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Hagawa H, Imai K, Gao Z, Taniguchi M, Shimizu K, Honda H. Selective concentration of antimicrobial peptides to heat-treated porous silica gel using adsorption/desorption. J Biosci Bioeng 2021; 133:161-167. [PMID: 34848124 DOI: 10.1016/j.jbiosc.2021.11.002] [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: 09/15/2021] [Revised: 10/19/2021] [Accepted: 11/05/2021] [Indexed: 11/16/2022]
Abstract
Heat-treated porous silica gel (HT silica gel) previously developed by our group has selectively adsorbed cationic peptides at a pH of 7. Therefore, we focused on the use of antimicrobial peptides (AMPs) as bioactive peptides (BPs). First, 32 AMPs and 32 randomly designed peptides were generated using Fmoc solid synthesis, and their adsorption ratio to HT-silica gel was investigated. Thirty two AMPs showed a relatively higher adsorption ratio of 58.8% compared to that of randomly designed peptides, which was 35.3%. Desorption conditions were investigated using Amyl-1-18 antimicrobial peptides. Next, pepsin hydrolysate from rice endosperm protein (REP) powder was prepared by ourselves. The REP hydrolysate containing dry matter (7.5 mg) was applied to the adsorption/desorption (AD) procedure using HT silica gel to obtain 1.6 mg of AD hydrolysate. When the two hydrolysates were subjected to mass spectrometry, 305 concentrated peptides were obtained. In total, 26 peptides with high content and high enrichment ratios were listed and synthesized. When the antimicrobial activity of these 26 peptides was evaluated using Cutibacterium acnes, five peptides consisting of 12-27 amino acids were identified as novel AMPs. Two of these peptides, which were derived from rice glutelin, showed antimicrobial activity against all four microbes, including Porphyromonas gingivalis, Escherichia coli, and Streptococcus mutans. In the present study, we showed that AMPs could be easily enriched from protein hydrolysate using HT silica gel. The adsorption/desorption procedure using HT silica gel was confirmed to be a useful tool for convenient BP separation.
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Affiliation(s)
- Hitomi Hagawa
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Kento Imai
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Ziwei Gao
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Masayuki Taniguchi
- Department of Liberal Studies, Niigata Seiryo University Junior College, 1-5939 Suido-cho, Chuo-ku, Niigata 951-8121, Japan
| | - Kazunori Shimizu
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Hiroyuki Honda
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
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2
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Ito M, Shimizu K, Honda H. Bile acid micelle disruption activity of short-chain peptides from tryptic hydrolyzate of edible proteins. J Biosci Bioeng 2020; 130:514-519. [DOI: 10.1016/j.jbiosc.2020.07.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/06/2020] [Accepted: 07/09/2020] [Indexed: 02/04/2023]
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3
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Kozaki I, Shimizu K, Honda H. Disulfide linked hetero dimeric peptide arrays for screening functional peptides inside cells. J Biosci Bioeng 2020; 129:613-618. [DOI: 10.1016/j.jbiosc.2019.11.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/14/2019] [Accepted: 11/25/2019] [Indexed: 01/06/2023]
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4
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Ito M, Shimizu K, Honda H. Searching for high-binding peptides to bile acid for inhibition of intestinal cholesterol absorption using principal component analysis. J Biosci Bioeng 2019; 127:366-371. [DOI: 10.1016/j.jbiosc.2018.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 07/23/2018] [Accepted: 08/13/2018] [Indexed: 01/17/2023]
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5
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Kozaki I, Shimizu K, Honda H. Effective modification of cell death-inducing intracellular peptides by means of a photo-cleavable peptide array-based screening system. J Biosci Bioeng 2017; 124:209-214. [DOI: 10.1016/j.jbiosc.2017.03.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 03/22/2017] [Indexed: 10/19/2022]
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6
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Kume A, Okochi M, Shimizu K, Yoshida Y, Honda H. Development of a tactical screening method to investigate the characteristics of functional peptides. BIOTECHNOL BIOPROC E 2016. [DOI: 10.1007/s12257-015-0523-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Effects of the properties of short peptides conjugated with cell-penetrating peptides on their internalization into cells. Sci Rep 2015; 5:12884. [PMID: 26256261 PMCID: PMC4530456 DOI: 10.1038/srep12884] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 07/13/2015] [Indexed: 12/14/2022] Open
Abstract
Peptides, especially intracellular functional peptides that can play a particular role inside a cell, have attracted attention as promising materials to control cell fate. However, hydrophilic materials like peptides are difficult for cells to internalize. Therefore, the screening and design of intracellular functional peptides are more difficult than that of extracellular ones. An effective high-throughput screening system for intracellular functional peptides has not been reported. Here, we demonstrate a novel peptide array system for screening intracellular functional peptides, in which both cell-penetrating peptide (CPP) domain and photo-cleavable linkers are used. By using this screening system, we determined how the cellular uptake properties of CPP-conjugated peptides varied depending on the properties of the conjugated peptides. We found that the internalization ability of CPP-conjugated peptides varied greatly depending on the property of the conjugated peptides, and anionic peptides drastically decreased the uptake ability. We summarized our data in a scatter diagram that plots hydrophobicity versus isoelectric point (pI) of conjugated peptides. These results define a peptide library suitable for screening of intracellular functional peptides. Thus, our system, including the diagram, is a promising tool for searching biological active molecules such as peptide-based drugs.
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Okochi M, Kuboyama M, Tanaka M, Honda H. Design of a dual-function peptide probe as a binder of angiotensin II and an inducer of silver nanoparticle aggregation for use in label-free colorimetric assays. Talanta 2015; 142:235-9. [PMID: 26003717 DOI: 10.1016/j.talanta.2015.04.054] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 04/17/2015] [Indexed: 01/21/2023]
Abstract
Label-free colorimetric assays using metallic nanoparticles have received much recent attention, for their application in simple and sensitive methods for detection of biomolecules. Short peptide probes that can bind to analyte biomolecules are attractive ligands in molecular nanotechnology; however, identification of biological recognition motifs is usually based on trial-and-error experiments. Herein, a peptide probe was screened for colorimetric detection of angiotensin II (Ang II) using a mechanism for non-crosslinking aggregation of silver nanoparticles (AgNPs). The dual-function peptides, which bind to the analyte and induce AgNP aggregation, were identified using a two-step strategy: (1) screening of an Ang II-binding peptide from an Ang II receptor sequence library, using SPOT technology, which enable peptides synthesis on cellulose membranes via an Fmoc method and (2) selection of peptide probes that effectively induce aggregation of AgNPs using a photolinker modified peptide array. Using the identified peptide probe, KGKNKRRR, aggregation of AgNPs was detected by observation of a pink color in the absence of Ang II, whereas AgNPs remained dispersed in the presence of Ang II (yellow). The color changes were not observed in the presence of other hormone molecules. Ang II could be detected within 15 min, with a detection limit of 10 µM, by measuring the ratio of absorbance at 400 nm and 568 nm; the signal could also be observed with the naked eye. These data suggest that the peptide identified here could be used as a probe for simple and rapid colorimetric detection of Ang II. This strategy for the identification of functional peptides shows promise for the development of colorimetric detection of various diagnostically important biomolecules.
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Affiliation(s)
- Mina Okochi
- Department of Biotechnology, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan; Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-S1-24, O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
| | - Masashi Kuboyama
- Department of Biotechnology, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Masayoshi Tanaka
- Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-S1-24, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hiroyuki Honda
- Department of Biotechnology, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Screening of an α-Amylase Inhibitor Peptide by Photolinker–Peptide Array. Biosci Biotechnol Biochem 2014; 76:819-24. [DOI: 10.1271/bbb.110963] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Screening of peptide ligands that bind to the Fc region of IgG using peptide array and its application to affinity purification of antibody. Biochem Eng J 2013. [DOI: 10.1016/j.bej.2013.06.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Asai Y, Sugita T, Kato R, Okochi M, Nakagawa K, Honda H. Enhancement of the Activity of a Lactobacilli-Aggregating Peptide by Freezing Treatment. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2012. [DOI: 10.1252/jcej.12we086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuji Asai
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Tomoya Sugita
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Ryuji Kato
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Mina Okochi
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Kyuya Nakagawa
- Department of Mechanical and System Engineering, University of Hyogo
| | - Hiroyuki Honda
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
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Katayama M, Sugita T, Kato R, Okochi M, Matsushima M, Kawabe T, Takase T, Yoshida Y, Kawase M, Honda H. Screening of IgG-Fc Binding Peptides from Milk Protein Using Slide Glass Type-Exclusive Peptide Array. KAGAKU KOGAKU RONBUN 2011. [DOI: 10.1252/kakoronbunshu.37.546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Makoto Katayama
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Tomoya Sugita
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Ryuji Kato
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | - Mina Okochi
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
| | | | | | | | | | | | - Hiroyuki Honda
- Department of Biotechnology, Graduate School of Engineering, Nagoya University
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14
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Directed evolution of angiotensin II-inhibiting peptides using a microbead display. J Biosci Bioeng 2009; 109:411-7. [PMID: 20226387 DOI: 10.1016/j.jbiosc.2009.10.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 10/10/2009] [Accepted: 10/13/2009] [Indexed: 11/22/2022]
Abstract
Angiotensin II (ang II), an octapeptide (DRVYVHPF), can regulate blood pressure by binding specifically to its receptor, AT1. A peptide (VVIVIY) in the first transmembrane of AT1 has been found, via peptide array technology, to have an affinity for ang II. In this study, the peptide P2, which contained the VVIVIY sequence, was mutated and screened using microbead display technology that utilized emulsion PCR and cell-free protein synthesis. After one round of screening, the binding activities of collected mutants were estimated using flow cytometry and a peptide array. Two of these exhibited improved association rate constants to ang II, compared to the P2 peptide.
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15
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Ochi Y, Hamazu M, Kajita Y, Hachiya T, Kunimatsu M, Sato T, Nagata A. Increased receptor binding by bovine (b) TSH bound to monoclonal antibody to bTSHbeta-subunit. Endocr J 2008; 55:105-11. [PMID: 18202525 DOI: 10.1507/endocrj.k07e-015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
TSH receptor (R) binding and cAMP production by bovine (b) TSH-bound to a monoclonal antibody (MoAb) or polyclonal antibody (Ab) to bTSH were examined, using TSH receptor (R) coating tube and porcine thyroid cells. (125) I-bTSH bound-to MoAbs to bTSH(alpha) or discontinuous type MoAb showed TSHR binding (10%) similar to intact (125) I-bTSH. TSHR binding was completely decreased (<2%) when (125) I-bTSH was bound by polyclonal Abs to bTSH(alpha) in Graves' patient or rabbit polyclonal Abs to bTSH. When either of the two MoAb (No. 1 and 2) to bTSH(beta) was bound to (125) I-bTSH, TSHR binding was 4 times higher (40%) compared to intact (125) I-bTSH. Binding of another MoAb (No. 3) caused no increased binding. TSHR binding of intact (125) I-bTSH was decreased from 10% to 2% by excess amounts of bTSH. Binding of (125) I-bTSH bound to MoAb to bTSH(beta) (No. 1 and 2) decreased from 40% to 30% by excess amounts of bTSH. When (125) I-bTSH bound-Fab of MoAb was used, the binding was reduced from 30 to 10% (No. 1) and from 25 to 6% (No. 2), respectively. In contrast, cAMP production by bTSH was decreased by pre-binding of all MoAbs and polyclonal Abs. Binding of (125) I-MoAb to bTSH (beta) to a synthetic peptide array of bTSH (beta) sequence was examined by the radioautography. The epitope of MoAb to bTSH(beta) was suggested to be LPK (beta 42-44) for No. 1, KLF (beta 39-41) for No. 2 and PKYA (beta 43-46) for No. 3, respectively, although the existence of discontinuous epitope could not be ruled out. The increased TSHR binding and the decreased cAMP production by bTSH bound to MoAbs may be due to the conformational change of TSH molecule or TSHR by binding of both bTSH and MoAb.
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Affiliation(s)
- Yukio Ochi
- Research Institute for Production Development, Shimogamo, Kyoto, Japan
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Kaga C, Okochi M, Nakanishi M, Hayashi H, Kato R, Honda H. Screening of a novel octamer peptide, CNSCWSKD, that induces caspase-dependent cell death. Biochem Biophys Res Commun 2007; 362:1063-8. [PMID: 17822671 DOI: 10.1016/j.bbrc.2007.08.110] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2007] [Accepted: 08/20/2007] [Indexed: 11/28/2022]
Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is known to induce apoptosis to various tumor cells but not in normal cells. We have screened cell death-inducing peptides from the extracellular domain sequence of TRAIL, using a peptide array. Peptides of higher activity were found through amino acid substitution, and the CNSCWSKD peptide induced >90% cell death in treated Jurkat cells. Features of apoptosis, such as DNA fragmentation, activation of caspase, phosphatidylserine externalization, chromatin condensation, and competition with TRAIL for binding to the death receptor (DR) 4 or DR5 were observed, suggesting that this peptide is a TRAIL mimic. Caspase-3 activation was observed in various tumor cells treated with this peptide as well as with TRAIL, while no activation was observed in human normal fibroblasts. The CNSCWSKD peptide is a potential candidate for use in cancer therapy.
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Affiliation(s)
- Chiaki Kaga
- Department of Biotechnology, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Abstract
In the continuous drive to increase screening throughput and reduce sample requirement, microarray-based
technologies have risen to the occasion. In the past 7 years, a number of new methodologies have
been developed for preparing small molecule microarrays from combinatorial and natural product libraries
with the goal of identifying new interactions or enzymatic activities. Recent advances and applications
of small molecule microarrays are reviewed.
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Kato R, Kaga C, Kunimatsu M, Kobayashi T, Honda H. Peptide array-based interaction assay of solid-bound peptides and anchorage-dependant cells and its effectiveness in cell-adhesive peptide design. J Biosci Bioeng 2006; 101:485-95. [PMID: 16935250 DOI: 10.1263/jbb.101.485] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2006] [Accepted: 03/22/2006] [Indexed: 11/17/2022]
Abstract
Peptide array, the designable peptide library covalently synthesized on cellulose support, was applied to assay peptide-cell interaction, between solid-bound peptides and anchorage-dependant cells, to study objective peptide design. As a model case, cell-adhesive peptides that could enhance cell growth as tissue engineering scaffold material, was studied. On the peptide array, the relative cell-adhesion ratio of NIH/3T3 cells was 2.5-fold higher on the RGDS (Arg-Gly-Asp-Ser) peptide spot as compared to the spot with no peptide, thus indicating integrin-mediated peptide-cell interaction. Such strong cell adhesion mediated by the RGDS peptide was easily disrupted by single residue substitution on the peptide array, thus indicating that the sequence recognition accuracy of cells was strictly conserved in our optimized scheme. The observed cellular morphological extension with active actin stress-fiber on the RGD motif-containing peptide supported our strategy that peptide array-based interaction assay of solid-bound peptide and anchorage-dependant cells (PIASPAC) could provide quantitative data on biological peptide-cell interaction. The analysis of 180 peptides obtained from fibronectin type III domain (no. 1447-1629) yielded 18 novel cell-adhesive peptides without the RGD motif. Taken together with the novel candidates, representative rules of ineffective amino acid usage were obtained from non-effective candidate sequences for the effective designing of cell-adhesive peptides. On comparing the amino acid usage of the top 20 and last 20 peptides from the 180 peptides, the following four brief design rules were indicated: (i) Arg or Lys of positively charged amino acids (except His) could enhance cell adhesion, (ii) small hydrophilic amino acids are favored in cell-adhesion peptides, (iii) negatively charged amino acids and small amino acids (except Gly) could reduce cell adhesion, and (iv) Cys and Met could be excluded from the sequence combination since they have less influence on the peptide design. Such rules that are indicative of the nature of the functional peptide sequence can be obtained only by the mass comparison analysis of PIASPAC using peptide array. By following such indicative rules, numerous amino acid combinations can be effectively screened for further examination of novel peptide design.
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Affiliation(s)
- Ryuji Kato
- Department of Biotechnology, School of Engineering, Nagoya University, Nagoya 464-8603, Japan
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Wegner GJ, Wark AW, Lee HJ, Codner E, Saeki T, Fang S, Corn RM. Real-time surface plasmon resonance imaging measurements for the multiplexed determination of protein adsorption/desorption kinetics and surface enzymatic reactions on peptide microarrays. Anal Chem 2006; 76:5677-84. [PMID: 15456285 DOI: 10.1021/ac0494275] [Citation(s) in RCA: 156] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The kinetics of protein adsorption/desorption onto peptide microarrays was studied using real-time surface plasmon resonance (SPR) imaging. S protein binding interactions were examined using an array composed of five different peptides: N terminal and C terminal immobilized wild-type S peptide (S1 and S2), an alternate binding sequence derived by phage display (LB2), an NVOC-protected S peptide, and a FLAG peptide control sequence (F). Kinetic measurements of the S protein-S1 peptide interaction were analyzed to determine a desorption rate constant (k(d)) of 1.1 (+/-0.08) x 10(-2) s(-1), an adsorption rate constant (k(a)) of 1.9 (+/-0.05) x 10(5) M(-1) s(-1), and an equilibrium adsorption constant (K(Ads)) of 1.7 (+/-0.08) x 10(7) M(-1). SPR imaging equilibrium measurements of S protein to S1 peptide were performed to independently confirm the kinetically determined value of K(Ads). Rate constants for the S2 and LB2 peptides on the array were measured as follows: 1.6 (+/-0.04) x 10(5) M(-1) s(-1) (k(a)) and 1.1 (+/-0.07) x 10(-2) s(-1) (k(d)) for S2, 1.2 (+/-0.05) x 10(5) M(-1) s(-1) (k(a)) and 1.1 (+/-0.03) x 10(-2) s(-1) (k(d)) for LB2. In addition to S protein adsorption/desorption, real-time SPR imaging of peptide arrays was applied to study the surface enzymatic activities of the protease factor Xa. Enzymatic cleavage of the substrate peptide (P1) was shown to follow first-order kinetics and proceed at a rate 10 times faster than that of the mutant peptide (P2), with cleavage velocities of 5.6 (+/-0.3) x 10(-4) s(-1) for P1 and 5.7 (+/-0.3) x 10(-5) s(-1) for P2.
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Affiliation(s)
- Greta J Wegner
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, WI 53706, USA
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Cherif B, Roget A, Villiers CL, Calemczuk R, Leroy V, Marche PN, Livache T, Villiers MB. Clinically Related Protein–Peptide Interactions Monitored in Real Time on Novel Peptide Chips by Surface Plasmon Resonance Imaging. Clin Chem 2006; 52:255-62. [PMID: 16339301 DOI: 10.1373/clinchem.2005.058727] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Background: Developing rapid, high-throughput assays for detecting and characterizing protein–protein interactions is a great challenge in the postgenomic era. We have developed a new method that allows parallel analysis of multiple analytes in biological fluids and is suitable for biological and medical studies.
Methods: This technology for studying peptide–antibody interactions is based on polypyrrole-peptide chips and surface plasmon resonance imaging (SPRi). We generated a chip bearing a large panel of peptide probes by successive electro-directed copolymerizations of pyrrole–peptide conjugates on a gold surface.
Results: We provide evidence that (a) the signal produced by antibody binding is highly specific; (b) the detected signal specifically reflects the antibody concentration of the tested solution in a dose-dependent manner; (c) this technique is appropriate for analyzing complex media such as undiluted sera, a novelty with respect to previous techniques; and (d) correlation between classic ELISA results and the SPRi signal is good (P = 0.008). We also validated this system in a medical model by detecting anti-hepatitis C antibodies in patient-derived sera.
Conclusion: Because of its characteristics (easy preparation of the peptide chip; high-throughput, label-free, real-time detection; high specificity; and low background), this technology is suitable for screening biological samples and for large-scale studies.
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Affiliation(s)
- Boutheina Cherif
- Laboratoire d'Immunochimie, Commissariat à L'Energie Atomique-Grenoble/Départment Réponse et Dynamique Cellulaire, Institut National de la Santé et de la Recherche Médicale U548, Université J. Fourier, Grenoble, France
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Kumaresan PR, Lam KS. Screening chemical microarrays: methods and applications. MOLECULAR BIOSYSTEMS 2006; 2:259-70. [PMID: 16880944 DOI: 10.1039/b602004f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Pappanaicken R Kumaresan
- Division of Hematology & Oncology, Department of Internal Medicine, UC Davis Cancer Center, University of California Davis, 4501 X Street, Sacramento, CA 95817, USA
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