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Schreiber KJ, Kadijk E, Youn JY. Exploring Options for Proximity-Dependent Biotinylation Experiments: Comparative Analysis of Labeling Enzymes and Affinity Purification Resins. J Proteome Res 2024; 23:1531-1543. [PMID: 38507741 PMCID: PMC11002925 DOI: 10.1021/acs.jproteome.3c00908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/05/2024] [Accepted: 03/07/2024] [Indexed: 03/22/2024]
Abstract
Proximity-dependent biotinylation (PDB) techniques provide information about the molecular neighborhood of a protein of interest, yielding insights into its function and localization. Here, we assessed how different labeling enzymes and streptavidin resins influence PDB results. We compared the high-confidence interactors of the DNA/RNA-binding protein transactive response DNA-binding protein 43 kDa (TDP-43) identified using either miniTurbo (biotin ligase) or APEX2 (peroxidase) enzymes. We also evaluated two commercial affinity resins for purification of biotinylated proteins: conventional streptavidin sepharose versus a new trypsin-resistant streptavidin conjugated to magnetic resin, which significantly reduces the level of contamination by streptavidin peptides following on-bead trypsin digestion. Downstream analyses involved liquid chromatography coupled to mass spectrometry in data-dependent acquisition mode, database searching, and statistical analysis of high-confidence interactors using SAINTexpress. The APEX2-TDP-43 experiment identified more interactors than miniTurbo-TDP-43, although miniTurbo provided greater overlap with previously documented TDP-43 interactors. Purifications on sepharose resin yielded more interactors than magnetic resin in small-scale experiments using a range of magnetic resin volumes. We suggest that resin-specific background protein binding profiles and different lysate-to-resin ratios cumulatively affect the distributions of prey protein abundance in experimental and control samples, which impact statistical confidence scores. Overall, we highlight key experimental variables to consider for the empirical optimization of PDB experiments.
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Affiliation(s)
- Karl J. Schreiber
- Program
in Molecular Medicine, The Hospital for
Sick Children, Toronto, ON M5G 0A4, Canada
| | - Eileigh Kadijk
- Program
in Molecular Medicine, The Hospital for
Sick Children, Toronto, ON M5G 0A4, Canada
| | - Ji-Young Youn
- Program
in Molecular Medicine, The Hospital for
Sick Children, Toronto, ON M5G 0A4, Canada
- Department
of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8, Canada
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2
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Régal L, Mårtensson E, Maystadt I, Voermans N, Lederer D, Burlina A, Juan Fita MJ, Hoogeboom AJM, Olsson Engman M, Hollemans T, Schouten M, Meulemans S, Jonson T, François I, Gil Ortega D, Kamsteeg EJ, Creemers JWM. PREPL deficiency: delineation of the phenotype and development of a functional blood assay. Genet Med 2017; 20:109-118. [PMID: 28726805 DOI: 10.1038/gim.2017.74] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 04/17/2017] [Indexed: 12/13/2022] Open
Abstract
PurposePREPL deficiency causes neonatal hypotonia, ptosis, neonatal feeding difficulties, childhood obesity, xerostomia, and growth hormone deficiency. Different recessive contiguous gene deletion syndromes involving PREPL and a variable combination of SLC3A1 (hypotonia-cystinuria syndrome), CAMKMT (atypical hypotonia-cystinuria syndrome), and PPM1B (2p21 deletion syndrome) have been described. In isolated PREPL deficiency, previously described only once, the absence of cystinuria complicates the diagnosis. Therefore, we developed a PREPL blood assay and further delineated the phenotype.MethodsClinical features of new subjects with PREPL deficiency were recorded. The presence of PREPL in lymphocytes and its reactivity with an activity-based probe were evaluated by western blot.ResultsFive subjects with isolated PREPL deficiency, three with hypotonia-cystinuria syndrome, and two with atypical hypotonia-cystinuria syndrome had nine novel alleles. Their IQs ranged from 64 to 112. Adult neuromuscular signs included ptosis, nasal dysarthria, facial weakness, and variable proximal and neck flexor weakness. Autonomic features are prevalent. PREPL protein and reactivity were absent in lymphocytes from subjects with PREPL deficiency, but normal in the clinically similar Prader-Willi syndrome.ConclusionPREPL deficiency causes neuromuscular, autonomic, cognitive, endocrine, and dysmorphic clinical features. PREPL is not deficient in Prader-Willi syndrome. The novel blood test should facilitate the confirmation of PREPL deficiency.
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Affiliation(s)
- Luc Régal
- Laboratory of Biochemical Neuroendocrinology, Department of Human Genetics, University of Leuven, Leuven, Belgium.,Pediatric Neurology and Metabolism, Department of Pediatrics, UZ Brussel, Brussels, Belgium
| | - Emma Mårtensson
- Department of Clinical Genetics, Region Skåne and Lund University, Lund, Sweden
| | - Isabelle Maystadt
- Centre de Génétique Humaine, Institut de Pathologie et Génétique, Charleroi, Belgium
| | - Nicol Voermans
- Department of Neurology, RadboudUMC Nijmegen, Nijmegen, The Netherlands
| | - Damien Lederer
- Centre de Génétique Humaine, Institut de Pathologie et Génétique, Charleroi, Belgium
| | - Alberto Burlina
- Division of Inherited Metabolic Diseases, Department of Pediatrics, University Hospital Padova, Padova, Italy
| | - María Jesús Juan Fita
- Unidad de Metabolopatías, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain
| | - A Jeannette M Hoogeboom
- Department of Clinical Genetics, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | | | - Tess Hollemans
- Pediatric Neurology and Metabolism, Department of Pediatrics, UZ Brussel, Brussels, Belgium
| | - Meyke Schouten
- Department of Clinical Genetics, RadboudUMC Nijmegen, Nijmegen, The Netherlands
| | - Sandra Meulemans
- Laboratory of Biochemical Neuroendocrinology, Department of Human Genetics, University of Leuven, Leuven, Belgium
| | - Tord Jonson
- Department of Clinical Genetics, Region Skåne and Lund University, Lund, Sweden
| | - Inge François
- Department of Pediatric Endocrinology, UZ Leuven, Leuven, Belgium
| | - David Gil Ortega
- Unidad de Metabolopatías, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain
| | - Erik-Jan Kamsteeg
- Department of Clinical Genetics, RadboudUMC Nijmegen, Nijmegen, The Netherlands
| | - John W M Creemers
- Laboratory of Biochemical Neuroendocrinology, Department of Human Genetics, University of Leuven, Leuven, Belgium
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3
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López-Soop G, Rønningen T, Rogala A, Richartz N, Blomhoff HK, Thiede B, Collas P, Küntziger T. AKAP95 interacts with nucleoporin TPR in mitosis and is important for the spindle assembly checkpoint. Cell Cycle 2017; 16:947-956. [PMID: 28379780 DOI: 10.1080/15384101.2017.1310350] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Faithful chromosome segregation during mitosis relies on a proofreading mechanism that monitors proper kinetochore-microtubule attachments. The spindle assembly checkpoint (SAC) is based on the concerted action of numerous components that maintain a repressive signal inhibiting transition into anaphase until all chromosomes are attached. Here we show that A-Kinase Anchoring Protein 95 (AKAP95) is necessary for proper SAC function. AKAP95-depleted HeLa cells show micronuclei formed from lagging chromosomes at mitosis. Using a BioID proximity-based proteomic screen, we identify the nuclear pore complex protein TPR as a novel AKAP95 binding partner. We show interaction between AKAP95 and TPR in mitosis, and an AKAP95-dependent enrichment of TPR in the spindle microtubule area in metaphase, then later in the spindle midzone area. AKAP95-depleted cells display faster prometaphase to anaphase transition, escape from nocodazole-induced mitotic arrest and show a partial delocalization from kinetochores of the SAC component MAD1. Our results demonstrate an involvement of AKAP95 in proper SAC function likely through its interaction with TPR.
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Affiliation(s)
- Graciela López-Soop
- a Department of Molecular Medicine, Faculty of Medicine , University of Oslo , Oslo , Norway.,b Norwegian Center for Stem Cell Research, Oslo University Hospital , Oslo , Norway
| | - Torunn Rønningen
- a Department of Molecular Medicine, Faculty of Medicine , University of Oslo , Oslo , Norway.,b Norwegian Center for Stem Cell Research, Oslo University Hospital , Oslo , Norway
| | - Agnieszka Rogala
- c Department of Oral Biology, Faculty of Dentistry , University of Oslo , Oslo , Norway
| | - Nina Richartz
- a Department of Molecular Medicine, Faculty of Medicine , University of Oslo , Oslo , Norway
| | - Heidi Kiil Blomhoff
- a Department of Molecular Medicine, Faculty of Medicine , University of Oslo , Oslo , Norway
| | - Bernd Thiede
- d Department of Biosciences, Faculty of Mathematics and Natural Sciences , University of Oslo , Oslo , Norway
| | - Philippe Collas
- a Department of Molecular Medicine, Faculty of Medicine , University of Oslo , Oslo , Norway.,b Norwegian Center for Stem Cell Research, Oslo University Hospital , Oslo , Norway
| | - Thomas Küntziger
- c Department of Oral Biology, Faculty of Dentistry , University of Oslo , Oslo , Norway
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4
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Krager KJ, Sarkar M, Twait EC, Lill NL, Koland JG. A novel biotinylated lipid raft reporter for electron microscopic imaging of plasma membrane microdomains. J Lipid Res 2012; 53:2214-2225. [PMID: 22822037 DOI: 10.1194/jlr.d026468] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The submicroscopic spatial organization of cell surface receptors and plasma membrane signaling molecules is readily characterized by electron microscopy (EM) via immunogold labeling of plasma membrane sheets. Although various signaling molecules have been seen to segregate within plasma membrane microdomains, the biochemical identity of these microdomains and the factors affecting their formation are largely unknown. Lipid rafts are envisioned as submicron membrane subdomains of liquid ordered structure with differing lipid and protein constituents that define their specific varieties. To facilitate EM investigation of inner leaflet lipid rafts and the localization of membrane proteins therein, a unique genetically encoded reporter with the dually acylated raft-targeting motif of the Lck kinase was developed. This reporter, designated Lck-BAP-GFP, incorporates green fluorescent protein (GFP) and biotin acceptor peptide (BAP) modules, with the latter allowing its single-step labeling with streptavidin-gold. Lck-BAP-GFP was metabolically biotinylated in mammalian cells, distributed into low-density detergent-resistant membrane fractions, and was readily detected with avidin-based reagents. In EM images of plasma membrane sheets, the streptavidin-gold-labeled reporter was clustered in 20-50 nm microdomains, presumably representative of inner leaflet lipid rafts. The utility of the reporter was demonstrated in an investigation of the potential lipid raft localization of the epidermal growth factor receptor.
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Affiliation(s)
- Kimberly J Krager
- Department of Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AK 72205; and
| | - Mitul Sarkar
- Department of Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Erik C Twait
- Department of Surgery, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Nancy L Lill
- Department of Pathology and the OSU Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210
| | - John G Koland
- Department of Pharmacology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.
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5
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Niers JM, Chen JW, Lewandrowski G, Kerami M, Garanger E, Wojtkiewicz G, Waterman P, Keliher E, Weissleder R, Tannous BA. Single reporter for targeted multimodal in vivo imaging. J Am Chem Soc 2012; 134:5149-56. [PMID: 22397453 PMCID: PMC3310895 DOI: 10.1021/ja209868g] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We have developed a multifaceted, highly specific reporter for multimodal in vivo imaging and applied it for detection of brain tumors. A metabolically biotinylated, membrane-bound form of Gaussia luciferase was synthesized, termed mbGluc-biotin. We engineered glioma cells to express this reporter and showed that brain tumor formation can be temporally imaged by bioluminescence following systemic administration of coelenterazine. Brain tumors expressing this reporter had high sensitivity for detection by magnetic resonance and fluorescence tomographic imaging upon injection of streptavidin conjugated to magnetic nanoparticles or fluorophore, respectively. Moreover, single photon emission computed tomography showed enhanced imaging of these tumors upon injection with streptavidin complexed to (111)In-DTPA-biotin. This work shows for the first time a single small reporter (∼40 kDa) which can be monitored with most available molecular imaging modalities and can be extended for single cell imaging using intravital microscopy, allowing real-time tracking of any cell expressing it in vivo.
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Affiliation(s)
- Johanna M Niers
- Experimental Therapeutics and Molecular Imaging Laboratory, Neuroscience Center, Department of Neurology, Massachusetts General Hospital, Boston, USA
- Neuro-oncology Research Group, Department of Neurosurgery, VU Medical Center, Cancer Center Amsterdam, 1007 MB Amsterdam, The Netherlands
| | - John W Chen
- Center for Systems Biology, Massachusetts General Hospital, Boston, USA
- Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Boston, USA
| | - Grant Lewandrowski
- Experimental Therapeutics and Molecular Imaging Laboratory, Neuroscience Center, Department of Neurology, Massachusetts General Hospital, Boston, USA
| | - Mariam Kerami
- Experimental Therapeutics and Molecular Imaging Laboratory, Neuroscience Center, Department of Neurology, Massachusetts General Hospital, Boston, USA
- Neuro-oncology Research Group, Department of Neurosurgery, VU Medical Center, Cancer Center Amsterdam, 1007 MB Amsterdam, The Netherlands
| | | | - Greg Wojtkiewicz
- Center for Systems Biology, Massachusetts General Hospital, Boston, USA
- Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Boston, USA
| | - Peter Waterman
- Center for Systems Biology, Massachusetts General Hospital, Boston, USA
- Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Boston, USA
| | - Edmund Keliher
- Center for Systems Biology, Massachusetts General Hospital, Boston, USA
- Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Boston, USA
| | - Ralph Weissleder
- Center for Systems Biology, Massachusetts General Hospital, Boston, USA
- Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Boston, USA
| | - Bakhos A. Tannous
- Experimental Therapeutics and Molecular Imaging Laboratory, Neuroscience Center, Department of Neurology, Massachusetts General Hospital, Boston, USA
- Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, Boston, USA
- Program in Neuroscience, Harvard Medical School, Boston, USA
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6
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Niers JM, Chen JW, Weissleder R, Tannous BA. Enhanced in vivo imaging of metabolically biotinylated cell surface reporters. Anal Chem 2011; 83:994-9. [PMID: 21214190 DOI: 10.1021/ac102758m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metabolic biotinylation of intracellular and secreted proteins as well as surface receptors in mammalian cells provides a versatile way to monitor gene expression; to purify and target viral vectors; to monitor cell and tumor distribution in real time in vivo; to label cells for isolation; and to tag proteins for purification, localization, and trafficking. Here, we show that metabolic biotinylation of proteins fused to the bacterial biotin acceptor peptides (BAP) varies among different mammalian cell types and can be enhanced by over 10-fold upon overexpression of the bacterial biotin ligase directed to the same cellular compartment as the fusion protein. We also show that in vivo imaging of metabolically biotinylated cell surface receptors using streptavidin conjugates is significantly enhanced upon coexpression of bacterial biotin ligase in the secretory pathway. These findings have practical applications in designing more efficient targeting and imaging strategies.
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Affiliation(s)
- Johanna M Niers
- Neuroscience Center, Department of Neurology, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA
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7
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Minet AD, Gaster M. Pyruvate carboxylase is expressed in human skeletal muscle. Biochem Biophys Res Commun 2010; 402:196-7. [PMID: 20807508 DOI: 10.1016/j.bbrc.2010.08.102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 08/25/2010] [Indexed: 11/30/2022]
Abstract
Pyruvate carboxylase (PC) is a mitochondrial enzyme that catalyses the carboxylation of pyruvate to oxaloacetate thereby allowing supplementation of citric acid cycle intermediates. The presence of PC in skeletal muscle is controversial. We report here, that PC protein is easily detectable by streptavidin blot and describe the presence of considerable amounts of PC in cultured human myotubes and in human muscle tissue.
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Affiliation(s)
- Ariane D Minet
- Department of Endocrinology, Odense University Hospital, Denmark
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8
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Guizzunti G, Brady TP, Fischer D, Malhotra V, Theodorakis EA. Chemical biology studies on norrisolide. Bioorg Med Chem 2010; 18:2115-2122. [PMID: 20189813 DOI: 10.1016/j.bmc.2010.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2009] [Revised: 02/02/2010] [Accepted: 02/04/2010] [Indexed: 11/19/2022]
Abstract
The cellular activity of norrisolide (7), a novel Golgi-vesiculating agent, was dissected as function of its chemical structure. This natural product induces irreversible vesiculation of the Golgi membranes and blocks protein transport at the level of the Golgi. The Golgi localization and fragmentation effects of 7 depend on the presence of the perhydroindane core, while the irreversibility of fragmentation depends on the acetyl group of 7. We show that fluorescent derivatives of norrisolide are able to localize to the Golgi apparatus and represent important tools for the study of the Golgi structure and function.
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Affiliation(s)
- Gianni Guizzunti
- Department of Cell and Developmental Biology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Thomas P Brady
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Derek Fischer
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Vivek Malhotra
- Department of Cell and Developmental Biology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Emmanuel A Theodorakis
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
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9
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Anti-biotin antibodies offer superior organelle-specific labelling of mitochondria over avidin or streptavidin. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2008. [PMID: 18287658 DOI: 10.1007/978-1-59745-579-4_14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
A number of endogenously biotinylated proteins are found in both cytosol and mitochondria of mammalian cells from many tissues, including liver, spleen, pancreas, kidney, and intestine. Therefore, caution should be taken when using the biotin detection system. Endogenous biotin can interfere with staining systems that employ the use of biotin-avidin- or biotin-streptavidin-based detection systems and may therefore result in high, non-specific background staining. Here, we show that this endogenous biotin reactivity can be deliberately exploited and used as a specific mitochondrial marker in both light and electron microscopy as well as for identifying mitochondrial fractions on Western blot.
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10
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Tannous BA, Grimm J, Perry KF, Chen JW, Weissleder R, Breakefield XO. Metabolic biotinylation of cell surface receptors for in vivo imaging. Nat Methods 2006; 3:391-6. [PMID: 16628210 DOI: 10.1038/nmeth875] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2006] [Accepted: 03/21/2006] [Indexed: 02/05/2023]
Abstract
We have developed a versatile, potent technique for imaging cells in culture and in vivo by expressing a metabolically biotinylated cell-surface receptor and visualizing it with labeled streptavidin moieties. The recombinant reporter protein, which incorporates a biotin acceptor peptide (BAP) between an N-terminal signal sequence and a transmembrane domain, (BAP-TM) was efficiently biotinylated by endogenous biotin ligase in mammalian cells with the biotin displayed on the cell surface. Tumors expressing the BAP-TM have high sensitivity for magnetic resonance and fluorescence tomographic imaging in vivo after intravascular injection of streptavidin conjugated to magnetic nanoparticles or fluorochromes, respectively. Moreover, streptavidin-horseradish peroxidase conjugates in conjunction with a peroxidase-sensitive gadolinium agent further increased and prolonged the magnetic resonance signal. This BAP-TM allows noninvasive real-time imaging of any cell type transduced to express this reporter protein in culture or in vivo.
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Affiliation(s)
- Bakhos A Tannous
- Center for Molecular Imaging Research, Massachusetts General Hospital-East, Building 149, 13th Street, Charlestown, Massachusetts 02129, USA
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11
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Wimmer VC, Horstmann H, Groh A, Kuner T. Donut-like topology of synaptic vesicles with a central cluster of mitochondria wrapped into membrane protrusions: a novel structure-function module of the adult calyx of Held. J Neurosci 2006; 26:109-16. [PMID: 16399677 PMCID: PMC6674328 DOI: 10.1523/jneurosci.3268-05.2006] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Structural and functional properties of synapses are intricately and reciprocally coupled. To cope with the functional requirements in auditory processing, the calyx of Held developed distinct structural specializations such as a large number of active zones, large size, elaborate morphology, and defined distribution of ion channels. These specializations typically appear during postnatal maturation within the first 3 weeks of life and are accompanied by marked changes in the properties of synaptic transmission. We examined the arrangement of synaptic vesicles at different postnatal stages of maturation by genetically labeling vesicles with the fluorescent fusion protein synaptophysin-enhanced green fluorescent protein. Fluorescence and electron microscopy-based analyses revealed a new anatomical specialization in the mature calyx of Held. Within small, membrane-delimited compartments (swellings), synaptic vesicles formed donut-like assemblies around a central cluster of interconnected mitochondria. Adult calyces contained approximately 100 such structural units, each of them consisting of approximately 800 synaptic vesicles, six to nine mitochondria, and five to nine active zones. A donut of synaptic vesicles measured approximately 1 microm in diameter and was placed in a swelling with a volume of approximately 5 fl. Conspicuously, this structural specialization appears with the onset of hearing and may contribute to maturational changes in presynaptic function.
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Affiliation(s)
- Verena C Wimmer
- Abteilung Zellphysiologie, Max-Planck-Institut für medizinische Forschung, 69120 Heidelberg, Germany
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12
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Yagi T, Terada N, Baba T, Ohno S. Localization of endogenous biotin-containing proteins in mouse Bergmann glial cells. ACTA ACUST UNITED AC 2004; 34:567-72. [PMID: 14626347 DOI: 10.1023/a:1026053029546] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A peroxidase-conjugated avidin-biotin complex was used to detect endogenous biotin-containing proteins in mouse cerebellum. By this method, Bergmann glial cells were found to be strongly labelled in the adult mouse cerebellum. Developmentally, cells in the granular layer, probably astrocytes, appeared to be labelled around postnatal 10-day (P10). Their labelling decreased after P20, although the positive-labelling remained in the Bergmann glial cells up to the adult stage. The findings were confirmed by using a Alexa Fluor 488-conjugated streptavidin technique. The labelling was not affected by routine hydrogen peroxide treatment, but it was eliminated by avidin-biotin blocking. By another transblot method, the reactive proteins in the mouse cerebellum were found to be 120 kDa (the strongest one) and 75 kDa. For electron microscopy, a gold-conjugated anti-biotin antibody was immunoreacted to the mitochondria of Bergmann glial cells. These results suggest that endogenous biotin-containing proteins are abundant in the Bergmann glial cells. Therefore, the avidin-biotin complex method is useful for detecting Bergmann glial cells, probably because of the difference of biotin metabolism in the cerebellar glial cells.
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Affiliation(s)
- Takashi Yagi
- Department of Anatomy, Faculty of Medicine, University of Yamanashi, Tamaho, Yamanashi 409-3898, Japan
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13
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Sasaki E, Okamoto Y, Yoshida K, Okamura H, Shimizu K, Nasu F, Morimoto H, Haneji T. Transblot and cytochemical identification of avidin-interacting proteins in mitochondria of cultured cells. Histochem Cell Biol 2003; 120:327-33. [PMID: 14574588 DOI: 10.1007/s00418-003-0572-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/12/2003] [Indexed: 10/26/2022]
Abstract
Cell lysates prepared from 3T3-L1 cells were analyzed by western blotting using the avidin-biotin complex system and anti-Bax antibody. The antibody interacted with bands of proteins with estimated molecular weights of 120, 74, 72, and 25 kDa. However, only the 25-kDa band was detected with the anti-Bax antibody when the direct immunoblotting method was used. Peroxidase-conjugated avidin interacted with the 120-, 74-, and 72-kDa bands. This interaction was not limited to 3T3-L1 cells, because peroxidase-avidin also interacted with these three proteins in MC3T3-E1, YROS, Saos-2, MG63, SCCKN, and SCCTF cells although the staining intensity was different in each cell type. Avidin-peroxidase also interacted with these three proteins in the mitochondria-containing fractions prepared from 3T3-L1 cells. FITC-streptavidin was also localized in mitochondria in the cultured cells. The localization of avidin/streptavidin-interacting proteins in mitochondria was confirmed by using double staining with FITC-streptavidin and Mito-tracker.
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Affiliation(s)
- Eiko Sasaki
- Department of Histology and Oral Histology, School of Dentistry, The University of Tokushima, 3-18-15 Kuramoto-cho, 770-8504 Tokushima, Japan
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14
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Lu QL, Partridge TA. A new blocking method for application of murine monoclonal antibody to mouse tissue sections. J Histochem Cytochem 1998; 46:977-84. [PMID: 9671449 DOI: 10.1177/002215549804600813] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Antigen detection with primary antibody of the same species as the test tissue is complicated by high levels of background staining when indirect immunohistochemical detection methods are used. This severely limits the use of murine monoclonal antibodies on tissues of the mouse, the most widely used experimental model system; no method for blocking this is fully satisfactory. Here we show that background staining encountered in this system results largely from the binding of secondary antibodies via both Fc and Fab to endogenous immunoglobulins and other tissue components. A simple and efficient blocking strategy was established, employing papain-digested whole fragments of unlabeled secondary anti-mouse Igs enriched with Fc fragment of the same Igs. We have used this method to visualize dystrophin, an antigen expressed at low level, in revertant fibers of mdx mouse by both immunoperoxidase and immunofluorescence methods. In combination with the use of a biotin-streptavidin immunohistochemical detection protocol with biotinylated anti-mouse F(ab')2 as second layer, we eliminated the heavy background in this system and achieved strong signal amplification to demonstrate the specific antigen clearly. Double labeling with one mouse antibody and one antibody from another species was performed without signal interference. This principle can be adapted for wider applications, such as antibodies of other species on homologous tissues and perhaps where high background is found with heterologous antibodies. (J Histochem Cytochem 46:977-983, 1998)
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Affiliation(s)
- Q L Lu
- Muscle Cell Biology, Medical Research Council Clinical Science Centre, Hammersmith Hospital, London, United Kingdom
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15
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Praul CA, Brubaker KD, Leach RM, Gay CV. Detection of endogenous biotin-containing proteins in bone and cartilage cells with streptavidin systems. Biochem Biophys Res Commun 1998; 247:312-4. [PMID: 9642122 DOI: 10.1006/bbrc.1998.8757] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
When utilizing streptavidin systems with Western blots of chondrocyte, osteoblast and osteoclast lysates, proteins of the molecular weights 116 kDa, 75 kDa and 67 kDa were observed to be bound by streptavidin alone. Streptavidin binding could not be blocked by pre-incubation with an RGD containing peptide. The same proteins were bound by ExtrAvidin which lacks the RGD sequence present in streptavidin. Pre-incubation with free biotin completely abolished the binding of both streptavidin and ExtrAvidin. The three proteins observed are believed to be the biotin containing carboxylases: pyruvate carboxylase, 3-methylcrotonyl carboxylase, and propionyl carboxylase. The findings of this study underscore the need to apply vigorous controls to distinguish between endogenous biotinylated proteins and biotin used as a means to amplify avidin detection systems since a wide variety of proteins with relevance to bone and cartilage biology have molecular weights similar to the biotin carboxylases.
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Affiliation(s)
- C A Praul
- Department of Poultry Science, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Hollinshead M, Sanderson J, Vaux DJ. Anti-biotin antibodies offer superior organelle-specific labeling of mitochondria over avidin or streptavidin. J Histochem Cytochem 1997; 45:1053-7. [PMID: 9267466 DOI: 10.1177/002215549704500803] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The mitochondrial matrix contains endogenously biotinylated proteins. These proteins can cause unexpected background signal when biotin-avidin- or biotin-streptavidin-based detection systems are used in immunocytochemistry. Here we show that this reactivity can be deliberately exploited, using a simple anti-biotin reagent, to obtain strong and highly specific labeling of mitochondria by both light and electron microscopy. The signal is substantially stronger than when either avidin or streptavidin is used to detect the endogenous biotin. These results confirm the accessibility of protein-bound endogenous biotin to exogenous probes, and localize the biotinylated enzymes to the mitochondrial matrix.
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Affiliation(s)
- M Hollinshead
- Sir William Dunn School of Pathology, Oxford, United Kingdom
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17
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Chevalier J, Yi J, Michel O, Tang XM. Biotin and digoxigenin as labels for light and electron microscopy in situ hybridization probes: where do we stand? J Histochem Cytochem 1997; 45:481-91. [PMID: 9111227 DOI: 10.1177/002215549704500401] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Biotin was recently applied to detect cellular DNA or RNA. In combination with avidin, streptavidin or antibody, it can be conjugated with fluorescent dye, enzyme, ferritin, or gold. However, emphasis has recently been placed on the false-positive results that are obtained when this probe is used, because endogenous biotin may sometimes interfere with specific signals. Digoxigenin appears to be an interesting alternative because it is present exclusively in Digitalis plants as a secondary metabolite. We discuss in this review the efficiency and the respective advantages and disavantages of these two probes for in situ hybridization, mainly at the electron microscopic level.
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Affiliation(s)
- J Chevalier
- Unité de Recherche Immunopathologie Humaine, INSERM U430, Hôpital Broussais, Paris, France
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18
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Kin SH, Suh YH. Limitation of enzyme-conjugated streptavidin-biotin system in the detection of eukaryotic proteins by immunoblot analysis. Comp Biochem Physiol B Biochem Mol Biol 1996; 115:57-61. [PMID: 8896332 DOI: 10.1016/0305-0491(96)00084-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In a series of Western blot experiments, we discovered that peroxidase-conjugated streptavidin alone without pretreatment of primary and secondary antibodies could react specifically with approximately 145 KD and 75 KD proteins. These bands were eliminated by preincubation with nonconjugated streptavidin. They were found in virtually all tissues of the mouse and rat and various cell lines to a variable degree. It is the thought that these bands may represent some members of biotin-coupled carboxylating enzymes. From these results we suggest that the enzyme-conjugated streptavidin system is not suitable to detect the protein in the eukaryotic cells and tissues by immunoblot analysis, especially those whose size is similar to the biotin-coupled carboxylases.
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Affiliation(s)
- S H Kin
- Department of Pharmacology, College of Medicine, Seoul National University, Korea
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