1
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Wulandari DA, Tsuru K, Minamihata K, Wakabayashi R, Egami G, Kawabe Y, Kamihira M, Goto M, Kamiya N. Design and validation of functionalized redox-responsive hydrogel beads for high-throughput screening of antibody-secreting mammalian cells. J Biosci Bioeng 2024; 138:89-95. [PMID: 38644063 DOI: 10.1016/j.jbiosc.2024.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 04/02/2024] [Accepted: 04/02/2024] [Indexed: 04/23/2024]
Abstract
Antibody drugs play a vital role in diagnostics and therapy. However, producing antibodies from mammalian cells is challenging owing to cellular heterogeneity, which can be addressed by applying droplet-based microfluidic platforms for high-throughput screening (HTS). Here, we designed an integrated system based on disulfide-bonded redox-responsive hydrogel beads (redox-HBs), which were prepared through enzymatic hydrogelation, to compartmentalize, screen, select, retrieve, and recover selected Chinese hamster ovary (CHO) cells secreting high levels of antibodies. Moreover, redox-HBs were functionalized with protein G as an antibody-binding module to capture antibodies secreted from encapsulated cells. As proof-of-concept, cells co-producing immunoglobulin G (IgG) as the antibody and green fluorescent protein (GFP) as the reporter molecule, denoted as CHO(IgG/GFP), were encapsulated into functionalized redox-HBs. Additionally, antibody-secreting cells were labeled with protein L-conjugated horseradish peroxidase using a tyramide amplification system, enabling fluorescence staining of the antibody captured inside the beads. Redox-HBs were then applied to fluorescence-activated droplet sorting, and selected redox-HBs were degraded by reducing the disulfide bonds to recover the target cells. The results indicated the potential of the developed HTS platform for selecting a single cell viable for biopharmaceutical production.
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Affiliation(s)
- Diah Anggraini Wulandari
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kyosuke Tsuru
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kosuke Minamihata
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Rie Wakabayashi
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Go Egami
- Department of Chemical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoshinori Kawabe
- Department of Chemical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masamichi Kamihira
- Department of Chemical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masahiro Goto
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; Division of Biotechnology, Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Noriho Kamiya
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; Division of Biotechnology, Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
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2
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Ma Y, Xiang Y, Li X, Zhang D, Chen Q. Recombinant streptococcal protein G-modified metal-organic framework ZIF-8 for the highly selective purification of immunoglobulin G from human serum. Anal Chim Acta 2024; 1288:342175. [PMID: 38220305 DOI: 10.1016/j.aca.2023.342175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/28/2023] [Accepted: 12/21/2023] [Indexed: 01/16/2024]
Abstract
A novel solid phase extractant His-rSPG@ZIF-8 was prepared by covalently coupling recombinant streptococcal protein G (His-rSPG) with ZIF-8. The His-rSPG@ZIF-8 composite was characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Due to the specific binding between the immunoglobulin binding region of His-rSPG and the Fc region of immunoglobulin G (IgG), the His-rSPG@ZIF-8 composite demonstrated exceptional selectivity in adsorbing IgG. In Britton-Robinson buffer (BR buffer) with a salt concentration of 500 mmol L-1 (0.04 mol L-1, pH 8.0), the His-rSPG@ZIF-8 composite exhibited a remarkable adsorption efficiency of 99.8 % for 0.05 mg of the composite on 200 μL of IgG solution (100 μg mL-1). The adsorption behavior of the His-rSPG@ZIF-8 composite aligns with the Langmuir adsorption model, and the theoretical maximum adsorption capacity is 1428.6 mg g-1. The adsorbed IgG molecules were successfully eluted using a SDS solution (0.5 %, m/m), resulting in a recovery rate of 91.2 %. Indeed, the His-rSPG@ZIF-8 composite was successfully utilized for the isolation and purification of IgG from human serum samples. The obtained IgG exhibited high purity, as confirmed by SDS-PAGE analysis. Additionally, LC-MS/MS analysis was employed to identify the human serum proteins following the adsorption and elution process using the His-rSPG@ZIF-8 composite material. The results revealed that the recovered solution contained an impressive content of immunoglobulin, accounting for 62.4 % of the total protein content. Furthermore, this process also led to the significant enrichment of low abundance proteins such as Serpin B4 and Cofilin-1. Consequently, the His-rSPG@ZIF-8 composite holds great promise for applications such as IgG purification and immunoassays. At the same time, it expands the application of metal-organic frameworks in the field of proteomics.
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Affiliation(s)
- Yufei Ma
- School of Pharmacy, Shenyang Medical College, Shenyang, 110034, People's Republic of China
| | - Yuhan Xiang
- School of Pharmacy, Shenyang Medical College, Shenyang, 110034, People's Republic of China
| | - Xin Li
- Department of Science and Technology, Shenyang Medical College, Shenyang, 110034, People's Republic of China.
| | - Dandan Zhang
- School of Public Health, Shenyang Medical College, Shenyang, 110034, People's Republic of China.
| | - Qing Chen
- School of Pharmacy, Shenyang Medical College, Shenyang, 110034, People's Republic of China.
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3
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Wulandari DA, Tsuru K, Minamihata K, Wakabayashi R, Goto M, Kamiya N. A Functional Hydrogel Bead-Based High-Throughput Screening System for Mammalian Cells with Enhanced Secretion of Therapeutic Antibodies. ACS Biomater Sci Eng 2024; 10:628-636. [PMID: 38048166 DOI: 10.1021/acsbiomaterials.3c01386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
Droplet-based high-throughput screening systems are an emerging technology that provides a quick test to screen millions of cells with distinctive characteristics. Biopharmaceuticals, specifically therapeutic proteins, are produced by culturing cells that secrete heterologous recombinant proteins with different populations and expression levels; therefore, a technology to discriminate cells that produce more target proteins is needed. Here, we present a droplet-based microfluidic strategy for encapsulating, screening, and selecting target cells with redox-responsive hydrogel beads (HBs). As a proof-of-concept study, we demonstrate the enrichment of hybridoma cells with enhanced capability of antibody secretion using horseradish peroxidase (HRP)-catalyzed hydrogelation of tetra-thiolate poly(ethylene glycol); hybridoma cells were encapsulated in disulfide-bonded HBs. Recombinant protein G or protein M with a C-terminal cysteine residue was installed in the HBs via disulfide bonding to capture antibodies secreted from the cells. HBs were fluorescently stained by adding the protein L-HRP conjugate using a tyramide signal amplification system. HBs were then separated by fluorescence-activated droplet sorting and degraded by reducing the disulfide bonds to recover the target cells. Finally, we succeeded in the selection of hybridoma cells with enhanced antibody secretion, indicating the potential of this system in the therapeutic protein production.
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Affiliation(s)
- Diah Anggraini Wulandari
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kyosuke Tsuru
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kosuke Minamihata
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Rie Wakabayashi
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masahiro Goto
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Division of Biotechnology, Centre for Future Chemistry, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Noriho Kamiya
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Division of Biotechnology, Centre for Future Chemistry, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka 819-0395, Japan
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4
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Gelman S, Fahlberg SA, Heinzelman P, Romero PA, Gitter A. Neural networks to learn protein sequence-function relationships from deep mutational scanning data. Proc Natl Acad Sci U S A 2021; 118:e2104878118. [PMID: 34815338 PMCID: PMC8640744 DOI: 10.1073/pnas.2104878118] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2021] [Indexed: 11/18/2022] Open
Abstract
The mapping from protein sequence to function is highly complex, making it challenging to predict how sequence changes will affect a protein's behavior and properties. We present a supervised deep learning framework to learn the sequence-function mapping from deep mutational scanning data and make predictions for new, uncharacterized sequence variants. We test multiple neural network architectures, including a graph convolutional network that incorporates protein structure, to explore how a network's internal representation affects its ability to learn the sequence-function mapping. Our supervised learning approach displays superior performance over physics-based and unsupervised prediction methods. We find that networks that capture nonlinear interactions and share parameters across sequence positions are important for learning the relationship between sequence and function. Further analysis of the trained models reveals the networks' ability to learn biologically meaningful information about protein structure and mechanism. Finally, we demonstrate the models' ability to navigate sequence space and design new proteins beyond the training set. We applied the protein G B1 domain (GB1) models to design a sequence that binds to immunoglobulin G with substantially higher affinity than wild-type GB1.
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Affiliation(s)
- Sam Gelman
- Department of Computer Sciences, University of Wisconsin–Madison, Madison, WI 53706
- Morgridge Institute for Research, Madison, WI 53715
| | - Sarah A. Fahlberg
- Department of Biochemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Pete Heinzelman
- Department of Biochemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Philip A. Romero
- Department of Biochemistry, University of Wisconsin–Madison, Madison, WI 53706
| | - Anthony Gitter
- Department of Computer Sciences, University of Wisconsin–Madison, Madison, WI 53706
- Morgridge Institute for Research, Madison, WI 53715
- Department of Biostatistics and Medical Informatics, University of Wisconsin–Madison, Madison, WI 53792
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5
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Sutarlie L, Siak-Wie Ow D, Kong Ng S, Yang Y, Su X. Gold Nanoparticle-based "Mix and Measure" Fluorimetric Assays to Quantify Antibody Titer. Chem Asian J 2021; 16:3188-3193. [PMID: 34423583 DOI: 10.1002/asia.202100717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/14/2021] [Indexed: 11/07/2022]
Abstract
Monoclonal antibodies (mAbs) for treatment of human diseases are typically human or humanized Immunoglobulin G (IgG) produced in mammalian cell lines. A rapid, less tedious, and high throughput method to quantify mAbs is in demand to accelerate mAb production efficiency. To quantify mAb titer, we developed gold nanoparticle (AuNPs)-based "mix and measure" fluorimetric assays by exploiting AuNPs' fluorescence quenching ability. The AuNPs are functionalized by an Fc binding protein, i. e. protein G, which binds human IgG and fluorescently labeled rat IgG (Alexa Fluor 488-rat IgG) with differential affinity. The assays can be in competition or displacement format. The competitive binding of human IgG drug and the labelled rat IgG to protein G-coated AuNP lead to varied fluorescent intensity that is proportional to the amount of human IgG analte; or the displacement of the labelled rat IgG from protein G-coated AuNP by human IgG can lead to fluorescent recovery that is also proportionally related to human IgG concentration. The assays can quantify therapeutic mAbs in the range of 10-1,000 mg/L, demonstrated for Herceptin, Avastin, and Humira in cell culture media. The assays have fast turn over time (within 15 min). They can be performed in microplates and are suitable for high throughput "on-line" or "at-line" measurement in mAbs production lines.
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Affiliation(s)
- Laura Sutarlie
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, 138634, Singapore, Singapore
| | - Dave Siak-Wie Ow
- Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, 138668, Singapore, Singapore
| | - Say Kong Ng
- Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, 138668, Singapore, Singapore
| | - Yuansheng Yang
- Bioprocessing Technology Institute (BTI), Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, 138668, Singapore, Singapore
| | - Xiaodi Su
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, 138634, Singapore, Singapore
- Department of Chemistry, National University of Singapore, Block S8, level 3, 3 Science Drive 3, 117543, Singapore, Singapore
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6
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Rajale T, Miner JC, Michalczyk R, Phipps ML, Schmidt JG, Gilbertson RD, Williams RF, Strauss CEM, Martinez JS. Conformational control via sequence for a heteropeptoid in water: coupled NMR and Rosetta modelling. Chem Commun (Camb) 2021; 57:9922-9925. [PMID: 34498621 DOI: 10.1039/d1cc01992a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We report a critical advance in the generation and characterization of peptoid hetero-oligomers. A library of sub-monomers with amine and carboxylate side-chains are combined in different sequences using microwave-assisted synthesis. Their sequence-structure propensity is confirmed by circular dichroism, and conformer subtypes are enumerated by NMR. Biasing the ψ-angle backbone to trans (180°) in Monte Carlo modelling favors i to i + 3 naphthyl-naphthyl stacking, and matches experimental ensemble distributions. Taken together, high-yield synthesis of heterooligomers and NMR with structure prediction enables rapid determination of sequences that induce secondary structural propensities for predictive design of hydrophilic peptidomimetic foldamers and their future libraries.
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Affiliation(s)
- Trideep Rajale
- Center for Integrated Nanotechnologies, (CINT), Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Jacob C Miner
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.,Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Ryszard Michalczyk
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - M Lisa Phipps
- Center for Integrated Nanotechnologies, (CINT), Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Jurgen G Schmidt
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Robert D Gilbertson
- Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Robert F Williams
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Charlie E M Strauss
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
| | - Jennifer S Martinez
- Center for Materials Interfaces in Research and Applications, Northern Arizona University, Flagstaff, Arizona 86011, USA. .,Department of Applied Physics and Materials Science, Northern Arizona University, Flagstaff, Arizona 86011, USA
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7
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Jha RK, Yankey A, Shabazz K, Naranjo L, Shin SM, Velappan N, Bradbury ARM, Strauss CEM. Engineered pH-Sensitive Protein G/IgG Interaction. ACS Chem Biol 2021; 16:1142-1146. [PMID: 34152722 DOI: 10.1021/acschembio.0c00943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While natural protein-protein interactions have evolved to be induced by complex stimuli, rational design of interactions that can be switched-on-demand still remain challenging in the protein design world. Here, we demonstrate that a computationally redesigned natural interface for improved binding affinity could further be mutated to adopt a pH switchable interaction. The redesigned interface of Protein G/human IgG Fc domain (referred to as PrG/hIgG), when incorporated with histidine and glutamic acid on PrG (PrG-EHHE), showed a switch in binding affinity by 50-fold when the pH was altered from mild acidic to mild basic. The wild-type (WT) interface showed a negligible switch. The overall binding affinity under mild acidic pH for PrG-EHHE outperformed the wild-type PrG (PrG-WT) interaction. The new reagent PrG-EHHE can be revolutionary in IgG purification, since the standard method of using an extreme acidic pH for elution can be circumvented.
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Affiliation(s)
- Ramesh K. Jha
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Allison Yankey
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Kalifa Shabazz
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Leslie Naranjo
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Sang-Min Shin
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Nileena Velappan
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Andrew R. M. Bradbury
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Charlie E. M. Strauss
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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8
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Abstract
In the past 30 years, highly specific drugs, known as antibodies, have conquered the biopharmaceutical market. In addition to monoclonal antibodies (mAbs), antibody fragments are successfully applied. However, recombinant production faces challenges. Process analytical tools for monitoring and controlling production processes are scarce and time-intensive. In the downstream process (DSP), affinity ligands are established as the primary and most important step, while the application of other methods is challenging. The use of these affinity ligands as monitoring tools would enable a platform technology to monitor process steps in the USP and DSP. In this review, we highlight the current applications of affinity ligands (proteins A, G, and L) and discuss further applications as process analytical tools.
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9
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Song H, Bremer BJ, Hinds EC, Raskutti G, Romero PA. Inferring Protein Sequence-Function Relationships with Large-Scale Positive-Unlabeled Learning. Cell Syst 2020; 12:92-101.e8. [PMID: 33212013 DOI: 10.1016/j.cels.2020.10.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 08/13/2020] [Accepted: 10/22/2020] [Indexed: 10/22/2022]
Abstract
Machine learning can infer how protein sequence maps to function without requiring a detailed understanding of the underlying physical or biological mechanisms. It is challenging to apply existing supervised learning frameworks to large-scale experimental data generated by deep mutational scanning (DMS) and related methods. DMS data often contain high-dimensional and correlated sequence variables, experimental sampling error and bias, and the presence of missing data. Notably, most DMS data do not contain examples of negative sequences, making it challenging to directly estimate how sequence affects function. Here, we develop a positive-unlabeled (PU) learning framework to infer sequence-function relationships from large-scale DMS data. Our PU learning method displays excellent predictive performance across ten large-scale sequence-function datasets, representing proteins of different folds, functions, and library types. The estimated parameters pinpoint key residues that dictate protein structure and function. Finally, we apply our statistical sequence-function model to design highly stabilized enzymes.
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Affiliation(s)
- Hyebin Song
- Department of Statistics, The Pennsylvania State University, State College, PA 16802, USA; Department of Statistics, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Bennett J Bremer
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Emily C Hinds
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Garvesh Raskutti
- Department of Statistics, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Philip A Romero
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA; Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
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10
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Korodi M, Rákosi K, Baibarac M, Fejer SN. Reusable on-plate immunoprecipitation method with covalently immobilized antibodies on a protein G covered microtiter plate. J Immunol Methods 2020; 483:112812. [PMID: 32569597 DOI: 10.1016/j.jim.2020.112812] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 02/17/2020] [Accepted: 06/16/2020] [Indexed: 01/19/2023]
Abstract
Covalent immobilization of antibodies to protein G beads is a basic molecular biology method, although the beads present poor recovery results. Our aim was to reuse the immobilized antibody-protein G complex on a very small scale, therefore we optimized the crosslinking procedure to be used on the wells of a standard 96-well microplate. The method used involves the affinity binding of the antibody to the protein G surface, followed by the immobilization step using different crosslinking reagents, DMP and BS3, quenching the crosslinking reaction, and binding the antibody-specific antigen. By scaling down the procedure, we were able to reuse the anti-EGFR crosslinked wells more than 20 times. This method can be used to perform assays on a wide range of solid supports containing the protein G in an immobilized form, including functionalized nanosensors, for immunoprecipitation, protein and cell lysate purification, target protein enrichment.
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Affiliation(s)
- Mónika Korodi
- Pro-Vitam Ltd., Muncitorilor Street 16, RO-520032 Sfantu Gheorghe, Romania; University of Pécs, Department of Chemistry, Department of Chemistry, Faculty of Sciences, Ifjúság Street 6, H-7624 Pécs, Hungary
| | - Kinga Rákosi
- Pro-Vitam Ltd., Muncitorilor Street 16, RO-520032 Sfantu Gheorghe, Romania
| | - Mihaela Baibarac
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor street 405A, P.O.Box MG-7, R077125 Bucharest, Romania
| | - Szilard N Fejer
- Pro-Vitam Ltd., Muncitorilor Street 16, RO-520032 Sfantu Gheorghe, Romania; University of Pécs, Department of Chemistry, Department of Chemistry, Faculty of Sciences, Ifjúság Street 6, H-7624 Pécs, Hungary.
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11
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Meers MP, Bryson TD, Henikoff JG, Henikoff S. Improved CUT&RUN chromatin profiling tools. eLife 2019; 8:e46314. [PMID: 31232687 PMCID: PMC6598765 DOI: 10.7554/elife.46314] [Citation(s) in RCA: 246] [Impact Index Per Article: 49.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 06/22/2019] [Indexed: 02/07/2023] Open
Abstract
Previously, we described a novel alternative to chromatin immunoprecipitation, CUT&RUN, in which unfixed permeabilized cells are incubated with antibody, followed by binding of a protein A-Micrococcal Nuclease (pA/MNase) fusion protein (Skene and Henikoff, 2017). Here we introduce three enhancements to CUT&RUN: A hybrid protein A-Protein G-MNase construct that expands antibody compatibility and simplifies purification, a modified digestion protocol that inhibits premature release of the nuclease-bound complex, and a calibration strategy based on carry-over of E. coli DNA introduced with the fusion protein. These new features, coupled with the previously described low-cost, high efficiency, high reproducibility and high-throughput capability of CUT&RUN make it the method of choice for routine epigenomic profiling.
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Affiliation(s)
- Michael P Meers
- Basic Sciences DivisionFred Hutchinson Cancer Research CenterSeattleUnited States
| | - Terri D Bryson
- Basic Sciences DivisionFred Hutchinson Cancer Research CenterSeattleUnited States
- Howard Hughes Medical InstituteUnited States
| | - Jorja G Henikoff
- Basic Sciences DivisionFred Hutchinson Cancer Research CenterSeattleUnited States
| | - Steven Henikoff
- Basic Sciences DivisionFred Hutchinson Cancer Research CenterSeattleUnited States
- Howard Hughes Medical InstituteUnited States
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12
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Schlichthaerle T, Ganji M, Auer A, Kimbu Wade O, Jungmann R. Bacterially Derived Antibody Binders as Small Adapters for DNA-PAINT Microscopy. Chembiochem 2019; 20:1032-1038. [PMID: 30589198 DOI: 10.1002/cbic.201800743] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Indexed: 12/21/2022]
Abstract
Current optical super-resolution implementations are capable of resolving features spaced just a few nanometers apart. However, translating this spatial resolution to cellular targets is limited by the large size of traditionally employed primary and secondary antibody reagents. Recent advancements in small and efficient protein binders for super-resolution microscopy, such as nanobodies or aptamers, provide an exciting avenue for the future; however, their widespread availability is still limited. To address this issue, here we report the combination of bacterial-derived binders commonly used in antibody purification with DNA-based point accumulation for imaging in nanoscale topography (DNA-PAINT) microscopy. The small sizes of these protein binders, relative to secondary antibodies, make them an attractive labeling alternative for emerging superresolution techniques. We present here a labeling protocol for DNA conjugation of bacterially derived proteins A and G for DNA-PAINT, having assayed their intracellular performance by targeting primary antibodies against tubulin, TOM20, and the epidermal growth factor receptor (EGFR) and quantified the increases in obtainable resolution.
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Affiliation(s)
- Thomas Schlichthaerle
- Faculty of Physics and Center for Nanoscience, LMU Munich, Geschwister-Scholl-Platz 1, 80539, Munich, Germany.,Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Mahipal Ganji
- Faculty of Physics and Center for Nanoscience, LMU Munich, Geschwister-Scholl-Platz 1, 80539, Munich, Germany.,Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Alexander Auer
- Faculty of Physics and Center for Nanoscience, LMU Munich, Geschwister-Scholl-Platz 1, 80539, Munich, Germany.,Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Orsolya Kimbu Wade
- Faculty of Physics and Center for Nanoscience, LMU Munich, Geschwister-Scholl-Platz 1, 80539, Munich, Germany.,Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Ralf Jungmann
- Faculty of Physics and Center for Nanoscience, LMU Munich, Geschwister-Scholl-Platz 1, 80539, Munich, Germany.,Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
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13
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Abstract
The objective in routine analyses is generally to determine a small number of analytes. With samples containing ∼103 or more components there will be insufficient peak capacity to resolve analytes from nonanalytes. This issue was addressed herein through a new type of separation mechanism in which small groups of targeted analytes are bound with high affinity to a soluble analyte-sequestering transport phase (ASTP) composed of a ∼25 nm Stokes radius hydrophilic polymer core (HPC). When introduced into a 30 nm pore diameter size-exclusion chromatography (SEC) column, ASTP/analyte complexes elute within minutes, together, unretained, and relatively pure in the first chromatographic peak. Nonanalytes, in contrast, enter pore matrices of the packing material, are retarded in elution velocity, and are eluted later, separated from analytes. Fabrication of ASTPs was achieved by covalently coupling an antibody or some other affinity selector to a high molecular weight HPC. Beyond sequestering analytes, the function of ASTPs is to act as a molecular weight shifting agent, conveying an effective molecular weight to analytes that is much larger than that of nonanalytes and causing them to elute in the SEC void volume. This mode of separation is referred to as mobile affinity sorbent chromatography (MASC). Subsequent to their purification, ASTP/analyte complexes were detected by fluorescence spectrometry.
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Affiliation(s)
- ZhiYu Li
- Novilytic, Kurz Purdue Technology Center (KPTC), 1281 Win Hentschel Boulevard, West Lafayette, Indiana 47906, United States
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14
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Jia L, Minamihata K, Ichinose H, Tsumoto K, Kamiya N. Polymeric SpyCatcher Scaffold Enables Bioconjugation in a Ratio-Controllable Manner. Biotechnol J 2017; 12. [DOI: 10.1002/biot.201700195] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 09/16/2017] [Indexed: 01/05/2023]
Affiliation(s)
- Lili Jia
- Department of Applied Chemistry; Graduate School of Engineering; Kyushu University; 744 Motooka Fukuoka 819-0395 Japan
| | - Kosuke Minamihata
- Department of Applied Chemistry; Graduate School of Engineering; Kyushu University; 744 Motooka Fukuoka 819-0395 Japan
| | - Hirofumi Ichinose
- Faculty of Agriculture; Kyushu University; Hakozaki 6-10-1 Higashi-ku Fukuoka 812-8581 Japan
| | - Kouhei Tsumoto
- Department of Chemistry and Biotechnology; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Noriho Kamiya
- Department of Applied Chemistry; Graduate School of Engineering; Kyushu University; 744 Motooka Fukuoka 819-0395 Japan
- Division of Biotechnology; Center for Future Chemistry; Kyushu University; Fukuoka 819-0388 Japan
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15
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Affiliation(s)
- Nika Kruljec
- Faculty
of Pharmacy, University of Ljubljana, Aškerčeva 7, SI-1000 Ljubljana, Slovenia
| | - Tomaž Bratkovič
- Faculty
of Pharmacy, University of Ljubljana, Aškerčeva 7, SI-1000 Ljubljana, Slovenia
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16
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Oriented conjugation of antibodies against the epithelial cell adhesion molecule on fluorescently doped silica nanoparticles for flow-cytometric determination and in vivo imaging of EpCAM, a biomarker for colorectal cancer. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2211-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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17
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Frenzel D, Willbold D. Kinetic titration series with biolayer interferometry. PLoS One 2014; 9:e106882. [PMID: 25229647 PMCID: PMC4167697 DOI: 10.1371/journal.pone.0106882] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2014] [Accepted: 08/03/2014] [Indexed: 11/18/2022] Open
Abstract
Biolayer interferometry is a method to analyze protein interactions in real-time. In this study, we illustrate the usefulness to quantitatively analyze high affinity protein ligand interactions employing a kinetic titration series for characterizing the interactions between two pairs of interaction patterns, in particular immunoglobulin G and protein G B1 as well as scFv IC16 and amyloid beta (1-42). Kinetic titration series are commonly used in surface plasmon resonance and involve sequential injections of analyte over a desired concentration range on a single ligand coated sensor chip without waiting for complete dissociation between the injections. We show that applying this method to biolayer interferometry is straightforward and i) circumvents problems in data evaluation caused by unavoidable sensor differences, ii) saves resources and iii) increases throughput if screening a multitude of different analyte/ligand combinations.
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Affiliation(s)
- Daniel Frenzel
- Forschungszentrum Jülich, ICS-6 Structural Biochemistry, Jülich, Germany
| | - Dieter Willbold
- Forschungszentrum Jülich, ICS-6 Structural Biochemistry, Jülich, Germany
- Heinrich-Heine-Universität Düsseldorf, Institut für Physikalische Biologie, Düsseldorf, Germany
- * E-mail:
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