Single Molecule Protein Detection for Proteomic Profiling Simon Leclerc
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Western Blotting Guidebook
Western Blotting Guidebook Substrate Substrate Secondary Secondary Antibody Antibody Primary Primary Antibody Antibody Protein A Protein B 1 About Azure Biosystems At Azure Biosystems, we develop easy-to-use, high-performance imaging systems and high-quality reagents for life science research. By bringing a fresh approach to instrument design, technology, and user interface, we move past incremental improvements and go straight to innovations that substantially advance what a scientist can do. And in focusing on getting the highest quality data from these instruments—low backgrounds, sensitive detection, robust quantitation—we’ve created a line of reagents that consistently delivers reproducible results and streamlines workflows. Providing scientists around the globe with high-caliber products for life science research, Azure Biosystems’ innovations open the door to boundless scientific insights. Learn more at azurebiosystems.com. cSeries Imagers Sapphire Ao Absorbance Reagents & Biomolecular Imager Microplate Reader Blotting Accessories Corporate Headquarters 6747 Sierra Court Phone: (925) 307-7127 Please send purchase orders to: Suite A-B (9am–4pm Pacific time) [email protected] Dublin, CA 94568 To dial from outside of the US: For product inquiries, please email USA +1 925 307 7127 [email protected] FAX: (925) 905-1816 www.azurebiosystems.com • [email protected] Copyright © 2018 Azure Biosystems. All rights reserved. The Azure Biosystems logo, Azure Biosystems™, cSeries™, Sapphire™ and Radiance™ are trademarks of Azure Biosystems, Inc. More information about Azure Biosystems intellectual property assets, including patents, trademarks and copyrights, is available at www.azurebiosystems.com or by contacting us by phone or email. All other trademarks are property of their respective owners. -
Molecular Biologist's Guide to Proteomics
Molecular Biologist's Guide to Proteomics Paul R. Graves and Timothy A. J. Haystead Microbiol. Mol. Biol. Rev. 2002, 66(1):39. DOI: 10.1128/MMBR.66.1.39-63.2002. Downloaded from Updated information and services can be found at: http://mmbr.asm.org/content/66/1/39 These include: REFERENCES This article cites 172 articles, 34 of which can be accessed free http://mmbr.asm.org/ at: http://mmbr.asm.org/content/66/1/39#ref-list-1 CONTENT ALERTS Receive: RSS Feeds, eTOCs, free email alerts (when new articles cite this article), more» on November 20, 2014 by UNIV OF KENTUCKY Information about commercial reprint orders: http://journals.asm.org/site/misc/reprints.xhtml To subscribe to to another ASM Journal go to: http://journals.asm.org/site/subscriptions/ MICROBIOLOGY AND MOLECULAR BIOLOGY REVIEWS, Mar. 2002, p. 39–63 Vol. 66, No. 1 1092-2172/02/$04.00ϩ0 DOI: 10.1128/MMBR.66.1.39–63.2002 Copyright © 2002, American Society for Microbiology. All Rights Reserved. Molecular Biologist’s Guide to Proteomics Paul R. Graves1 and Timothy A. J. Haystead1,2* Department of Pharmacology and Cancer Biology, Duke University,1 and Serenex Inc.,2 Durham, North Carolina 27710 INTRODUCTION .........................................................................................................................................................40 Definitions..................................................................................................................................................................40 Downloaded from Proteomics Origins ...................................................................................................................................................40 -
Protein Blotting Guide
Electrophoresis and Blotting Protein Blotting Guide BEGIN Protein Blotting Guide Theory and Products Part 1 Theory and Products 5 Chapter 5 Detection and Imaging 29 Total Protein Detection 31 Transfer Buffer Formulations 58 5 Chapter 1 Overview of Protein Blotting Anionic Dyes 31 Towbin Buffer 58 Towbin Buffer with SDS 58 Transfer 6 Fluorescent Protein Stains 31 Stain-Free Technology 32 Bjerrum Schafer-Nielsen Buffer 58 Detection 6 Colloidal Gold 32 Bjerrum Schafer-Nielsen Buffer with SDS 58 CAPS Buffer 58 General Considerations and Workflow 6 Immunodetection 32 Dunn Carbonate Buffer 58 Immunodetection Workflow 33 0.7% Acetic Acid 58 Chapter 2 Methods and Instrumentation 9 Blocking 33 Protein Blotting Methods 10 Antibody Incubations 33 Detection Buffer Formulations 58 Electrophoretic Transfer 10 Washes 33 General Detection Buffers 58 Tank Blotting 10 Antibody Selection and Dilution 34 Total Protein Staining Buffers and Solutions 59 Semi-Dry Blotting 11 Primary Antibodies 34 Substrate Buffers and Solutions 60 Microfiltration (Dot Blotting) Species-Specific Secondary Antibodies 34 Stripping Buffer 60 Antibody-Specific Ligands 34 Blotting Systems and Power Supplies 12 Detection Methods 35 Tank Blotting Cells 12 Colorimetric Detection 36 Part 3 Troubleshooting 63 Mini Trans-Blot® Cell and Criterion™ Blotter 12 Premixed and Individual Colorimetric Substrates 38 Transfer 64 Trans-Blot® Cell 12 Immun-Blot® Assay Kits 38 Electrophoretic Transfer 64 Trans-Blot® Plus Cell 13 Immun-Blot Amplified AP Kit 38 Microfiltration 65 Semi-Dry Blotting Cells -
Western Blot Handbook
Novus-lu-2945 Western Blot Handbook Learn more | novusbio.com Learn more | novusbio.com INTRODUCTION TO WESTERN BLOTTING Western blotting uses antibodies to identify individual proteins within a cell or tissue lysate. Antibodies bind to highly specific sequences of amino acids, known as epitopes. Because amino acid sequences vary from protein to protein, western blotting analysis can be used to identify and quantify a single protein in a lysate that contains thousands of different proteins First, proteins are separated from each other based on their size by SDS-PAGE gel electrophoresis. Next, the proteins are transferred from the gel to a membrane by application of an electrical current. The membrane can then be processed with primary antibodies specific for target proteins of interest. Next, secondary antibodies bound to enzymes are applied and finally a substrate that reacts with the secondary antibody-bound enzyme is added for detection of the antibody/protein complex. This step-by-step guide is intended to serve as a starting point for understanding, performing, and troubleshooting a standard western blotting protocol. Learn more | novusbio.com Learn more | novusbio.com TABLE OF CONTENTS 1-2 Controls Positive control lysate Negative control lysate Endogenous control lysate Loading controls 3-6 Sample Preparation Lysis Protease and phosphatase inhibitors Carrying out lysis Example lysate preparation from cell culture protocol Determination of protein concentration Preparation of samples for gel loading Sample preparation protocol 7 -
Development and Applications of Superfolder and Split Fluorescent Protein Detection Systems in Biology
International Journal of Molecular Sciences Review Development and Applications of Superfolder and Split Fluorescent Protein Detection Systems in Biology Jean-Denis Pedelacq 1,* and Stéphanie Cabantous 2,* 1 Institut de Pharmacologie et de Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, 31077 Toulouse, France 2 Centre de Recherche en Cancérologie de Toulouse (CRCT), Inserm, Université Paul Sabatier-Toulouse III, CNRS, 31037 Toulouse, France * Correspondence: [email protected] (J.-D.P.); [email protected] (S.C.) Received: 15 June 2019; Accepted: 8 July 2019; Published: 15 July 2019 Abstract: Molecular engineering of the green fluorescent protein (GFP) into a robust and stable variant named Superfolder GFP (sfGFP) has revolutionized the field of biosensor development and the use of fluorescent markers in diverse area of biology. sfGFP-based self-associating bipartite split-FP systems have been widely exploited to monitor soluble expression in vitro, localization, and trafficking of proteins in cellulo. A more recent class of split-FP variants, named « tripartite » split-FP,that rely on the self-assembly of three GFP fragments, is particularly well suited for the detection of protein–protein interactions. In this review, we describe the different steps and evolutions that have led to the diversification of superfolder and split-FP reporter systems, and we report an update of their applications in various areas of biology, from structural biology to cell biology. Keywords: fluorescent protein; superfolder; split-GFP; bipartite; tripartite; folding; PPI 1. Superfolder Fluorescent Proteins: Progenitor of Split Fluorescent Protein (FP) Systems Previously described mutations that improve the physical properties and expression of green fluorescent protein (GFP) color variants in the host organism have already been the subject of several reviews [1–4] and will not be described here. -
Structural and Functional Studies on Photoactive Proteins and Proteins Involved in Cell Differentiation
Technische Universität München Fakultät für Organishe Chemie und Biochemie Max-Planck-Institut für Biochemie Abteilung Strukturforschung Biologische NMR-Arbeitsgruppe STRUCTURAL AND FUNCTIONAL STUDIES ON PHOTOACTIVE PROTEINS AND PROTEINS INVOLVED IN CELL DIFFERENTIATION Pawel Smialowski Vollständiger Abdruck der von der Fakultät für Chemie der Technischen Universität München zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften genehmigten Dissertation. Vorsitzender: Univ.-Prof. Dr. Dr. A. Bacher Prüfer der Dissertation: 1. apl. Prof. Dr. Dr. h.c. R. Huber 2. Univ.-Prof. Dr. W. Hiller Die Dissertation wurde am 10.02.2004 bei der Technischen Universität München eingereicht und durch die Fakultät für Chemie am 17.03.2004 angenommen. PUBLICATIONS Parts of this thesis have been or will be published in due course: Markus H. J. Seifert, Dorota Ksiazek, M. Kamran Azim, Pawel Smialowski, Nedilijko Budisa and Tad A. Holak Slow Exchange in the Chromophore of a Green Fluorescent Protein Variant J. Am. Chem. Soc. 2002, 124, 7932-7942. Markus H. J. Seifert, Julia Georgescu, Dorota Ksiazek, Pawel Smialowski, Till Rehm, Boris Steipe and Tad A. Holak Backbone Dynamics of Green Fluorescent Protein and the effect of Histidine 148 Substitution Biochemistry. 2003 Mar 11; 42(9): 2500-12. Pawel Smialowski, Mahavir Singh, Aleksandra Mikolajka, Narashimsha Nalabothula, Sudipta Majumdar, Tad A. Holak The human HLH proteins MyoD and Id–2 do not interact directly with either pRb or CDK6. FEBS Letters (submitted) 2004. ABBREVIATIONS ABBREVIATIONS -
The Proteasomal Deubiquitinating Enzyme PSMD14 Regulates Macroautophagy by Controlling Golgi-To-ER Retrograde Transport
cells Article The Proteasomal Deubiquitinating Enzyme PSMD14 Regulates Macroautophagy by Controlling Golgi-to-ER Retrograde Transport 1, 2 1, 3,4 Hianara A Bustamante y, Karina Cereceda , Alexis E González z, Guillermo E Valenzuela , Yorka Cheuquemilla 4, Sergio Hernández 2, Eloisa Arias-Muñoz 2, Cristóbal Cerda-Troncoso 2 , Susanne Bandau 5, Andrea Soza 2 , Gudrun Kausel 3 , Bredford Kerr 2, Gonzalo A Mardones 1,6, Jorge Cancino 2, Ronald T Hay 5, Alejandro Rojas-Fernandez 4,5,* and Patricia V Burgos 2,7,* 1 Instituto de Fisiología, Facultad de Medicina, Universidad Austral de Chile, Valdivia 5110566, Chile; [email protected] (H.A.B.); [email protected] (A.E.G.); [email protected] (G.A.M.) 2 Centro de Biología Celular y Biomedicina (CEBICEM), Facultad de Medicina y Ciencia, Universidad San Sebastián, Lota 2465, Santiago 7510157, Chile; [email protected] (K.C.); [email protected] (S.H.); [email protected] (E.A.-M.); [email protected] (C.C.-T.); [email protected] (A.S.); [email protected] (B.K.); [email protected] (J.C.) 3 Instituto de Bioquímica y Microbiología, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 5110566, Chile; [email protected] (G.E.V.); [email protected] (G.K.) 4 Instituto de Medicina & Centro Interdisciplinario de Estudios del Sistema Nervioso (CISNe), Universidad Austral de Chile, Valdivia 5110566, Chile; [email protected] 5 Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, DD1 4HN, Dundee DD1 4HN UK; [email protected] -
Cayman Issue Autophagy & the Ubiquitin-Proteasome Pathway
CAYMAN ISSUE AUTOPHAGY & THE UBIQUITIN-PROTEASOME PATHWAY IN THIS ISSUE: Recycling the Cell: Autophagy and the • Recycling the Ubiquitin-Proteasome Processes Cell: Autophagy and the by Paul Domanski Ubiquitin-Proteasome Processes In order for the cell to function normally, a balance must be maintained between the production, degradation, and clearance of cytoplasmic components. To accomplish this, the Pages 1-3 cell relies primarily on two methods: 1) the ubiquitin-proteasome pathway, in which proteins are selectively tagged by ubiquitin for degradation in the proteasome and 2) autophagy (‘self- • Autophagy Detection eating’), a general term used to describe all pathways that are used to deliver cytoplasmic Pages 4-5 components to the lysosome for degradation. While the ubiquitin-proteasome pathway is mainly used to degrade short-lived and abnormal proteins, autophagy is responsible for • Chemical Modulators elimination of cytoplasmic components, damaged organelles, and long-lived and aggregated proteins. This cellular ‘recycling’ system is tightly regulated so that degradation and of Autophagy regeneration of the cellular building blocks can proceed in an efficient manner. • Inducing Autophagy ° MTOR Pathway Inhibitors • Blocking Autophagy Ubiquitin Pages 6-7 Ubiquitination, one of the most common post-translational modifications (PTMs) in the cell, • Proteasome Proteolytic is the primary mechanism by which short-lived proteins are targeted for degradation and Activity clearance. It is a highly specific system in which ubiquitin, a small (76 amino acid) protein, Page 8 continue to page 2 • Ubiquitination & Distributed by: BIOMOL GmbH Web: www.biomol.de Toll-free in Germany: Waidmannstr. 35 Tel: 040-8532600 Tel: 0800-2466651 Deubiquitination 22769 Hamburg Fax: 040-85326022 Fax: 0800-2466652 Pages 9-10 Germany Email: [email protected] forms an amide bond with an epsilon amine of lysine in the target protein. -
Protein Detection & Identification Methods
Protein Detection & Identification Methods October 24, 2007 MSB B554 Hong Li [email protected] 973-972-8396 Lecture notes: http://njms.umdnj.edu/proweb/lectures/note2007fall01.pdf Objectives 1. Protein analysis to determine: • Purity, quantity and identity • Expression and localization • Post-translational modification • Induction and turnover 2. Principles behind the analytical techniques • Based on unique physical/chemical properties; size, charge, etc. • Assays are based on reactions producing light, color and radio activities for detection 3. Techniques • Electrophoresis • Immunoblotting • Autoradiography • Mass spectrometry • Proteomics 1 Purity, quantity and identity Post-translational modification Induction and turnover Expression localization Basic Principles for Analysis (How to differentiate one protein from another?) Structure (Drs. Wang & Wah) Amino acid composition Post-translational modification (Dr. Wagner) Size Polarity/Charge/Hydrophobicity Shape Affinity (binding to other proteins/molecules) Function: catalytic activities 2 Shapes and sizes # of amino acids, composition & sequences Charges and polarity 3 Charges and polarity from post-translational modifications Reactivities of amino acids Physical/chemical reactions to facilitate colorimetric detection Example: Protein concentration assays: Bradford, BCA, Lowry & Biuret, etc. http://www-class.unl.edu/biochem/protein_assay/ 4 Bradford assay (Bio-Rad) Based on a dye binding to basic and aromatic amino acids Coommassie Brilliant Blue (CBB) G250 Protein binding -
Global Subcellular Characterization of Protein Degradation Using Quantitative Proteomics*□S
Research Author’s Choice © 2013 by The American Society for Biochemistry and Molecular Biology, Inc. This paper is available on line at http://www.mcponline.org Global Subcellular Characterization of Protein Degradation Using Quantitative Proteomics*□S Mark Larance‡, Yasmeen Ahmad‡, Kathryn J. Kirkwood‡, Tony Ly‡, and Angus I. Lamond‡§¶ Protein degradation provides an important regulatory faster than the proteome average (3–5, 7). However, degra- mechanism used to control cell cycle progression and dation rates for individual proteins can change, for example many other cellular pathways. To comprehensively ana- depending on either the cell cycle stage, or signaling events, lyze the spatial control of protein degradation in U2OS and can also vary depending on subcellular localization. Dis- osteosarcoma cells, we have combined drug treatment ruption of such regulated protein stability underlies the dis- and SILAC-based quantitative mass spectrometry with ease mechanisms responsible for forms of cancer, e.g. p53 (9, subcellular and protein fractionation. The resulting data 10) and the proto-oncogene c-Myc (11). set analyzed more than 74,000 peptides, corresponding to Detection of rapidly degraded proteins can be difficult be- ϳ5000 proteins, from nuclear, cytosolic, membrane, and cytoskeletal compartments. These data identified rapidly cause of their low abundance. However, advances in mass degraded proteasome targets, such as PRR11 and high- spectrometry based proteomics have enabled in-depth quan- lighted a feedback mechanism resulting in translation in- titative analysis of cellular proteomes (12–14). Stable isotope hibition, induced by blocking the proteasome. We show labeling by amino acids in cell culture (SILAC)1 (15), has been this is mediated by activation of the unfolded protein widely used to measure protein properties such as abun- response. -
Sensitive Single Molecule Protein Quantification and Protein Complex
Proteomics 2011, 11, 4731–4735 DOI 10.1002/pmic.201100361 4731 TECHNICAL BRIEF Sensitive single-molecule protein quantification and protein complex detection in a microarray format Lee A. Tessler and Robi D. Mitra Department of Genetics, Center for Genome Sciences and Systems Biology, Washington University, St. Louis, MO, USA Single-molecule protein analysis provides sensitive protein quantitation with a digital read- Received: June 30, 2011 out and is promising for studying biological systems and detecting biomarkers clinically. Accepted: October 3, 2011 However, current single-molecule platforms rely on the quantification of one protein at a time. Conventional antibody microarrays are scalable to detect many proteins simultaneously, but they rely on less sensitive and less quantitative quantification by the ensemble averaging of fluorescent molecules. Here, we demonstrate a single-molecule protein assay in a microarray format enabled by an ultra-low background surface and single-molecule imaging. The digital read-out provides a highly sensitive, low femtomolar limit of detection and four orders of magnitude of dynamic range through the use of hybrid digital-analog quantifica- tion. From crude cell lysate, we measured levels of p53 and MDM2 in parallel, proving the concept of a digital antibody microarray for use in proteomic profiling. We also applied the single-molecule microarray to detect the p53–MDM2 protein complex in cell lysate. Our study is promising for development and application of single-molecule protein methods because it represents a technological bridge between single-plex and highly multiplex studies. Keywords: Antibody microarray / Sandwich immunoassay / Single-molecule detection / Technology / Total internal reflection fluorescence Single-molecule protein detection has the potential to cence (TIRF) imaging has provided a platform for single- benefit systems biology and biomarker studies by providing molecule quantification on planar surfaces. -
Quantum Dots Based Mesoporous Structured Imprinting Microspheres for the Sensitive Fluorescent Detection of Phycocyanin
Research Article www.acsami.org Quantum Dots Based Mesoporous Structured Imprinting Microspheres for the Sensitive Fluorescent Detection of Phycocyanin † § † † ‡ ‡ † Zhong Zhang, , Jinhua Li, Xiaoyan Wang, , Dazhong Shen, and Lingxin Chen*, † Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Provincial Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China ‡ Key Laboratory in Molecular and Nanomaterials Probes of the Ministry of Education of China, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China § University of Chinese Academy of Sciences, Beijing 100049, China *S Supporting Information ABSTRACT: Phycocyanin with important physiological/environmental sig- nificance has attracted increasing attention; versatile molecularly imprinted polymers (MIPs) have been applied to diverse species, but protein imprinting is still quite difficult. Herein, using phycocyanin as template via a sol−gel process, we developed a novel fluorescent probe for specific recognition and sensitive detection of phycocyanin by quantum dots (QDs) based mesoporous structured imprinting microspheres (SiO2@QDs@ms-MIPs), obeying elec- tron-transfer-induced fluorescence quenching mechanism. When phycocyanin was present, a Meisenheimer complex would be produced between phycocyanin and primary amino groups of QDs surface, and then the photoluminescent energy of QDs would be transferred to the complex, leading to the fluorescence fl quenching of QDs. As a result, the uorescent intensity of the SiO2@QDs@ms- MIPs was significantly decreased within 8 min, and accordingly a favorable linearity within 0.02−0.8 μM and a high detectability of 5.9 nM were presented. Excellent recognition specificity for phycocyanin over its analogues was displayed, with a high imprinting factor of 4.72.