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Thermoresponsive Polymer Assemblies: From Molecular Design to Theranostics Application. Prog Polym Sci 2022. [DOI: 10.1016/j.progpolymsci.2022.101578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Abstract
Collagen-like peptides (CLPs), also known as collagen-mimetic peptides (CMPs), are short synthetic peptides that mimic the triple helical conformation of native collagens. Traditionally, CLPs have been widely used in deciphering the chemical basis for collagen triple helix stabilization, mimicking collagen fibril formation and fabricating other higher-order supramolecular self-assemblies. While CLPs have been used extensively for elucidation of the assembly of native collagens, less work has been reported on the use of CLP-polymer and CLP-peptide conjugates in the production of responsive assemblies. CLP triple helices have been used as physical cross-links in CLP-polymer hydrogels with predesigned thermoresponsiveness. The more recently reported ability of CLP to target native collagens via triple helix hybridization has further inspired the production of CLP-polymer and CLP-peptide bioconjugates and the employment of these conjugates in generating well-defined nanostructures for targeting collagen substrates. This review summarizes the current progress and potential of using CLPs in biomedical arenas and is intended to serve as a general guide for designing CLP-containing biomaterials.
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Affiliation(s)
| | - Kristi L Kiick
- Delaware Biotechnology Institute , Newark, Delaware 19711, United States
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3
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Lei WW, Shi LY, Li H, Li CX, Diao YF, Zhang YL, Ran R. A novel self-assembled hybrid organogel of polypeptide-based block copolymers with inclusion of polypeptide-functionalized graphene. RSC Adv 2017. [DOI: 10.1039/c6ra24677j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Self-assembled hybrid organogels of polypeptide-based BCPs with incorporation of functionalized graphene were generated, and showed enhanced mechanical performance for the potential nanomaterials application.
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Affiliation(s)
- Wei-Wei Lei
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Ling-Ying Shi
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Hang Li
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Chen-Xi Li
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Yong-Fu Diao
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Yu-Lin Zhang
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Rong Ran
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
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4
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Ma D, DeBenedictis EP, Lund R, Keten S. Design of polymer conjugated 3-helix micelles as nanocarriers with tunable shapes. NANOSCALE 2016; 8:19334-19342. [PMID: 27841426 DOI: 10.1039/c6nr07125b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Amphiphilic peptide-polymer conjugates have the ability to form stable nanoscale micelles, which show great promise for drug delivery and other applications. A recent design has utilized the end-conjugation of alkyl chains to 3-helix coiled coils to achieve amphiphilicity, combined with the side-chain conjugation of polyethylene glycol (PEG) to tune micelle size through entropic confinement forces. Here we investigate this phenomenon in depth, using coarse-grained dissipative particle dynamics (DPD) simulations in an explicit solvent and micelle theory. We analyze the conformations of PEG chains conjugated to three different positions on 3-helix bundle peptides to ascertain the degree of confinement upon assembly, as well as the ordering of the subunits making up the micelle. We discover that the micelle size and stability is dictated by a competition between the entropy of PEG chain conformations in the assembled state, as well as intermolecular cross-interactions among PEG chains that promote cohesion between neighboring conjugates. Our analyses build on the role of PEG molecular weight and conjugation site and lead to computational phase diagrams that can be used to design 3-helix micelles. This work opens pathways for the design of multifunctional micelles with tunable size, shape and stability.
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Affiliation(s)
- Dan Ma
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA.
| | | | - Reidar Lund
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Sinan Keten
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA. and Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, USA
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DeBenedictis EP, Hamed E, Keten S. Mechanical Reinforcement of Proteins with Polymer Conjugation. ACS NANO 2016; 10:2259-2267. [PMID: 26687555 DOI: 10.1021/acsnano.5b06917] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Conjugating poly(ethylene glycol) (PEG) to peptides, also known as PEGylation, is proven to increase the thermodynamical stability of peptides, and has been successfully applied to prolong the lifetime of peptide-based vaccines and therapeutic agents. While it is known that protein structure and function can be altered by mechanical stress, whether PEGylation can reinforce proteins against mechanical unfolding remains to be ascertained. Here, we illustrate that PEGylation prolongs the lifetime of α-helices subject to constant stress. PEGylation is found to increase the unfolding time through two mechanisms. We see that (1) the unfolding rate of a helical segment is decreased through prolonged plateau regimes where the peptide helical content remains constant, and (2) the proportion of refolding to unfolding is increased, primarily by shielding water molecules from replacing forcibly exposed backbone hydrogen bonds near the conjugation site. Our findings demonstrate the feasibility of improving peptide mechanical stability with polymer conjugation. This provides a basis for future studies on optimizing conjugation location and chemistry to build custom biomolecules with unforeseen mechanical functions and stability.
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Affiliation(s)
- Elizabeth P DeBenedictis
- Department of Civil and Environmental Engineering and Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Elham Hamed
- Department of Civil and Environmental Engineering and Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States
| | - Sinan Keten
- Department of Civil and Environmental Engineering and Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States
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Mohamed MG, Tu JH, Huang SH, Chiang YW, Kuo SW. Hydrogen bonding interactions affect the hierarchical self-assembly and secondary structures of comb-like polypeptide supramolecular complexes displaying photoresponsive behavior. RSC Adv 2016. [DOI: 10.1039/c6ra07907e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Hierarchical lamellae-within-lamellae structure for the PTyr/AzoPy-C16 supramolecular complex, featuring long-range-ordered lamellae arising from the PTyr within lamellae arising from AzoPy-C16 units oriented in a perpendicular manner.
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Affiliation(s)
- Mohamed Gamal Mohamed
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung
- Taiwan
| | - Jia-Huei Tu
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung
- Taiwan
| | - Shih-Hung Huang
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung
- Taiwan
| | - Yeo-Wan Chiang
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung
- Taiwan
| | - Shiao-Wei Kuo
- Department of Materials and Optoelectronic Science
- Center for Functional Polymers and Supramolecular Materials
- National Sun Yat-Sen University
- Kaohsiung
- Taiwan
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7
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Hierarchical cascades of instability govern the mechanics of coiled coils: helix unfolding precedes coil unzipping. Biophys J 2015; 107:477-484. [PMID: 25028889 DOI: 10.1016/j.bpj.2014.06.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 05/13/2014] [Accepted: 06/03/2014] [Indexed: 12/31/2022] Open
Abstract
Coiled coils are a fundamental emergent motif in proteins found in structural biomaterials, consisting of α-helical secondary structures wrapped in a supercoil. A fundamental question regarding the thermal and mechanical stability of coiled coils in extreme environments is the sequence of events leading to the disassembly of individual oligomers from the universal coiled-coil motifs. To shed light on this phenomenon, here we report atomistic simulations of a trimeric coiled coil in an explicit water solvent and investigate the mechanisms underlying helix unfolding and coil unzipping in the assembly. We employ advanced sampling techniques involving steered molecular dynamics and metadynamics simulations to obtain the free-energy landscapes of single-strand unfolding and unzipping in a three-stranded assembly. Our comparative analysis of the free-energy landscapes of instability pathways shows that coil unzipping is a sequential process involving multiple intermediates. At each intermediate state, one heptad repeat of the coiled coil first unfolds and then unzips due to the loss of contacts with the hydrophobic core. This observation suggests that helix unfolding facilitates the initiation of coiled-coil disassembly, which is confirmed by our 2D metadynamics simulations showing that unzipping of one strand requires less energy in the unfolded state compared with the folded state. Our results explain recent experimental findings and lay the groundwork for studying the hierarchical molecular mechanisms that underpin the thermomechanical stability/instability of coiled coils and similar protein assemblies.
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Zhang Q, Li M, Zhu C, Nurumbetov G, Li Z, Wilson P, Kempe K, Haddleton DM. Well-Defined Protein/Peptide–Polymer Conjugates by Aqueous Cu-LRP: Synthesis and Controlled Self-Assembly. J Am Chem Soc 2015; 137:9344-53. [DOI: 10.1021/jacs.5b04139] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Qiang Zhang
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - Muxiu Li
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - Chongyu Zhu
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - Gabit Nurumbetov
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - Zaidong Li
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - Paul Wilson
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - Kristian Kempe
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
| | - David M. Haddleton
- Department of Chemistry, University of Warwick, CV4 7AL, Coventry, United Kingdom
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9
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Hamed E, Ma D, Keten S. Effect of Polymer Conjugation Site on Stability and Self-Assembly of Coiled Coils. BIONANOSCIENCE 2015. [DOI: 10.1007/s12668-015-0172-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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10
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Hamed E, Ma D, Keten S. Multiple PEG Chains Attached onto the Surface of a Helix Bundle: Conformations and Implications. ACS Biomater Sci Eng 2015. [DOI: 10.1021/ab500088b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Elham Hamed
- Department of Civil and Environmental
Engineering and Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Dan Ma
- Department of Civil and Environmental
Engineering and Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Sinan Keten
- Department of Civil and Environmental
Engineering and Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, United States
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11
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Luo T, Kiick KL. Collagen-like peptides and peptide–polymer conjugates in the design of assembled materials. Eur Polym J 2013; 49:2998-3009. [DOI: 10.1016/j.eurpolymj.2013.05.013] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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