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Li J, Zhu M, Wang M, Qi W, Su R, He Z. Molecularly imprinted peptide-based enzyme mimics with enhanced activity and specificity. SOFT MATTER 2020; 16:7033-7039. [PMID: 32667008 DOI: 10.1039/d0sm00635a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We herein report the construction of peroxidase (POD)-mimicking catalysts based on the strategy of peptide assembly and molecular imprinting. Upon co-assembly of Fmoc-FFH and Hemin, we firstly fabricated CA-H/Hemin which displayed POD-like catalytic activity and showed a 21-fold rate acceleration in the oxidation of 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulphonate) (ABTS) compared to the uncatalyzed reaction. Then, upon combining CA-H/Hemin with the ABTS-imprinted polymer, the obtained imprinted catalyst (MIP-H/Hemin) showed 52-fold acceleration due to the enhanced re-binding toward ABTS. Moreover, by introducing cationic monomers, a 137-fold rate enhancement was further achieved for the positively charged imprinted catalyst (MIP+-H/Hemin), from the synergistic effect of molecular imprinting and electrostatic attraction. Remarkably, by comparing the catalytic activity of these POD mimics towards ABTS and 3,3',5,5'-tetramethylbenzidine (TMB), we also highlighted the substrate specificity of MIP-H/Hemin and MIP+-H/Hemin toward ABTS. This study provides a promising approach to improve the catalytic activity and specificity of peptide-based enzyme mimics.
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Affiliation(s)
- Jingyi Li
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China.
| | - Mingjie Zhu
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China.
| | - Mengfan Wang
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China. and Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, P. R. China
| | - Wei Qi
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China. and Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, P. R. China and The Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin, Tianjin, 300350, P. R. China
| | - Rongxin Su
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China. and Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300350, P. R. China and The Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin, Tianjin, 300350, P. R. China
| | - Zhimin He
- School of Chemical Engineering and Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, P. R. China.
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Xie Y, Xu M, Wang L, Liang H, Wang L, Song Y. Iron-porphyrin-based covalent-organic frameworks for electrochemical sensing H 2O 2 and pH. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 112:110864. [PMID: 32409033 DOI: 10.1016/j.msec.2020.110864] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/12/2020] [Accepted: 03/18/2020] [Indexed: 10/24/2022]
Abstract
Here, a novel iron-porphyrin-based covalent organic framework (COFp-Fepor NH2-BTA) was synthesized and applied for electrochemical sensing H2O2 and pH which involved in many biological processes. The COFp-Fepor NH2-BTA was obtained by post-modification of porphyrin-based COF (COFp-por NH2-BTA) which was firstly synthesized by aldehyde-ammonia condensation reaction between 1,3,5-benzenetricarboxaldehyde and 5,10,15,20-tetrakis(4-aminophenyl)-21H,23H- porphine. The COFp-por NH2-BTA was proved to be regular and uniform spherical particles with diameter about 1 μm, as well as possessed good crystalline structure and abundant micropores of about 1.4 nm. The resulted COFp-Fepor NH2-BTA after post-modification with Fe2+ maintained the original shape and crystalline structure of COFp-por NH2-BTA, while the micropores decreased to be about 0.89 nm. Electrochemical results indicated that the synthesized COFp-Fepor NH2-BTA had good electrochemical redox and proton activity owing to iron-porphyrin, enabling to simultaneously be used as mimic peroxidase to catalyze the reduction of hydrogen peroxide (H2O2) and evaluate pH using current and potential as signal, respectively. The prepared sensor showed good performance for H2O2 detection from 6.85 nM to 7 μM with the detection limit of 2.06 nM (S/N = 3), and pH test from 3.0 to 9.0. This work demonstrated that the iron-porphyrin-based COF could be used as a mimic peroxidase to apply in biological fields.
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Affiliation(s)
- Yi Xie
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Mengli Xu
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Li Wang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Huihui Liang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Linyu Wang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yonghai Song
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Key Laboratory of Chemical Biology, Jiangxi Province, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.
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Calcium and phosphorylation double-regulating caltractin initiating target protein XPC function. Int J Biol Macromol 2019; 136:503-511. [DOI: 10.1016/j.ijbiomac.2019.06.095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 06/12/2019] [Accepted: 06/13/2019] [Indexed: 01/22/2023]
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