1
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Huang X, Gao T, Chen X, Cai X, Huang J, Wang S. Taste characteristics of salty peptides from Porphyra haitanensis and the synergistic saltiness enhancement with CaCl 2. Food Chem 2024; 461:140901. [PMID: 39178541 DOI: 10.1016/j.foodchem.2024.140901] [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: 04/20/2024] [Revised: 08/05/2024] [Accepted: 08/15/2024] [Indexed: 08/26/2024]
Abstract
The excessive consumption of sodium-containing seasonings has led to an increased burden on individuals' cardiovascular system and adversely affected their health. Recently, an innovative salt-reducing strategy utilizing salty peptides has emerged with promising prospects. In this study, Porphyra haitanensis salty peptides (PHSPs) was obtained through hydrolysis and ultrafiltration. The salty taste of 30 mg/mL PHSPs was comparable to that of about 40 mM NaCl. The higher proportion of umami and sweet amino acids in PHSPs was found, which contributed to the salty and umami taste. Factors affecting the flavor of PHSPs were also investigated. CaCl2 exhibited the excellent synergistic enhancement with PHSPs on the salty taste, while the bitter taste of CaCl2 was masked in the presence of PHSPs, which was attributed to the chelation between calcium and peptides. Above all, it is expected that PHSPs can be further developed and support the emerging salt-reducing strategy in food engineering.
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Affiliation(s)
- Xincheng Huang
- College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China
| | - Tingting Gao
- College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China
| | - Xu Chen
- College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China
| | - Xixi Cai
- College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China; Qingyuan Innovation Laboratory, Quanzhou 362801, China; Fuzhou Institute of Oceanography, Fuzhou 350108, China.
| | - Jianlian Huang
- Fujian Provincial Key Laboratory of Frozen Processed Aquatic Products, Xiamen 361022, China; Anjoy Food Group Co. Ltd., Xiamen 361022, China
| | - Shaoyun Wang
- College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China; Qingyuan Innovation Laboratory, Quanzhou 362801, China; Fuzhou Institute of Oceanography, Fuzhou 350108, China.
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2
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Sha X, Zhu L, Wu H, Li Y, Wu J, Zhang H, Zhang Y, Yang R. Casein phosphopeptide interferes the interactions between ferritin and ion irons. Food Chem 2024; 454:139752. [PMID: 38815330 DOI: 10.1016/j.foodchem.2024.139752] [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: 12/05/2023] [Revised: 04/19/2024] [Accepted: 05/18/2024] [Indexed: 06/01/2024]
Abstract
Ferritin, a vital protein required to store iron in a cage-like structure, is critical for maintaining iron balance. Ferritin can be attacked by free radicals during iron reduction and release, thereby leading to oxidative damage. Whether other biomacromolecules such as casein phosphopeptides (CPP) could influence the ferritin's function in iron oxidation and release and affect the ferritin stability remains unclear. This study aims to investigate the effect of CPP on the ferritin‑iron ion interaction, thereby focusing on role of CPP on ferritin stability. Results showed that CPP weakened the iron oxidation activity of ferritin but promoted iron release. Moreover, CPP could effectively chelate iron, capture hydroxyl radicals, and reduce the degradation of ferritin. This study highlights the role of CPP in the ferritin‑iron relationship, and lays a foundation for understanding the interaction between ferritin, peptides, and metal ions.
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Affiliation(s)
- Xinmei Sha
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Lei Zhu
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Huimin Wu
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yue Li
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Jincan Wu
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Haotong Zhang
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yuyu Zhang
- Key Laboratory of Geriatric Nutrition and Health (Beijing Technology and Business University), Ministry of Education, Beijing 100048, China
| | - Rui Yang
- State Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin 300457, China.
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3
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Jiang B, Yue H, Fu X, Wang J, Feng Y, Li D, Liu C, Feng Z. One-step high efficiency separation of prolyl endopeptidase from Aspergillus niger and its application. Int J Biol Macromol 2024; 271:132582. [PMID: 38801849 DOI: 10.1016/j.ijbiomac.2024.132582] [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: 12/20/2023] [Revised: 04/25/2024] [Accepted: 05/20/2024] [Indexed: 05/29/2024]
Abstract
Prolyl endopeptidase from Aspergillus niger (An-PEP) is an enzyme that recognizes C-terminal peptide bonds of amino acid chains and cleaves them by hydrolysis. An aqueous two-phase system (ATPS) was used to separate An-PEP from fermentation broth. Through single factor experiments, the ATPS containing 16 % (w/w) PEG2000 and 15 % (w/w) (NH4)2SO4 at pH 6.0 obtained the recovery of 79.74 ± 0.16 % and the purification coefficient of 7.64 ± 0.08. It was then used to produce soy protein isolate peptide (SPIP) by hydrolysis of soy protein isolate (SPI), and SPIP-Ferrous chelate (SPIP-Fe) was prepared with SPIP and Fe2+. The chelation conditions were optimized by RSM, as the chelation time was 30 min, chelation temperature was 25 °C, SPIP mass to VC mass was two to one and pH was 6.0. The obtained chelation rate was 82.56 ± 2.30 %. The change in the structures and functional features of SPIP before and after chelation were investigated. The FTIR and UV-Vis results indicated that the chelation of Fe2+ and SPIP depended mainly on the formation of amide bonds. The fluorescence, SEM and amino acid composition analysis results indicated that Fe2+ could induce and stabilize the surface conformation and change the amino acid distribution on the surfaces of SPIP. The chelation of SPIP and Fe2+ resulted in the enhancement of radical scavenging activities and ACE inhibitory activities. This work provided a new perspective for the further development of peptide-Fe chelates for iron supplement.
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Affiliation(s)
- Bin Jiang
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Hongshen Yue
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Xinhao Fu
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Jiaming Wang
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Yu Feng
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Dongmei Li
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Chunhong Liu
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China
| | - Zhibiao Feng
- Department of Chemistry, Northeast Agricultural University, Harbin 150030, China.
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4
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Hu G, Wang D, Sun L, Su R, Corazzin M, Sun X, Dou L, Zhang M, Zhao L, Su L, Jin Y. Isolation, Purification and Structure Identification of a Calcium-Binding Peptide from Sheep Bone Protein Hydrolysate. Foods 2022; 11:foods11172655. [PMID: 36076840 PMCID: PMC9455869 DOI: 10.3390/foods11172655] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/21/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022] Open
Abstract
To isolate a novel peptide with calcium-binding capacity, sheep bone protein was hydrolyzed sequentially using a dual-enzyme system (alcalase treatment following neutrase treatment) and investigated for its characteristics, separation, purification, and structure. The sheep bone protein hydrolysate (SBPH) was enriched in key amino acids such as Gly, Arg, Pro, Leu, Lys, Glu, Val, and Asp. The fluorescence spectra, circular dichroism spectra, and Fourier-transform infrared spectroscopy results showed that adding calcium ions decreased the α-helix and β-sheet content but significantly increased the random and β-turn content (p < 0.05). Carboxyl oxygen and amino nitrogen atoms of SBPH may participate in peptide−calcium binding. Scanning electron microscopy and energy dispersive spectrometry results showed that SBPH had strong calcium-chelating ability and that the peptide−calcium complex (SBPH−Ca) combined with calcium to form a spherical cluster structure. SBPH was separated and purified gradually by ultrafiltration, gel filtration chromatography, and reversed-phase high-performance liquid chromatography. Liquid chromatography-electrospray ionization/mass spectrometry identified the amino acid sequences as GPSGLPGERG (925.46 Da) and GAPGKDGVRG (912.48 Da), with calcium-binding capacities of 89.76 ± 0.19% and 88.26 ± 0.25%, respectively. The results of this study provide a scientific basis for the preparation of a new type of calcium supplement and high-value utilization of sheep bone.
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Affiliation(s)
- Guanhua Hu
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Debao Wang
- Agricultural and Animal Products Processing Research Institute, Inner Mongolia Academy of Agriculture and Animal Husbandry Academy, Hohhot 010018, China
| | - Lina Sun
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Rina Su
- Inner Mongolia Vocational College of Chemical Engineering, Hohhot 010010, China
| | - Mirco Corazzin
- Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, 33100 Udine, Italy
| | - Xueying Sun
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Lu Dou
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Min Zhang
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Lihua Zhao
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Lin Su
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Ye Jin
- College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
- Correspondence:
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5
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de Araujo AD, Lim J, Wu KC, Hoang HN, Nguyen HT, Fairlie DP. Landscaping macrocyclic peptides: stapling hDM2-binding peptides for helicity, protein affinity, proteolytic stability and cell uptake. RSC Chem Biol 2022; 3:895-904. [PMID: 35866171 PMCID: PMC9257625 DOI: 10.1039/d1cb00231g] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 05/19/2022] [Indexed: 12/25/2022] Open
Abstract
Surveying macrocycles for mimicking a helical tumor suppressor protein, resisting breakdown by proteases, and entering cancer cells.
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Affiliation(s)
- Aline D. de Araujo
- Division of Chemistry and Structural Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Junxian Lim
- Division of Chemistry and Structural Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Kai-Chen Wu
- Division of Chemistry and Structural Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Huy N. Hoang
- Division of Chemistry and Structural Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Huy T. Nguyen
- Division of Chemistry and Structural Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - David P. Fairlie
- Division of Chemistry and Structural Biology, ARC Centre of Excellence for Innovations in Peptide and Protein Science, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
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6
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Wang Z, Cheng S, Wu D, Xu Z, Xu S, Chen H, Du M. Hydrophobic peptides from oyster protein hydrolysates show better zinc-chelating ability. FOOD BIOSCI 2021. [DOI: 10.1016/j.fbio.2021.100985] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Zhu S, Zheng Y, He S, Su D, Nag A, Zeng Q, Yuan Y. Novel Zn-Binding Peptide Isolated from Soy Protein Hydrolysates: Purification, Structure, and Digestion. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:483-490. [PMID: 33370528 DOI: 10.1021/acs.jafc.0c05792] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, a novel Zn-binding peptide, Lys-Tyr-Lys-Arg-Gln-Arg-Trp (KYKRQRW), was purified and identified from soy protein isolate hydrolysates (SPIHs). The Zn-binding peptide exhibited improved Zn-binding capacity (83.21 ± 2.65%) than SPIH solutions. CD, NMR, and Fourier transform infrared spectroscopy were used to confirm the complexation between Zn and the peptide. The results showed that the Zn-binding peptide formed a folding structure with part of the β-sheet (29.3-13.4%) turning into random coils (41.7-57.6%) during complexation. It was further proved that the binding sites were located at the oxygen atoms on the carboxyl group of the Trp side chain and nitrogen atoms on the amino group of the Lys side chain. Moreover, the Zn-peptide complex exhibited increased solubility than ZnSO4 during simulated gastrointestinal digestion. This study highlighted that the novel soy peptide possessed a strong zinc chelate rate and had a positive effect on the gastrointestinal stability of Zn which could be utilized as a functional ingredient in future.
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Affiliation(s)
- Suyin Zhu
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
| | - Yingmin Zheng
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
| | - Shan He
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
- Flinders Institute for NanoScale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia
| | - Dongxiao Su
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
| | - Anindya Nag
- School of Engineering, Macquarie University, Sydney 2109, Australia
| | - Qingzhu Zeng
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
| | - Yang Yuan
- School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China
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8
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Lin Y, Cai X, Wu X, Lin S, Wang S. Fabrication of snapper fish scales protein hydrolysate-calcium complex and the promotion in calcium cellular uptake. J Funct Foods 2020. [DOI: 10.1016/j.jff.2019.103717] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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9
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Zhang Z, Zhou F, Liu X, Zhao M. Particulate nanocomposite from oyster ( Crassostrea rivularis ) hydrolysates via zinc chelation improves zinc solubility and peptide activity. Food Chem 2018; 258:269-277. [DOI: 10.1016/j.foodchem.2018.03.030] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 03/03/2018] [Accepted: 03/08/2018] [Indexed: 12/22/2022]
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10
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Sun N, Cui P, Lin S, Yu C, Tang Y, Wei Y, Xiong Y, Wu H. Characterization of sea cucumber (stichopus japonicus) ovum hydrolysates: calcium chelation, solubility and absorption into intestinal epithelial cells. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:4604-4611. [PMID: 28349531 DOI: 10.1002/jsfa.8330] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/21/2017] [Accepted: 03/21/2017] [Indexed: 06/06/2023]
Abstract
BACKGROUND Sea cucumber (Stichopus japonicus) ovum hydrolysates (SCOHs) chelated with calcium were produced to investigate the characteristics of calcium binding and solubility, as well as to study any effects on calcium absorption by human intestinal epithelial cells. RESULTS The results of the present study show that the calcium-binding capacity of SCOHs depended greatly on the type of proteases. The maximum level of Ca binding (0.38 mmol L-1 ) occurred when trypsin was used, with a peptide yield of 85.7%. Investigation of the possible chelating modes between SCOHs and calcium ions indicated that calcium ions bound to SCOHs primarily via interactions with carboxyl oxygen and amino nitrogen atoms of Glu and Asp and also that the phosphoserine residues might be also responsible for SCOH-calcium chelation. Moreover, SCOH-calcium complexes maintained the solubility of calcium under simulated gastrointestinal digestion, regardless of the presence of dietary components such as oxalate. Furthermore, SCOH-Ca led to higher peak intracellular [Ca2+ ]i in both Caco-2 cells (338.3 nmol L-1 versus 269.6 nmol L-1 ) and HT-29 cells (373.9 nmol L-1 versus 271.7 nmol L-1 ) than casein phosphopeptide-Ca. CONCLUSION Carboxyl oxygen and amino nitrogen atoms in the SCOHs could bind calcium ions, forming SCOH-calcium complexes. These complexes improved calcium solubility under simulated gastrointestinal digestion and also promoted calcium absorption in Caco-2 and HT-29 cells. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Na Sun
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
| | - Pengbo Cui
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
| | - Songyi Lin
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
| | - Cuiping Yu
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
| | - Yue Tang
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
| | - Ye Wei
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
| | - Youling Xiong
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KT, USA
| | - Haitao Wu
- School of Food Science and Technology, Dalian Polytechnic University, National Engineering Research Center of Seafood, Dalian, PR China
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11
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Marshall GR, Ballante F. Limiting Assumptions in the Design of Peptidomimetics. Drug Dev Res 2017; 78:245-267. [DOI: 10.1002/ddr.21406] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Garland R. Marshall
- Department of Biochemistry and Molecular Biophysics; Washington University School of Medicine; St. Louis Missouri 63110
| | - Flavio Ballante
- Department of Biochemistry and Molecular Biophysics; Washington University School of Medicine; St. Louis Missouri 63110
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12
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Sun N, Cui P, Li D, Jin Z, Zhang S, Lin S. Formation of crystalline nanoparticles by iron binding to pentapeptide (Asp-His-Thr-Lys-Glu) from egg white hydrolysates. Food Funct 2017; 8:3297-3305. [DOI: 10.1039/c7fo00843k] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel peptide (DHTKE) from egg white hydrolysates could bind iron ions in a 1 : 2 ratioviaits amide and carboxyl groups, forming the DHTKE-iron complex which belongs to crystalline nanoparticles.
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Affiliation(s)
- Na Sun
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Pengbo Cui
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Dongmei Li
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Ziqi Jin
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Shuyu Zhang
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
| | - Songyi Lin
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- P. R. China
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13
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Ekiz MS, Cinar G, Khalily MA, Guler MO. Self-assembled peptide nanostructures for functional materials. NANOTECHNOLOGY 2016; 27:402002. [PMID: 27578525 DOI: 10.1088/0957-4484/27/40/402002] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Nature is an important inspirational source for scientists, and presents complex and elegant examples of adaptive and intelligent systems created by self-assembly. Significant effort has been devoted to understanding these sophisticated systems. The self-assembly process enables us to create supramolecular nanostructures with high order and complexity, and peptide-based self-assembling building blocks can serve as suitable platforms to construct nanostructures showing diverse features and applications. In this review, peptide-based supramolecular assemblies will be discussed in terms of their synthesis, design, characterization and application. Peptide nanostructures are categorized based on their chemical and physical properties and will be examined by rationalizing the influence of peptide design on the resulting morphology and the methods employed to characterize these high order complex systems. Moreover, the application of self-assembled peptide nanomaterials as functional materials in information technologies and environmental sciences will be reviewed by providing examples from recently published high-impact studies.
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Affiliation(s)
- Melis Sardan Ekiz
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara, 06800 Turkey
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14
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Hoang HN, Driver RW, Beyer RL, Hill TA, D. de Araujo A, Plisson F, Harrison RS, Goedecke L, Shepherd NE, Fairlie DP. Helix Nucleation by the Smallest Known α‐Helix in Water. Angew Chem Int Ed Engl 2016; 55:8275-9. [DOI: 10.1002/anie.201602079] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Indexed: 12/31/2022]
Affiliation(s)
- Huy N. Hoang
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Russell W. Driver
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Renée L. Beyer
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Timothy A. Hill
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Aline D. de Araujo
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Fabien Plisson
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Rosemary S. Harrison
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Lena Goedecke
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Nicholas E. Shepherd
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - David P. Fairlie
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
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15
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Hoang HN, Driver RW, Beyer RL, Hill TA, D. de Araujo A, Plisson F, Harrison RS, Goedecke L, Shepherd NE, Fairlie DP. Helix Nucleation by the Smallest Known α‐Helix in Water. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602079] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Huy N. Hoang
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Russell W. Driver
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Renée L. Beyer
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Timothy A. Hill
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Aline D. de Araujo
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Fabien Plisson
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Rosemary S. Harrison
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Lena Goedecke
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - Nicholas E. Shepherd
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
| | - David P. Fairlie
- Division of Chemistry and Structural Biology and ARC Centre of Excellence in Advanced Molecular Imaging Institute for Molecular Bioscience The University of Queensland Brisbane QLD 4072 Australia
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Lin J, Cai X, Tang M, Wang S. Preparation and Evaluation of the Chelating Nanocomposite Fabricated with Marine Algae Schizochytrium sp. Protein Hydrolysate and Calcium. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:9704-14. [PMID: 26499390 DOI: 10.1021/acs.jafc.5b04001] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Marine algae have been becoming a popular research topic because of their biological implication. The algae peptide-based metal-chelating complex was investigated in this study. Schizochytrium sp. protein hydrolysate (SPH) possessing high Ca-binding capacity was prepared through stepwise enzymatic hydrolysis to a degree of hydrolysis of 22.46%. The nanocomposites of SPH chelated with calcium ions were fabricated in aqueous solution at pH 6 and 30 °C for 20 min, with the ratio of SPH to calcium 3:1 (w/w). The size distribution showed that the nanocomposite had compact structure with a radius of 68.16 ± 0.50 nm. SPH was rich in acidic amino acids, accounting for 33.55%, which are liable to bind with calcium ions. The molecular mass distribution demonstrated that the molecular mass of SPH was principally concentrated at 180-2000 Da. UV scanning spectroscopy and Fourier transform infrared spectroscopy suggested that the primary sites of calcium-binding corresponded to the carboxyl groups, carbonyl groups, and amino groups of SPH. The results of fluorescent spectroscopy, size distribution, atomic force microscope, and (1)H nuclear magnetic resonance spectroscopy suggested that calcium ions chelated with SPH would cause intramolecular and intermolecular folding and aggregating. The SPH-calcium chelate exerted remarkable stability and absorbability under either acidic or basic conditions, which was in favor of calcium absorption in the gastrointestinal tracts of humans. The investigation suggests that SPH-calcium chelate has the potential prospect to be utilized as a nutraceutical supplement to improve bone health in the human body.
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Affiliation(s)
- Jiaping Lin
- College of Biological Science and Technology, Fuzhou University , Fuzhou, Fujian 350108, People's Republic of China
| | - Xixi Cai
- College of Biological Science and Technology, Fuzhou University , Fuzhou, Fujian 350108, People's Republic of China
- College of Chemistry, Fuzhou University , Fuzhou, Fujian 350108, People's Republic of China
| | - Mengru Tang
- College of Biological Science and Technology, Fuzhou University , Fuzhou, Fujian 350108, People's Republic of China
| | - Shaoyun Wang
- College of Biological Science and Technology, Fuzhou University , Fuzhou, Fujian 350108, People's Republic of China
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Zhao L, Cai X, Huang S, Wang S, Huang Y, Hong J, Rao P. Isolation and identification of a whey protein-sourced calcium-binding tripeptide Tyr-Asp-Thr. Int Dairy J 2015. [DOI: 10.1016/j.idairyj.2014.08.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Zhao L, Huang Q, Huang S, Lin J, Wang S, Huang Y, Hong J, Rao P. Novel peptide with a specific calcium-binding capacity from whey protein hydrolysate and the possible chelating mode. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:10274-82. [PMID: 25265391 DOI: 10.1021/jf502412f] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A novel peptide with a specific calcium-binding capacity was isolated from whey protein hydrolysates. The isolation procedures included diethylaminoethyl (DEAE) anion-exchange chromatography, Sephadex G-25 gel filtration, and reversed-phase high-performance liquid chromatography (HPLC). A peptide with a molecular mass of 237.99 Da was identified by liquid chromatography-electrospray ionization/mass spectrometry (LC-ESI/MS), and its amino acid sequence was confirmed to be Gly-Tyr. The calcium-binding capacity of Gly-Tyr reached 75.38 μg/mg, increasing by 122% when compared to the hydrolysate complex. The chelating interaction mode between the Gly-Tyr and calcium ion was investigated, indicating that the major binding sites included the oxygen atom of the carbonyl group and nitrogen of the amino or imino group. The folding and structural modification of the peptide arose along with the addition of the calcium ion. The profile of (1)H nuclear magnetic resonance (NMR) spectroscopy demonstrated that the electron cloud density around the hydrogen nucleus in the peptide changed was caused by the calcium ion. The results of ζ potential showed that the Gly-Tyr-Ca chelate was a neutral molecule in which the calcium ion was surrounded by the specific binding sites of the peptide. Moreover, thermogravimetry-differential scanning calorimetry (TG-DSC) and calcium-releasing assay revealed that the Gly-Tyr-Ca chelate exerted excellent thermal stability and solubility in both acidic and basic conditions, which were beneficial to calcium absorption in the gastrointestinal tract of the human body and, therefore, improved its bioavailability. These findings further the progress in the research of whey protein, suggesting the potential in making peptide-calcium chelate as a dietary supplement.
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Affiliation(s)
- Lina Zhao
- College of Bioscience and Biotechnology, Fuzhou University , Fuzhou, Fujian 350002, People's Republic of China
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Leonard S, Cormier A, Pang X, Zimmerman M, Zhou HX, Paravastu A. Solid-state NMR evidence for β-hairpin structure within MAX8 designer peptide nanofibers. Biophys J 2013; 105:222-30. [PMID: 23823242 PMCID: PMC3699732 DOI: 10.1016/j.bpj.2013.05.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 05/13/2013] [Accepted: 05/29/2013] [Indexed: 01/06/2023] Open
Abstract
MAX8, a designer peptide known to undergo self-assembly following changes in temperature, pH, and ionic strength, has demonstrated usefulness for tissue engineering and drug delivery. It is hypothesized that the self-assembled MAX8 nanofiber structure consists of closed β-hairpins aligned into antiparallel β-sheets. Here, we report evidence from solid-state NMR spectroscopy that supports the presence of the hypothesized β-hairpin conformation within the nanofiber structure. Specifically, our (13)C-(13)C two-dimensional exchange data indicate spatial proximity between V3 and K17, and (13)C-(13)C dipolar coupling measurements reveal proximity between the V3 and V18 backbone carbonyls. Moreover, isotopic dilution of labeled MAX8 nanofibers did not result in a loss of the (13)C-(13)C dipolar couplings, showing that these couplings are primarily intramolecular. NMR spectra also indicate the existence of a minor conformation, which is discussed in terms of previously hypothesized nanofiber physical cross-linking and possible nanofiber polymorphism.
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Affiliation(s)
- Sarah R. Leonard
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida
- National High Magnetic Field Laboratory, Tallahassee, Florida
| | - Ashley R. Cormier
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida
- National High Magnetic Field Laboratory, Tallahassee, Florida
| | - Xiaodong Pang
- Department of Physics and Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida
| | - Maxwell I. Zimmerman
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida
- National High Magnetic Field Laboratory, Tallahassee, Florida
| | - Huan-Xiang Zhou
- Department of Physics and Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida
| | - Anant K. Paravastu
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida
- National High Magnetic Field Laboratory, Tallahassee, Florida
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20
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Affiliation(s)
- Shohei Tashiro
- Department of Chemistry, Graduate School of Science, The University of Tokyo
| | - Mitsuhiko Shionoya
- Department of Chemistry, Graduate School of Science, The University of Tokyo
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21
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Enzymatic preparation and characterization of iron-chelating peptides from anchovy (Engraulis japonicus) muscle protein. Food Res Int 2012. [DOI: 10.1016/j.foodres.2012.04.013] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Stoermer MJ, Flanagan B, Beyer RL, Madala PK, Fairlie DP. Structures of peptide agonists for human protease activated receptor 2. Bioorg Med Chem Lett 2012; 22:916-9. [PMID: 22209488 DOI: 10.1016/j.bmcl.2011.12.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2011] [Revised: 12/02/2011] [Accepted: 12/05/2011] [Indexed: 10/14/2022]
Abstract
Protease activated receptor 2 (PAR2) is an unusual G-protein coupled receptor in being self-activated, after pruning of the N-terminus by serine proteases like trypsin and tryptase. Short synthetic peptides corresponding to the newly exposed N-terminal hexapeptide sequence also activate PAR2 on immunoinflammatory, cancer and many normal cell types. (1)H nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy were used here to search for structural clues to activating mechanisms of the hexapeptide agonists SLIGRL (rat), SLIGKV (human) and the peptidomimetic analogue, 2-furoyl-LIGRLO. Either with a free or acetyl capped N-terminus, these agonist peptides display significant propensity in aprotic (DMSO) or lipidic (water-SDS) solvents for turn-like conformations, which are predicted to be receptor-binding conformations in the transmembrane or loops region of PAR2. These motifs may be valuable for the design of small molecule PAR2 agonists and antagonists as prospective new drugs for regulating inflammatory and proliferative diseases.
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Affiliation(s)
- Martin J Stoermer
- Division of Chemistry and Structural Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia.
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23
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Helix Induction by Dirhodium: Access to Biocompatible Metallopeptides with Defined Secondary Structure. Chemistry 2010; 16:6651-9. [DOI: 10.1002/chem.200903092] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Löwik DWPM, Leunissen EHP, van den Heuvel M, Hansen MB, van Hest JCM. Stimulus responsive peptide based materials. Chem Soc Rev 2010; 39:3394-412. [DOI: 10.1039/b914342b] [Citation(s) in RCA: 248] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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25
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Affiliation(s)
- V. Haridas
- Department of Chemistry and School of Biological Sciences, Indian Institute of Technology‐Delhi (IIT‐D), New Delhi‐110 016, India
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Cisnetti F, Gateau C, Lebrun C, Delangle P. Lanthanide(III) Complexes with Two Hexapeptides Incorporating Unnatural Chelating Amino Acids: Secondary Structure and Stability. Chemistry 2009; 15:7456-69. [DOI: 10.1002/chem.200900747] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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27
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Sénèque O, Bonnet E, Joumas FL, Latour JM. Cooperative metal binding and helical folding in model peptides of treble-clef zinc fingers. Chemistry 2009; 15:4798-810. [PMID: 19388025 DOI: 10.1002/chem.200900147] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Two peptides, L(TC) and L(TC)(T) have been synthesised to model the treble-clef zinc fingers encountered in many Zn(Cys)(4)-site-containing proteins. Both are cyclic peptides with a linear tail grafted on a glutamate side chain of the cycle. They differ by the length of this tail, which lacks five amino acids in L(TC)(T) compared to L(TC). Both peptides bind Zn(2+) and Co(2+) in 1:1 metal/peptide ratio and the structure of these complexes have been characterised by NMR, UV/Vis and CD spectroscopy. Both peptides fold the same way around the metal ion and they fully reproduce the classical fold of treble-clef zinc fingers and display an extended hydrogen-bond network around the coordinating sulfur atoms. The structures of the ML(TC) complexes reveal that the linear tail forms a short two-turn alpha-helix, present in the metallated form only. The formation of this helix constitutes a rare example of metal-induced folding. The second turn of this helix is composed of the five amino acids that are absent in L(TC)(T). The study of the pH-dependence of the Zn(2+) binding constants shows that the metal ion is bound by four cysteinates above pH 5.2 and the binding constants are the highest reported so far. Interestingly, the binding constant of Zn x L(TC) is about tenfold higher than that of Zn x L(TC)(T). This difference clearly indicates that the helix, present in Zn x L(TC) only, stabilises the Zn(2+) complex by about 1.2 kcal mol(-1). The origin of this stabilisation is ascribed to an electrostatic interaction between the [ZnS(4)](2-) centre and the helix. This reveals a cooperative effect: zinc binding allows the folding of the tail into a helix which, in turn, strengthens the zinc complex.
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Affiliation(s)
- Olivier Sénèque
- Laboratoire de Chimie et Biologie des Métaux, CNRS UMR 5249, 17, rue des Martyrs, 38054 Grenoble, France.
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Ma MT, Hoang HN, Scully CCG, Appleton TG, Fairlie DP. Metal Clips That Induce Unstructured Pentapeptides To Be α-Helical In Water. J Am Chem Soc 2009; 131:4505-12. [DOI: 10.1021/ja900047w] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michelle T. Ma
- School of Chemistry and Molecular Biosciences, and Institute for Molecular Bioscience, The University of Queensland, Brisbane Qld 4072, Australia
| | - Huy N. Hoang
- School of Chemistry and Molecular Biosciences, and Institute for Molecular Bioscience, The University of Queensland, Brisbane Qld 4072, Australia
| | - Conor C. G. Scully
- School of Chemistry and Molecular Biosciences, and Institute for Molecular Bioscience, The University of Queensland, Brisbane Qld 4072, Australia
| | - Trevor G. Appleton
- School of Chemistry and Molecular Biosciences, and Institute for Molecular Bioscience, The University of Queensland, Brisbane Qld 4072, Australia
| | - David P. Fairlie
- School of Chemistry and Molecular Biosciences, and Institute for Molecular Bioscience, The University of Queensland, Brisbane Qld 4072, Australia
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29
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A 310-helix single turn enforced by crosslinking of lysines with 1,1′-ferrocenedicarboxylic acid. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.11.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Moriuchi T, Fujiwara T, Hirao T. β-Turn-structure-assembled palladium complexes by complexation-induced self-organization of ferrocene–dipeptide conjugates. Dalton Trans 2009:4286-8. [DOI: 10.1039/b817652c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Hoang HN, Bryant GK, Kelso MJ, Beyer RL, Appleton TG, Fairlie DP. Linkage isomerism in the binding of pentapeptide Ac-His(Ala)3His-NH2 to (ethylenediamine)palladium(II): effect of the binding mode on peptide conformation. Inorg Chem 2008; 47:9439-49. [PMID: 18788796 DOI: 10.1021/ic800970p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of the pentapeptide Ac-His1-Ala2-Ala3-Ala4-His5-NH2 (AcHAAAHNH2) (1) with [Pd(en)(ONO2)2] (en = NH2CH2CH2NH2) in either DMF-d(7) or H2O:D2O (90%:10%) gave three linkage isomers of [Pd(en)(AcHAAAHNH2)](2+) (2), 2a, 2b, and 2c, which differ only in which pair of imidazole nitrogen atoms bind to Pd. In the most abundant isomer, 2a, Pd is bound by N1 from each of the two imidazole rings. In the minor isomers 2b and 2c, Pd is bound by N1(His1) and N3(His5) and by N3(His1) and N1(His5), respectively. The reactions of [Pd(en)(ONO2)2] with the N-methylated peptides Ac-(N3-MeHis)-Ala-Ala-Ala-(N3-MeHis)-NH2 (AcH*AAAH*NH2) (3), Ac-(N3-MeHis)-Ala-Ala-Ala-(N1-MeHis)-NH2 (AcH(*)AAAH(#)NH2) (4), and Ac-(N1-MeHis)-Ala-Ala-Ala-(N3-Me-His)-NH2 (AcH(#)AAAH(*)NH2) (5) each gave a single species [Pd(en)(peptide)](2+) in N,N-dimethylformamide (DMF) or aqueous solution, 7, 8, and 9, respectively, with Pd bound by the two nonmethylated imidazole nitrogen atoms in each case. These complexes were analogous to 2a, 2b, and 2c, respectively. Ac-(N1-MeHis)-Ala-Ala-Ala-(N1-MeHis)-NH2 (AcH(#)AAAH(#)NH2) (6) with [Pd(en)(ONO2)2] in DMF slowly gave a single product, [Pd(en)(AcH(#)AAAH(#)NH2)](2+) (10), in which Pd was bound by the N3 of each imidazole ring. The corresponding linkage isomer of 2 was not observed. Complex 10 was also the major product in aqueous solution, but other species were also present. All compounds were exhaustively characterized in solution by multinuclear 1D ((1)H , (13)C, and, with (15)N-labeled ethylenediamine, (15)N) and 2D (correlation spectroscopy, total correlation spectroscopy, transverse rotating-frame Overhauser effect spectroscopy (T-ROESY), heteronuclear multiple-bond correlation, and heteronuclear single quantum coherence) NMR spectra, circular dichroism (CD) spectra, electrospray mass spectroscopy, and reversed-phase high-performance liquid chromatography. ROESY spectra were used to calculate the structure of 2a, which contained a single turn of a peptide alpha helix in both DMF and water, the helix being better defined in DMF. The Pd(en)(2+) moiety was not used in structure calculations, but its location and coordination by one imidazole N1 from each histidine to form a 22-membered metallocycle were unambiguously established. Convergence of the structures was greatest when calculated with two hydrogen-bond constraints (Ala4 peptide NH...OC acetyl and His5 peptide NH...OC-His1) that were indicated by the low temperature dependence of these NH chemical shifts. Vicinal HN-CHalpha coupling constants and chemical shifts of alpha-H atoms were also consistent with a helical conformation. Similar long-range ROE correlations were observed for [Pd(en)(AcH(*)AAAH(*)NH2)](2+) (7), which displayed a CD spectrum in aqueous solution that suggested the presence of some helicity. Long-range ROE correlations were not observed for 8, 9, or 10, but a combination of NMR data and CD spectroscopy was interpreted in terms of the conformational behavior of the coordinated pentapeptide. Only for the linkage isomer [Pd(en)(AcH(*)AAAH(#)NH2)](2+) (8) was there evidence of a contribution from a helical conformation. The data for 8 were interpreted as interconversion between the helix and random coil conformations. Zn(2+) with peptides gave broad NMR peaks attributed to lability of this metal ion, while reactions of cis-[Pt(NH3)2(ONO2)2] were slow, giving a complex mixture of products rather than the macrochelate ring observed with Pd(en)(2+). In summary, these studies indicate that Pd(en)(2+) coordinates to histidine with similar preference for each of the two imidazole nitrogens, enabling the formation of up to four linkage isomers in its complexes with pentapeptides His-xxx-His. Only the N1-N1 linkage isomer that forms a 22-membered macrochelate ring is able to induce an alpha-helical peptide conformation, whereas the 20- and 21-membered rings of linkage isomers do not. This suggests that linkage isomeric mixtures may compromise histidine coordination to metal ions and reduce alpha-helicity.
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Affiliation(s)
- Huy N Hoang
- Centre for Metals in Biology, School of Molecular & Microbial Sciences, The University of Queensland, Brisbane, Qld., Australia 4072
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Ousaka N, Tani N, Sekiya R, Kuroda R. Decelerated chirality interconversion of an optically inactive 310-helical peptide by metal chelation. Chem Commun (Camb) 2008:2894-6. [DOI: 10.1039/b803080d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Garner J, Harding MM. Design and synthesis of alpha-helical peptides and mimetics. Org Biomol Chem 2007; 5:3577-85. [PMID: 17971985 DOI: 10.1039/b710425a] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The alpha-helix is the most abundant secondary structural element in proteins and is an important structural domain for mediating protein-protein and protein-nucleic acid interactions. Strategies for the rational design and synthesis of alpha-helix mimetics have not matured as well as other secondary structure mimetics such as strands and turns. This perspective will focus on developments in the design, synthesis and applications of alpha-helices and mimetics, particularly in the last 5 years. Examples where synthetic compounds have delivered promising biological results will be highlighted as well as opportunities for the design of mimetics of the type I alpha-helical antifreeze proteins.
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Affiliation(s)
- James Garner
- School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia
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34
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Moriuchi T, Fujiwara T, Hirao T. Complexation-induced conformational regulation of ferrocene-dipeptide conjugates to nucleate γ-turn-like structure. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.10.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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