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Biswas R, Banerjee S. Luminescence Sensing of Biomacromolecules Heparin and Protamine in 100% Human Serum and Plasma by Supramolecular Polymeric Assemblies. Biomacromolecules 2023; 24:766-774. [PMID: 36627763 DOI: 10.1021/acs.biomac.2c01219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Heparin, an anionic biomacromolecule, is routinely used as an anticoagulant during medical surgery to prevent blood clot formation and in the treatment of several heart, lung, and circulatory disorders having a higher risk of blood clotting. We herein report supramolecular polymeric nanoassemblies of cationic pyrene-tagged bis-imidazolium amphiphiles for heparin detection with high sensitivity and selectivity in aqueous buffer, plasma, and serum media. The nano-assemblies exhibited cyan-green excimeric emission in aqueous media, and their multivalent array of positive surface charges allowed them to form co-assemblies with heparin, resulting in significantly enhanced emission. This provided a convenient method for heparin detection in buffer at nanomolar concentrations, and most notably, a ratiometric fluorescence response was obtained even in highly competitive 100% human serum and 100% human plasma in a clinically relevant concentration range. Moreover, using the heparin-based luminescent co-assemblies, protamine sulfate, a clinically administered antidote to heparin, was also detected in 100% human serum and 100% human plasma at sub-micromolar concentrations.
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Affiliation(s)
- Rakesh Biswas
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Nadia, Mohanpur 741246, India
| | - Supratim Banerjee
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Nadia, Mohanpur 741246, India
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2
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Zhao D, Zhou J. Electrostatics-mediated α-chymotrypsin inhibition by functionalized single-walled carbon nanotubes. Phys Chem Chem Phys 2017; 19:986-995. [DOI: 10.1039/c6cp04962a] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Electrostatics-mediated α-chymotrypsin inhibition by functionalized single-walled carbon nanotubes.
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Affiliation(s)
- Daohui Zhao
- School of Chemistry and Chemical Engineering
- Guangdong Provincial Key Lab for Green Chemical Product Technology
- South China University of Technology
- Guangzhou
- P. R. China
| | - Jian Zhou
- School of Chemistry and Chemical Engineering
- Guangdong Provincial Key Lab for Green Chemical Product Technology
- South China University of Technology
- Guangzhou
- P. R. China
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Raghupathi KR, Guo J, Munkhbat O, Rangadurai P, Thayumanavan S. Supramolecular disassembly of facially amphiphilic dendrimer assemblies in response to physical, chemical, and biological stimuli. Acc Chem Res 2014; 47:2200-11. [PMID: 24937682 PMCID: PMC4100797 DOI: 10.1021/ar500143u] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
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Supramolecular assemblies formed from spontaneous self-assembly
of amphiphilic macromolecules are explored as biomimetic architectures
and for applications in areas such as sensing, drug delivery, and
diagnostics. Macromolecular assemblies are usually preferred, compared
with their simpler small molecule counterparts, due to their low critical
aggregate concentrations (CAC) and high thermodynamic stability. This
Account focuses on the structural and functional aspects of assemblies
formed from dendrimers, specifically facially amphiphilic dendrons
that form micelle or inverse micelle type supramolecular assemblies
depending on the nature of the solvent medium. The micelle type
assemblies formed from facially amphiphilic dendrons
sequester hydrophobic guest molecules in their interiors. The stability
of these assemblies is dependent on the relative compatibility of
the hydrophilic and hydrophobic functionalities with water, often
referred to as hydrophilic–lipophilic balance (HLB). Disruption
of the HLB, using an external stimulus, could lead to disassembly
of the aggregates, which can then be utilized to cause an actuation
event, such as guest molecule release. Studying these possibilities
has led to (i) a robust and general strategy for stimulus-induced
disassembly and molecular release and (ii) the introduction of a new
approach to protein-responsive supramolecular disassembly. The latter
strategy provides a particularly novel avenue for impacting biomedical
applications. Most of the stimuli-sensitive supramolecular assemblies
have been designed to be responsive to factors such pH, temperature,
and redox conditions. The reason for this interest stems from the
fact that certain disease microenvironments have aberrations in these
factors. However, these variations are the secondary imbalances in
biology. Imbalances in protein activity are the primary reasons for
most, if not all, human pathology. There have been no robust strategies
in stimulus-responsive assemblies that respond to these variations.
The facially amphiphilic dendrimers provide a unique opportunity to
explore this possibility. Similarly, the propensity of these
molecules to form inverse micelles
in apolar solvents and thus bind polar guest molecules, combined with
the fact that these assemblies do not thermodynamically equilibrate
in biphasic mixtures, was used to predictably simplify peptide mixtures.
The structure–property relationships developed from these studies
have led to a selective and highly sensitive detection of peptides
in complex mixtures. Selectivity in peptide extraction was achieved
using charge complementarity between the peptides and the hydrophilic
components present in inverse micellar interiors. These findings will
have implications in areas such as proteomics and biomarker detection.
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Affiliation(s)
- Krishna R. Raghupathi
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Jing Guo
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Oyuntuya Munkhbat
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Poornima Rangadurai
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - S. Thayumanavan
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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Amado Torres D, Garzoni M, Subrahmanyam AV, Pavan GM, Thayumanavan S. Protein-triggered supramolecular disassembly: insights based on variations in ligand location in amphiphilic dendrons. J Am Chem Soc 2014; 136:5385-99. [PMID: 24641469 PMCID: PMC4004214 DOI: 10.1021/ja500634u] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Indexed: 12/14/2022]
Abstract
We use monodisperse dendrons that allow control over functional group presentation to investigate the influence of the location of a ligand on protein-induced disassembly and release of encapsulated small molecules. Based on both experiments and molecular dynamics simulations, we demonstrate that ligand location greatly influences release of guest molecules from the dendron-based supramolecular assembly. We show that a ligand moiety grafted to the dendron periphery is more accessible for the target protein in aqueous solution. On the other hand, the ligand moiety placed at the focal point or at the intermediate layer within the dendritic scaffold is less accessible, since it is surrounded by an environment rich in PEG chains, which hinders binding and even influences nonspecific interactions. We also demonstrate that the specific binding between one ligand and the target protein can destabilize the dendritic assembly. Furthermore, if more ligands are available, multivalent interactions are also possible with extravidin, which speed up disassembly and trigger the release of hydrophobic guests.
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Affiliation(s)
- Diego Amado Torres
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Matteo Garzoni
- Department
of Innovative Technologies, University of
Applied Science of Southern Switzerland, Manno 6928, Switzerland
| | - Ayyagari V. Subrahmanyam
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Giovanni M. Pavan
- Department
of Innovative Technologies, University of
Applied Science of Southern Switzerland, Manno 6928, Switzerland
| | - S. Thayumanavan
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
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Kurinomaru T, Tomita S, Hagihara Y, Shiraki K. Enzyme hyperactivation system based on a complementary charged pair of polyelectrolytes and substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3826-3831. [PMID: 24635224 DOI: 10.1021/la500575c] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Artificial enzyme activators are of great interest for enzyme applications in a wide range of research fields. Here, we report an enzyme hyperactivation system using polyelectrolytes that are complementary to charged substrates. The enzyme activity of α-chymotrypsin (ChT) for a cationic substrate increased 7-fold at pH 7.0 in the presence of anionic poly(acrylic acid) (PAAc) and for an anionic substrate increased 18-fold at pH 7.0 in the presence of cationic poly(allylamine) (PAA). Analysis of salt and pH effects, enzyme kinetics, dynamic light scattering (DLS), and circular dichroism (CD) indicated that the enzyme activation results from favorable electrostatic interactions between oppositely charged substrates and polyelectrolytes surrounding the enzymes. This hyperactivation system does not require laborious mutagenesis or chemical modification of enzymes and thus is relevant to a number of applications.
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Affiliation(s)
- Takaaki Kurinomaru
- Faculty of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Song C, Wang GY, Wang HZ, Wang YJ, Kong DM. Applications of porous organic frameworks (POFs) in detection of nucleic acid and exonuclease I activity. J Mater Chem B 2014; 2:1549-1556. [DOI: 10.1039/c3tb21461c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zheng C, Zhang XL, Liu W, Liu B, Yang HH, Lin ZA, Chen GN. A selective artificial enzyme inhibitor based on nanoparticle-enzyme interactions and molecular imprinting. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:5922-7. [PMID: 23955936 DOI: 10.1002/adma.201302064] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 07/11/2013] [Indexed: 05/25/2023]
Abstract
A novel and general strategy is developed to design selective artificial enzyme inhibitor based on nanoparticleenzyme inter actions and molecular imprinting. Due to the creation of specific binding cavities, the resulting artificial inhibitor has high inhibition efficiency for the target enzyme, and shows great target-selectivity over other enzymes of similar function and proteins of compaable mole cular weight.
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Affiliation(s)
- Cheng Zheng
- The Key Lab of Analysis Technology for Food Safety of the MOE, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, 350108, P. R. China
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Ramireddy RR, Subrahmanyam AV, Thayumanavan S. Zwitterionic moieties from the Huisgen reaction: a case study with amphiphilic dendritic assemblies. Chemistry 2013; 19:16374-81. [PMID: 24151036 DOI: 10.1002/chem.201302442] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Indexed: 11/12/2022]
Abstract
Supramolecular nano-assemblies that reduce nonspecific interactions with biological macromolecules, such as proteins, are of great importance for various biological applications. Recently, zwitterionic materials have been shown to reduce nonspecific interactions with biomolecules, owing both to their charge neutrality and their ability to form a strong hydration layer around zwitterions via electrostatic interactions. Here, new triazole-based zwitterionic moieties are presented that are incorporated as the hydrophilic functionalities in facially amphiphilic dendrons. The amphiphilic zwitterionic dendrons spontaneously self-assemble in aqueous solutions forming micelle-type aggregates, which were confirmed by DLS, TEM, and fluorescence techniques. The structural and functional characteristics of the zwitterionic dendrons are also compared with the corresponding charge-neutral PEG-based dendrons and anionic carboxylate-based dendrons. Surface-charge measurements, temperature sensitivity and evaluation of interactions of these assemblies with proteins form the bases for these comparisons.
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11
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Davis BW, Niamnont N, Dillon R, Bardeen CJ, Sukwattanasinitt M, Cheng Q. FRET detection of proteins using fluorescently doped electrospun nanofibers and pattern recognition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6401-8. [PMID: 21491867 DOI: 10.1021/la2006925] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
This paper reports the fabrication of solid-state nanofiber sensor arrays and their use for detection of multiple proteins using principal component analysis (PCA). Four cationic and anionic fluorescently embedded nanofibers are generated by an electrospinning method, yielding unique patterns of fluorescence change upon interaction with protein samples. Five metal and nonmetal containing proteins, i.e., hemoglobin, myoglobin, cytochrome c, BSA, and avidin, have been investigated; and the results show that distinct fluorescent patterns can be formed upon the addition of protein samples to the array of solid nanofiber substrates, allowing their unambiguous identification. The nanofiber films are highly repeatable with a batch-to-batch variation of approximately 5% and demonstrated outstanding reusability with less than a 15% loss of fluorescence intensity signal after 5 regenerations of test cycles. For a more practical visualization, a cluster map was generated using PCA of the change-in-fluorescence (ΔI) composite patterns, demonstrating the potential of the method for diagnostic applications.
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Affiliation(s)
- Bryce W Davis
- Department of Chemistry, University of California, Riverside, California 92521, United States
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12
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Davis BW, Niamnont N, Hare CD, Sukwattanasinitt M, Cheng Q. Nanofibers doped with dendritic fluorophores for protein detection. ACS APPLIED MATERIALS & INTERFACES 2010; 2:1798-1803. [PMID: 20586426 DOI: 10.1021/am100345g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report a solid-state, nanofiber-based optical sensor for detecting proteins with an anionic fluorescent dendrimer (AFD). The AFD was encapsulated in cellulose acetate (CA) electrospun nanofibers, which were deacetylated to cellulose to generate secondary porous structures that are desirable for enhancing molecular interactions, and thus better signaling. The protein sensing properties of the fibers were characterized by monitoring the fluorescence response of cytochrome c (cyt c), hemoglobin (Hgb), and bovine serum albumin (BSA) as a function of concentration. Effective quenching was observed for the metalloproteins, cyt c and Hgb. The effect was primarily due to energy transfer of the imbedded fluorescent dendrimers to the protein, as both proteins contain heme portions. Electron transfer, caused through the electrostatic effects in the binding of the anionic dendrimer to the positive patches of globular proteins, could be responsible as well. BSA, on the other hand, triggered a "turn-on" response in fluorescence, suggesting the negatively charged BSA reduces the pi-pi stacking of the partially dispersed, negatively charged dendritic fluorophores through repulsion forces, which results in an increase in fluorescence. Stern-Volmer constants (K(sv)) of the electrospun fibers were found to be 3.4 x 10(5) and 1.7 x 10(6) M(-1) for cyt c and Hgb, respectively. The reusability of the nanofibers is excellent: the nanofibers demonstrated less than 15% change of fluorescence intensity signal in a 5-cycle test.
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Seo M, Kim JH, Kim J, Park N, Park J, Kim SY. Self-Association of Bis-Dendritic Organogelators: The Effect of Dendritic Architecture on Multivalent Cooperative Interactions. Chemistry 2010; 16:2427-41. [DOI: 10.1002/chem.200902575] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Chiba F, Mann G, Twyman LJ. Investigating possible changes in protein structure during dendrimer–protein binding. Org Biomol Chem 2010; 8:5056-8. [DOI: 10.1039/c0ob00041h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Yuan Z, Zheng S, Zeng Y, Chen J, Han Y, Li Y, Li Y. Photosensitized oxidation of alkenes with dendrimers as microreactors: controllable selectivity between energy and electron transfer pathway. NEW J CHEM 2010. [DOI: 10.1039/b9nj00786e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ohkanda J, Satoh R, Kato N. Protein surface recognition by dendritic ruthenium(II) tris(bipyridine) complexes. Chem Commun (Camb) 2009:6949-51. [PMID: 19904357 DOI: 10.1039/b914770e] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report protein surface binding of dendritic ruthenium(ii) tris(bipyiridine) complexes to alpha-chymotrypsin, resulting in a 1 : 1 and 1 : 2 protein complex formation as well as inhibition of the enzyme activity.
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Affiliation(s)
- Junko Ohkanda
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
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Savariar EN, Koppelman J, Thayumanavan S. Supramolecular Assemblies from Amphiphilic Dendrons for Sensing Metalloproteins through Pattern Generation. Isr J Chem 2009. [DOI: 10.1560/ijc.49.1.41] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Jiwpanich S, Sandanaraj BS, Thayumanavan S. Fluorophore-cored dendrimers for patterns in metalloprotein sensing. Chem Commun (Camb) 2009:806-8. [DOI: 10.1039/b815263b] [Citation(s) in RCA: 23] [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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Savariar E, Sochat M, Klaikherd A, Thayumanavan S. Functional Group Density and Recognition in Polymer Nanotubes. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200804136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Savariar E, Sochat M, Klaikherd A, Thayumanavan S. Functional Group Density and Recognition in Polymer Nanotubes. Angew Chem Int Ed Engl 2008; 48:110-4. [DOI: 10.1002/anie.200804136] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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21
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Gomez-Escudero A, Azagarsamy MA, Theddu N, Vachet RW, Thayumanavan S. Selective peptide binding using facially amphiphilic dendrimers. J Am Chem Soc 2008; 130:11156-63. [PMID: 18661986 DOI: 10.1021/ja803082v] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amphiphilic dendrimers, which contain both hydrophobic and hydrophilic groups in every repeat unit, exhibit environment-dependent assemblies both in hydrophilic solvent, water, and in lipophilic solvent, toluene. Upon investigating the status of these assemblies in a mixture of immiscible solvents, these dendrimers were found to be kinetically trapped in the solvent in which they are initially assembled. This property has been exploited to selectively extract peptides from aqueous solution into an organic phase, where the peptides bind to the interior functionalities of the dendritic inverse micelles. While the corresponding small molecule surfactant does not exhibit any selective binding toward peptides, all dendrons (G1-G3) are capable of this selective binding. We show that the inverse micelle-type assembly itself is crucial for the binding event and that the assembly formed by the G1 dendron has a greater capability for binding compared to the G2 or G3 dendrons. We have also shown that the average apparent pKa of the carboxylic acid functionalities varies with generation, and this could be the reason for the observed differences in binding capacity.
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Affiliation(s)
- Andrea Gomez-Escudero
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
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Kano K, Watanabe K, Ishida Y. Porphyrin J-Aggregates Stabilized by Ferric Myoglobin in Neutral Aqueous Solution. J Phys Chem B 2008; 112:14402-8. [DOI: 10.1021/jp802567b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Koji Kano
- Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Kenji Watanabe
- Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Yoshiyuki Ishida
- Department of Molecular Chemistry and Biochemistry, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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Kano K, Ishida Y. Regulation of α-Chymotrypsin Catalysis by Ferric Porphyrins and Cyclodextrins. Chem Asian J 2008; 3:678-86. [DOI: 10.1002/asia.200700383] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Willham KA, Laurent BA, Grayson SM. Synthesis of a pH-independent bifurcated amphiphile. Tetrahedron Lett 2008; 49:2091-2094. [PMID: 19325700 DOI: 10.1016/j.tetlet.2008.01.132] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
An efficient synthetic method for preparing bifurcated amphiphiles has been developed such that the functionality for attachment is located at the interface between the lipophilic and hydrophilic side chains. Attachment of the amphiphile to the repeat units of polymeric substrates enables the rapid preparation of amphiphilic homopolymers.
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Chiba F, Hu TC, Twyman LJ, Wagstaff M. Dendrimers as size selective inhibitors to protein–protein binding. Chem Commun (Camb) 2008:4351-3. [DOI: 10.1039/b806517a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Kulkarni MM, Bandyopadhyaya R, Sharma A. Janus silica film with hydrophobic and hydrophilic surfaces grown at an oil–water interface. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b713074k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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You CC, Agasti S, Rotello V. Isomeric Control of Protein Recognition with Amino Acid- and Dipeptide-Functionalized Gold Nanoparticles. Chemistry 2007; 14:143-50. [DOI: 10.1002/chem.200701234] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Hayashida O, Ogawa N, Uchiyama M. Surface recognition and fluorescence sensing of histone by dansyl-appended cyclophane-based resorcinarene trimer. J Am Chem Soc 2007; 129:13698-705. [PMID: 17929813 DOI: 10.1021/ja074906h] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A cyclophane-based resorcinarene trimer (3) bearing a dansyl moiety as an environmentally sensitive fluorophore was prepared by stepwise condensation of a tetraaza[6.1.6.1]paracyclophane skeleton with a dansyl moiety and three resorcinarene derivatives having heptacarboxylic acid residues in this sequence. The dansyl-appended cyclophane exhibited the following fluorescence properties regarding solvent polarity dependency and histone surface recognition: With increasing dioxane contents in dioxane/water solvents, the fluorescence intensity originating from the dansyl moiety of 3 increased along with a concomitant blue shift of the fluorescence maximum (lambdaem). The microenvironmentally sensitive fluorescence properties of dansyl fluorophore were maintained, even when the dansyl moiety was covalently attached to a cyclophane. Most interestingly, the cyclophane-based resorcinarene trimer exhibited recognition and fluorescence sensing capabilities toward histone, a small basic protein of eukaryotic chromatins. The fluorescence intensity originating from 3 increased along with a concomitant blue shift of lambdaem upon the addition of histone, reflecting the formation of 3-histone complexes. A relatively large fluorescence polarization (P) value was obtained for the 3-histone complexes (0.15), reflecting highly restricted conformations of 3, and the obtained P value was much larger than that of 3 alone in aqueous medium (0.07). The binding constant (K) of 3 with histone (unit basis) was estimated to be 2.1 x 106 M-1. On the other hand, upon the addition of acetylated histone (Ac-histone) to an aqueous solution containing 3, the extent of change in fluorescence intensity originating from the dansyl group of 3 was almost negligible, indicating that the electrostatic interactions between 3 and Ac-histone were weak. In addition, the fluorescence spectral changes were also small or negligible upon the addition of other proteins such as albumin, ovalbumin, peanut agglutinin, myoglobin, concanavalin A, cytochrome c, and lysozyme, having isoelectric points of 4.7, 4.8, 5.7-6.7, 6.8, 7.1, 9, and 11.0, respectively, to an aqueous solution containing 3.
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Affiliation(s)
- Osamu Hayashida
- Institute for Materials Chemistry and Engineering, Kyushu University, Moto-oka 744, Fukuoka, Japan.
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Ambade AV, Aathimanikandan SV, van der Poll D, Thayumanavan S. Smaller building blocks form larger assemblies: aggregation behavior of biaryl-based dendritic facial amphiphiles. J Org Chem 2007; 72:8167-74. [PMID: 17915918 DOI: 10.1021/jo070447r] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis and micellar behavior of biaryl-based benzyl ether dendritic molecules prepared from a new biaryl building block are described. The key objective of the study is to tune the size of individual dendritic molecules and investigate its effect on aggregation behavior of the resulting micelle-like assemblies. We show that the functional group placement in the building block influences flexibility of the dendritic backbone and interior volume available for packing the hydrophobic groups, which is reflected in different aggregation behavior and aggregate size of the two types of micellar assemblies.
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Affiliation(s)
- Ashootosh V Ambade
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
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Chen Y, Ambade AV, Vutukuri DR, Thayumanavan S. Self-assembly of facially amphiphilic dendrimers on surfaces. J Am Chem Soc 2007; 128:14760-1. [PMID: 17105258 PMCID: PMC2518940 DOI: 10.1021/ja065625x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Facially amphiphilic dendrimers have been shown to provide significant difference in surface behavior due to subtle changes in structure. The monodendrons are capable of providing hydrophobic surfaces, while the didendrons provide superhydrophobic surfaces. This provides an example of how a molecular level change could result in significant changes in surface behavior. This difference is attributed to the conformational differences exhibited by these dendrimers on surfaces.
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Ambade AV, Chen Y, Thayumanavan S. Controlled functional group presentations in dendrimers as a tool to probe the hyperbranched architecture. NEW J CHEM 2007. [DOI: 10.1039/b617628c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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