1
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Reciprocating free-flow isoelectric focusing with online array ultraviolet detector for process monitoring of protein separation. J Chromatogr A 2022; 1663:462747. [PMID: 34973480 DOI: 10.1016/j.chroma.2021.462747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 12/06/2021] [Accepted: 12/11/2021] [Indexed: 11/22/2022]
Abstract
Free-flow isoelectric focusing (FFIEF) is a useful tool for separating and purifying proteins, DNA, cells, and organelles, etc. However, the online monitoring of each fraction during an FFIEF run has not been achieved yet, resulting in a lack of process monitoring of FFIEF. Herein, an online array ultraviolet (UV) detection system was developed for the easy assay of FFE fractions. The detector was integrated with an apparatus of FFIEF with 32 fractions to show the online monitoring, and bovine serum albumin (BSA) and lysozyme were chosen as the model proteins for manifesting the UV detector performance. The experiments revealed that (i) all the fluidic cells had good linearity from 0.03 to 10 mg/mL BSA and fair limits of detection (LODs) of 0.01 mg/mL; (ii) all the cells had good uniformity of UV absorbance; and (iii) the deviations of intra-day and inter-day of UV detector were respectively 3.8% and 5.8%, indicating the fair stability of the UV detector. The UV detector could be well used for the process monitoring of two model proteins through the whole FFIEF run, and the online absorbance assay of proteins at the end of FFIEF. The UV detector herein had the evident potential for rapid and convenient assay of protein fraction in FFIEF as well as other FFE modes.
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2
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Methods for the solubilisation of membrane proteins: the micelle-aneous world of membrane protein solubilisation. Biochem Soc Trans 2021; 49:1763-1777. [PMID: 34415288 PMCID: PMC8421053 DOI: 10.1042/bst20210181] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/02/2021] [Accepted: 08/03/2021] [Indexed: 12/14/2022]
Abstract
The solubilisation of membrane proteins (MPs) necessitates the overlap of two contradictory events; the extraction of MPs from their native lipid membranes and their subsequent stabilisation in aqueous environments. Whilst the current myriad of membrane mimetic systems provide a range of modus operandi, there are no golden rules for selecting the optimal pipeline for solubilisation of a specific MP hence a miscellaneous approach must be employed balancing both solubilisation efficiency and protein stability. In recent years, numerous diverse lipid membrane mimetic systems have been developed, expanding the pool of available solubilisation strategies. This review provides an overview of recent developments in the membrane mimetic field, with particular emphasis placed upon detergents, polymer-based nanodiscs and amphipols, highlighting the latest reagents to enter the toolbox of MP research.
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3
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Tassew NG, Laing ST, Shatz W, Crowell SR, Loyet KM, Schuetz C, Blanchette C. Fab-Nanolipoprotein Conjugate Causes Vitreous Opacity and Cataracts Following a Single Intravitreal Administration in New Zealand White Rabbits. Toxicol Pathol 2020; 49:647-655. [PMID: 33733956 DOI: 10.1177/0192623320969671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
One strategy employed to prolong the ocular half-life of large molecule therapeutics is via covalent attachment to a carrier, resulting in an increase in size thereby slowing their clearance from the eye. Rabbit antigen-binding fragment conjugated to nanolipoprotein (RabFab-NLP) is a novel conjugate intended to prolong ocular half-life through an increase in hydrodynamic radius compared to Fab alone (∼12 vs ∼3 nm). Nanolipoproteins are mimetics of endogenous high-density lipoproteins and consist of lipids and apolipoproteins (ApoE422k), both biologically derived materials. The objective of this study was to evaluate the ocular toxicity and toxicokinetics of RabFab-NLP after a single intravitreal administration in New Zealand White rabbits. Serum toxicokinetic data suggested a significant increase in ocular residence time of RabFab-NLP compared to RabFab alone. Ophthalmic examinations showed that RabFab-NLP caused vitreous and lens opacities as early as day 3 and day 8 postdose, respectively, which persisted for the entire study duration to day 30. The RabFab-NLP-related microscopic findings were present in the lens, vitreous cavity, and/or optic nerve head. Based on the observed ocular toxicity, a single intravitreal dose of 1.3 mg/eye RabFab-NLP was not tolerated and caused vitreous opacity and cataracts in rabbit eyes.
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Affiliation(s)
- Nardos G Tassew
- 7412Genentech Inc, Department of Safety Assessment, South San Francisco, CA, USA
| | - Steven T Laing
- 7412Genentech Inc, Department of Safety Assessment, South San Francisco, CA, USA
| | - Whitney Shatz
- 7412Genentech Inc, Protein Chemistry, South San Francisco, CA, USA
| | - Susan R Crowell
- 7412Genentech Inc, Department of Preclinical and Translational Pharmacokinetics & Pharmacodynamics, South San Francisco, CA, USA
| | - Kelly M Loyet
- 7412Genentech Inc, Department of Biochemical Cellular Pharmacology, South San Francisco, CA, USA
| | - Chris Schuetz
- 7412Genentech Inc, Department of Safety Assessment, South San Francisco, CA, USA
| | - Craig Blanchette
- 7412Genentech Inc, Protein Chemistry, South San Francisco, CA, USA
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4
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Darwish M, Shatz W, Leonard B, Loyet K, Barrett K, Wong JL, Li H, Abraham R, Lin M, Franke Y, Tam C, Mortara K, Zilberleyb I, Blanchette C. Nanolipoprotein Particles as a Delivery Platform for Fab Based Therapeutics. Bioconjug Chem 2020; 31:1995-2007. [DOI: 10.1021/acs.bioconjchem.0c00349] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Martine Darwish
- Genentech, South San Francisco, California 94088, United States
| | - Whitney Shatz
- Genentech, South San Francisco, California 94088, United States
| | - Brandon Leonard
- Genentech, South San Francisco, California 94088, United States
| | - Kelly Loyet
- Genentech, South San Francisco, California 94088, United States
| | - Kathy Barrett
- Genentech, South San Francisco, California 94088, United States
| | - Janice L. Wong
- Genentech, South San Francisco, California 94088, United States
| | - Hong Li
- Genentech, South San Francisco, California 94088, United States
| | - Ryan Abraham
- Genentech, South San Francisco, California 94088, United States
| | - May Lin
- Genentech, South San Francisco, California 94088, United States
| | - Yvonne Franke
- Genentech, South San Francisco, California 94088, United States
| | - Christine Tam
- Genentech, South San Francisco, California 94088, United States
| | - Kyle Mortara
- Genentech, South San Francisco, California 94088, United States
| | - Inna Zilberleyb
- Genentech, South San Francisco, California 94088, United States
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5
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Arter WE, Levin A, Krainer G, Knowles TPJ. Microfluidic approaches for the analysis of protein-protein interactions in solution. Biophys Rev 2020; 12:575-585. [PMID: 32266673 PMCID: PMC7242286 DOI: 10.1007/s12551-020-00679-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 03/02/2020] [Indexed: 12/15/2022] Open
Abstract
Exploration and characterisation of the human proteome is a key objective enabling a heightened understanding of biological function, malfunction and pharmaceutical design. Since proteins typically exhibit their behaviour by binding to other proteins, the challenge of probing protein-protein interactions has been the focus of new and improved experimental approaches. Here, we review recently developed microfluidic techniques for the study and quantification of protein-protein interactions. We focus on methodologies that utilise the inherent strength of microfluidics for the control of mass transport on the micron scale, to facilitate surface and membrane-free interrogation and quantification of interacting proteins. Thus, the microfluidic tools described here provide the capability to yield insights on protein-protein interactions under physiological conditions. We first discuss the defining principles of microfluidics, and methods for the analysis of protein-protein interactions that utilise the diffusion-controlled mixing characteristic of fluids at the microscale. We then describe techniques that employ electrophoretic forces to manipulate and fractionate interacting protein systems for their biophysical characterisation, before discussing strategies that use microdroplet compartmentalisation for the analysis of protein interactions. We conclude by highlighting future directions for the field, such as the integration of microfluidic experiments into high-throughput workflows for the investigation of protein interaction networks.
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Affiliation(s)
- William E Arter
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Aviad Levin
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Georg Krainer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Tuomas P J Knowles
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
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6
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Wang S, Zhang L, Sun H, Chu Z, Chen H, Zhao Y, Zhang W. Carrier ampholyte-free free-flow isoelectric focusing for separation of protein. Electrophoresis 2019; 40:2610-2617. [PMID: 30977523 DOI: 10.1002/elps.201900148] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Accepted: 04/06/2019] [Indexed: 01/20/2023]
Abstract
Free-flow isoelectric focusing (FFIEF) has the merits of mild separation conditions, high recovery and resolution, but suffers from the issues of ampholytes interference and high cost due to expensive carrier ampholytes. In this paper, a home-made carrier ampholyte-free FFIEF system was constructed via orientated migration of H+ and OH- provided by electrode solutions. When applying an electric field, a linear pH gradient from pH 4 to 9 (R2 = 0.994) was automatically formed by the electromigration of protons and hydroxyl ions in the separation chamber. The carrier ampholyte-free FFIEF system not only avoids interference of ampholyte to detection but also guarantees high separation resolution by establishing stable pH gradient. The separation selectivity was conveniently adjusted by controlling operating voltage and optimizing the composition, concentration and flow rate of the carrier buffer. The constructed system was applied to separation of proteins in egg white, followed by MADLI-TOF-MS identification. Three major proteins, ovomucoid, ovalbumin and ovotransferrin, were successfully separated according to their pI values with 15 mmol/L Tris-acetic acid (pH = 6.5) as carrier buffer at a flow rate of 12.9 mL/min.
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Affiliation(s)
- Shuai Wang
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
| | - Lingyi Zhang
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
| | - Haofan Sun
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
| | - Zhanying Chu
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
| | - Haihong Chen
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
| | - Yameng Zhao
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
| | - Weibing Zhang
- Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, P. R. China
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7
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Abstract
Membrane proteins play a most important part in metabolism, signaling, cell motility, transport, development, and many other biochemical and biophysical processes which constitute fundamentals of life on the molecular level. Detailed understanding of these processes is necessary for the progress of life sciences and biomedical applications. Nanodiscs provide a new and powerful tool for a broad spectrum of biochemical and biophysical studies of membrane proteins and are commonly acknowledged as an optimal membrane mimetic system that provides control over size, composition, and specific functional modifications on the nanometer scale. In this review we attempted to combine a comprehensive list of various applications of nanodisc technology with systematic analysis of the most attractive features of this system and advantages provided by nanodiscs for structural and mechanistic studies of membrane proteins.
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Affiliation(s)
- Ilia G Denisov
- Department of Biochemistry and Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States
| | - Stephen G Sligar
- Department of Biochemistry and Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States
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8
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Gilmore SF, Blanchette CD, Scharadin TM, Hura GL, Rasley A, Corzett M, Pan CX, Fischer NO, Henderson PT. Lipid Cross-Linking of Nanolipoprotein Particles Substantially Enhances Serum Stability and Cellular Uptake. ACS APPLIED MATERIALS & INTERFACES 2016; 8:20549-20557. [PMID: 27411034 DOI: 10.1021/acsami.6b04609] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanolipoprotein particles (NLPs) consist of a discoidal phospholipid lipid bilayer confined by an apolipoprotein belt. NLPs are a promising platform for a variety of biomedical applications due to their biocompatibility, size, definable composition, and amphipathic characteristics. However, poor serum stability hampers the use of NLPs for in vivo applications such as drug formulation. In this study, NLP stability was enhanced upon the incorporation and subsequent UV-mediated intermolecular cross-linking of photoactive DiynePC phospholipids in the lipid bilayer, forming cross-linked nanoparticles (X-NLPs). Both the concentration of DiynePC in the bilayer and UV exposure time significantly affected the resulting X-NLP stability in 100% serum, as assessed by size exclusion chromatography (SEC) of fluorescently labeled particles. Cross-linking did not significantly impact the size of X-NLPs as determined by dynamic light scattering and SEC. X-NLPs had essentially no degradation over 48 h in 100% serum, which is a drastic improvement compared to non-cross-linked NLPs (50% degradation by ∼10 min). X-NLPs had greater uptake into the human ATCC 5637 bladder cancer cell line compared to non-cross-linked particles, indicating their potential utility for targeted drug delivery. X-NLPs also exhibited enhanced stability following intravenous administration in mice. These results collectively support the potential utility of X-NLPs for a variety of in vivo applications.
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Affiliation(s)
- Sean F Gilmore
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory , Livermore, California 94551, United States
| | - Craig D Blanchette
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory , Livermore, California 94551, United States
| | - Tiffany M Scharadin
- Department of Internal Medicine, Division of Hematology and Oncology, University of California-Davis (UC Davis) and UC Davis Comprehensive Cancer Center , 4501 X Street, Room 3016, Sacramento, California 95817, United States
| | - Greg L Hura
- Life Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Chemistry and Biochemistry, University of California-Santa Cruz , Santa Cruz, California 95064, United States
| | - Amy Rasley
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory , Livermore, California 94551, United States
| | - Michele Corzett
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory , Livermore, California 94551, United States
| | - Chong-Xian Pan
- Department of Internal Medicine, Division of Hematology and Oncology, University of California-Davis (UC Davis) and UC Davis Comprehensive Cancer Center , 4501 X Street, Room 3016, Sacramento, California 95817, United States
| | - Nicholas O Fischer
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory , Livermore, California 94551, United States
| | - Paul T Henderson
- Department of Internal Medicine, Division of Hematology and Oncology, University of California-Davis (UC Davis) and UC Davis Comprehensive Cancer Center , 4501 X Street, Room 3016, Sacramento, California 95817, United States
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9
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Eichacker LA, Weber G, Sukop-Köppel U, Wildgruber R. Free flow electrophoresis for separation of native membrane protein complexes. Methods Mol Biol 2015; 1295:415-25. [PMID: 25820737 DOI: 10.1007/978-1-4939-2550-6_29] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
This chapter describes the technology of free flow electrophoresis (FFE) and protocols to separate membrane protein complexes for proteome analysis. FFE is a highly versatile technology applied in the field of protein analysis. It is superior to native PAGE due to its fast continuous processing of sample at high resolution. Additionally, the dynamic separation range from ions, peptides, to proteins, protein complexes, up to organelles, and whole cells makes it the method of choice in the analysis of proteins. FFE is carried out in an aqueous medium without inducing any solid matrix, such as acrylamide, so that it simplifies the analysis of protein complexes for the downstream analysis. Here, we describe the novel zone electrophoresis interval method (IZE-FFE) for separation of protein complexes from the thylakoid membrane of Arabidopsis thaliana by charge only. Protein complexes isolated by IZE FFE were characterized according to molecular weight by Blue Native PAGE and were proteins stained with coomassie.
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Affiliation(s)
- Lutz Andreas Eichacker
- Center of Organelle Research (CORE), University of Stavanger, Richard Johnsensgate 4, 4036, Stavanger, Norway
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10
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Yang CZ, Yan J, Zhang Q, Guo CG, Kong FZ, Cao CX, Fan LY, Jin XQ. Negative-pressure-induced collector for a self-balance free-flow electrophoresis device. J Sep Sci 2014; 37:1359-63. [PMID: 24648284 DOI: 10.1002/jssc.201400007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 03/12/2014] [Accepted: 03/13/2014] [Indexed: 11/10/2022]
Abstract
Uneven flow in free-flow electrophoresis (FFE) with a gravity-induced fraction collector caused by air bubbles in outlets and/or imbalance of the surface tension of collecting tubes would result in a poor separation. To solve these issues, this work describes a novel collector for FFE. The collector is composed of a self-balance unit, multisoft pipe flow controller, fraction collector, and vacuum pump. A negative pressure induced continuous air flow rapidly flowed through the self-balance unit, taking the background electrolyte and samples into the fraction collector. The developed collector has the following advantages: (i) supplying a stable and harmonious hydrodynamic environment in the separation chamber for FFE separation, (ii) effectively preventing background electrolyte and sample flow-back at the outlet of the chamber and improving the resolution, (iii) increasing the preparative scale of the separation, and (iv) simplifying the operation. In addition, the cost of the FFE device was reduced without using a multichannel peristaltic pump for sample collection. Finally, comparative FFE experiments on dyes, proteins, and cells were carried out. It is evident that the new developed collector could overcome the problems inherent in the previous gravity-induced self-balance collector.
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Affiliation(s)
- Cheng-Zhang Yang
- Laboratory of Analytical Biochemistry and Bioseparation, Key State Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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11
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Fischer NO, Weilhammer DR, Dunkle A, Thomas C, Hwang M, Corzett M, Lychak C, Mayer W, Urbin S, Collette N, Chiun Chang J, Loots GG, Rasley A, Blanchette CD. Evaluation of nanolipoprotein particles (NLPs) as an in vivo delivery platform. PLoS One 2014; 9:e93342. [PMID: 24675794 PMCID: PMC3968139 DOI: 10.1371/journal.pone.0093342] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 03/05/2014] [Indexed: 12/05/2022] Open
Abstract
Nanoparticles hold great promise for the delivery of therapeutics, yet limitations remain with regards to the use of these nanosystems for efficient long-lasting targeted delivery of therapeutics, including imparting functionality to the platform, in vivo stability, drug entrapment efficiency and toxicity. To begin to address these limitations, we evaluated the functionality, stability, cytotoxicity, toxicity, immunogenicity and in vivo biodistribution of nanolipoprotein particles (NLPs), which are mimetics of naturally occurring high-density lipoproteins (HDLs). We found that a wide range of molecules could be reliably conjugated to the NLP, including proteins, single-stranded DNA, and small molecules. The NLP was also found to be relatively stable in complex biological fluids and displayed no cytotoxicity in vitro at doses as high as 320 µg/ml. In addition, we observed that in vivo administration of the NLP daily for 14 consecutive days did not induce significant weight loss or result in lesions on excised organs. Furthermore, the NLPs did not display overt immunogenicity with respect to antibody generation. Finally, the biodistribution of the NLP in vivo was found to be highly dependent on the route of administration, where intranasal administration resulted in prolonged retention in the lung tissue. Although only a select number of NLP compositions were evaluated, the findings of this study suggest that the NLP platform holds promise for use as both a targeted and non-targeted in vivo delivery vehicle for a range of therapeutics.
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MESH Headings
- Administration, Intranasal
- Animals
- Antigens, Bacterial/chemistry
- Antigens, Bacterial/genetics
- Antigens, Bacterial/metabolism
- Apolipoprotein E4/chemistry
- Apolipoprotein E4/genetics
- Apolipoprotein E4/metabolism
- Biomimetic Materials/chemical synthesis
- Biomimetic Materials/pharmacokinetics
- DNA, Bacterial/chemistry
- DNA, Bacterial/metabolism
- DNA, Single-Stranded/metabolism
- Dimyristoylphosphatidylcholine/chemistry
- Dimyristoylphosphatidylcholine/metabolism
- Drug Carriers
- Drug Stability
- Escherichia coli/genetics
- Escherichia coli/metabolism
- Female
- Fluorescent Dyes
- Lipoproteins, HDL/chemical synthesis
- Lipoproteins, HDL/pharmacokinetics
- Male
- Mice
- Mice, Inbred BALB C
- Nanoparticles/chemistry
- Nanoparticles/toxicity
- Particle Size
- Phosphatidylcholines/chemistry
- Phosphatidylcholines/metabolism
- Pore Forming Cytotoxic Proteins/chemistry
- Pore Forming Cytotoxic Proteins/genetics
- Pore Forming Cytotoxic Proteins/metabolism
- Recombinant Proteins/chemistry
- Recombinant Proteins/genetics
- Recombinant Proteins/metabolism
- Tissue Distribution
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Affiliation(s)
- Nicholas O. Fischer
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Dina R. Weilhammer
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Alexis Dunkle
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Cynthia Thomas
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Mona Hwang
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Michele Corzett
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Cheri Lychak
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Wasima Mayer
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Salustra Urbin
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Nicole Collette
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
| | - Jiun Chiun Chang
- School of Natural Sciences, University of California Merced, Merced, California, United States of America
| | - Gabriela G. Loots
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
- School of Natural Sciences, University of California Merced, Merced, California, United States of America
| | - Amy Rasley
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
- * E-mail: (AR); (CB)
| | - Craig D. Blanchette
- Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, California, United States of America
- * E-mail: (AR); (CB)
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12
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Pomorski TG, Nylander T, Cárdenas M. Model cell membranes: discerning lipid and protein contributions in shaping the cell. Adv Colloid Interface Sci 2014; 205:207-20. [PMID: 24268587 DOI: 10.1016/j.cis.2013.10.028] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 10/24/2013] [Accepted: 10/24/2013] [Indexed: 01/01/2023]
Abstract
The high complexity of biological membranes has motivated the development and application of a wide range of model membrane systems to study biochemical and biophysical aspects of membranes in situ under well defined conditions. The aim is to provide fundamental understanding of processes controlled by membrane structure, permeability and curvature as well as membrane proteins by using a wide range of biochemical, biophysical and microscopic techniques. This review gives an overview of some currently used model biomembrane systems. We will also discuss some key membrane protein properties that are relevant for protein-membrane interactions in terms of protein structure and how it is affected by membrane composition, phase behavior and curvature.
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Affiliation(s)
- Thomas Günther Pomorski
- Centre for Membrane Pumps in Cells and Disease-PUMPKIN, Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
| | - Tommy Nylander
- Department of Chemistry, Division of Physical Chemistry, Lund University, Gettingevägen 60, SE-22100 Lund, Sweden
| | - Marité Cárdenas
- Department of Chemistry/Nano-Science Center, University of Copenhagen, DK-2100 Copenhagen, Denmark.
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13
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Yan J, Guo CG, Liu XP, Kong FZ, Shen QY, Yang CZ, Li J, Cao CX, Jin XQ. A simple and highly stable free-flow electrophoresis device with thermoelectric cooling system. J Chromatogr A 2013; 1321:119-26. [DOI: 10.1016/j.chroma.2013.10.058] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 10/01/2013] [Accepted: 10/18/2013] [Indexed: 11/26/2022]
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14
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Wildgruber R, Weber G, Wise P, Grimm D, Bauer J. Free-flow electrophoresis in proteome sample preparation. Proteomics 2013; 14:629-36. [PMID: 24123730 DOI: 10.1002/pmic.201300253] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 08/07/2013] [Accepted: 08/23/2013] [Indexed: 02/01/2023]
Abstract
An aim of proteome research is to identify the entire complement of proteins expressed in defined cell types of humans, animals, plants, and microorganisms. The approach requires searching for low abundant or even rarely expressed proteins in many cell types, as well as the determination of the protein expression levels in subcellular compartments and organelles. In recent years, rather powerful MS technologies have been developed. At this stage of MS device development, it is of highest interest to purify intact cell types or isolate subcellular compartments, where the proteins of interest are originating from, which determine the final composition of a peptide mixture. Free-flow electrophoresis proved to be useful to prepare meaningful peptide mixtures because of its improved capabilities in particle electrophoresis and the enhanced resolution in protein separation. Sample preparation by free-flow electrophoresis mediated particle separation was preferentially performed for purification of either organelles and their subspecies or major protein complexes. Especially, the introduction of isotachophoresis and interval zone electrophoresis improved the purity of the gained analytes of interest. In addition, free-flow IEF proved to be helpful, when proteins of low solubility, obtained, e.g. from cell membranes, were investigated.
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