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Wang Y, Yan S, Zhang P, Zeng Z, Zhao D, Wang J, Chen H, Huang S. Osmosis-Driven Motion-Type Modulation of Biological Nanopores for Parallel Optical Nucleic Acid Sensing. ACS APPLIED MATERIALS & INTERFACES 2018; 10:7788-7797. [PMID: 29431423 DOI: 10.1021/acsami.7b18347] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Recent developments in nanopore sequencing have inspired new concepts in precision medicine but limited in throughput. By optically encoding calcium flux from an array of nanopores, parallel measurements from hundreds of nanopores were reported, while lateral drifts of biological nanopores set obstacles for signal processing. In this paper, optical single-channel recording (oSCR) serves to track nanopores with high precision and a general principle of nanopore motion kinetics is quantitatively investigated. By finely adjusting the osmosis-oriented interactions between the lipid/substrate interfaces, motions of nanopores could be controllably restricted. Improved signal-to-noise ratio is observed from motion-restricted nanopores, which is experimentally demonstrated. To systematically evaluate oSCR with asymmetric salt concentrations, a finite element method simulation is established. oSCR with an array of immobilized nanopores suggests new strategies for sequencing DNA by microscopic imaging in high throughput and is widely applicable to the investigation of other transmembrane proteins.
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Affiliation(s)
| | | | | | - Zidao Zeng
- Department of Chemistry , University of Pittsburgh , 219 Parkman Avenue , Pittsburgh , Pennsylvania 15260 , United States
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Annexin A5 is the Most Abundant Membrane-Associated Protein in Stereocilia but is Dispensable for Hair-Bundle Development and Function. Sci Rep 2016; 6:27221. [PMID: 27251877 PMCID: PMC4890179 DOI: 10.1038/srep27221] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 05/17/2016] [Indexed: 01/26/2023] Open
Abstract
The phospholipid- and Ca(2+)-binding protein annexin A5 (ANXA5) is the most abundant membrane-associated protein of ~P23 mouse vestibular hair bundles, the inner ear's sensory organelle. Using quantitative mass spectrometry, we estimated that ANXA5 accounts for ~15,000 copies per stereocilium, or ~2% of the total protein there. Although seven other annexin genes are expressed in mouse utricles, mass spectrometry showed that none were present at levels near ANXA5 in bundles and none were upregulated in stereocilia of Anxa5(-/-) mice. Annexins have been proposed to mediate Ca(2+)-dependent repair of membrane lesions, which could be part of the repair mechanism in hair cells after noise damage. Nevertheless, mature Anxa5(-/-) mice not only have normal hearing and balance function, but following noise exposure, they are identical to wild-type mice in their temporary or permanent changes in hearing sensitivity. We suggest that despite the unusually high levels of ANXA5 in bundles, it does not play a role in the bundle's key function, mechanotransduction, at least until after two months of age in the cochlea and six months of age in the vestibular system. These results reinforce the lack of correlation between abundance of a protein in a specific compartment or cellular structure and its functional significance.
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Shao C, Kendall E, DeVoe DL. Electro-optical BLM chips enabling dynamic imaging of ordered lipid domains. LAB ON A CHIP 2012; 12:3142-9. [PMID: 22728885 PMCID: PMC3411933 DOI: 10.1039/c2lc40077d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Studies of lipid rafts, ordered microdomains of sphingolipids and cholesterol within cell membranes, are essential in probing the relationships between membrane organization and cellular function. While in vitro studies of lipid phase separation are commonly performed using spherical vesicles as model membranes, the utility of these models is limited by a number of factors. Here we present a microfluidic device that supports simultaneous electrical measurements and confocal imaging of on-chip bilayer lipid membranes (BLMs), enabling real-time multi-domain imaging of membrane organization. The chips further support closed microfluidic access to both sides of the membrane, allowing the membrane boundary conditions to be rapidly changed and providing a mechanism for dynamically adjusting membrane curvature through application of a transmembrane pressure gradient. Here we demonstrate the platform through the study of dynamic generation and dissolution of ordered lipid domains as membrane components are transported to and from the supporting annulus containing solvated lipids and cholesterol.
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Affiliation(s)
- Chenren Shao
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
| | - Eric Kendall
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
| | - Don L. DeVoe
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
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Kusumi A, Fujiwara TK, Chadda R, Xie M, Tsunoyama TA, Kalay Z, Kasai RS, Suzuki KGN. Dynamic organizing principles of the plasma membrane that regulate signal transduction: commemorating the fortieth anniversary of Singer and Nicolson's fluid-mosaic model. Annu Rev Cell Dev Biol 2012; 28:215-50. [PMID: 22905956 DOI: 10.1146/annurev-cellbio-100809-151736] [Citation(s) in RCA: 284] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The recent rapid accumulation of knowledge on the dynamics and structure of the plasma membrane has prompted major modifications of the textbook fluid-mosaic model. However, because the new data have been obtained in a variety of research contexts using various biological paradigms, the impact of the critical conceptual modifications on biomedical research and development has been limited. In this review, we try to synthesize our current biological, chemical, and physical knowledge about the plasma membrane to provide new fundamental organizing principles of this structure that underlie every molecular mechanism that realizes its functions. Special attention is paid to signal transduction function and the dynamic aspect of the organizing principles. We propose that the cooperative action of the hierarchical three-tiered mesoscale (2-300 nm) domains--actin-membrane-skeleton induced compartments (40-300 nm), raft domains (2-20 nm), and dynamic protein complex domains (3-10 nm)--is critical for membrane function and distinguishes the plasma membrane from a classical Singer-Nicolson-type model.
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Affiliation(s)
- Akihiro Kusumi
- Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8507, Japan.
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Ide T. Simultaneous Optical and Electrical Recording of Single Molecule Bonding to Single Channel Proteins. Chemphyschem 2010; 11:3408-11. [DOI: 10.1002/cphc.201000560] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Yamamoto D, Uchihashi T, Kodera N, Yamashita H, Nishikori S, Ogura T, Shibata M, Ando T. High-Speed Atomic Force Microscopy Techniques for Observing Dynamic Biomolecular Processes. Methods Enzymol 2010; 475:541-64. [DOI: 10.1016/s0076-6879(10)75020-5] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Tabata KV, Sato K, Ide T, Nishizaka T, Nakano A, Noji H. Visualization of cargo concentration by COPII minimal machinery in a planar lipid membrane. EMBO J 2009; 28:3279-89. [PMID: 19763084 DOI: 10.1038/emboj.2009.269] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Accepted: 08/17/2009] [Indexed: 11/09/2022] Open
Abstract
Selective protein export from the endoplasmic reticulum is mediated by COPII vesicles. Here, we investigated the dynamics of fluorescently labelled cargo and non-cargo proteins during COPII vesicle formation using single-molecule microscopy combined with an artificial planar lipid bilayer. Single-molecule analysis showed that the Sar1p-Sec23/24p-cargo complex, but not the Sar1p-Sec23/24p complex, undergoes partial dimerization before Sec13/31p recruitment. On addition of a complete COPII mixture, cargo molecules start to assemble into fluorescent spots and clusters followed by vesicle release from the planar membrane. We show that continuous GTPase cycles of Sar1p facilitate cargo concentration into COPII vesicle buds, and at the same time, non-cargo proteins are excluded from cargo clusters. We propose that the minimal set of COPII components is required not only to concentrate cargo molecules, but also to mediate exclusion of non-cargo proteins from the COPII vesicles.
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Affiliation(s)
- Kazuhito V Tabata
- Department of Biomolecular Energetics, The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka, Japan
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Bayley H, Cronin B, Heron A, Holden MA, Hwang WL, Syeda R, Thompson J, Wallace M. Droplet interface bilayers. MOLECULAR BIOSYSTEMS 2008; 4:1191-208. [PMID: 19396383 DOI: 10.1039/b808893d] [Citation(s) in RCA: 355] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Droplet interface bilayers (DIBs) provide a superior platform for the biophysical analysis of membrane proteins. The versatile DIBs can also form networks, with features that include built-in batteries and sensors.
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Affiliation(s)
- Hagan Bayley
- Department of Chemistry, University of Oxford, Oxford, UK.
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Thompson JR, Heron AJ, Santoso Y, Wallace MI. Enhanced stability and fluidity in droplet on hydrogel bilayers for measuring membrane protein diffusion. NANO LETTERS 2007; 7:3875-3878. [PMID: 17979308 DOI: 10.1021/nl071943y] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We form artificial lipid bilayers suitable for single-molecule fluorescence microscopy by contacting an aqueous droplet with a hydrogel support immersed in a solution of lipid in oil. Our results show that droplet on hydrogel bilayers (DHBs) have high lipid mobilities, similar to those observed in unsupported lipid bilayers. DHBs are also stable over a period of several weeks. We examine membrane protein diffusion in these bilayers and report a decreased lateral mobility of the heptameric beta-barrel pore-forming toxin alpha-hemolysin versus that of its monomeric precursor. These results corroborate previous models of the alpha-hemolysin insertion mechanism where the monomer binds to the lipid bilayer without insertion.
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Affiliation(s)
- James R Thompson
- Physical and Theoretical Chemistry Laboratory, University of Oxford, Chemistry Research Laboratory, Oxford, UK
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Zagnoni M, Sandison ME, Marius P, Lee AG, Morgan H. Controlled delivery of proteins into bilayer lipid membranes on chip. LAB ON A CHIP 2007; 7:1176-83. [PMID: 17713617 PMCID: PMC2040492 DOI: 10.1039/b703818f] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The study and the exploitation of membrane proteins for drug screening applications requires a controllable and reliable method for their delivery into an artificial suspended membrane platform based on lab-on-a-chip technology. In this work, a polymeric device for forming lipid bilayers suitable for electrophysiology studies and biosensor applications is presented. The chip supports a single bilayer and is configured for controlled protein delivery through on-chip microfluidics. In order to demonstrate the principle of protein delivery, the potassium channel KcsA was reconstituted into proteoliposomes, which were then fused with the suspended bilayer on-chip. Fusion of single proteoliposomes with the membrane was identified electrically. Single channel conductance measurements of KcsA in the on-chip bilayer were recorded and these were compared to previously published data obtained with a conventional planar bilayer system.
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Affiliation(s)
- Michele Zagnoni
- NSI Group, School of Electronics and Computer Science, University of Southampton, Highfield, Southampton, UK. E-mail: ; Fax: +44 2380 593029; Tel: +44 2380 596782
| | - Mairi E. Sandison
- NSI Group, School of Electronics and Computer Science, University of Southampton, Highfield, Southampton, UK. E-mail: ; Fax: +44 2380 593029; Tel: +44 2380 596782
| | - Phedra Marius
- Division of Biochemistry and Molecular Biology, School of Biological Sciences, University of Southampton, Bolderwood, Southampton, UK
| | - Anthony G. Lee
- Division of Biochemistry and Molecular Biology, School of Biological Sciences, University of Southampton, Bolderwood, Southampton, UK
| | - Hywel Morgan
- NSI Group, School of Electronics and Computer Science, University of Southampton, Highfield, Southampton, UK. E-mail: ; Fax: +44 2380 593029; Tel: +44 2380 596782
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Immobilizing BK-channels in artificial lipid bilayers using annexin V. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2007. [DOI: 10.1380/ejssnt.2007.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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