1
|
Kinali H, Kalaycioglu GD, Boyacioglu O, Korkusuz P, Aydogan N, Vargel I. Clinic-oriented injectable smart material for the treatment of diabetic wounds: Coordinating the release of GM-CSF and VEGF. Int J Biol Macromol 2024; 276:133661. [PMID: 38992546 DOI: 10.1016/j.ijbiomac.2024.133661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Revised: 06/16/2024] [Accepted: 07/02/2024] [Indexed: 07/13/2024]
Abstract
Chronic wounds are often caused by diabetes and present a challenging clinical problem due to vascular problems leading to ischemia. This inhibits proper wound healing by delaying inflammatory responses and angiogenesis. To address this problem, we have developed injectable particle-loaded hydrogels which sequentially release Granulocyte-macrophage- colony-stimulating-factor (GM-CSF) and Vascular endothelial growth factor (VEGF) encapsulated in polycaprolactone-lecithin-geleol mono-diglyceride hybrid particles. GM-CSF promotes inflammation, while VEGF facilitates angiogenesis. The hybrid particles (200-1000 nm) designed within the scope of the study can encapsulate the model proteins Bovine Serum Albumin 65 ± 5 % and Lysozyme 77 ± 10 % and can release stably for 21 days. In vivo tests and histological findings revealed that in the hydrogels containing GM-CSF/VEGF-loaded hybrid particles, wound depth decreased, inflammation phase increased, and fibrotic scar tissue decreased, while mature granulation tissue was formed on day 10. These findings confirm that the hybrid particles first initiate the inflammation phase by delivering GM-CSF, followed by VEGF, increasing the number of vascularization and thus increasing the healing rate of wounds. We emphasize the importance of multi-component and sequential release in wound healing and propose a unifying therapeutic strategy to sequentially deliver ligands targeting wound healing stages, which is very important in the treatment of the diabetic wounds.
Collapse
Affiliation(s)
- Hurmet Kinali
- Department of Bioengineering, Graduate School of Science and Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Gokce Dicle Kalaycioglu
- Department of Chemical Engineering, Faculty of Engineering, Hacettepe University, Ankara 06800, Turkey
| | - Ozge Boyacioglu
- Department of Bioengineering, Graduate School of Science and Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey; Department of Medical Biochemistry, Faculty of Medicine, Atılım University, 06830 Gölbaşı, Ankara, Turkey
| | - Petek Korkusuz
- Department of Histology and Embryology, Faculty of Medicine, Hacettepe University, 06100 Sıhhiye, Ankara, Turkey
| | - Nihal Aydogan
- Department of Bioengineering, Graduate School of Science and Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey; Department of Chemical Engineering, Faculty of Engineering, Hacettepe University, Ankara 06800, Turkey.
| | - Ibrahim Vargel
- Department of Bioengineering, Graduate School of Science and Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey; Department of Plastic and Reconstructive Surgery, Faculty of Medicine, Hacettepe University, 06560 Ankara, Turkey.
| |
Collapse
|
2
|
Zhou K, Tang M, Zhang W, Chen Y, Guan Y, Huang R, Duan J, Liu Z, Ji X, Jiang Y, Hu Y, Zhang X, Zhou J, Chen M. Exposure to Molybdate Results in Metabolic Disorder: An Integrated Study of the Urine Elementome and Serum Metabolome in Mice. TOXICS 2024; 12:288. [PMID: 38668511 PMCID: PMC11053804 DOI: 10.3390/toxics12040288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 04/04/2024] [Accepted: 04/12/2024] [Indexed: 04/29/2024]
Abstract
The increasing use of molybdate has raised concerns about its potential toxicity in humans. However, the potential toxicity of molybdate under the current level of human exposure remains largely unknown. Endogenous metabolic alterations that are caused in humans by environmental exposure to pollutants are associated with the occurrence and progression of many diseases. This study exposed eight-week-old male C57 mice to sodium molybdate at doses relevant to humans (0.01 and 1 mg/kg/day) for eight weeks. Inductively coupled plasma mass spectrometry (ICP-MS) and ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS) were utilized to assess changes in urine element levels and serum metabolites in mice, respectively. A total of 838 subjects from the NHANES 2017-2018 population database were also included in our study to verify the associations between molybdenum and cadmium found in mice. Analysis of the metabolome in mice revealed that four metabolites in blood serum exhibited significant changes, including 5-aminolevulinic acid, glycolic acid, l-acetylcarnitine, and 2,3-dihydroxypropyl octanoate. Analysis of the elementome revealed a significant increase in urine levels of cadmium after molybdate exposure in mice. Notably, molybdenum also showed a positive correlation with cadmium in humans from the NHANES database. Further analysis identified a positive correlation between cadmium and 2,3-dihydroxypropyl octanoate in mice. In conclusion, these findings suggest that molybdate exposure disrupted amino acid and lipid metabolism, which may be partially mediated by molybdate-altered cadmium levels. The integration of elementome and metabolome data provides sensitive information on molybdate-induced metabolic disorders and associated toxicities at levels relevant to human exposure.
Collapse
Affiliation(s)
- Kun Zhou
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Miaomiao Tang
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Wei Zhang
- Sir Run Run Hospital of Nanjing Medical University, Nanjing 211166, China; (W.Z.); (Y.H.)
| | - Yanling Chen
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Yusheng Guan
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Rui Huang
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Jiawei Duan
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Zibo Liu
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Xiaoming Ji
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Yingtong Jiang
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Yanhui Hu
- Sir Run Run Hospital of Nanjing Medical University, Nanjing 211166, China; (W.Z.); (Y.H.)
| | - Xiaoling Zhang
- Department of Hygienic Analysis and Detection, Nanjing Medical University, Nanjing 211166, China;
| | - Jingjing Zhou
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| | - Minjian Chen
- State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China; (K.Z.); (M.T.); (Y.C.); (Y.G.); (R.H.); (J.D.); (Z.L.); (X.J.); (Y.J.); (J.Z.)
- Key Laboratory of Modern Toxicology of Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing 211166, China
| |
Collapse
|
3
|
Gooran N, Kopra K. Fluorescence-Based Protein Stability Monitoring-A Review. Int J Mol Sci 2024; 25:1764. [PMID: 38339045 PMCID: PMC10855643 DOI: 10.3390/ijms25031764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 01/26/2024] [Accepted: 01/29/2024] [Indexed: 02/12/2024] Open
Abstract
Proteins are large biomolecules with a specific structure that is composed of one or more long amino acid chains. Correct protein structures are directly linked to their correct function, and many environmental factors can have either positive or negative effects on this structure. Thus, there is a clear need for methods enabling the study of proteins, their correct folding, and components affecting protein stability. There is a significant number of label-free methods to study protein stability. In this review, we provide a general overview of these methods, but the main focus is on fluorescence-based low-instrument and -expertise-demand techniques. Different aspects related to thermal shift assays (TSAs), also called differential scanning fluorimetry (DSF) or ThermoFluor, are introduced and compared to isothermal chemical denaturation (ICD). Finally, we discuss the challenges and comparative aspects related to these methods, as well as future opportunities and assay development directions.
Collapse
Affiliation(s)
| | - Kari Kopra
- Department of Chemistry, University of Turku, Henrikinkatu 2, 20500 Turku, Finland;
| |
Collapse
|
4
|
Swamy MJ, Mondal S. Subunit association, and thermal and chemical unfolding of Cucurbitaceae phloem exudate lectins. A review. Int J Biol Macromol 2023; 233:123434. [PMID: 36709810 DOI: 10.1016/j.ijbiomac.2023.123434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 01/13/2023] [Accepted: 01/22/2023] [Indexed: 01/27/2023]
Abstract
Detailed characterization of protein (un)folding intermediates is crucial for understanding the (un)folding pathway, aggregation, stability and their functional properties. In recent years, stress-inducible lectins are being investigated with much interest. In plants phloem proteins PP1 and PP2 are major components of the phloem fluid. While PP1 is a structural protein, PP2 exhibits lectin activity, and was proposed to play key roles in wound sealing, anti-pathogenic activity, and transportation of various molecules including RNA within the plant. Cucurbitaceae fruits contain high concentrations of PP2 lectins, which recognize chitooligosaccharides with high specificity. Although the presence of PP2 lectins in the phloem exudate of Cucurbitaceae species was documented over 40 years ago, so far only a few proteins from this family have been purified and characterized in detail. This review summarizes the results of biophysical studies aimed at investigating the oligomeric status of these lectins, their thermal stability, structural perturbations caused by changes in pH and addition of chaotropic agents and characterization of intermediates observed in the unfolding process. The implications of these results in the functional roles played by PP2 type lectins in their native environment are discussed. Finally, perspectives for future biophysical research on these proteins are given.
Collapse
Affiliation(s)
- Musti J Swamy
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India.
| | - Saradamoni Mondal
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| |
Collapse
|
5
|
Recent progress in drying technologies for improving the stability and delivery efficiency of biopharmaceuticals. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2023; 53:35-57. [PMID: 36568503 PMCID: PMC9768793 DOI: 10.1007/s40005-022-00610-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 12/12/2022] [Indexed: 12/24/2022]
Abstract
Background Most biopharmaceuticals are developed in liquid dosage forms that are less stable than solid forms. To ensure the stability of biopharmaceuticals, it is critical to use an effective drying technique in the presence of an appropriate stabilizing excipient. Various drying techniques are available for this purpose, such as freeze drying or lyophilization, spray drying, spray freeze-drying, supercritical fluid drying, particle replication in nonwetting templates, and fluidized bed drying. Area covered In this review, we discuss drying technologies and their applications in the production of stable solid-state biopharmaceuticals, providing examples of commercially available products or clinical trial formulations. Alongside this, we also review how different analytical methods may be utilized in the evaluation of aerosol performance and powder characteristics of dried protein powders. Finally, we assess the protein integrity in terms of conformational and physicochemical stability and biological activity. Expert opinion With the aim of treating either infectious respiratory diseases or systemic disorders, inhaled biopharmaceuticals reduce both therapeutic dose and cost of therapy. Drying methods in the presence of optimized protein/stabilizer combinations, produce solid dosage forms of proteins with greater stability. A suitable drying method was chosen, and the process parameters were optimized based on the route of protein administration. With the ongoing trend of addressing deficiencies in biopharmaceutical production, developing new methods to replace conventional drying methods, and investigating novel excipients for more efficient stabilizing effects, these products have the potential to dominate the pharmaceutical industry in the future.
Collapse
|
6
|
Liu JY, Sayes CM. Lung surfactant as a biophysical assay for inhalation toxicology. Curr Res Toxicol 2022; 4:100101. [PMID: 36687216 PMCID: PMC9849875 DOI: 10.1016/j.crtox.2022.100101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 11/21/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022] Open
Abstract
Lung surfactant (LS) is a mixture of lipids and proteins that forms a thin film at the gas-exchange surfaces of the alveoli. The components and ultrastructure of LS contribute to its biophysical and biochemical functions in the respiratory system, most notably the lowering of surface tension to facilitate breathing mechanics. LS inhibition can be caused by metabolic deficiencies or the intrusion of endogenous or exogenous substances. While LS has been sourced from animals or synthesized for clinical therapeutics, the biofluid mixture has also gained recent interest as a biophysical model for inhalation toxicity. Various methods can be used to evaluate LS function quantitatively or qualitatively after exposure to potential toxicants. A narrative review of the recent literature was conducted. Studies focused whether LS was inhibited by various environmental contaminants, nanoparticles, or manufactured products. A review is also conducted on synthetic lung surfactants (SLS), which have emerged as a promising alternative to conventional animal-sourced LS. The intrinsic advantages and recent advances of SLS make a strong case for more widespread usage in LS-based toxicological assays.
Collapse
Affiliation(s)
| | - Christie M. Sayes
- Corresponding author at: Baylor University, Department of Environmental Science, One Bear Place # 97266, Waco, TX 76798-7266.
| |
Collapse
|
7
|
Liu Y, Huang Y, Wang Y, Zhong J, Li S, Zhu B, Dong X. Application of cod protein-stabilized and casein-stabilized high internal phase emulsions as novel fat substitutes in fish cake. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.114267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
8
|
Berry SC, Triplett OA, Yu LR, Hart ME, Jackson LS, Tolleson WH. Microcalorimetric Investigations of Reversible Staphylococcal Enterotoxin Unfolding. Toxins (Basel) 2022; 14:toxins14080554. [PMID: 36006217 PMCID: PMC9414061 DOI: 10.3390/toxins14080554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 07/27/2022] [Accepted: 08/04/2022] [Indexed: 11/24/2022] Open
Abstract
Staphylococcal food poisoning (SFP) is a common food-borne illness often associated with contamination during food handling. The genes for Staphylococcal enterotoxin (SE) isoforms SEA and SEB are frequently detected in human nasal Staphylococcus aureus isolates and these toxins are commonly associated with SFP. Past studies described the resistance of preformed SE proteins to heat inactivation and their reactivation upon cooling in foods. Full thermodynamic analyses for these processes have not been reported, however. The thermal stabilities of SEA, SEB, and SEH and reversibility of unfolding in simple buffers were investigated at pH 4.5 and pH 6.8 using differential scanning calorimetry (DSC). SEA and SEB unfolding was irreversible at pH 6.8 and at least partially reversible at pH 4.5 while SEH unfolding was irreversible at pH 4.5 and reversible at pH 6.8. Additional studies showed maximum refolding for SEB at pH 3.5–4.0 and diminished refolding at pH 4.5 with increasing ionic strength. SE-stimulated secretion of interferon-gamma by human peripheral blood mononuclear cells was used to assess residual SE biological activity following heat treatments using conditions matching those used for DSC studies. The biological activities of SEB and SEH exhibited greater resistance to heat inactivation than that of SEA. The residual activities of heat-treated SEB and SEH were measurable but diminished further in the presence of reconstituted nonfat dry milk adjusted to pH 4.5 or pH 6.8. To different extents, the pH and ionic strengths typical for foods influenced the thermal stabilities of SEA, SEB, and SEH and their potentials to renature spontaneously after heat treatments.
Collapse
Affiliation(s)
- Susan C. Berry
- National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
| | - Odbert A. Triplett
- National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
| | - Li-Rong Yu
- National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
| | - Mark E. Hart
- National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
| | - Lauren S. Jackson
- Division of Food Processing Science & Technology, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, 6502 S. Archer Rd., Bedford Park, IL 60501, USA
| | - William H. Tolleson
- National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
- Correspondence: or ; Tel.: +1870-543-7645
| |
Collapse
|
9
|
Shafaa MW, Hassan ESE, Faraag AHI, Essawy E, Abdelfattah MS. Fabrication and characterization of pigmented secondary metabolites bound liposomes with improved cytotoxic activity against prostate and hepatic cancer. INTERNATIONAL NANO LETTERS 2022. [DOI: 10.1007/s40089-022-00375-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
Laity PR, Holland C. Seeking Solvation: Exploring the Role of Protein Hydration in Silk Gelation. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020551. [PMID: 35056868 PMCID: PMC8781151 DOI: 10.3390/molecules27020551] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 12/31/2021] [Accepted: 01/11/2022] [Indexed: 02/05/2023]
Abstract
The mechanism by which arthropods (e.g., spiders and many insects) can produce silk fibres from an aqueous protein (fibroin) solution has remained elusive, despite much scientific investigation. In this work, we used several techniques to explore the role of a hydration shell bound to the fibroin in native silk feedstock (NSF) from Bombyx mori silkworms. Small angle X-ray and dynamic light scattering (SAXS and DLS) revealed a coil size (radius of gyration or hydrodynamic radius) around 12 nm, providing considerable scope for hydration. Aggregation in dilute aqueous solution was observed above 65 °C, matching the gelation temperature of more concentrated solutions and suggesting that the strength of interaction with the solvent (i.e., water) was the dominant factor. Infrared (IR) spectroscopy indicated decreasing hydration as the temperature was raised, with similar changes in hydration following gelation by freezing or heating. It was found that the solubility of fibroin in water or aqueous salt solutions could be described well by a relatively simple thermodynamic model for the stability of the protein hydration shell, which suggests that the affected water is enthalpically favoured but entropically penalised, due to its reduced (vibrational or translational) dynamics. Moreover, while the majority of this investigation used fibroin from B. mori, comparisons with published work on silk proteins from other silkworms and spiders, globular proteins and peptide model systems suggest that our findings may be of much wider significance.
Collapse
|
11
|
Mahrous GR, Elkholy NS, Safwat G, Shafaa MW. Enhanced cytotoxic activity of beta carotene conjugated liposomes towards breast cancer cell line: comparative studies with cyclophosphamide. Anticancer Drugs 2022; 33:e462-e476. [PMID: 34726638 DOI: 10.1097/cad.0000000000001245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This work aims to evaluate cyclophosphamide (Cyclo) cytotoxic efficacy combined with liposomes in the presence or absence of beta carotene (beta) by detecting the effects of these compounds on the breast cancer cell line (MCF-7) DNA damage. The IC50 value for beta in cytotoxic assay with MCF-7 treated cells was 21.15 μg/ml, while with liposomal beta (LipoBeta) being 121 μg/ml. The free Cyclo IC50 value was 719.86 μg/ml, its liposomal form (LipoCyclo) was 172 μg/ml. The results indicated that in contrast with Cyclo and control values, all comet assay parameters for the LipoBeta were significantly increased (P < 0.05). In MCF-7 cells treated with beta, the findings show a higher intensity of comet tail than those treated with LipoBeta. The presence of several double-strand breaks suggests this high intensity relative to the head. The molecular combination between Cyclo and liposomes in the presence or absence of beta was characterized. Dynamic light scattering measurements confirmed the mono-dispersity of all samples. The incorporation of Cyclo or beta into liposomes exhibited a slight shift to higher temperature compared to the main peak of empty liposomes that exists at 101.5°C which creates a conformational disorder within the phospholipids. The FTIR study showed structural alterations in vesicles after liposome encapsulation.
Collapse
Affiliation(s)
- Gina R Mahrous
- Faculty of Biotechnology, October University for Modern Science and Arts, Cairo, Egypt
| | - Nourhan S Elkholy
- Medical Biophysics Division, Physics Department, Faculty of Science, Helwan University, Cairo, Egypt
| | - Gehan Safwat
- Faculty of Biotechnology, October University for Modern Science and Arts, Cairo, Egypt
| | - Medhat W Shafaa
- Medical Biophysics Division, Physics Department, Faculty of Science, Helwan University, Cairo, Egypt
| |
Collapse
|
12
|
Biophysical Characterization of Viral and Lipid-Based Vectors for Vaccines and Therapeutics with Light Scattering and Calorimetric Techniques. Vaccines (Basel) 2021; 10:vaccines10010049. [PMID: 35062710 PMCID: PMC8780473 DOI: 10.3390/vaccines10010049] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 12/27/2021] [Accepted: 12/29/2021] [Indexed: 01/01/2023] Open
Abstract
Novel vaccine platforms for delivery of nucleic acids based on viral and non-viral vectors, such as recombinant adeno associated viruses (rAAV) and lipid-based nanoparticles (LNPs), hold great promise. However, they pose significant manufacturing and analytical challenges due to their intrinsic structural complexity. During product development and process control, their design, characterization, and quality control require the combination of fit-for-purpose complementary analytical tools. Moreover, an in-depth methodological expertise and holistic approach to data analysis are required for robust measurements and to enable an adequate interpretation of experimental findings. Here the combination of complementary label-free biophysical techniques, including dynamic light scattering (DLS), multiangle-DLS (MADLS), Electrophoretic Light Scattering (ELS), nanoparticle tracking analysis (NTA), multiple detection SEC and differential scanning calorimetry (DSC), have been successfully used for the characterization of physical and chemical attributes of rAAV and LNPs encapsulating mRNA. Methods' performance, applicability, dynamic range of detection and method optimization are discussed for the measurements of multiple critical physical-chemical quality attributes, including particle size distribution, aggregation propensity, polydispersity, particle concentration, particle structural properties and nucleic acid payload.
Collapse
|
13
|
da S. Pereira A, Souza CPL, Moraes L, Fontes-Sant’Ana GC, Amaral PFF. Polymers as Encapsulating Agents and Delivery Vehicles of Enzymes. Polymers (Basel) 2021; 13:polym13234061. [PMID: 34883565 PMCID: PMC8659040 DOI: 10.3390/polym13234061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/12/2021] [Accepted: 11/13/2021] [Indexed: 01/15/2023] Open
Abstract
Enzymes are versatile biomolecules with broad applications. Since they are biological molecules, they can be easily destabilized when placed in adverse environmental conditions, such as variations in temperature, pH, or ionic strength. In this sense, the use of protective structures, as polymeric capsules, has been an excellent approach to maintain the catalytic stability of enzymes during their application. Thus, in this review, we report the use of polymeric materials as enzyme encapsulation agents, recent technological developments related to this subject, and characterization methodologies and possible applications of the formed bioactive structures. Our search detected that the most explored methods for enzyme encapsulation are ionotropic gelation, spray drying, freeze-drying, nanoprecipitation, and electrospinning. α-chymotrypsin, lysozyme, and β-galactosidase were the most used enzymes in encapsulations, with chitosan and sodium alginate being the main polymers. Furthermore, most studies reported high encapsulation efficiency, enzyme activity maintenance, and stability improvement at pH, temperature, and storage. Therefore, the information presented here shows a direction for the development of encapsulation systems capable of stabilizing different enzymes and obtaining better performance during application.
Collapse
Affiliation(s)
- Adejanildo da S. Pereira
- Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-909, Brazil; (A.d.S.P.); (C.P.L.S.); (L.M.)
| | - Camila P. L. Souza
- Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-909, Brazil; (A.d.S.P.); (C.P.L.S.); (L.M.)
| | - Lidiane Moraes
- Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-909, Brazil; (A.d.S.P.); (C.P.L.S.); (L.M.)
| | - Gizele C. Fontes-Sant’Ana
- Biochemical Processes Technology Department, Chemistry Institute, Universidade do Estado do Rio de Janeiro, Rio de Janeiro 20550-013, Brazil;
| | - Priscilla F. F. Amaral
- Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-909, Brazil; (A.d.S.P.); (C.P.L.S.); (L.M.)
- Correspondence: ; Tel.: +55-21-3938-7623
| |
Collapse
|
14
|
Politou AS, Pastore A, Temussi PA. An "Onion-like" Model of Protein Unfolding: Collective versus Site Specific Approaches. Chemphyschem 2021; 23:e202100520. [PMID: 34549492 DOI: 10.1002/cphc.202100520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 09/09/2021] [Indexed: 11/10/2022]
Abstract
Approximating protein unfolding by an all-or-none cooperative event is a convenient assumption that can provide precious global information on protein stability. It is however quickly emerging that the scenario is far more complex and that global denaturation curves often hide a rich heterogeneity of states that are largely probe dependent. In this review, we revisit the importance of gaining site-specific information on the unfolding process. We focus on nuclear magnetic resonance, as this is the main technique able to provide site-specific information. We review historical and most modern approaches that have allowed an appreciable advancement of the field of protein folding. We also demonstrate how unfolding is a reporter dependent event, suggesting the outmost importance of selecting the reporter carefully.
Collapse
Affiliation(s)
- Anastasia S Politou
- Faculty of Medicine, University of Ioannina.,Institute of Molecular Biology and Biotechnology-FORTH, Ioannina, Greece
| | - Annalisa Pastore
- UK Dementia Research Institute at the, Maurice Wohl Institute of King's College London, 5 Cutcombe Rd, London, SE5 9RT, United Kingdom
| | - Piero Andrea Temussi
- UK Dementia Research Institute at the, Maurice Wohl Institute of King's College London, 5 Cutcombe Rd, London, SE5 9RT, United Kingdom
| |
Collapse
|
15
|
Houser J, Kosourova J, Kubickova M, Wimmerova M. Development of 48-condition buffer screen for protein stability assessment. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2021; 50:461-471. [PMID: 33554291 DOI: 10.1007/s00249-021-01497-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 12/22/2020] [Accepted: 01/07/2021] [Indexed: 10/22/2022]
Abstract
The determination of a suitable buffer environment for a protein of interest is not an easy task. The requirements of advanced techniques, the demands on the biological material and the researcher time needed for buffer optimization, as well as personal inflexibility, lead frequently to the use of sub-optimal buffers. Here, we demonstrate the design of a 48-condition buffer screen that can be used to determine an appropriate environment for downstream studies. By the combination of several techniques (differential scanning fluorimetry, dynamic light scattering, and bio-layer interferometry), we are able to assess the protein stability, homogeneity and binding activity across the screen with less than half a milligram of protein in 1 day. The application of this screen helps to avoid unsuitable conditions, to explain problems observed upon protein analysis and to choose the most suitable buffers for further research. The screen can be routinely used as a primary screen for buffer optimization in labs and facilities.
Collapse
Affiliation(s)
- Josef Houser
- Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic. .,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic.
| | - Jana Kosourova
- Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Monika Kubickova
- Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Michaela Wimmerova
- Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic.,Department of Biochemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| |
Collapse
|
16
|
Caprara D, Ripanti F, Capocefalo A, Ceccarini M, Petrillo C, Postorino P. Exploiting SERS sensitivity to monitor DNA aggregation properties. Int J Biol Macromol 2020; 170:88-93. [PMID: 33358955 DOI: 10.1016/j.ijbiomac.2020.12.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/19/2020] [Accepted: 12/05/2020] [Indexed: 01/11/2023]
Abstract
In the last decades, DNA has been considered far more than the system carrying the essential genetic instructions. Indeed, because of the remarkable properties of the base-pairing specificity and thermoreversibility of the interactions, DNA plays a central role in the design of innovative architectures at the nanoscale. Here, combining complementary DNA strands with a custom-made solution of silver nanoparticles, we realize plasmonic aggregates to exploit the sensitivity of Surface Enhanced Raman Spectroscopy (SERS) for the identification/detection of the distinctive features of DNA hybridization, both in solution and on dried samples. Moreover, SERS allows monitoring the DNA aggregation process by following the temperature variation of a specific spectroscopic marker associated with the Watson-Crick hydrogen bond formation. This temperature-dependent behavior enables us to precisely reconstruct the melting profile of the selected DNA sequences by spectroscopic measurements only.
Collapse
Affiliation(s)
- Debora Caprara
- Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | | | - Angela Capocefalo
- Istituto dei Sistemi Complessi-CNR c/o Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Marina Ceccarini
- National Centre for Rare Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy
| | - Caterina Petrillo
- Physics and Geology Department, University of Perugia, Via A. Pascoli, 06123 Perugia, Italy
| | - Paolo Postorino
- Sapienza University of Rome, P.le Aldo Moro 5, 00185 Rome, Italy
| |
Collapse
|
17
|
Sherifi I, Bachy M, Laumonier T, Petite H, Hannouche D. Use of supercritical carbon dioxide technology for fabricating a tissue engineering scaffold for anterior cruciate ligament repair. Sci Rep 2020; 10:14030. [PMID: 32820218 PMCID: PMC7441384 DOI: 10.1038/s41598-020-70994-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 08/04/2020] [Indexed: 01/05/2023] Open
Abstract
Tissue-engineered grafts may be useful in Anterior Cruciate Ligament (ACL) repair and provide a novel, alternative treatment to clinical complications of rupture, harvest site morbidity and biocompatibility associated with autografts, allografts and synthetic grafts. We successfully used supercritical carbon dioxide (Sc-CO2) technology for manufacturing a “smart” biomaterial scaffold, which retains the native protein conformation and tensile strength of the natural ACL but is decellularized for a decreased immunogenic response. We designed and fabricated a new scaffold exhibiting (1) high tensile strength and biomechanical properties comparable to those of the native tissue, (2) thermodynamically-stable extra-cellular matrix (ECM), (3) preserved collagen composition and crosslinking, (4) a decellularized material milieu with potential for future engineering applications and (5) proven feasibility and biocompatibility in an animal model of ligament reconstruction. Because of the “smart” material ECM, this scaffold may have the potential for providing a niche and for directing stem cell growth, differentiations and function pertinent to new tissue formation. Sc-CO2-related technology is advanced and has the capability to provide scaffolds of high strength and durability, which sustain a lifetime of wear and tear under mechanical loading in vivo.
Collapse
Affiliation(s)
- Ines Sherifi
- Laboratoire de Bioingénierie et Biomécanique Ostéo-Articulaire (B2OA), UMR, CNRS 7052, Paris 7 University, Paris, France.,Division of Cardiology, Department of Medicine, Weill Cornell Medical College, New York Presbyterian Hospital, New York, NY, USA
| | - Manon Bachy
- Laboratoire de Bioingénierie et Biomécanique Ostéo-Articulaire (B2OA), UMR, CNRS 7052, Paris 7 University, Paris, France.,Department of Pediatric Orthopaedic Surgery, AP-HP, Hôpital Trousseau, Paris, France
| | - Thomas Laumonier
- Department of Orthopaedic Surgery, Faculty of Medicine, Geneva University Hospitals, Avenue Gabrielle Perret Gentil 4, 1205, Geneva, Switzerland
| | - Hervé Petite
- Laboratoire de Bioingénierie et Biomécanique Ostéo-Articulaire (B2OA), UMR, CNRS 7052, Paris 7 University, Paris, France
| | - Didier Hannouche
- Laboratoire de Bioingénierie et Biomécanique Ostéo-Articulaire (B2OA), UMR, CNRS 7052, Paris 7 University, Paris, France. .,Department of Orthopaedic Surgery, Faculty of Medicine, Geneva University Hospitals, Avenue Gabrielle Perret Gentil 4, 1205, Geneva, Switzerland.
| |
Collapse
|
18
|
Pricolo MR, Herrero-Galán E, Mazzaccara C, Losi MA, Alegre-Cebollada J, Frisso G. Protein Thermodynamic Destabilization in the Assessment of Pathogenicity of a Variant of Uncertain Significance in Cardiac Myosin Binding Protein C. J Cardiovasc Transl Res 2020; 13:867-877. [PMID: 32034629 DOI: 10.1007/s12265-020-09959-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 01/20/2020] [Indexed: 12/29/2022]
Abstract
In the era of next generation sequencing (NGS), genetic testing for inherited disorders identifies an ever-increasing number of variants whose pathogenicity remains unclear. These variants of uncertain significance (VUS) limit the reach of genetic testing in clinical practice. The VUS for hypertrophic cardiomyopathy (HCM), the most common familial heart disease, constitute over 60% of entries for missense variants shown in ClinVar database. We have studied a novel VUS (c.1809T>G-p.I603M) in the most frequently mutated gene in HCM, MYBPC3, which codes for cardiac myosin-binding protein C (cMyBPC). Our determinations of pathogenicity integrate bioinformatics evaluation and functional studies of RNA splicing and protein thermodynamic stability. In silico prediction and mRNA analysis indicated no alteration of RNA splicing induced by the variant. At the protein level, the p.I603M mutation maps to the C4 domain of cMyBPC. Although the mutation does not perturb much the overall structure of the C4 domain, the stability of C4 I603M is severely compromised as detected by circular dichroism and differential scanning calorimetry experiments. Taking into account the highly destabilizing effect of the mutation in the structure of C4, we propose reclassification of variant p.I603M as likely pathogenic. Looking into the future, the workflow described here can be used to refine the assignment of pathogenicity of variants of uncertain significance in MYBPC3.
Collapse
Affiliation(s)
- Maria Rosaria Pricolo
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain. .,Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università Federico II, Naples, Italy.
| | - Elías Herrero-Galán
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | - Cristina Mazzaccara
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università Federico II, Naples, Italy.,CEINGE Biotecnologie Avanzate s.c. a r.l., Naples, Italy
| | - Maria Angela Losi
- Dipartimento di Scienze Biomediche Avanzate, Università Federico II, Naples, Italy
| | | | - Giulia Frisso
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università Federico II, Naples, Italy.,CEINGE Biotecnologie Avanzate s.c. a r.l., Naples, Italy
| |
Collapse
|
19
|
Zheng Q, Zhang Y, Montazerian M, Gulbiten O, Mauro JC, Zanotto ED, Yue Y. Understanding Glass through Differential Scanning Calorimetry. Chem Rev 2019; 119:7848-7939. [DOI: 10.1021/acs.chemrev.8b00510] [Citation(s) in RCA: 154] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qiuju Zheng
- School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Yanfei Zhang
- School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Maziar Montazerian
- Vitreous Materials Laboratory (LaMaV), Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), 13.565-905 São Carlos, SP, Brazil
| | - Ozgur Gulbiten
- Science and Technology Division, Corning Incorporated, Corning, New York 14831, United States
| | - John C. Mauro
- School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Edgar D. Zanotto
- Vitreous Materials Laboratory (LaMaV), Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), 13.565-905 São Carlos, SP, Brazil
| | - Yuanzheng Yue
- School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
- State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
- Department of Chemistry and Bioscience, Aalborg University, DK-9220 Aalborg, Denmark
| |
Collapse
|
20
|
Souery WN, Arun Kumar S, Prasca-Chamorro D, Moore DM, Good J, Bishop CJ. Controlling and quantifying the stability of amino acid-based cargo within polymeric delivery systems. J Control Release 2019; 300:102-113. [PMID: 30826372 DOI: 10.1016/j.jconrel.2019.02.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 02/26/2019] [Accepted: 02/27/2019] [Indexed: 12/23/2022]
Abstract
In recent years, the rapid growth and availability of protein and peptide therapeutics has not only expanded the boundaries of modern science but has also revolutionized the practice of medicine today. The potential of such therapies, however, is greatly limited by the innate instabilities of proteins and peptides, which is further magnified during therapeutic formulation processing, transport, storage, and administration. In this paper, we will consider the unique stability challenges associated with protein/peptide polymeric delivery systems from an engineering approach oriented towards the quantification and modification of amino acid-based cargo stability. While a number of methods have been developed for the purposes of quantifying factors affecting protein and peptide stability, current measurement techniques remain largely limited in scope in regard to polymeric drug delivery systems. This paper will primarily describe the influence of water content, pH, and temperature on protein and peptide stability within polymer-based delivery systems. Moreover, we will review current instrumentation used to quantify factors affecting protein/peptide stability with respect to water content, pH, and temperature. Lastly, we will outline several recommendations to help guide future research efforts to develop methods more specific to quantifying protein/peptide stability within polymer-based delivery systems.
Collapse
Affiliation(s)
- Whitney Nicole Souery
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, 101 Bizzell St., College Station, TX 77843, USA.
| | - Shreedevi Arun Kumar
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, 101 Bizzell St., College Station, TX 77843, USA.
| | - Daniel Prasca-Chamorro
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, 101 Bizzell St., College Station, TX 77843, USA.
| | - David Mitchell Moore
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, 101 Bizzell St., College Station, TX 77843, USA.
| | - Jacob Good
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, 101 Bizzell St., College Station, TX 77843, USA.
| | - Corey J Bishop
- Department of Biomedical Engineering, Texas A&M University, Emerging Technologies Building, 101 Bizzell St., College Station, TX 77843, USA.
| |
Collapse
|
21
|
Cholakova D, Denkov N, Tcholakova S, Valkova Z, Smoukov SK. Multilayer Formation in Self-Shaping Emulsion Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5484-5495. [PMID: 30924339 DOI: 10.1021/acs.langmuir.8b02771] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In several recent studies, we showed that micrometer-sized oil-in-water emulsion droplets from alkanes, alkenes, alcohols, triglycerides, or mixtures of these components can spontaneously "self-shape" upon cooling into various regular shapes, such as regular polyhedrons, platelets, rods, and fibers ( Denkov , N. , Nature 2015 , 528 , 392 ; Cholakova , D. , Adv. Colloid Interface Sci. 2016 , 235 , 90 ). These drop-shape transformations were explained by assuming that intermediate plastic rotator phase, composed of ordered multilayers of oily molecules, is formed beneath the drop surface around the oil-freezing temperature. An alternative explanation was proposed ( Guttman , S. , Proc. Natl. Acad. Sci. USA 2016 113 , 493 ; Guttman , S. , Langmuir 2017 , 33 , 1305 ), which is based on the assumption that the oil-water interfacial tension decreases to very low values upon emulsion cooling. Here, we present new results, obtained by differential scanning calorimetry (DSC), which quantify the enthalpy effects accompanying the drop-shape transformations. Using optical microscopy, we related the peaks in the DSC thermograms to the specific changes in the drop shape. Furthermore, from the enthalpies measured by DSC, we determined the fraction of the intermediate phase involved in the processes of drop deformation. The obtained results support the explanation that the drop-shape transformations are intimately related to the formation of ordered multilayers of alkane molecules with thickness varying between several and dozens of layers of alkane molecules, depending on the specific system. The new results provide the basis for a rational approach to the mechanistic explanation and to the fine control of this fascinating and industrially relevant phenomenon.
Collapse
Affiliation(s)
- Diana Cholakova
- Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy , Sofia University , 1 James Bourchier Avenue , 1164 Sofia , Bulgaria
| | - Nikolai Denkov
- Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy , Sofia University , 1 James Bourchier Avenue , 1164 Sofia , Bulgaria
| | - Slavka Tcholakova
- Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy , Sofia University , 1 James Bourchier Avenue , 1164 Sofia , Bulgaria
| | - Zhulieta Valkova
- Department of Chemical and Pharmaceutical Engineering, Faculty of Chemistry and Pharmacy , Sofia University , 1 James Bourchier Avenue , 1164 Sofia , Bulgaria
| | - Stoyan K Smoukov
- Active and Intelligent Materials Lab, School of Engineering and Materials Science , Queen Mary University of London , Mile End Road , London E14NS , UK
| |
Collapse
|
22
|
Wei Y, Zhang T, Yu F, Xue Y, Li Z, Wang Y, Xue C. Effects of curdlan on the texture and structure of Alaska pollock surimi gels treated at 120°C. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2018. [DOI: 10.1080/10942912.2017.1306557] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Yinong Wei
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Tao Zhang
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Fanqianhui Yu
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Yong Xue
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Zhaojie Li
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Yuming Wang
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Changhu Xue
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| |
Collapse
|
23
|
Han SM, Baek JS, Kim MS, Hwang SJ, Cho CW. Surface modification of paclitaxel-loaded liposomes using d-α-tocopheryl polyethylene glycol 1000 succinate: Enhanced cellular uptake and cytotoxicity in multidrug resistant breast cancer cells. Chem Phys Lipids 2018; 213:39-47. [DOI: 10.1016/j.chemphyslip.2018.03.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 02/20/2018] [Accepted: 03/13/2018] [Indexed: 11/28/2022]
|
24
|
Tumhom S, Krusong K, Kidokoro SI, Katoh E, Pongsawasdi P. Significance of H461 at subsite +1 in substrate binding and transglucosylation activity of amylomaltase from Corynebacterium glutamicum. Arch Biochem Biophys 2018; 652:3-8. [PMID: 29885290 DOI: 10.1016/j.abb.2018.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 05/28/2018] [Accepted: 06/05/2018] [Indexed: 10/14/2022]
Abstract
Amylomaltase (AM) catalyzes inter- and intra-molecular transglycosylation reactions of glucan to yield linear and cyclic oligosaccharide products. The functional roles of the conserved histidine at position 461 in the active site of AM from Corynebacterium glutamicum (CgAM) was investigated. H461 A/S/D/R/W were constructed, their catalytic properties were compared to the wild-type (WT). A significant decrease in transglucosylation activities was observed, especially in H461A mutant, while hydrolysis activity was barely affected. The transglucosylation factor of the H461A-CgAM was decreased by 8.6 folds. WT preferred maltotriose (G3) as substrate for disproportionation reaction, but all H461 mutants showed higher preference for maltose (G2). Using G3 substrate, kcat/Km values of H461 mutated CgAMs were 40-64 folds lower, while the Km values were twice higher than those of WT. All mutants could not produce large-ring cyclodextrin (LR-CD) product. The heat capacity profile indicated that WT had higher thermal stability than H461A. The X-ray structure of WT showed two H-bonds between H461 and heptasaccharide analog at subsite +1, while no such bonding was observed from the model structure of H461A. The importance of H461 on substrate binding with CgAM was evidenced. We are the first to mutate an active site histidine in AM to explore its function.
Collapse
Affiliation(s)
- Suthipapun Tumhom
- Starch and Cyclodextrin Research Unit, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Kuakarun Krusong
- Starch and Cyclodextrin Research Unit, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand; Structural and Computational Biology Research Group, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Shun-Ichi Kidokoro
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Niigata, 940-2188, Japan
| | - Etsuko Katoh
- Structural Biology Research Unit, Advanced Analysis Center, National Agriculture and Food Research Organization, 3-1-3 Kannondai, Tsukuba, 305-8617, Ibaraki, Japan
| | - Piamsook Pongsawasdi
- Starch and Cyclodextrin Research Unit, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.
| |
Collapse
|
25
|
Liu X, Feng D, Ji L, Zhang T, Xue Y, Xue C. Effects of microwave heating on the gelation properties of heat-induced Alaska Pollock (Theragra chalcogramma) surimi. FOOD SCI TECHNOL INT 2018; 24:497-506. [DOI: 10.1177/1082013218768411] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In the present study, we examined the properties of Alaska Pollock ( Theragra chalcogramma) surimi gels in response microwave heating at different powers (300, 400, or 500 W) and time (10, 20, or 30 min). The surimi gels heated by a microwave at 300 W for 10 min showed the highest gel strength and water-holding capacity. Increasing the power and time resulted in decreases in both the gel strength and water-holding capacity. The gel formation rate of microwave-heated gels was significantly higher than that produced by water bath heating. In addition, differential scanning calorimetry indicated that microwave heating caused less damage to the native structures of myosin and actin than water bath heating. Microstructure studies revealed that microwave heating contributed to the formation of a denser and stronger frame of the surimi gels. Raman spectroscopy indicated that the degree of the secondary structure denaturation caused by microwave heating was less than that induced by water bath heating. Thus, the results demonstrated that microwave heating is a promising method to enhance the gelation properties of surimi.
Collapse
Affiliation(s)
- Xiangyu Liu
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Dandan Feng
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Lei Ji
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Tao Zhang
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Yong Xue
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| | - Changhu Xue
- Department of Food Science and Engineering, Ocean University of China, Qingdao, PR China
| |
Collapse
|
26
|
Mukherjee S, Kar RK, Nanga RPR, Mroue KH, Ramamoorthy A, Bhunia A. Accelerated molecular dynamics simulation analysis of MSI-594 in a lipid bilayer. Phys Chem Chem Phys 2018; 19:19289-19299. [PMID: 28702543 DOI: 10.1039/c7cp01941f] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multidrug resistance against the existing antibiotics is one of the most challenging threats across the globe. Antimicrobial peptides (AMPs), in this regard, are considered to be one of the effective alternatives that can overcome bacterial resistance. MSI-594, a 24-residue linear alpha-helical cationic AMP, has been shown to function via the carpet mechanism to disrupt bacterial membrane systems. To better understand the role of lipid composition in the function of MSI-594, in the present study, eight different model membrane systems have been studied using accelerated molecular dynamics (aMD) simulations. The simulated results are helpful in discriminating the particular effects of cationic MSI-594 against zwitterionic POPC, anionic POPG and POPS, and neutral POPE lipid moieties. Additionally, the effects of various heterogeneous POPC/POPG (7 : 3), POPC/POPS (7 : 3), and POPG/POPE (1 : 3 and 3 : 1) bilayer systems on the dynamic interaction of MSI-594 have also been investigated. The effect on the lipid bilayer due to the interaction with the peptide is characterized by lipid acyl-chain order, membrane thickness, and acyl-chain dynamics. Our simulation results show that the lipid composition affects the membrane interaction of MSI-594, suggesting that membrane selectivity is crucial to its mechanism of action. The results reported in this study are helpful to obtain accurate atomistic-level information governing MSI-594 and its membrane disruptive antimicrobial mechanism of action, and to design next generation potent antimicrobial peptides.
Collapse
Affiliation(s)
- Shruti Mukherjee
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700 054, India.
| | - Rajiv K Kar
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700 054, India.
| | - Ravi Prakash Reddy Nanga
- Biophysics Program and Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA. and Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kamal H Mroue
- Biophysics Program and Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA.
| | - Ayyalusamy Ramamoorthy
- Biophysics Program and Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA.
| | - Anirban Bhunia
- Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata 700 054, India.
| |
Collapse
|
27
|
Calorimetry Methods to Study Membrane Interactions and Perturbations Induced by Antimicrobial Host Defense Peptides. Methods Mol Biol 2018; 1548:119-140. [PMID: 28013501 DOI: 10.1007/978-1-4939-6737-7_9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2023]
Abstract
Biological membranes play an important role in determining the activity and selectivity of antimicrobial host defense peptides (AMPs). Several biophysical methods have been developed to study the interactions of AMPs with biological membranes. Isothermal titration calorimetry and differential scanning calorimetry (ITC and DSC, respectively) are powerful techniques as they provide a unique label-free approach. ITC allows for a complete thermodynamic characterization of the interactions between AMPs and membranes. DSC allows one to study the effects of peptide binding on the packing of the phospholipids in the membrane. Used in combination with mimetic models of biological membranes, such as phospholipid vesicles, the role of different phospholipid headgroups and distinct acyl chains can be characterized. In these protocols the use of ITC and DSC methods for the study of peptide-membrane interactions will be presented, highlighting the importance of membrane model systems selected to represent bacterial and mammalian cells. These studies provide valuable insights into the mechanisms involved in the membrane binding and perturbation properties of AMPs.
Collapse
|
28
|
Seighalani FZB, Bakar J, Saari N, Khoddami A. Thermal and physicochemical properties of red tilapia (Oreochromis niloticus) surimi gel as affected by microbial transglutaminase. ANIMAL PRODUCTION SCIENCE 2017. [DOI: 10.1071/an15633] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Thermal and physicochemical properties of red tilapia (Oreochromis niloticus) surimi gel incorporated with different levels of microbial transglutaminase (MTGase) were investigated. Surimi samples mixed with various concentrations of MTGase were subjected to two-stages heating (at 45°C followed by 90°C) to prepare surimi gel. Samples formulated with 0.30 MTGase (units/g surimi) showed the highest breaking force and deformation, and lowest expressible water content among treatments. Highest storage modulus was found in the gels mixed with 0.30 MTGase (units/g surimi). Compared with control surimi gel, addition of microbial transglutaminase to levels 0.10, 0.20 and 0.30 (units/g surimi) increased the enthalpy and maximum transition temperature of myosin. Results suggest that up to 0.30 MTGase (units/g surimi) could improve texture, colour, water-holding capacity, elasticity and thermal stability of red tilapia surimi gel.
Collapse
|
29
|
The physical chemistry of high-sensitivity differential scanning calorimetry of biopolymers. CHEMTEXTS 2017; 3:1. [PMID: 30637187 PMCID: PMC6313365 DOI: 10.1007/s40828-016-0038-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 12/01/2016] [Indexed: 11/06/2022]
Abstract
High-sensitivity differential scanning calorimetry (HSDSC) is widely used to examine the thermal behaviour of biomolecules and water-soluble polymers in aqueous solution. The principal purpose of this manuscript is to examine the thermodynamic basis for the signals obtained using HSDSC. It is shown that a combination of the van’t Hoff isochore and Kirchhoff’s equation are all that is necessary to simulate and curve fit the HSDSC output obtained for the thermally induced unfolding of the protein ubiquitin. The treatment is further developed to show how the temperature dependence of the heat capacity change of unfolding, multiple sequential transitions, and protein dissociation can be incorporated into the thermodynamic description of protein unfolding and how these factors in turn affect the HSDSC signal.
Collapse
|
30
|
Eleftheriou K, Sideratou Z, Thanassoulas A, Papakyriakou A, Tsiourvas D. Comparative Experimental and Computational Study of Monoalkyl Chain Phosphatidylcholine-Containing Thermoresponsive Liposomes. J Phys Chem B 2016; 120:5417-28. [PMID: 27280363 DOI: 10.1021/acs.jpcb.6b02783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Liposomes containing lysophospholipids are intensively studied as drug delivery systems that are stable at normal body temperature but exhibit fast release of their drug load at slightly elevated temperatures. In this study, the stability and release properties of dipalmitoylglycerophosphocholine (DPPC)-based liposomes incorporating the commonly used lysophosphatidylocholine (lyso-PC), and a series of monoalkyl chain ether-linked phosphatidylcholine, i.e., the biologically relevant monoalkyl chain platelet activating factor (PAF) and its derivatives lyso-PAF and methyl-PAF, were investigated. To this end a series of PEGylated small unilamellar liposomes with DPPC:monoalkyl lipid compositions of 5% and 10% molar ratio were prepared and compared with regard to stability (37 °C) and release properties at elevated temperatures (38-43 °C). All systems were characterized with respect to size distribution, ζ-potential, and phase transition characteristics. The presence of ether-lipids endows liposomes with superior (∼10% increase) release properties at 5% incorporation compared to lyso-PC, while at 10% molar ratio the formulations do not differ significantly, the release being close to 90%. The findings are supported by atomistic molecular dynamics simulations that suggest a correlation between the enhanced permeability and increased penetration of water molecules within the bilayers with density fluctuations resulting from the increased area-per-lipid and the disorder of the lysolipids alkyl chains.
Collapse
Affiliation(s)
- Kleopatra Eleftheriou
- Institute of Nanoscience and Nanotechology, NCSR ''Demokritos" , 15310 Aghia Paraskevi, Attiki, Greece
| | - Zili Sideratou
- Institute of Nanoscience and Nanotechology, NCSR ''Demokritos" , 15310 Aghia Paraskevi, Attiki, Greece
| | - Angelos Thanassoulas
- Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety, NCSR ''Demokritos" , 15310 Aghia Paraskevi, Attiki, Greece
| | - Athanasios Papakyriakou
- Institute of Nanoscience and Nanotechology, NCSR ''Demokritos" , 15310 Aghia Paraskevi, Attiki, Greece
| | - Dimitris Tsiourvas
- Institute of Nanoscience and Nanotechology, NCSR ''Demokritos" , 15310 Aghia Paraskevi, Attiki, Greece
| |
Collapse
|
31
|
Harkness RW, Mittermaier AK. G-register exchange dynamics in guanine quadruplexes. Nucleic Acids Res 2016; 44:3481-94. [PMID: 27060139 PMCID: PMC4856995 DOI: 10.1093/nar/gkw190] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 03/09/2016] [Indexed: 11/23/2022] Open
Abstract
G-quadruplexes (GQs) are 4-stranded DNA structures formed by tracts of stacked, Hoogsteen-hydrogen bonded guanosines. GQs are found in gene promoters and telomeres where they regulate gene transcription and telomere elongation. Though GQ structures are well-characterized, many aspects of their conformational dynamics are poorly understood. For example, when there are surplus guanosines in some of the tracts, they can slide with respect to one another, a process we term G-register (GR) exchange. These motions could in principle entropically stabilize the folded state, crucially benefitting GQs as their stabilities are closely tied to biological function. We have developed a method for characterizing GR exchange where each isomer in the wild-type conformational ensemble is trapped by mutation and thermal denaturation data for the set of trapped mutants and wild-type are analyzed simultaneously. This yields GR isomer populations as a function of temperature, quantifies conformational entropy and sheds light on correlated sliding motions of the G-tracts. We measured entropic stabilizations from GR exchange up to 14.3 ± 1.6 J mol−1 K−1, with melting temperature increases up to 7.3 ± 1.6°C. Furthermore, bioinformatic analysis suggests a majority of putative human GQ sequences are capable of GR exchange, pointing to the generality of this phenomenon.
Collapse
Affiliation(s)
- Robert W Harkness
- McGill University, Department of Chemistry, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
| | - Anthony K Mittermaier
- McGill University, Department of Chemistry, 801 Sherbrooke St. West, Montreal, QC H3A 0B8, Canada
| |
Collapse
|
32
|
Paker I, Matak KE. Influence of pre-cooking protein paste gelation conditions and post-cooking gel storage conditions on gel texture. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:280-286. [PMID: 25641161 DOI: 10.1002/jsfa.7091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 12/03/2014] [Accepted: 01/08/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND Gelation conditions affect the setting of myofibrillar fish protein gels. Therefore the impact of widely applied pre-cooking gelation time/temperature strategies and post-cooking period on the texture and color of final protein gels was determined. Four pre-cooking gelation strategies (no setting time, 30 min at 25 °C, 1 h at 40 °C or 24 h at 4 °C) were applied to protein pastes (fish protein concentrate and standard functional additives). After cooking, texture and color were analyzed either directly or after 24 h at 4 °C on gels adjusted to 25 °C. RESULTS No-set gels were harder, gummier and chewier (P < 0.05) when analyzed immediately after cooling; however, gel chewiness, cohesiveness and firmness indicated by Kramer force benefited from 24 h at 4 °C gel setting when stored post-cooking. Gel-setting conditions had a greater (P < 0.05) effect on texture when directly analyzed and most changes occurred in no-set gels. There were significant (P < 0.05) changes between directly analyzed and post-cooking stored gels in texture and color, depending on the pre-cooking gelation strategy. CONCLUSION Pre-cooking gelation conditions will affect final protein gel texture and color, with gel stability benefiting from a gel-setting period. However, post-cooking storage may have a greater impact on final gels, with textural attributes becoming more consistent between all samples.
Collapse
Affiliation(s)
- Ilgin Paker
- Animal and Nutritional Sciences, West Virginia University, PO Box 6108, Morgantown, WV, USA
| | - Kristen E Matak
- Animal and Nutritional Sciences, West Virginia University, PO Box 6108, Morgantown, WV, USA
| |
Collapse
|
33
|
Abstract
This unit describes the application of calorimetry to characterize the thermodynamics of nucleic acids, specifically, the two major calorimetric methodologies that are currently employed: differential scanning (DSC) and isothermal titration calorimetry (ITC). DSC is used to study thermally induced order-disorder transitions in nucleic acids. A DSC instrument measures, as a function of temperature (T), the excess heat capacity (C(p)(ex)) of a nucleic acid solution relative to the same amount of buffer solution. From a single curve of C(p)(ex) versus T, one can derive the following information: the transition enthalpy (ΔH), entropy (ΔS), free energy (ΔG), and heat capacity (ΔCp); the state of the transition (two-state versus multistate); and the average size of the molecule that melts as a single thermodynamic entity (e.g., the duplex). ITC is used to study the hybridization of nucleic acid molecules at constant temperature. In an ITC experiment, small aliquots of a titrant nucleic acid solution (strand 1) are added to an analyte nucleic acid solution (strand 2), and the released heat is monitored. ITC yields the stoichiometry of the association reaction (n), the enthalpy of association (ΔH), the equilibrium association constant (K), and thus the free energy of association (ΔG). Once ΔH and ΔG are known, ΔS can also be derived. Repetition of the ITC experiment at a number of different temperatures yields the ΔCp for the association reaction from the temperature dependence of ΔH.
Collapse
Affiliation(s)
- Eriks Rozners
- Department of Chemistry, Binghamton University, State University of New York, Binghamton, New York
| | - Daniel S Pilch
- Department of Pharmacology, Rutgers Robert Wood Johnson Medical School, Piscataway, New Jersey
| | - Martin Egli
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee
| |
Collapse
|
34
|
Kumar GS, Basu A. The use of calorimetry in the biophysical characterization of small molecule alkaloids binding to RNA structures. Biochim Biophys Acta Gen Subj 2015; 1860:930-944. [PMID: 26522497 DOI: 10.1016/j.bbagen.2015.10.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 10/06/2015] [Accepted: 10/27/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND RNA has now emerged as a potential target for therapeutic intervention. RNA targeted drug design requires detailed thermodynamic characterization that provides new insights into the interactions and this together with structural data, may be used in rational drug design. The use of calorimetry to characterize small molecule-RNA interactions has emerged as a reliable and sensitive tool after the recent advancements in biocalorimetry. SCOPE OF THE REVIEW This review summarizes the recent advancements in thermodynamic characterization of small molecules, particularly some natural alkaloids binding to various RNA structures. Thermodynamic characterization provides information that can supplement structural data leading to more effective drug development protocols. MAJOR CONCLUSIONS This review provides a concise report on the use of isothermal titration calorimetry (ITC) and differential scanning calorimetry (DSC) techniques in characterizing small molecules, mostly alkaloids-RNA interactions with particular reference to binding of tRNA, single stranded RNA, double stranded RNA, poly(A), triplex RNA. GENERAL SIGNIFICANCE It is now apparent that a combination of structural and thermodynamic data is essential for rational design of specific RNA targeted drugs. Recent advancements in biocalorimetry instrumentation have led to detailed understanding of the thermodynamics of small molecules binding to various RNA structures paving the path for the development of many new natural and synthetic molecules as specific binders to various RNA structures. RNA targeted drug design, that remained unexplored, will immensely benefit from the calorimetric studies leading to the development of effective drugs for many diseases.
Collapse
Affiliation(s)
- Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India.
| | - Anirban Basu
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| |
Collapse
|
35
|
Qi G, Wang D, Zheng K, Xu J, Qi X, Zhong X. Kinetics characteristics of coal low-temperature oxidation in oxygen-depleted air. J Loss Prev Process Ind 2015. [DOI: 10.1016/j.jlp.2015.05.011] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
36
|
The deconvolution of differential scanning calorimetry unfolding transitions. Methods 2015; 76:78-86. [DOI: 10.1016/j.ymeth.2014.12.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 11/26/2014] [Accepted: 12/01/2014] [Indexed: 11/19/2022] Open
|
37
|
Effects of deacetylation of konjac glucomannan on Alaska Pollock surimi gels subjected to high-temperature (120 °C) treatment. Food Hydrocoll 2015. [DOI: 10.1016/j.foodhyd.2014.05.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
38
|
Zhang T, Xue Y, Li Z, Wang Y, Yang W, Xue C. Effects of Ozone-Induced Oxidation on the Physicochemical Properties of Myofibrillar Proteins Recovered from Bighead Carp (Hypophthalmichthys nobilis). FOOD BIOPROCESS TECH 2014. [DOI: 10.1007/s11947-014-1396-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
39
|
Halvorsen K, Agris PF. Cross-platform comparison of nucleic acid hybridization: toward quantitative reference standards. Anal Biochem 2014; 465:127-33. [PMID: 25124363 DOI: 10.1016/j.ab.2014.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 07/14/2014] [Accepted: 08/02/2014] [Indexed: 11/18/2022]
Abstract
Measuring interactions between biological molecules is vitally important to both basic and applied research as well as development of pharmaceuticals. Although a wide and growing range of techniques is available to measure various kinetic and thermodynamic properties of interacting biomolecules, it can be difficult to compare data across techniques of different laboratories and personnel or even across different instruments using the same technique. Here we evaluate relevant biological interactions based on complementary DNA and RNA oligonucleotides that could be used as reference standards for many experimental systems. We measured thermodynamics of duplex formation using isothermal titration calorimetry, differential scanning calorimetry, and ultraviolet-visible (UV-vis) monitored denaturation/renaturation. These standards can be used to validate results, compare data from disparate techniques, act as a teaching tool for laboratory classes, or potentially to calibrate instruments. The RNA and DNA standards have many attractive features, including low cost, high purity, easily measurable concentrations, and minimal handling concerns, making them ideal for use as a reference material.
Collapse
Affiliation(s)
- Ken Halvorsen
- The RNA Institute, University at Albany-SUNY, Albany, NY 12222, USA.
| | - Paul F Agris
- The RNA Institute, University at Albany-SUNY, Albany, NY 12222, USA; Department of Biological Sciences, University at Albany-SUNY, Albany, NY 12222, USA
| |
Collapse
|
40
|
Li J, Ding S, Cowan JA. Thermodynamic and structural analysis of human NFU conformational chemistry. Biochemistry 2013; 52:4904-13. [PMID: 23796308 DOI: 10.1021/bi400320s] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Human NFU has been implicated in the formation of inorganic sulfide required for cellular iron-sulfur cluster biosynthesis. The protein contains a well-structured N-terminal domain and a C-terminal domain with molten globule characteristics that also contains a thioredoxin-like pair of redox active Cys residues that promote persulfide reductase activity. Recent reports have highlighted the existence of structural flexibility in the ISU/IscU-type scaffold proteins that mediate Fe-S cluster assembly, which is also likely to serve an important role in the pathway to Fe-S cluster maturation. We have previously reported similar structural mobility for the C-terminal domain of human NFU, a protein that has been implicated in the production of sulfide for cluster synthesis, while homologous proteins have also been suggested to serve as Fe-S cluster carriers. Herein we quantitatively characterize the structural stability of the two domains of human NFU and in particular the functional C-terminal domain. The results of differential scanning calorimetry and variable temperature circular dichroism (VTCD) studies have been used to analyze the temperature-dependent structural melting profiles of the N- and C-terminal domains, relative to both full-length NFU and an equimolar ratio of the N- and C-terminal domains, and correlated with structural information derived from NMR data. Calorimetry results indicate that the C-terminal NFU domain undergoes a significant structural stabilization following interaction with the N-terminal domain, which resulted in a novel and distinctive transition melting profile (Tm(sec) = 58.1 ± 0.4 °C, ΔHv(sec) = 60.4 ± 5.3 kcal/mol, Tm(ter) = 49.3 ± 0.3 °C, ΔHv(ter) = 71.8 ± 5.8 kcal/mol). VTCD experiments also revealed a secondary structure transition at 59.2 °C in agreement with calorimetry results. The degree of stabilization was found to be more significant in the full-length NFU, as the C-terminal domain transitions were recorded at higher temperatures (Tm(sec) = 63.3 ± 3.4 °C, ΔHv(sec) = 41.8 ± 8.2 kcal/mol). The interactions between the two domains demonstrated the hallmarks of a hydrophobic character, as increased ionic strength decreased the degree of stabilization of the C-terminal domain. An increase of 2% in α-helix content further supports interaction between the two domains, leading to greater secondary structure stabilization. Heteronuclear single-quantum coherence experiments indicate that the C-terminal domain adopts an alternate tertiary conformation following binding to the N-terminal domain. The structural rigidity of the N-terminal domain leads to an alternative conformation of the C-terminal domain, suggesting that such an interaction, although weaker than that of the covalently attached native NFU, is important for the structural chemistry of the native full-length protein. The results also emphasize the likely general importance of such structural flexibility in select proteins mediating metal cofactor biosynthesis.
Collapse
Affiliation(s)
- Jingwei Li
- Evans Laboratory of Chemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | | | | |
Collapse
|
41
|
Thermodynamic and structural analysis of DNA damage architectures related to replication. J Nucleic Acids 2013; 2013:867957. [PMID: 23710336 PMCID: PMC3655575 DOI: 10.1155/2013/867957] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 04/02/2013] [Indexed: 01/21/2023] Open
Abstract
Damaged DNA, generated by the abstraction of one of five hydrogen atoms from the 2′-deoxyribose ring of the nucleic acid, can contain a variety of lesions, some of which compromise physiological processes. Recently, DNA damage, resulting from the formation of a C3′-thymidinyl radical in DNA oligomers, was found to be dependent on nucleic acid structure. Architectures relevant to DNA replication were observed to generate larger amounts of strand-break and 1-(2′-deoxy-β-D-threo-pentofuranosyl)thymidine formation than that observed for duplex DNA. To understand how this damage can affect the integrity of DNA, the impact of C3′-thymidinyl radical derived lesions on DNA stability and structure was characterized using biophysical methods. DNA architectures evaluated include duplex DNA (dsDNA), single 3′ or 5′-overhangs (OvHgs), and forks. Thermal melting analysis and differential scanning calorimetry measurements indicate that an individual 3′-OvHg is more destabilizing than a 5′-OvHg. The presence of a terminal 3′ or 5′ phosphate decreases the ΔG25 to the same extent, while the effect of the phosphate at the ss-dsDNA junction of OvHgs is dependent on sequence. Additionally, the effect of 1-(2′-deoxy-β-D-threo-pentofuranosyl)thymidine is found to depend on DNA architecture and proximity to the 3′ end of the damaged strand.
Collapse
|
42
|
Kleinstiver BP, Wolfs JM, Edgell DR. The monomeric GIY-YIG homing endonuclease I-BmoI uses a molecular anchor and a flexible tether to sequentially nick DNA. Nucleic Acids Res 2013; 41:5413-27. [PMID: 23558745 PMCID: PMC3664794 DOI: 10.1093/nar/gkt186] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The GIY-YIG nuclease domain is found within protein scaffolds that participate in diverse cellular pathways and contains a single active site that hydrolyzes DNA by a one-metal ion mechanism. GIY-YIG homing endonucleases (GIY-HEs) are two-domain proteins with N-terminal GIY-YIG nuclease domains connected to C-terminal DNA-binding and they are thought to function as monomers. Using I-BmoI as a model GIY-HE, we test mechanisms by which the single active site is used to generate a double-strand break. We show that I-BmoI is partially disordered in the absence of substrate, and that the GIY-YIG domain alone has weak affinity for DNA. Significantly, we show that I-BmoI functions as a monomer at all steps of the reaction pathway and does not transiently dimerize or use sequential transesterification reactions to cleave substrate. Our results are consistent with the I-BmoI DNA-binding domain acting as a molecular anchor to tether the GIY-YIG domain to substrate, permitting rotation of the GIY-YIG domain to sequentially nick each DNA strand. These data highlight the mechanistic differences between monomeric GIY-HEs and dimeric or tetrameric GIY-YIG restriction enzymes, and they have implications for the use of the GIY-YIG domain in genome-editing applications.
Collapse
Affiliation(s)
- Benjamin P Kleinstiver
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario N6A 5C1, Canada
| | | | | |
Collapse
|
43
|
Pagano B, Randazzo A, Fotticchia I, Novellino E, Petraccone L, Giancola C. Differential scanning calorimetry to investigate G-quadruplexes structural stability. Methods 2013; 64:43-51. [PMID: 23500655 DOI: 10.1016/j.ymeth.2013.02.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 02/19/2013] [Accepted: 02/25/2013] [Indexed: 01/20/2023] Open
Abstract
Differential Scanning Calorimetry (DSC) is a straightforward methodology to characterize the energetics of thermally-induced transitions of DNA and other biological macromolecules. Therefore, DSC has been used to study the thermodynamic stability of several nucleic acids structures. G-quadruplexes are among the most important non-canonical nucleic acid architectures that are receiving great consideration. This article reports examples on the contribution of DSC to the knowledge of G-quadruplex structures. The selected case studies show the potential of this method in investigating the structure stability of G-quadruplex forming nucleic acids, and in providing information on their structural complexity. Indeed, DSC can determine thermodynamic parameters of G-quadruplex folding/unfolding processes, but it can also be useful to reveal the formation of multiple conformations or the presence of intermediate states along the unfolding pathway, and to evaluate the impact of chemical modifications on their structural stability. This article aims to show that DSC is an important complementary methodology to structural techniques, such as NMR and X-ray crystallography, in the study of G-quadruplex forming nucleic acids.
Collapse
Affiliation(s)
- Bruno Pagano
- Dipartimento di Farmacia, Università degli Studi di Napoli "Federico II", Via D. Montesano 49, I-80131 Napoli, Italy
| | | | | | | | | | | |
Collapse
|
44
|
Differential scanning calorimetry as a tool for protein folding and stability. Arch Biochem Biophys 2013; 531:100-9. [DOI: 10.1016/j.abb.2012.09.008] [Citation(s) in RCA: 163] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/11/2012] [Accepted: 09/18/2012] [Indexed: 01/19/2023]
|
45
|
Application and use of differential scanning calorimetry in studies of thermal fluctuation associated with amyloid fibril formation. Biophys Rev 2012; 5:259-269. [PMID: 28510108 DOI: 10.1007/s12551-012-0098-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 10/10/2012] [Indexed: 12/18/2022] Open
Abstract
The aggregation of proteins into amyloid fibrils is a topic that has attracted great interest because the process is associated with the pathology of numerous human diseases. Despite considerable progress in the elucidation of the structure of amyloid fibrils and the kinetic mechanism of their formation, knowledge on the thermodynamic aspects underlying the formation and stability of amyloid fibrils is limited. In this review, we summarize recent calorimetric studies of amyloid fibril formation, with the goal of obtaining a better understanding of the causal factors that thermally induce proteins to aggregate into amyloid fibrils. Calorimetric data show that differential scanning calorimetry is a useful technique to study the causative factors that thermally trigger the conversion to the amyloid structure and highlight the physics related to the thermal fluctuation of proteins during this conversion.
Collapse
|
46
|
Yu H, Gu X, Nakano SI, Miyoshi D, Sugimoto N. Beads-on-a-string structure of long telomeric DNAs under molecular crowding conditions. J Am Chem Soc 2012; 134:20060-9. [PMID: 22934853 DOI: 10.1021/ja305384c] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The structure and stability of long telomeric DNAs, (T(2)AG(3))(n) (n = 4-20), were studied under dilute and molecular crowding conditions in the presence of Na(+) and K(+). Structural analysis showed that the long telomeric DNAs formed intramolecular G-quadruplexes under all conditions. In the presence of Na(+), the telomeric DNAs formed an antiparallel G-quadruplex under both dilute and molecular crowding conditions. However, in the presence of K(+), molecular crowding induced a conformational change from mixed to parallel. These results are consistent with numerous structural studies for G-quadruplex units under molecular crowding conditions. Thermodynamic analysis showed that G-quadruplexes under the molecular crowding conditions were obviously more stable than under dilute condition. Interestingly, this stabilization effect of molecular crowding was reduced for the longer telomeric DNAs, indicating that the G-quadruplex structure of long telomeric DNAs is not as stable under molecular crowding conditions, as implied from the large stabilization of isolated G-quadruplex units as previously reported. Moreover, a hydration study revealed that upon structure folding, the interior of a G-quadruplex unit was dehydrated, whereas the linker between two units was more hydrated. It is thus possible to propose that the linkers between G-quadruplex units are ordered structures but not random coils, which could have an important influence on the stability of the entire structure of long telomeric DNAs. These results are significant to elucidate the biological characteristics of telomeres, and can aid in the rational design of ligands and drugs targeting the telomere and related proteins.
Collapse
Affiliation(s)
- Haiqing Yu
- FIBER (Frontier Institute for Biomolecular Engineering Research), Konan University, 7-1-20 Minatijima-Minatomachi, Chuo-ku, Kobe 650-0047, Japan
| | | | | | | | | |
Collapse
|
47
|
Pietrowski BN, Tahergorabi R, Jaczynski J. Dynamic rheology and thermal transitions of surimi seafood enhanced with ω-3-rich oils. Food Hydrocoll 2012. [DOI: 10.1016/j.foodhyd.2011.10.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
48
|
Cheng W, Joshi SB, He F, Brems DN, He B, Kerwin BA, Volkin DB, Middaugh CR. Comparison of High-Throughput Biophysical Methods to Identify Stabilizing Excipients for a Model IgG2 Monoclonal Antibody: Conformational Stability and Kinetic Aggregation Measurements. J Pharm Sci 2012; 101:1701-20. [DOI: 10.1002/jps.23076] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Revised: 01/06/2012] [Accepted: 01/18/2012] [Indexed: 12/12/2022]
|
49
|
Sokoloski JE, Bevilacqua PC. Analysis of RNA folding and ligand binding by conventional and high-throughput calorimetry. Methods Mol Biol 2012; 905:145-74. [PMID: 22736003 DOI: 10.1007/978-1-61779-949-5_10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Noncoding RNAs serve myriad functions in the cell, but their biophysical properties are not well understood. Calorimetry offers direct and label-free means for characterizing the ligand-binding and thermostability properties of these RNA. We apply two main types of calorimetry--isothermal titration calorimetry (ITC) and differential scanning calorimetry (DSC)--to the characterization of these functional RNA molecules. ITC can describe ligand binding in terms of stoichiometry, affinity, and heat (enthalpy), while DSC can provide RNA stability in terms of heat capacity, melting temperature, and folding enthalpy. Here, we offer detailed experimental protocols for studying such RNA systems with commercially available conventional and high-throughput ITC and DSC instruments.
Collapse
Affiliation(s)
- Joshua E Sokoloski
- Department of Biochemistry and Molecular Biophysics, Washington University St Louis School of Medicine, St. Louis, MO, USA.
| | | |
Collapse
|
50
|
Delaittre G, Save M, Gaborieau M, Castignolles P, Rieger J, Charleux B. Synthesis by nitroxide-mediated aqueous dispersion polymerization, characterization, and physical core-crosslinking of pH- and thermoresponsive dynamic diblock copolymer micelles. Polym Chem 2012. [DOI: 10.1039/c2py20084h] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|