1
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Philippi M, Richter CP, Kappen M, Watrinet I, Miao Y, Runge M, Jorde L, Korneev S, Holtmannspötter M, Kurre R, Holthuis JCM, Garcia KC, Plückthun A, Steinhart M, Piehler J, You C. Biofunctional Nanodot Arrays in Living Cells Uncover Synergistic Co-Condensation of Wnt Signalodroplets. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2203723. [PMID: 36266931 DOI: 10.1002/smll.202203723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/30/2022] [Indexed: 06/16/2023]
Abstract
Qualitative and quantitative analysis of transient signaling platforms in the plasma membrane has remained a key experimental challenge. Here, biofunctional nanodot arrays (bNDAs) are developed to spatially control dimerization and clustering of cell surface receptors at the nanoscale. High-contrast bNDAs with spot diameters of ≈300 nm are obtained by capillary nanostamping of bovine serum albumin bioconjugates, which are subsequently biofunctionalized by reaction with tandem anti-green fluorescence protein (GFP) clamp fusions. Spatially controlled assembly of active Wnt signalosomes is achieved at the nanoscale in the plasma membrane of live cells by capturing the co-receptor Lrp6 into bNDAs via an extracellular GFP tag. Strikingly, co-recruitment is observed of co-receptor Frizzled-8 as well as the cytosolic scaffold proteins Axin-1 and Disheveled-2 into Lrp6 nanodots in the absence of ligand. Density variation and the high dynamics of effector proteins uncover highly cooperative liquid-liquid phase separation (LLPS)-driven assembly of Wnt "signalodroplets" at the plasma membrane, pinpointing the synergistic effects of LLPS for Wnt signaling amplification. These insights highlight the potential of bNDAs for systematically interrogating nanoscale signaling platforms and condensation at the plasma membrane of live cells.
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Affiliation(s)
- Michael Philippi
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Christian P Richter
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Marie Kappen
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Isabelle Watrinet
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Yi Miao
- Department of Molecular and Cellular Physiology, Department of Structural Biology, Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Mercedes Runge
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Lara Jorde
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Sergej Korneev
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Michael Holtmannspötter
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Rainer Kurre
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Joost C M Holthuis
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - K Christopher Garcia
- Department of Molecular and Cellular Physiology, Department of Structural Biology, Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Andreas Plückthun
- Department of Biochemistry, University of Zurich, Winterthurerstr. 190, Zurich, 8057, Switzerland
| | - Martin Steinhart
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Jacob Piehler
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
| | - Changjiang You
- Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), Osnabrück University, 49076, Osnabrück, Germany
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2
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Wang Z, Ji L, Ren Y, Liu M, Ai X, Yang C. Preparation and Anti-tumor Study of Dextran 70,000-Selenium Nanoparticles and Poloxamer 188-Selenium Nanoparticles. AAPS PharmSciTech 2021; 23:29. [PMID: 34931279 DOI: 10.1208/s12249-021-02141-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/13/2021] [Indexed: 11/30/2022] Open
Abstract
The anti-tumor effect of selenium nanoparticles (SeNPs) has received more and more attention. However, the clinical application of SeNPs is not optimistic due to the poor stability. To improve the stability of SeNPs, many polymers are used to modify the SeNPs. However, most of the polymers are not approved by FDA. It is significant to develop a SeNPs product with good stability for clinic application. Dextran 70,000 (T70) and poloxamer 188 (P188) are FDA-approved pharmaceutical injection excipients. In this study, we decorate SeNPs with T70 and P188 and assess the physicochemical characterization, storage stability, and anti-tumor activities of T70-SeNPs and P188-SeNPs. Transmission electron microscopy (TEM) shows that T70-SeNPs and P188-SeNPs are spherical particles with particle sizes of 110 nm and 60 nm respectively. Fourier-Transform Infrared Spectra (FT-IR) show that T70 or P188 can interact with SeNPs through hydrogen bonding. Stability study shows that P188-SeNPs freeze-dried powder and T70-SeNPs freeze-dried powder remain stable at 4℃ for 6 months. T70-SeNPs and P188-SeNPs can aggregate in cell matrix and play an anti-tumor role to HepG2 by promoting apoptosis, increasing reactive oxygen species (ROS) content and reducing mitochondrial membrane potential (MMP). This study can provide reference for industrial production of SeNPs products.
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3
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Bhagawati M, Arroum T, Webeling N, Montoro AG, Mootz HD, Busch KB. The receptor subunit Tom20 is dynamically associated with the TOM complex in mitochondria of human cells. Mol Biol Cell 2021; 32:br1. [PMID: 34347503 PMCID: PMC8684756 DOI: 10.1091/mbc.e21-01-0042] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
The outer membrane translocase (TOM) is the import channel for nuclear-encoded mitochondrial proteins. The general import pore contains Tom40, Tom22, Tom5, Tom6, and Tom7. Precursor proteins are bound by the (peripheral) receptor proteins Tom20, Tom22, and Tom70 before being imported by the TOM complex. Here we investigated the association of the receptor Tom20 with the TOM complex. Tom20 was found in the TOM complex, but not in a smaller subcomplex. In addition, a subcomplex was found without Tom40 and Tom7 but with Tom20. Using single particle tracking of labeled Tom20 in overexpressing human cells, we show that Tom20 has, on average, higher lateral mobility in the membrane than Tom7/TOM. After ligation of Tom20 with the TOM complex by post-tranlational protein trans-splicing using the traceless, ultrafast cleaved Gp41-1 integrin system, a significant decrease in the mean diffusion coefficient of Tom20 was observed in the resulting Tom20–Tom7 fusion protein. Exposure of Tom20 to high substrate loading also resulted in reduced mobility. Taken together, our data show that the receptor subunit Tom20 interacts dynamically with the TOM core complex. We suggest that the TOM complex containing Tom20 is the active import pore and that Tom20 is associated when substrate is available.
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Affiliation(s)
- Maniraj Bhagawati
- Department of Biology, Institute of Molecular Cell Biology, University of Münster, Schloßplatz 5, 48149 Münster (Germany).,Department of Chemistry and Pharmacy, Institute of Biochemistry, University of Münster, Corrensstraße 36, 48149 Münster (Germany).,Center of Cellular Nanoanalytics Osnabrück, 49076 Osnabrück (Germany)
| | - Tasnim Arroum
- Department of Biology, Institute of Molecular Cell Biology, University of Münster, Schloßplatz 5, 48149 Münster (Germany)
| | - Niklas Webeling
- Department of Biology, Institute of Molecular Cell Biology, University of Münster, Schloßplatz 5, 48149 Münster (Germany)
| | - Ayelén González Montoro
- Center of Cellular Nanoanalytics Osnabrück, 49076 Osnabrück (Germany).,Cellular communication laboratoraty, Department of Biology and Chemistry, University of Osnabrueck, Barbarastraße 13, 49076 Osnabrueck (Germany)
| | - Henning D Mootz
- Department of Chemistry and Pharmacy, Institute of Biochemistry, University of Münster, Corrensstraße 36, 48149 Münster (Germany)
| | - Karin B Busch
- Department of Biology, Institute of Molecular Cell Biology, University of Münster, Schloßplatz 5, 48149 Münster (Germany)
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4
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Flesch J, Bettenhausen M, Kazmierczak M, Klesse WM, Skibitzki O, Psathaki OE, Kurre R, Capellini G, Guha S, Schroeder T, Witzigmann B, You C, Piehler J. Three-Dimensional Interfacing of Cells with Hierarchical Silicon Nano/Microstructures for Midinfrared Interrogation of In Situ Captured Proteins. ACS APPLIED MATERIALS & INTERFACES 2021; 13:8049-8059. [PMID: 33570931 DOI: 10.1021/acsami.0c22421] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Label-free optical detection of biomolecules is currently limited by a lack of specificity rather than sensitivity. To exploit the much more characteristic refractive index dispersion in the mid-infrared (IR) regime, we have engineered three-dimensional IR-resonant silicon micropillar arrays (Si-MPAs) for protein sensing. By exploiting the unique hierarchical nano- and microstructured design of these Si-MPAs attained by CMOS-compatible silicon-based microfabrication processes, we achieved an optimized interrogation of surface protein binding. Based on spatially resolved surface functionalization, we demonstrate controlled three-dimensional interfacing of mammalian cells with Si-MPAs. Spatially controlled surface functionalization for site-specific protein immobilization enabled efficient targeting of soluble and membrane proteins into sensing hotspots directly from cells cultured on Si-MPAs. Protein binding to Si-MPA hotspots at submonolayer level was unambiguously detected by conventional Fourier transform IR spectroscopy. The compatibility with cost-effective CMOS-based microfabrication techniques readily allows integration of this novel IR transducer into fully fledged bioanalytical microdevices for selective and sensitive protein sensing.
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Affiliation(s)
- Julia Flesch
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
| | - Maximilian Bettenhausen
- Department of Electrical Engineering/Computer Science and CINSaT, University of Kassel, Kassel 34121, Germany
| | - Marcin Kazmierczak
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Wolfgang M Klesse
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Oliver Skibitzki
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Olympia E Psathaki
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
| | - Rainer Kurre
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
| | - Giovanni Capellini
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
- Dipartimento di Scienze, Università Roma Tre, Roma 00146, Italy
| | - Subhajit Guha
- IHP-Leibniz-Institut für Innovative Mikroelektronik, Frankfurt (Oder) 15236, Germany
| | - Thomas Schroeder
- Leibniz-Institut für Kristallzüchtung (IKZ), Berlin 12489, Germany
| | - Bernd Witzigmann
- Department of Electrical Engineering/Computer Science and CINSaT, University of Kassel, Kassel 34121, Germany
| | - Changjiang You
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
| | - Jacob Piehler
- Department of Biology, University of Osnabrück, Osnabrück 49076, Germany
- Center of Cellular Nanoanalytics, University of Osnabrück, Osnabrück 49076, Germany
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5
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Philippi M, You C, Richter CP, Schmidt M, Thien J, Liße D, Wollschläger J, Piehler J, Steinhart M. Close-packed silane nanodot arrays by capillary nanostamping coupled with heterocyclic silane ring opening. RSC Adv 2019; 9:24742-24750. [PMID: 35528685 PMCID: PMC9069738 DOI: 10.1039/c9ra03440d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 07/29/2019] [Indexed: 11/21/2022] Open
Abstract
We report the parallel generation of close-packed ordered silane nanodot arrays with nanodot diameters of few 100 nm and nearest-neighbor distances in the one-micron range.
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Affiliation(s)
- Michael Philippi
- Institute for Chemistry of New Materials
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | - Changjiang You
- Department of Biology
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | - Christian P. Richter
- Department of Biology
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | - Mercedes Schmidt
- Institute for Chemistry of New Materials
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | - Jannis Thien
- Department of Physics
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | - Domenik Liße
- Department of Biology
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | | | - Jacob Piehler
- Department of Biology
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
| | - Martin Steinhart
- Institute for Chemistry of New Materials
- Center for Cellular Nanoanalytics (CellNanOs)
- Universität Osnabrück
- 49076 Osnabrück
- Germany
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6
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Kuo CT, Wu IC, Chen L, Yu J, Wu L, Chiu DT. Improving the Photostability of Semiconducting Polymer Dots Using Buffers. Anal Chem 2018; 90:11785-11790. [PMID: 30277754 DOI: 10.1021/acs.analchem.8b03104] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photostability of fluorescent probes is critical in biological imaging, especially for long-term observational analyses. Here, we describe a simple and universal method to improve the photostability of semiconducting polymer dots (Pdots) and other fluorescent probes by using buffers. Using Pdots as a model system, we found that HEPES or MES buffer can improve the photostability of Pdots by a factor of 20. Through a systematic study, we show that Pdot photobleaching is dominated by photoinduced radicals which can be quenched by the piperazine or morpholine structures of these buffers, which act as radical scavengers. For conditions where choice of buffer is limited, we designed fluorescent polymers conjugated with radical scavengers to improve Pdot photostability. We then demonstrate a practical application in which HEPES buffer is used to improve the photostability of Pdots during cell imaging.
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Affiliation(s)
- Chun-Ting Kuo
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - I-Che Wu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Lei Chen
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Jiangbo Yu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Li Wu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Daniel T Chiu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
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7
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Pal K, Sharma V, Sahoo D, Kapuria N, Koner AL. Large Stokes-shifted NIR-emission from nanospace-induced aggregation of perylenemonoimide-doped polymer nanoparticles: imaging of folate receptor expression. Chem Commun (Camb) 2018; 54:523-526. [PMID: 29265142 DOI: 10.1039/c7cc08404h] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The development of a water-soluble, perylenemonoimide (PMI) dye-doped polymer nanoparticle (PNP) with NIR emission for live-cell imaging is demonstrated. The large Stokes-shifted NIR emission is due to confined nanospace-induced aggregation offered by the polymer matrix. Later, folic acid functionalised PNP (PNP-FA) is successfully employed to differentiate folate receptor positive and negative cancer cells.
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Affiliation(s)
- Kaushik Pal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal, MP 462066, India.
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8
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Wang Z, Guo W, Kuang X, Hou S, Liu H. Nanopreparations for mitochondria targeting drug delivery system: Current strategies and future prospective. Asian J Pharm Sci 2017; 12:498-508. [PMID: 32104363 PMCID: PMC7032167 DOI: 10.1016/j.ajps.2017.05.006] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 05/23/2017] [Indexed: 01/01/2023] Open
Abstract
Mitochondria are a novel and promising therapeutic target for diagnosis, treatment and prevention of a lot of human diseases such as cancer, metabolic diseases and neurodegenerative disease. Owing to the mitochondrial special bilayer structure and highly negative potential nature, therapeutic molecules have multiple difficulties in reaching mitochondria. To overcome multiple barriers for targeting mitochondria, the researchers developed various pharmaceutical preparations such as liposomes, polymeric nanoparticles and inorganic nanoparticles modified by mitochondriotropic moieties like dequalinium (DQA), triphenylphosphonium (TPP), mitochondrial penetrating peptides (MPPs) and mitochondrial protein import machinery that allow specific targeting. The targeted formulations exhibited enhanced pharmacological effect and better therapeutic effect than their untargeted counterpart both in vitro and in vivo. Nanocarriers may be used for bio-therapeutic delivery into specific mitochondria that possess a great potential treatment of mitochondria related diseases.
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Affiliation(s)
| | | | | | | | - Hongzhuo Liu
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China
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9
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Yukawa H, Baba Y. In Vivo Fluorescence Imaging and the Diagnosis of Stem Cells Using Quantum Dots for Regenerative Medicine. Anal Chem 2017; 89:2671-2681. [PMID: 28194939 DOI: 10.1021/acs.analchem.6b04763] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Hiroshi Yukawa
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.,ImPACT Research Center for Advanced Nanobiodevices, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Yoshinobu Baba
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.,ImPACT Research Center for Advanced Nanobiodevices, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.,Institute of Innovation for Future Society, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.,Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , 2217-14, Hayashi-cho, Takamatsu 761-0395, Japan.,College of Pharmacy, Kaohsiung Medical University , Shin-Chuan 1 st Rd., Kaohsiung, 807, Taiwan, R.O.C
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10
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Wedeking T, Löchte S, Birkholz O, Wallenstein A, Trahe J, Klingauf J, Piehler J, You C. Spatiotemporally Controlled Reorganization of Signaling Complexes in the Plasma Membrane of Living Cells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:5912-5918. [PMID: 26421417 DOI: 10.1002/smll.201502132] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 08/18/2015] [Indexed: 06/05/2023]
Abstract
Triggered immobilization of proteins in the plasma membrane of living cells into functional micropatterns is established by using an adaptor protein, which is comprised of an antiGFP nanobody fused to the HaloTag protein. Efficient in situ reorganization of the type I interferon receptor subunits as well as intact, fully functional signaling complexes in living cells are achieved by this method.
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Affiliation(s)
- Tim Wedeking
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Sara Löchte
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Oliver Birkholz
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Alexander Wallenstein
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Julia Trahe
- Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch-Str. 31, Münster, 48149, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003-CiM), University of Münster, Münster, 48149, Germany
| | - Jürgen Klingauf
- Institute of Medical Physics and Biophysics, University of Münster, Robert-Koch-Str. 31, Münster, 48149, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003-CiM), University of Münster, Münster, 48149, Germany
| | - Jacob Piehler
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
| | - Changjiang You
- Department of BiologyUniversity of Osnabrück, Barbarastr. 11, Osnabrück, 49076, Germany
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11
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Murrey HE, Judkins JC, Am Ende CW, Ballard TE, Fang Y, Riccardi K, Di L, Guilmette ER, Schwartz JW, Fox JM, Johnson DS. Systematic Evaluation of Bioorthogonal Reactions in Live Cells with Clickable HaloTag Ligands: Implications for Intracellular Imaging. J Am Chem Soc 2015; 137:11461-75. [PMID: 26270632 PMCID: PMC4572613 DOI: 10.1021/jacs.5b06847] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
![]()
Bioorthogonal
reactions, including the strain-promoted azide–alkyne
cycloaddition (SPAAC) and inverse electron demand Diels–Alder
(iEDDA) reactions, have become increasingly popular for live-cell
imaging applications. However, the stability and reactivity of reagents
has never been systematically explored in the context of a living
cell. Here we report a universal, organelle-targetable system based
on HaloTag protein technology for directly comparing bioorthogonal
reagent reactivity, specificity, and stability using clickable HaloTag
ligands in various subcellular compartments. This system enabled a
detailed comparison of the bioorthogonal reactions in live cells and
informed the selection of optimal reagents and conditions for live-cell
imaging studies. We found that the reaction of sTCO with monosubstituted
tetrazines is the fastest reaction in cells; however, both reagents
have stability issues. To address this, we introduced a new variant
of sTCO, Ag-sTCO, which has much improved stability and can be used
directly in cells for rapid bioorthogonal reactions with tetrazines.
Utilization of Ag complexes of conformationally strained trans-cyclooctenes should greatly expand their usefulness especially when
paired with less reactive, more stable tetrazines.
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Affiliation(s)
- Heather E Murrey
- Worldwide Medicinal Chemistry, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States
| | - Joshua C Judkins
- Worldwide Medicinal Chemistry, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States
| | - Christopher W Am Ende
- Worldwide Medicinal Chemistry, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States
| | - T Eric Ballard
- Worldwide Medicinal Chemistry, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States.,Pharmacokinetics, Dynamics and Metabolism, Pfizer Worldwide Research and Development , Groton, Connecticut 06340, United States
| | - Yinzhi Fang
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware , Newark, Delaware 19716, United States
| | - Keith Riccardi
- Pharmacokinetics, Dynamics and Metabolism, Pfizer Worldwide Research and Development , Groton, Connecticut 06340, United States
| | - Li Di
- Pharmacokinetics, Dynamics and Metabolism, Pfizer Worldwide Research and Development , Groton, Connecticut 06340, United States
| | - Edward R Guilmette
- Neuroscience and Pain Research Unit, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States
| | - Joel W Schwartz
- Neuroscience and Pain Research Unit, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States
| | - Joseph M Fox
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware , Newark, Delaware 19716, United States
| | - Douglas S Johnson
- Worldwide Medicinal Chemistry, Pfizer Worldwide Research and Development , Cambridge, Massachusetts 02139, United States
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12
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Etoc F, Vicario C, Lisse D, Siaugue JM, Piehler J, Coppey M, Dahan M. Magnetogenetic control of protein gradients inside living cells with high spatial and temporal resolution. NANO LETTERS 2015; 15:3487-94. [PMID: 25895433 DOI: 10.1021/acs.nanolett.5b00851] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Tools for controlling the spatial organization of proteins are a major prerequisite for deciphering mechanisms governing the dynamic architecture of living cells. Here, we have developed a generic approach for inducing and maintaining protein gradients inside living cells by means of biofunctionalized magnetic nanoparticles (MNPs). For this purpose, we tailored the size and surface properties of MNPs in order to ensure unhindered mobility in the cytosol. These MNPs with a core diameter below 50 nm could be rapidly relocalized in living cells by exploiting biased diffusion at weak magnetic forces in the femto-Newton range. In combination with MNP surface functionalization for specific in situ capturing of target proteins as well as efficient delivery into the cytosplasm, we here present a comprehensive technology for controlling intracellular protein gradients with a temporal resolution of a few tens of seconds.
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Affiliation(s)
- Fred Etoc
- †Laboratoire Physico-Chimie, Institut Curie, CNRS UMR168, Paris-Science Lettres, Université Pierre et Marie Curie-Paris 6, 75005 Paris, France
| | - Chiara Vicario
- †Laboratoire Physico-Chimie, Institut Curie, CNRS UMR168, Paris-Science Lettres, Université Pierre et Marie Curie-Paris 6, 75005 Paris, France
| | - Domenik Lisse
- †Laboratoire Physico-Chimie, Institut Curie, CNRS UMR168, Paris-Science Lettres, Université Pierre et Marie Curie-Paris 6, 75005 Paris, France
- ‡Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
| | - Jean-Michel Siaugue
- §Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, F-75005 Paris, France
| | - Jacob Piehler
- ‡Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
| | - Mathieu Coppey
- †Laboratoire Physico-Chimie, Institut Curie, CNRS UMR168, Paris-Science Lettres, Université Pierre et Marie Curie-Paris 6, 75005 Paris, France
| | - Maxime Dahan
- †Laboratoire Physico-Chimie, Institut Curie, CNRS UMR168, Paris-Science Lettres, Université Pierre et Marie Curie-Paris 6, 75005 Paris, France
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13
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Ito T, Nakamura T, Kusaka E, Kurihara R, Tanabe K. Controlling Localization and Excretion of Nanoparticles by Click Modification of the Surface Chemical Structures inside Living Cells. Chempluschem 2015; 80:796-799. [DOI: 10.1002/cplu.201402436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Indexed: 11/11/2022]
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14
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Löchte S, Waichman S, Beutel O, You C, Piehler J. Live cell micropatterning reveals the dynamics of signaling complexes at the plasma membrane. ACTA ACUST UNITED AC 2015; 207:407-18. [PMID: 25385185 PMCID: PMC4226739 DOI: 10.1083/jcb.201406032] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The use of micropatterned surfaces that bind HaloTag fusion proteins allows spatial organization of plasma membrane proteins for efficient visualization and quantification of protein–protein interactions in live cells. Interactions of proteins in the plasma membrane are notoriously challenging to study under physiological conditions. We report in this paper a generic approach for spatial organization of plasma membrane proteins into micropatterns as a tool for visualizing and quantifying interactions with extracellular, intracellular, and transmembrane proteins in live cells. Based on a protein-repellent poly(ethylene glycol) polymer brush, micropatterned surface functionalization with the HaloTag ligand for capturing HaloTag fusion proteins and RGD peptides promoting cell adhesion was devised. Efficient micropatterning of the type I interferon (IFN) receptor subunit IFNAR2 fused to the HaloTag was achieved, and highly specific IFN binding to the receptor was detected. The dynamics of this interaction could be quantified on the single molecule level, and IFN-induced receptor dimerization in micropatterns could be monitored. Assembly of active signaling complexes was confirmed by immunostaining of phosphorylated Janus family kinases, and the interaction dynamics of cytosolic effector proteins recruited to the receptor complex were unambiguously quantified by fluorescence recovery after photobleaching.
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Affiliation(s)
- Sara Löchte
- Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
| | - Sharon Waichman
- Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
| | - Oliver Beutel
- Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
| | - Changjiang You
- Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
| | - Jacob Piehler
- Department of Biology, University of Osnabrück, 49076 Osnabrück, Germany
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15
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Bonnemay L, Hoffmann C, Gueroui Z. Remote control of signaling pathways using magnetic nanoparticles. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2014; 7:342-54. [DOI: 10.1002/wnan.1313] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 09/04/2014] [Accepted: 09/29/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Louise Bonnemay
- Département de ChimieEcole Normale Supérieure ‐ PSL Research University, UMR 8640 ‐ CNRS ‐ ENS ‐ UPMCParisFrance
| | - Céline Hoffmann
- Département de ChimieEcole Normale Supérieure ‐ PSL Research University, UMR 8640 ‐ CNRS ‐ ENS ‐ UPMCParisFrance
| | - Zoher Gueroui
- Département de ChimieEcole Normale Supérieure ‐ PSL Research University, UMR 8640 ‐ CNRS ‐ ENS ‐ UPMCParisFrance
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16
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Sun C, Cao Z, Wu M, Lu C. Intracellular tracking of single native molecules with electroporation-delivered quantum dots. Anal Chem 2014; 86:11403-9. [PMID: 25341054 DOI: 10.1021/ac503363m] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Quantum dots (QDs) have found a wide range of biological applications as fluorophores due to their extraordinary brightness and high photostability that are far superior to those of conventional organic dyes. These traits are particularly appealing for studying cell biology under a cellular autofluorescence background and with a long observation period. However, it remains the most important open challenge to target QDs at native intracellular molecules and organelles in live cells. Endocytosis-based delivery methods lead to QDs encapsulated in vesicles that have their surface biorecognition element hidden from the intracellular environment. The probing of native molecules using QDs has been seriously hindered by the lack of consistent approaches for delivery of QDs with exposed surface groups. In this study, we demonstrate that electroporation (i.e., the application of short electric pulses for cell permeabilization) generates reproducible results for delivering QDs into cells. We show evidence that electroporation-based delivery does not involve endocytosis or vesicle encapsulation of QDs. The amount of QD loading and the resulting cell viability can be adjusted by varying the parameters associated with the electroporation operation. To demonstrate the application of our approach for intracellular targeting, we study single-molecule motility of kinesin in live cells by labeling native kinesins using electroporation-delivered QDs. We envision that electroporation may serve as a simple and universal tool for delivering QDs into cells to label and probe native molecules and organelles.
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Affiliation(s)
- Chen Sun
- School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University , Blacksburg, Virginia 24061, United States
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17
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You C, Richter CP, Löchte S, Wilmes S, Piehler J. Dynamic Submicroscopic Signaling Zones Revealed by Pair Correlation Tracking and Localization Microscopy. Anal Chem 2014; 86:8593-602. [DOI: 10.1021/ac501127r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Changjiang You
- Department
of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
| | - Christian P. Richter
- Department
of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
| | - Sara Löchte
- Department
of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
| | - Stephan Wilmes
- Department
of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
| | - Jacob Piehler
- Department
of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
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18
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Lisse D, Richter CP, Drees C, Birkholz O, You C, Rampazzo E, Piehler J. Monofunctional stealth nanoparticle for unbiased single molecule tracking inside living cells. NANO LETTERS 2014; 14:2189-2195. [PMID: 24655019 DOI: 10.1021/nl500637a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
On the basis of a protein cage scaffold, we have systematically explored intracellular application of nanoparticles for single molecule studies and discovered that recognition by the autophagy machinery plays a key role for rapid metabolism in the cytosol. Intracellular stealth nanoparticles were achieved by heavy surface PEGylation. By combination with a generic approach for nanoparticle monofunctionalization, efficient labeling of intracellular proteins with high fidelity was accomplished, allowing unbiased long-term tracking of proteins in the outer mitochondrial membrane.
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Affiliation(s)
- Domenik Lisse
- Department of Biology, University of Osnabrück , Osnabrück, Germany
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19
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Piehler J. Spectroscopic techniques for monitoring protein interactions in living cells. Curr Opin Struct Biol 2014; 24:54-62. [DOI: 10.1016/j.sbi.2013.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 11/15/2013] [Accepted: 11/22/2013] [Indexed: 12/21/2022]
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20
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Montalti M, Prodi L, Rampazzo E, Zaccheroni N. Dye-doped silica nanoparticles as luminescent organized systems for nanomedicine. Chem Soc Rev 2014; 43:4243-68. [DOI: 10.1039/c3cs60433k] [Citation(s) in RCA: 222] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
This review summarizes developments and applications of luminescent dye doped silica nanoparticles as versatile organized systems for nanomedicine.
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Affiliation(s)
- M. Montalti
- Department of Chemistry “G. Ciamician”
- University of Bologna
- 40126 Bologna, Italy
| | - L. Prodi
- Department of Chemistry “G. Ciamician”
- University of Bologna
- 40126 Bologna, Italy
| | - E. Rampazzo
- Department of Chemistry “G. Ciamician”
- University of Bologna
- 40126 Bologna, Italy
| | - N. Zaccheroni
- Department of Chemistry “G. Ciamician”
- University of Bologna
- 40126 Bologna, Italy
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21
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Xu J, Chang J, Yan Q, Dertinger T, Bruchez M, Weiss S. Labeling Cytosolic Targets in Live Cells with Blinking Probes. J Phys Chem Lett 2013; 4:2138-2146. [PMID: 23930154 PMCID: PMC3733402 DOI: 10.1021/jz400682m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
With the advent of superresolution imaging methods, fast dynamic imaging of biological processes in live cells remains a challenge. A subset of these methods requires the cellular targets to be labeled with spontaneously blinking probes. The delivery and specific targeting of cytosolic targets and the control of the probes' blinking properties are reviewed for three types of blinking probes: quantum dots, synthetic dyes, and fluorescent proteins.
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Affiliation(s)
- Jianmin Xu
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles CA 90095
| | - Jason Chang
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles CA 90095
| | - Qi Yan
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh PA 15213
| | | | - Marcel Bruchez
- Department of Chemistry, Carnegie Mellon University, Pittsburgh PA 15213
- Department of Biological Sciences, Carnegie Mellon University, Pittsburgh PA 15213
| | - Shimon Weiss
- Department of Chemistry & Biochemistry, University of California Los Angeles, Los Angeles CA 90095
- Department of Physiology, University of California Los Angeles, Los Angeles CA 90095
- Molecular Biology Institute, University of California Los Angeles, Los Angeles CA 90095
- California NanoSystems Institute, University of California Los Angeles, Los Angeles CA 90095
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22
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Lee DE, Na JH, Lee S, Kang CM, Kim HN, Han SJ, Kim H, Choe YS, Jung KH, Lee KC, Choi K, Kwon IC, Jeong SY, Lee KH, Kim K. Facile method to radiolabel glycol chitosan nanoparticles with (64)Cu via copper-free click chemistry for MicroPET imaging. Mol Pharm 2013; 10:2190-8. [PMID: 23586421 DOI: 10.1021/mp300601r] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
An efficient and straightforward method for radiolabeling nanoparticles is urgently needed to understand the in vivo biodistribution of nanoparticles. Herein, we investigated a facile and highly efficient strategy to prepare radiolabeled glycol chitosan nanoparticles with (64)Cu via a strain-promoted azide-alkyne cycloaddition strategy, which is often referred to as click chemistry. First, the azide (N3) group, which allows for the preparation of radiolabeled nanoparticles by copper-free click chemistry, was incorporated to glycol chitosan nanoparticles (CNPs). Second, the strained cyclooctyne derivative, dibenzyl cyclooctyne (DBCO) conjugated with a 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelator, was synthesized for preparing the preradiolabeled alkyne complex with (64)Cu radionuclide. Following incubation with the (64)Cu-radiolabeled DBCO complex (DBCO-PEG4-Lys-DOTA-(64)Cu with high specific activity, 18.5 GBq/μmol), the azide-functionalized CNPs were radiolabeled successfully with (64)Cu, with a high radiolabeling efficiency and a high radiolabeling yield (>98%). Importantly, the radiolabeling of CNPs by copper-free click chemistry was accomplished within 30 min, with great efficiency in aqueous conditions. In addition, we found that the (64)Cu-radiolabeled CNPs ((64)Cu-CNPs) did not show any significant effect on the physicochemical properties, such as size, zeta potential, or spherical morphology. After (64)Cu-CNPs were intravenously administered to tumor-bearing mice, the real-time, in vivo biodistribution and tumor-targeting ability of (64)Cu-CNPs were quantitatively evaluated by microPET images of tumor-bearing mice. These results demonstrate the benefit of copper-free click chemistry as a facile, preradiolabeling approach to conveniently radiolabel nanoparticles for evaluating the real-time in vivo biodistribution of nanoparticles.
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Affiliation(s)
- Dong-Eun Lee
- Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, 29 Geumgu-gil, Jeongeup, Jeonbuk 580-185, Republic of Korea
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23
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Etoc F, Lisse D, Bellaiche Y, Piehler J, Coppey M, Dahan M. Subcellular control of Rac-GTPase signalling by magnetogenetic manipulation inside living cells. NATURE NANOTECHNOLOGY 2013; 8:193-8. [PMID: 23455985 DOI: 10.1038/nnano.2013.23] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 12/31/2012] [Indexed: 05/20/2023]
Abstract
Many cell functions rely on the coordinated activity of signalling pathways at a subcellular scale. However, there are few tools capable of probing and perturbing signalling networks with a spatial resolution matching the intracellular dimensions of their activity patterns. Here we present a generic magnetogenetic approach based on the self-assembly of signalling complexes on the surface of functionalized magnetic nanoparticles inside living cells. The nanoparticles act as nanoscopic hot spots that can be displaced by magnetic forces and trigger signal transduction pathways that bring about a cell response. We applied this strategy to Rho-GTPases, a set of molecular switches known to regulate cell morphology via complex spatiotemporal patterns of activity. We demonstrate that the nanoparticle-mediated activation of signalling pathways leads to local remodelling of the actin cytoskeleton and to morphological changes.
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Affiliation(s)
- F Etoc
- Laboratoire Kastler Brossel, CNRS UMR 8552, Département de Physique et Institut de Biologie, Ecole normale supérieure, Université Pierre et Marie Curie-Paris 6, Paris, France
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24
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Koner AL, Krndija D, Hou Q, Sherratt DJ, Howarth M. Hydroxy-terminated conjugated polymer nanoparticles have near-unity bright fraction and reveal cholesterol-dependence of IGF1R nanodomains. ACS NANO 2013; 7:1137-1144. [PMID: 23330847 PMCID: PMC3584654 DOI: 10.1021/nn3042122] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 01/18/2013] [Indexed: 06/01/2023]
Abstract
Fluorescent nanoparticles have enabled many discoveries regarding how molecular machines function. Quantum dots have been the dominant class of fluorescent nanoparticles but suffer from blinking and from a substantial dark fraction--particles where the fluorescence is never seen--complicating any analysis of biological function. Nanoparticles composed of conjugated fluorescent polymers (Pdots) have recently been shown to have high brightness and no blinking. Here we develop a robust and efficient means to measure the dark fraction of Pdots, conjugating Atto dyes to the nanoparticles and testing fluorescence colocalization of dye and Pdot puncta. This established that the Pdots we generated had minimal dark fraction: ∼3%. The application of nanoparticles in biological environments is highly sensitive to surface functionalization. For Pdots we found that passivation with uncharged hydroxy-terminated polyethylene glycol caused a dramatic reduction in nonspecific cell binding and aggregation compared to a charged coating. Using carbonyl di-imidazole the hydroxy-Pdots were functionalized efficiently with streptavidin for high stability targeting, allowing specific labeling of mammalian cells. Type I insulin-like growth factor receptor (IGF1R) regulates cell survival and development, with roles in aging, heart disease, and cancer. We used hydroxy-Pdots to track the dynamics of IGF1R on a breast cancer cell-line, determining the diffusion characteristics and showing cholesterol-containing membrane nanodomains were important for receptor mobility at the plasma membrane. The near-unity bright fraction and low nonspecific binding of hydroxy-Pdots, combined with Pdot photostability and lack of blinking, provides many advantages for investigations at the single molecule level.
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Affiliation(s)
- Apurba L. Koner
- Department of Biochemistry, Oxford University, South Parks Road, OX1 3QU, United Kingdom
| | - Denis Krndija
- Department of Biochemistry, Oxford University, South Parks Road, OX1 3QU, United Kingdom
| | - Qiong Hou
- School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong, 510613, China
| | - David J. Sherratt
- Department of Biochemistry, Oxford University, South Parks Road, OX1 3QU, United Kingdom
| | - Mark Howarth
- Department of Biochemistry, Oxford University, South Parks Road, OX1 3QU, United Kingdom
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25
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You C, Wilmes S, Richter CP, Beutel O, Liße D, Piehler J. Electrostatically controlled quantum dot monofunctionalization for interrogating the dynamics of protein complexes in living cells. ACS Chem Biol 2013. [PMID: 23186299 DOI: 10.1021/cb300543t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Quantum dots (QD) are powerful labels for probing diffusion and interaction dynamics of proteins on the single molecule level in living cells. Protein cross-linking due to multifunctional QD strongly affects these properties. This becomes particularly critical when labeling interaction partners with QDs for interrogating the dynamics of complexes. We have here implemented a generic method for QD monofunctionalization based on electrostatic repulsion of a highly negatively charged peptide carrier. On the basis of this method, monobiotinylated QDs were prepared with high yield as confirmed by single molecule assays. These QDs were successfully employed for probing the assembly and diffusion dynamics of binary and ternary cytokine-receptor complexes on the surface of living cells by dual color single QD tracking. Thus, sequential and dynamic recruitment of the type I interferon receptor subunits by the ligand could be observed.
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Affiliation(s)
- Changjiang You
- Division
of Biophysics, Department of Biology, University of Osnabrück, 49076 Osnabrück,
Germany
| | - Stephan Wilmes
- Division
of Biophysics, Department of Biology, University of Osnabrück, 49076 Osnabrück,
Germany
| | - Christian P. Richter
- Division
of Biophysics, Department of Biology, University of Osnabrück, 49076 Osnabrück,
Germany
| | - Oliver Beutel
- Division
of Biophysics, Department of Biology, University of Osnabrück, 49076 Osnabrück,
Germany
| | - Domenik Liße
- Division
of Biophysics, Department of Biology, University of Osnabrück, 49076 Osnabrück,
Germany
| | - Jacob Piehler
- Division
of Biophysics, Department of Biology, University of Osnabrück, 49076 Osnabrück,
Germany
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26
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Wilkens V, Kohl W, Busch K. Restricted diffusion of OXPHOS complexes in dynamic mitochondria delays their exchange between cristae and engenders a transitory mosaic distribution. J Cell Sci 2012; 126:103-16. [DOI: 10.1242/jcs.108852] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Mitochondria are involved in cellular energy supply, signaling and apoptosis. Their ability to fuse and divide provides functional and morphological flexibility and is a key feature in mitochondrial quality maintenance. To study the impact of mitochondrial fusion/fission on the reorganization of inner membrane proteins, OXPHOS complexes in mitochondria of different HeLa cells were tagged with fluorescent proteins (GFP and RFP-HA, respectively), and cells were fused by PEG treatment. Redistribution of the tagged OXPHOS complexes was then followed by means of immuno electron microscopy, two color superresolution fluorescence microscopy and single molecule tracking. In contrast to outer membrane and matrix proteins, which mix fast and homogeneously upon mitochondrial fusion, the mixing of inner membrane proteins was decelerated. Our data suggest that in principle (i) with respect to their composition cristae are preserved during fusion of mitochondria and (ii) cristae with mixed OXPHOS complexes are only slowly and successively formed by restricted diffusion of inner membrane proteins into existing cristae. The resulting transitory mosaic appearance of the inner mitochondrial membrane in terms of composition illuminates mitochondrial heterogeneity and potentially is linked to local differences in function and membrane potential.
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