Patel2 1Instituto de Investigacion Marques de Valdecilla (IDIVAL)/Hospital Universitario Marques de Valdecilla, Santander, Spain and 2Department of Hematopathology, MD Anderson Cancer Center, Houston, TX, USA Genomic profiling studies have provided new insights into the pathogenesis of mature B-cell neoplasms and have identified markers with prognostic impact. Recurrent mutations in tumor-suppressor genes (TP53, BIRC3, ATM), and common signaling pathways, such as the B-cell receptor (CD79A, CD79B, CARD11, TCF3, ID3), Toll- like receptor (MYD88), NOTCH (NOTCH1/2), nuclear factor-κB, and mitogen activated kinase signaling, have been identified in B-cell neoplasms. Chronic lymphocytic leukemia/small lymphocytic lymphoma, diffuse large B-cell lymphoma, follicular lymphoma, mantle cell lymphoma, Burkitt lymphoma, Waldenström macroglobulinemia, hairy cell leukemia, and marginal zone lymphomas of splenic, nodal, and extranodal types represent examples of B-cell neoplasms in which novel molecular biomarkers have been discovered in recent years. In addition, ongoing retrospective correlative and prospective outcome studies have resulted in an enhanced understanding of the clinical utility of novel biomarkers. This progress is reflected in the 2016 update of the World Health Organization classification of lymphoid neoplasms, which lists as many as 41 mature B-cell neoplasms (including provisional categories). Consequently, molecular genetic studies are increasingly being applied for the clinical workup of many of these neoplasms. In this review, we focus on the diagnostic, prognostic, and/or therapeutic utility of molecular biomarkers in mature B-cell neoplasms.
    [Show full text]
  • Yeast Genome Gazetteer P35-65
    gazetteer Metabolism 35 tRNA modification mitochondrial transport amino-acid metabolism other tRNA-transcription activities vesicular transport (Golgi network, etc.) nitrogen and sulphur metabolism mRNA synthesis peroxisomal transport nucleotide metabolism mRNA processing (splicing) vacuolar transport phosphate metabolism mRNA processing (5’-end, 3’-end processing extracellular transport carbohydrate metabolism and mRNA degradation) cellular import lipid, fatty-acid and sterol metabolism other mRNA-transcription activities other intracellular-transport activities biosynthesis of vitamins, cofactors and RNA transport prosthetic groups other transcription activities Cellular organization and biogenesis 54 ionic homeostasis organization and biogenesis of cell wall and Protein synthesis 48 plasma membrane Energy 40 ribosomal proteins organization and biogenesis of glycolysis translation (initiation,elongation and cytoskeleton gluconeogenesis termination) organization and biogenesis of endoplasmic pentose-phosphate pathway translational control reticulum and Golgi tricarboxylic-acid pathway tRNA synthetases organization and biogenesis of chromosome respiration other protein-synthesis activities structure fermentation mitochondrial organization and biogenesis metabolism of energy reserves (glycogen Protein destination 49 peroxisomal organization and biogenesis and trehalose) protein folding and stabilization endosomal organization and biogenesis other energy-generation activities protein targeting, sorting and translocation vacuolar and lysosomal
    [Show full text]
  • Tumor Markers
    Tumor Markers Alan H.B. Wu, Ph.D. Professor, Laboratory Medicine, UCSF Section Chief, Clinical Chemistry, Toxicology, Pharmacogenomics Laboratory, SFGH Learning objectives • Know the ideal characteristics of a tumor marker • Understand the role of tumor markers for diagnosis and management of patients with cancer. • Know the emerging technologies for tumor markers • Understand the role of tumor markers for therapeutic selection How do we diagnose cancer today? Physical Examination Blood tests CT scans Biopsy Human Prostate Cancer Normal Blood Smear Chronic Myeloid Leukemia Death rates for cancer vs. heart disease New cancer cases per year Cancer Site or Type New Cases Prostate 218,000 Lung 222,500 Breast 207,500 Colorectal 149,000 Urinary system 131,500 Skin 68,770 Pancreas 43,100 Ovarian 22,000 Myeloma 20,200 Thyroid 44,700 Germ Cell 9,000 Types of Tumor Markers • Hormones (hCG; calcitonin; gastrin; prolactin;) • Enzymes (acid phosphatase; alkaline phosphatase; PSA) • Cancer antigen proteins & glycoproteins (CA125; CA 15.3; CA19.9) • Metabolites (norepinephrine, epinephrine) • Normal proteins (thyroglobulin) • Oncofetal antigens (CEA, AFP) • Receptors (ER, PR, EGFR) • Genetic changes (mutations/translocations, etc.) Characteristics of an ideal tumor marker • Specificity for a single type of cancer • High sensitivity and specificity for cancerous growth • Correlation of marker level with tumor size • Homogeneous (i.e., minimal post-translational modifications) • Short half-life in circulation Roles for tumor markers • Determine risk (PSA)
    [Show full text]
  • A Rhog-Mediated Signaling Pathway That Modulates Invadopodia Dynamics in Breast Cancer Cells Silvia M
    © 2017. Published by The Company of Biologists Ltd | Journal of Cell Science (2017) 130, 1064-1077 doi:10.1242/jcs.195552 RESEARCH ARTICLE A RhoG-mediated signaling pathway that modulates invadopodia dynamics in breast cancer cells Silvia M. Goicoechea, Ashtyn Zinn, Sahezeel S. Awadia, Kyle Snyder and Rafael Garcia-Mata* ABSTRACT micropinocytosis, bacterial uptake, phagocytosis and leukocyte One of the hallmarks of cancer is the ability of tumor cells to invade trans-endothelial migration (deBakker et al., 2004; Ellerbroek et al., surrounding tissues and metastasize. During metastasis, cancer cells 2004; Jackson et al., 2015; Katoh et al., 2006, 2000; van Buul et al., degrade the extracellular matrix, which acts as a physical barrier, by 2007). Recent studies have revealed that RhoG plays a role in tumor developing specialized actin-rich membrane protrusion structures cell invasion and may contribute to the formation of invadopodia called invadopodia. The formation of invadopodia is regulated by Rho (Hiramoto-Yamaki et al., 2010; Kwiatkowska et al., 2012). GTPases, a family of proteins that regulates the actin cytoskeleton. Invadopodia are actin-rich adhesive structures that form in the Here, we describe a novel role for RhoG in the regulation of ventral surface of cancer cells and allow them to degrade the invadopodia disassembly in human breast cancer cells. Our results extracellular matrix (ECM) (Gimona et al., 2008). Formation of show that RhoG and Rac1 have independent and opposite roles invadopodia involves a series of steps that include the disassembly in the regulation of invadopodia dynamics. We also show that SGEF of focal adhesions and stress fibers, and the relocalization of several (also known as ARHGEF26) is the exchange factor responsible of their components into the newly formed invadopodia (Hoshino for the activation of RhoG during invadopodia disassembly.
    [Show full text]
  • Supplementary Materials
    Supplementary Materials COMPARATIVE ANALYSIS OF THE TRANSCRIPTOME, PROTEOME AND miRNA PROFILE OF KUPFFER CELLS AND MONOCYTES Andrey Elchaninov1,3*, Anastasiya Lokhonina1,3, Maria Nikitina2, Polina Vishnyakova1,3, Andrey Makarov1, Irina Arutyunyan1, Anastasiya Poltavets1, Evgeniya Kananykhina2, Sergey Kovalchuk4, Evgeny Karpulevich5,6, Galina Bolshakova2, Gennady Sukhikh1, Timur Fatkhudinov2,3 1 Laboratory of Regenerative Medicine, National Medical Research Center for Obstetrics, Gynecology and Perinatology Named after Academician V.I. Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia 2 Laboratory of Growth and Development, Scientific Research Institute of Human Morphology, Moscow, Russia 3 Histology Department, Medical Institute, Peoples' Friendship University of Russia, Moscow, Russia 4 Laboratory of Bioinformatic methods for Combinatorial Chemistry and Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow, Russia 5 Information Systems Department, Ivannikov Institute for System Programming of the Russian Academy of Sciences, Moscow, Russia 6 Genome Engineering Laboratory, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia Figure S1. Flow cytometry analysis of unsorted blood sample. Representative forward, side scattering and histogram are shown. The proportions of negative cells were determined in relation to the isotype controls. The percentages of positive cells are indicated. The blue curve corresponds to the isotype control. Figure S2. Flow cytometry analysis of unsorted liver stromal cells. Representative forward, side scattering and histogram are shown. The proportions of negative cells were determined in relation to the isotype controls. The percentages of positive cells are indicated. The blue curve corresponds to the isotype control. Figure S3. MiRNAs expression analysis in monocytes and Kupffer cells. Full-length of heatmaps are presented.
    [Show full text]
  • A Chemical Proteomic Approach to Investigate Rab Prenylation in Living Systems
    A chemical proteomic approach to investigate Rab prenylation in living systems By Alexandra Fay Helen Berry A thesis submitted to Imperial College London in candidature for the degree of Doctor of Philosophy of Imperial College. Department of Chemistry Imperial College London Exhibition Road London SW7 2AZ August 2012 Declaration of Originality I, Alexandra Fay Helen Berry, hereby declare that this thesis, and all the work presented in it, is my own and that it has been generated by me as the result of my own original research, unless otherwise stated. 2 Abstract Protein prenylation is an important post-translational modification that occurs in all eukaryotes; defects in the prenylation machinery can lead to toxicity or pathogenesis. Prenylation is the modification of a protein with a farnesyl or geranylgeranyl isoprenoid, and it facilitates protein- membrane and protein-protein interactions. Proteins of the Ras superfamily of small GTPases are almost all prenylated and of these the Rab family of proteins forms the largest group. Rab proteins are geranylgeranylated with up to two geranylgeranyl groups by the enzyme Rab geranylgeranyltransferase (RGGT). Prenylation of Rabs allows them to locate to the correct intracellular membranes and carry out their roles in vesicle trafficking. Traditional methods for probing prenylation involve the use of tritiated geranylgeranyl pyrophosphate which is hazardous, has lengthy detection times, and is insufficiently sensitive. The work described in this thesis developed systems for labelling Rabs and other geranylgeranylated proteins using a technique known as tagging-by-substrate, enabling rapid analysis of defective Rab prenylation in cells and tissues. An azide analogue of the geranylgeranyl pyrophosphate substrate of RGGT (AzGGpp) was applied for in vitro prenylation of Rabs by recombinant enzyme.
    [Show full text]
  • Rap1 Acts Via Multiple Mechanisms to Position Canoe/Afadin and Adherens Junctions and Mediate Apical-Basal Polarity Establishment
    bioRxiv preprint doi: https://doi.org/10.1101/170977; this version posted July 31, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Rap1 acts via multiple mechanisms to position Canoe/Afadin and adherens junctions and mediate apical-basal polarity establishment Teresa T. Bonello1, Kia Z. Perez-Vale2, Kaelyn D. Sumigray3, and Mark Peifer1,2,3* 1 Department of Biology, University of North Carolina at Chapel Hill, CB#3280, Chapel Hill, NC 27599-3280, USA 2 Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA 3 Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA Running Title Active Rap1 positions Canoe and AJs 6950 words * To whom correspondence should be addressed Email: [email protected] Phone: (919) 962-2272 Abbreviations used: α-cat, alpha-catenin; β-cat, beta-catenin; AJ, adherens junction; Arm, Armadillo; Baz, BazooKa; CA, constitutively active; Cno, Canoe; DE-cad, Drosophila E-cadherin; Dzy, Dizzy; GAP, GTPase activating protein; GDP, guanosine diphosphate; GEF, guanine nucleotide exchange factor; GFP, green fluorescent protein; GTP, guanosine triphosphate; IF, immunofluorescence; MIP, maximum intensity projection; RA, Ras-associated; RFP, red fluorescent protein; SAJ, spot adherens junction; shRNA, short hairpin RNA; TCJ, tricellular junction; WT, wildtype 1 bioRxiv preprint doi: https://doi.org/10.1101/170977; this version posted July 31, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved.
    [Show full text]