1
|
Jalan N, Das T, Sarkar S, Ghosh PP, Ganguly S, Dutta A, Mukhopadhyay M, Goswami S, Bose D. Insights into biomimetic system-ligand interaction of substituted isophthalic acid: A functionality induced photophysical study. Photochem Photobiol 2024. [PMID: 38686675 DOI: 10.1111/php.13955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 02/23/2024] [Accepted: 04/15/2024] [Indexed: 05/02/2024]
Abstract
The present article attempts to interpret the modulation of photophysical properties of isophthalic acid (IPA) through its amino [5-amino isophthalic acid (5-amino IPA)] and azido [5-azido isophthalic acid (5-azido IPA)] substituted derivatives which are chemically potent organic ligands. The ground state structure-reactivity correlation of 5-amino IPA and 5-azido IPA has been deciphered through computational studies. The computed energetics show significant interaction feasibility of the substituted ligand systems with the biomimetic systems which is further validated experimentally. The binding interaction of the probes with oppositely polarized functionalization is studied to be significant with cetyltrimethylammonium bromide (CTAB) and bovine serum albumin (BSA) with the amino functionalized derivative having a comparatively stronger binding constant value. The steady-state absorption and fluorescence study establish significant modification of polarity of the heteronuclear probes. The micro polarity study in water-dioxane mixtures enables determination of polarity of 5-amino IPA in CTAB and BSA unlike 5-azido IPA. Presence of an overlapping region between the emission spectrum of BSA and the absorption spectrum of the probes as probable donor-acceptor pair are also scrutinized via the steady-state fluorescence studies. The photophysical behavior of 5-amino IPA is observed to be somewhat dissimilar to that of 5-azido IPA.
Collapse
Affiliation(s)
- Neha Jalan
- Department of Chemistry, Amity Institute of Applied Sciences, Amity University Kolkata, Kadampukur, India
| | - Tiasha Das
- Department of Chemistry, Amity Institute of Applied Sciences, Amity University Kolkata, Kadampukur, India
| | - Sumit Sarkar
- Department of Materials Science & Technology, School of Applied Science & Technology, Maulana Abul Kalam Azad University of Technology (MAKAUT), Kolkata, India
| | | | - Sumi Ganguly
- Department of Chemistry, Sister Nibedita Govt. General Degree College for Girls, Kolkata, India
| | - Aparna Dutta
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, Kolkata, India
| | - Madhumita Mukhopadhyay
- Department of Materials Science & Technology, School of Applied Science & Technology, Maulana Abul Kalam Azad University of Technology (MAKAUT), Kolkata, India
| | - Soumyabrata Goswami
- Department of Chemistry, Amity Institute of Applied Sciences, Amity University Kolkata, Kadampukur, India
| | - Debosreeta Bose
- Department of Chemistry, Amity Institute of Applied Sciences, Amity University Kolkata, Kadampukur, India
| |
Collapse
|
2
|
Abstract
The global health scenario in present times has raised human awareness about drug delivery strategies. Among colloidal drug delivery vehicles, vesicular nanocarriers such as liposomes and niosomes are popular. However, liposomes and niosomes get disrupted in the harsh environment of the gastrointestinal tract. In this context, the drug delivery community has reported the superior performance of vesicles containing bile salts, that is, bilosomes. The present work attempts to examine the structural/morphological aspects underlying the superior performance of bilosomes. Optical microscopy, electron microscopy, and light scattering give a definite proof of the enhanced stability of bilosomes compared to niosomes, both prepared from the same amphiphilic molecule. Fluorescence probing of the vesicles provides detailed insight into the bilayer characteristics and the differences between bilosomes and niosomes. Fluorescence resonance energy transfer studies lend further support to the findings that bilosomes have a more flexible bilayer structure than niosomes. The entrapment efficiency of the vesicles for the well-known antioxidant curcumin (whose bioavailability is a matter of concern due to low water solubility) was also studied. Bilosomes show higher curcumin entrapment efficiency than niosomes. For use in drug delivery, one needs to establish a trade-off between cargo/drug entrapment and release. Thus, a flexible bilayer structure is an advantage.
Collapse
Affiliation(s)
- Durga Mondal
- Department of Chemistry, University of Kalyani, Kalyani 741235, West Bengal, India
| | - Ranju Prasad Mandal
- Scientist Novel Hair Dyes, Henkel Beauty Care, Henkel AG & Co. KGaA, Henkelstraße 67, 40589 Düsseldorf, Germany
| | - Swati De
- Department of Chemistry, University of Kalyani, Kalyani 741235, West Bengal, India
| |
Collapse
|
3
|
Kotresh MG, Inamdar LS, Shivkumar MA, Adarsh KS, Jagatap BN, Mulimani BG, Advirao GM, Inamdar SR. Interaction and energy transfer studies between bovine serum albumin and CdTe quantum dots conjugates: CdTe QDs as energy acceptor probes. LUMINESCENCE 2016; 32:631-639. [DOI: 10.1002/bio.3231] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 09/06/2016] [Accepted: 09/08/2016] [Indexed: 12/23/2022]
Affiliation(s)
- M. G. Kotresh
- Laser Spectroscopy Programme, Department of Physics and UGC-Centre with Potential for Excellence (CPEPA); Karnatak University; Dharwad India
| | - L. S. Inamdar
- Molecular Endocrinology and Development Laboratory, Department of Zoology, and UGC-CPEPA; Karnatak University; Dharwad India
| | - M. A. Shivkumar
- Laser Spectroscopy Programme, Department of Physics and UGC-Centre with Potential for Excellence (CPEPA); Karnatak University; Dharwad India
| | - K. S. Adarsh
- Laser Spectroscopy Programme, Department of Physics and UGC-Centre with Potential for Excellence (CPEPA); Karnatak University; Dharwad India
| | - B. N. Jagatap
- Chemistry Division; Bhabha Atomic Research Centre; Trombay Mumbai India
| | | | - G. M. Advirao
- Department of Biochemistry; Davangere University; Davangere India
| | - S. R. Inamdar
- Laser Spectroscopy Programme, Department of Physics and UGC-Centre with Potential for Excellence (CPEPA); Karnatak University; Dharwad India
| |
Collapse
|
4
|
Chen F, Yin J, Wang Y, Yang M, Meng Q, Zeng B, Sun D, Liu J. Interaction of L-arginine with κ-casein and its effect on amyloid fibril formation by the protein: Multi-spectroscopic approaches. Journal of Photochemistry and Photobiology B: Biology 2015; 143:130-8. [DOI: 10.1016/j.jphotobiol.2015.01.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/25/2014] [Accepted: 01/06/2015] [Indexed: 01/14/2023]
|
5
|
Hegde AH, Sandhya B, Kalanur SS, Seetharamappa J. Binding Mechanism of Bioactive Cetirizine Hydrochloride to Sudlow’s Site I of Serum Albumins. J SOLUTION CHEM 2011. [DOI: 10.1007/s10953-010-9640-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
6
|
Qaiser D, Khan MS, Singh RD, Khan ZH, Chawla S. Förster's resonance energy transfer between Fullerene C60 and Coumarin C440. Spectrochim Acta A Mol Biomol Spectrosc 2010; 77:1065-1068. [PMID: 20869302 DOI: 10.1016/j.saa.2010.08.074] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Revised: 08/09/2010] [Accepted: 08/26/2010] [Indexed: 05/29/2023]
Abstract
The interaction between Coumarin C440 with Fullerene C60 has been studied by fluorescence and time resolved spectroscopic techniques. The Coumarin C440-Fullerene C60 pair shows Forster's resonance energy transfer (FRET) from Coumarin C440 (donor) to Fullerenes C60 (acceptor). The FRET efficiency of this pair increases with the increase of the acceptor concentration. The critical energy transfer distance (R0) at which transfer efficiency is 50% is found to be 34Ǻ. Stern-Volmer plot indicates static as well as dynamic quenching. However, the FRET studies show highest efficiency at the critical stage of dimer formation.
Collapse
Affiliation(s)
- Darakhshan Qaiser
- Department of Physics, Jamia Millia Islamia, New Delhi 110025, India.
| | | | | | | | | |
Collapse
|
7
|
Bardhan M, Chowdhury J, Ganguly T. Investigations on the interactions of aurintricarboxylic acid with bovine serum albumin: Steady state/time resolved spectroscopic and docking studies. J Photochem Photobiol B 2011; 102:11-9. [PMID: 20863713 DOI: 10.1016/j.jphotobiol.2010.08.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 07/26/2010] [Accepted: 08/30/2010] [Indexed: 11/21/2022]
Abstract
In this paper, the nature of the interactions between bovine serum albumin (BSA) and aurintricarboxylic acid (ATA) has been investigated by measuring steady state and time-resolved fluorescence, circular dichroism (CD), FT-IR and fluorescence anisotropy in protein environment under physiological conditions. From the analysis of the steady state and time-resolved fluorescence quenching of BSA in aqueous solution in presence of ATA it has been inferred that the nature of the quenching originates from the combined effect of static and dynamic modes. From the determination of the thermodynamic parameters obtained from temperature-dependent changes in K(b) (binding constant) it was apparent that the combined effect of hydrophobic association and electrostatic attraction is responsible for the interaction of ATA with BSA. The effect of ATA on the conformation of BSA has been examined by analyzing CD spectrum. Though the observed results demonstrate some conformational changes in BSA in presence of ATA but the secondary structure of BSA, predominantly of α-helix, is found to retain its identity. Molecular docking of ATA with BSA also indicates that ATA docks through hydrophobic interaction.
Collapse
|
8
|
Sarkar D, Mahata A, Das P, Girigoswami A, Ghosh D, Chattopadhyay N. Deciphering the perturbation of serum albumins by a ketocyanine dye: A spectroscopic approach. Journal of Photochemistry and Photobiology B: Biology 2009; 96:136-43. [DOI: 10.1016/j.jphotobiol.2009.05.002] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Revised: 04/18/2009] [Accepted: 05/13/2009] [Indexed: 11/27/2022]
|
9
|
Seth D, Chakraborty A, Setua P, Chakrabarty D, Sarkar N. Study of Energy Transfer from 7-Amino Coumarin Donors to the Rhodamine 6G Acceptor in Lecithin Vesicles and Sodium Taurocholate−Lecithin Mixed Aggregates. J Phys Chem B 2005; 109:12080-5. [PMID: 16852490 DOI: 10.1021/jp050812n] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The energy transfer using 7-amino coumarin dyes as the donor and rhodamine 590 (Rh6G) as the acceptor was investigated in lecithin vesicles and sodium taurocholate (NaTC)-lecithin mixed aggregates using steady-state and time-resolved fluorescence spectroscopy. All energy transfer parameters were calculated. The coumarin 153-Rh6G pair is the most efficient donor-acceptor pair as reflected by the value of k(ET). With addition of NaTC in lecithin, in the case of the coumarin 153-Rh6G pair, the energy transfer rate or efficiency does not change very much, whereas in the case of the coumarin 151-Rh6G pair, the energy transfer rate decreases 2-fold upon going from lecithin vesicles to NaTC-lecithin mixed aggregates where the molar ratio is 2.5. It is mainly due to the deeper location of coumarin 153 in the lipid bilayer or in mixed aggregates. Rotational relaxation data also support this idea.
Collapse
Affiliation(s)
- Debabrata Seth
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, WB, India
| | | | | | | | | |
Collapse
|
10
|
Seth D, Chakrabarty D, Chakraborty A, Sarkar N. Study of energy transfer from 7-amino coumarin donors to rhodamine 6G acceptor in non-aqueous reverse micelles. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2004.11.119] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
11
|
De S, Girigoswami A. Fluorescence resonance energy transfer—a spectroscopic probe for organized surfactant media. J Colloid Interface Sci 2004; 271:485-95. [PMID: 14972626 DOI: 10.1016/j.jcis.2003.10.021] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2003] [Accepted: 10/22/2003] [Indexed: 11/21/2022]
Abstract
Dyes commonly used as biological labels have been used to probe resonance energy transfer in organized media. In neat water, energy transfer between the dye pairs fluorescein (donor):Nile red (acceptor) and acridine orange (donor):Nile red (acceptor) has a very low probability of occurrence. This study shows that the rate constant of energy transfer increases by more than an order of magnitude in organized surfactant media, viz., micelles and reverse micelles of the surfactant Triton X-100. The reverse micelles provide a better medium for energy transfer than the micelles. The energy transfer studies also provide an idea about the location and proximity of donor and acceptor dyes within the various organized media. Assuming Poissonian statistics for dye distribution, the donor-acceptor distances within micelles and reverse micelles are determined from energy transfer parameters. Acridine orange has been found to function better as a donor than fluorescein. This may be due to steric and electrostatic factors.
Collapse
Affiliation(s)
- Swati De
- Department of Chemistry, University of Kalyani, Kalyani, Nadia, 741235 West Bengal, India.
| | | |
Collapse
|
12
|
Pan H, Raza AS, Smith DL. Equilibrium and Kinetic Folding of Rabbit Muscle Triosephosphate Isomerase by Hydrogen Exchange Mass Spectrometry. J Mol Biol 2004; 336:1251-63. [PMID: 15037083 DOI: 10.1016/j.jmb.2003.12.076] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2003] [Revised: 12/21/2003] [Accepted: 12/22/2003] [Indexed: 11/26/2022]
Abstract
Unfolding and refolding of rabbit muscle triosephosphate isomerase (TIM), a model for (betaalpha)8-barrel proteins, has been studied by amide hydrogen exchange/mass spectrometry. Unfolding was studied by destabilizing the protein in guanidine hydrochloride (GdHCl) or urea, pulse-labeling with 2H2O and analyzing the intact protein by HPLC electrospray ionization mass spectrometry. Bimodal isotope patterns were found in the mass spectra of the labeled protein, indicating two-state unfolding behavior. Refolding experiments were performed by diluting solutions of TIM unfolded in GdHCl or urea and pulse-labeling with 2H2O at different times. Mass spectra of the intact protein labeled after one to two minutes had three envelopes of isotope peaks, indicating population of an intermediate. Kinetic modeling indicates that the stability of the folding intermediate in water is only 1.5 kcal/mol. Failure to detect the intermediate in the unfolding experiments was attributed to its low stability and the high concentrations of denaturant required for unfolding experiments. The folding status of each segment of the polypeptide backbone was determined from the deuterium levels found in peptic fragments of the labeled protein. Analysis of these spectra showed that the C-terminal half folds to form the intermediate, which then forms native TIM with folding of the N-terminal half. These results show that TIM folding fits the (4+4) model for folding of (betaalpha)8-barrel proteins. Results of a double-jump experiment indicate that proline isomerization does not contribute to the rate-limiting step in the folding of TIM.
Collapse
Affiliation(s)
- Hai Pan
- Department of Chemistry, Nebraska Center for Mass Spectrometry, University of Nebraska-Lincoln, 29 Hamilton Hall, Lincoln, NE 68588-0304, USA
| | | | | |
Collapse
|
13
|
Krishna SH, Srinivas ND, Raghavarao KSMS, Karanth NG. Reverse micellar extraction for downstream processing of proteins/enzymes. Adv Biochem Eng Biotechnol 2002; 75:119-83. [PMID: 11787493 DOI: 10.1007/3-540-44604-4_5] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
New developments in the area of downstream processing are, hopefully, to fulfill the promises of modern biotechnology. The traditional separation processes such as chromatography or electrophoresis can become prohibitively expensive unless the product is of high value. Hence, there is a need to develop efficient and cost-effective downstream processing methods. Reverse micellar extraction is one such potential and a promising liquid-liquid extraction technique, which has received immense attention for isolation and purification of proteins/enzymes in the recent times. This technique is easy to scale-up and offers continuous operation. This review, besides briefly considering important physico-chemical and biological aspects, highlights the engineering aspects including mass transfer, mathematical modeling, and technology development. It also discusses recent developments in reverse micellar extraction such as affinity based separations, enzymatic reactions in reverse micelles coupled with membrane processes, reverse micellar extraction in hollow fibers, etc. Special emphasis has been given to some recent applications of this technique.
Collapse
Affiliation(s)
- S Hari Krishna
- Department of Fermentation Technology & Bioengineering, Central Food Technological Research Institute, Mysore, India.
| | | | | | | |
Collapse
|
14
|
Abstract
BACKGROUND The limited proteolytic cleavage of proteins can result in distinct polypeptides that remain noncovalently associated so that the structural and biochemical properties of the 'nicked' protein are virtually indistinguishable from those of the native protein. The remarkable observation that rabbit muscle triosephosphate isomerase (TIM) can be multiply nicked by subtilisin and efficiently religated in the presence of an organic solvent formed the stimulus for our study on a homologous system, Plasmodium falciparum triosephosphate isomerase (PfTIM). RESULTS The subtilisin nicked form of PfTIM was prepared by limited proteolysis using subtilisin and the major fragments identified using electrospray ionization mass spectrometry. The order of susceptibility of the peptide bonds in the protein was also determined. The structure of the nicked form of TIM was investigated using circular dichroism, fluorescence and gel filtration. The nicked enzyme exhibited remarkable stability to denaturants, although significant differences were observed with the wild-type enzyme. Efficient religation could be achieved by addition of an organic cosolvent, such as acetonitrile, in the presence of subtilisin. Religation was also demonstrated after dissociation of the proteolytic fragments in guanidinium chloride, followed by reassembly after removal of the denaturant. CONCLUSIONS The eight-stranded beta8/alpha8 barrel is a robust, widely used protein structural motif. This study demonstrates that the TIM barrel can withstand several nicks in the polypeptide backbone with a limited effect on its structure and stability.
Collapse
Affiliation(s)
- S S Ray
- Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India
| | | | | |
Collapse
|
15
|
Abstract
Water is fundamental for enzyme action and for formation of the three-dimensional structure of proteins. Hence, it may be assumed that studies on the interplay between water and enzymes can yield insight into enzyme function and formation. This has proven correct, because the numerous studies that have been made on the behavior of water-soluble and membrane enzymes in systems with a low water content (reverse micelles or enzymes suspended in nonpolar organic solvents) have revealed properties of enzymes that are not easily appreciated in aqueous solutions. In the low water systems, it has been possible to probe the relation between solvent and enzyme kinetics, as well as some of the factors that affect enzyme thermostability and catalysis. Furthermore, the studies show that low water environments can be used to stabilize conformers that exhibit unsuspected catalytic properties, as well as intermediates of enzyme function and formation that in aqueous media have relatively short life-times. The structure of enzymes in these unnatural conditions is actively being explored.
Collapse
|
16
|
Abstract
Recent studies have implicated the amyloid Abeta peptide and its ability to self-assemble as key factors in the pathogenesis of Alzheimer's disease. Relatively little is known about the structure of soluble Abeta or its oligomeric state, and the existing data are often contradictory. In this study, we used intrinsic fluorescence of wild type Abeta-(1-40), fluorescence resonance energy transfer (FRET), and gel filtration chromatography to examine the structure of Abeta-(1-40) in solution. We synthesized a series of mono-substituted fluorescent Abeta-(1-40) derivatives to use as donors and acceptors in FRET experiments. We selected fluorescent peptides that exhibit aggregation properties comparable to wild type Abeta for analysis in donor-acceptor pairs; two labeled with 5-(2-((iodoacetyl)amino)ethyl)aminonaphthylene-1-sulfonic acid at Cys-25 or Cys-34 and fluorescein maleimide at Cys-4 or Cys-7. Another peptide containing a Trp substitution at position 10 was used as an acceptor for the intrinsic Tyr fluorescence of wild type Abeta-(1-40). Equilibrium studies of the denaturation of Abeta-(1-40) by increasing concentrations of dimethyl sulfoxide (Me2SO) were conducted by monitoring fluorescence, with a midpoint value for the unfolding transition of both the substituted and wild type peptides at among 40 and 50% Me2SO. Abeta-(1-40) is well solvated and largely monomeric in Me2SO as evidenced by a lack of FRET. When donor and acceptor Abeta derivatives are mixed together in Me2SO and then diluted 10-fold into aqueous Tris-HCl buffer at pH 7.4, efficient FRET is observed immediately for all pairs of fluorescent peptides, indicating that donor-acceptor dimers exist in solution. FRET is abolished by the addition of an excess of unlabeled Abeta-(1-40), demonstrating that the fluorescent peptides interact with wild type Abeta-(1-40) to form heterodimers that do not exhibit FRET. The Abeta-(1-40) dimers appear to be very stable, because no subunit exchange is observed after 24 h between fluorescent homodimers. Gel filtration confirms that nanomolar concentrations of 14C-labeled Abeta-(1-40) and fluorescein-labeled Abeta-(1-40) elute at the same dimeric position as wild type Abeta-(1-40), suggesting that soluble Abeta-(1-40) is also dimeric at more physiologically plausible concentrations.
Collapse
Affiliation(s)
- W Garzon-Rodriguez
- Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92696, USA
| | | | | | | |
Collapse
|