1
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Bogdanova LR, Nikiforova AA, Ziganshina SA, Zuev YF, Sedov IA. Influence of divalent metal cations on α-lactalbumin fibril formation. J Biol Inorg Chem 2024; 29:601-609. [PMID: 39126483 DOI: 10.1007/s00775-024-02071-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Accepted: 07/28/2024] [Indexed: 08/12/2024]
Abstract
The effect of binding of divalent metal cations (Ca2+, Cu2+, Mg2+, Mn2+, Zn2+) on the kinetics of fibril formation of bovine α-lactalbumin at acidic conditions is considered. The kinetic parameters of the process were determined using a thioflavin T fluorescence assay. The DSC thermograms of bovine α-lactalbumin in the presence and absence of cations were recorded. The duration of the lag period correlates with the changes in the thermal stability of the molten globule of the protein in the presence of cations. The final thioflavin T fluorescence intensity after formation of the mature fibrils decreases under the influence of calcium ions which strongly bind to the monomeric protein, and increases in solutions containing copper and especially zinc. These ions seem to accelerate secondary nucleation processes and change the fibril morphology, which was confirmed by atomic force microscopy imaging.
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Affiliation(s)
- L R Bogdanova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Kazan, Russia
| | - A A Nikiforova
- Department of Chemistry, Kazan Federal University, Kazan, Russia
| | - S A Ziganshina
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, Russia
| | - Yu F Zuev
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Kazan, Russia
| | - I A Sedov
- Department of Chemistry, Kazan Federal University, Kazan, Russia.
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2
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Hettinga K, Pellis L, Rombouts W, Du X, Grigorean G, Lönnerdal B. Effect of pH and protein composition on proteolysis of goat milk proteins by pepsin and pancreatin. Food Res Int 2023; 173:113294. [PMID: 37803606 DOI: 10.1016/j.foodres.2023.113294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 07/15/2023] [Accepted: 07/17/2023] [Indexed: 10/08/2023]
Abstract
The roles of protein composition, pH and enzymes in goat milk protein hydrolysis is still unclear and the proteolysis of low abundant goat milk proteins has received limited attention. The aim of this study was to study the impact of protein composition and proteolytic conditions on goat milk protein hydrolysis in a simplified digestion model. Both whole milk and infant formula were hydrolyzed at pH 2 and 4, using pepsin as well as pepsin combined with pancreatin. Intact proteins were separated from digests using spin filters, followed by bottom-up proteomics of the separated proteins. Results show that under all conditions, caseins are hydrolyzed quickly. Goat casein hydrolysis in infant formula was slightly faster than in goat whole milk, possibly due to less casein coagulation during pepsin hydrolysis at both pH 2 and 4. Several low abundant immunoactive goat milk proteins, especially immunoglobulins, GLYCAM-1 and osteopontin, resisted proteolysis more than high abundant proteins, independent of the pH and enzyme used for hydrolysis. Fast hydrolysis of casein and slow hydrolysis of immunoactive proteins may indicate a good balance between protein utilization and protection of the infant by goat milk proteins.
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Affiliation(s)
- Kasper Hettinga
- Dairy Science and Technology, Food Quality & Design Group, Wageningen University, 6708WG Wageningen, the Netherlands.
| | | | | | - Xiaogu Du
- University of California, Department of Nutrition, Davis, CA 95616, USA
| | | | - Bo Lönnerdal
- University of California, Department of Nutrition, Davis, CA 95616, USA
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3
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Li S, Sharaf MG, Rowe EM, Serrano K, Devine DV, Unsworth LD. Hemocompatibility of β-Cyclodextrin-Modified (Methacryloyloxy)ethyl Phosphorylcholine Coated Magnetic Nanoparticles. Biomolecules 2023; 13:1165. [PMID: 37627230 PMCID: PMC10452919 DOI: 10.3390/biom13081165] [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: 05/02/2023] [Revised: 07/12/2023] [Accepted: 07/18/2023] [Indexed: 08/27/2023] Open
Abstract
Adsorbing toxins from the blood to augment membrane-based hemodialysis is an active area of research. Films composed of β-cyclodextrin-co-(methacryloyloxy)ethyl phosphorylcholine (p(PMβCD-co-MPC)) with various monomer ratios were formed on magnetic nanoparticles and characterized. Surface chemistry effects on protein denaturation were evaluated and indicated that unmodified magnetic nanoparticles greatly perturbed the structure of proteins compared to coated particles. Plasma clotting assays were conducted to investigate the stability of plasma in the presence of particles, where a 2:2 monomer ratio yielded the best results for a given total surface area of particles. Total protein adsorption results revealed that modified surfaces exhibited reduced protein adsorption compared to bare particles, and pure MPC showed the lowest adsorption. Immunoblot results showed that fibrinogen, α1-antitrypsin, vitronectin, prekallikrein, antithrombin, albumin, and C3 correlated with film composition. Hemocompatibility testing with whole blood illustrated that the 1:3 ratio of CD to MPC had a negative impact on platelets, as evidenced by the increased activation, reduced response to an agonist, and reduced platelet count. Other formulations had statistically significant effects on platelet activation, but no formulation yielded apparent adverse effects on hemostasis. For the first time, p(PMβCD-co-MPC)-coated MNP were synthesized and their general hemocompatibility assessed.
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Affiliation(s)
- Shuhui Li
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada; (S.L.)
| | - Mehdi Ghaffari Sharaf
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada; (S.L.)
| | - Elyn M. Rowe
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z7, Canada (K.S.); (D.V.D.)
| | - Katherine Serrano
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z7, Canada (K.S.); (D.V.D.)
| | - Dana V. Devine
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC V6T 1Z7, Canada (K.S.); (D.V.D.)
| | - Larry D. Unsworth
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada; (S.L.)
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4
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Lajnaf R, Attia H, Ayadi MA. Technological properties and biological activities of camel α-lactalbumin - A review. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2022.105563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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5
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Binding of silver ions to alpha-lactalbumin. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Gołębiowski A, Pomastowski P, Rafińska K, Zuvela P, Wong MW, Pryshchepa O, Madajski P, Buszewski B. Functionalization of Alpha-Lactalbumin by Zinc Ions. ACS OMEGA 2022; 7:38459-38474. [PMID: 36340177 PMCID: PMC9631873 DOI: 10.1021/acsomega.2c03674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 10/14/2022] [Indexed: 06/16/2023]
Abstract
Alpha-lactalbumin (α-LA) and binding of zinc cations to protein were studied. Molecular characteristics of protein was determined by MALDI-TOF/MS and electrophoresis SDS-PAGE, and also, for complexes, it was determined by spectroscopic techniques (ATR-FT-IR and Raman) and microscopic techniques (SEM along with an EDX detector and also TEM). The pH dependence of zeta potential of α-LA was determined in saline solution. The zinc binding to the protein mechanism was investigated; zinc binding to protein kinetics, the molecular modeling by the DFT method, and electron microscopy (SEM and TEM) for microstructure observation were performed. The experiments performed indicate a quick binding process (equilibrium takes place after 2 min of incubation) which occurs onto the surface of α-LA. Zinc cations change the conformation of the protein and create spherical particles from the morphological point of view. DFT studies indicate the participation of acidic functional groups of the protein (aspartic acid and glutamic acid residues), and these have a decisive influence on the interaction with zinc cations. Application studies of general toxicity and cytotoxicity and bioavailability were conducted.
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Affiliation(s)
- Adrian Gołębiowski
- Centre
for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, 4 Wileńska Street, 87-100 Torun, Poland
- Department
of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Torun, 7 Gagarina Street, 87-100 Torun, Poland
| | - Paweł Pomastowski
- Centre
for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, 4 Wileńska Street, 87-100 Torun, Poland
| | - Katarzyna Rafińska
- Department
of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Torun, 7 Gagarina Street, 87-100 Torun, Poland
| | - Petar Zuvela
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore
| | - Ming Wah Wong
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore
| | - Oleksandra Pryshchepa
- Centre
for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, 4 Wileńska Street, 87-100 Torun, Poland
- Department
of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Torun, 7 Gagarina Street, 87-100 Torun, Poland
| | - Piotr Madajski
- Department
of Chemistry of Materials Adsorption and Catalysis, Faculty of Chemistry, Nicolaus Copernicus University in Torun, Gagarina 7, 87-100 Torun, Poland
| | - Bogusław Buszewski
- Centre
for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, 4 Wileńska Street, 87-100 Torun, Poland
- Department
of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Torun, 7 Gagarina Street, 87-100 Torun, Poland
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7
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Al-Shabib NA, Khan JM, Malik A, Rehman MT, Husain FM, AlAjmi MF, Hamdan Ali Alghamdi O, Khan A. Quinoline yellow dye stimulates whey protein fibrillation via electrostatic and hydrophobic interaction: A biophysical study. J Dairy Sci 2021; 104:5141-5151. [PMID: 33685710 DOI: 10.3168/jds.2020-19766] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 11/28/2020] [Indexed: 01/14/2023]
Abstract
Amyloid fibril formation of proteins is associated with a number of neurodegenerative diseases. Several small molecules can accelerate the amyloid fibril formation in vitro and in vivo. However, the molecular mechanism of amyloid fibrillation is still unclear. In this study, we investigated how the food dye quinoline yellow (QY) induces amyloid fibrillation in α-lactalbumin (α-LA), a major whey protein, at pH 2.0. We used several spectroscopy techniques and a microscopy technique to explore how QY provokes amyloid fibrillation in α-LA. From turbidity and Rayleigh light scattering experiments, we found that QY promotes α-LA aggregation in a concentration-dependent manner; the optimal concentration for α-LA aggregation was 0.15 to 10.00 mM. Below 0.1 mM, no aggregation occurred. Quinoline yellow-induced aggregation was a rapid process that escaped the lag phase, but it depended on the concentrations of both α-LA and QY. We also demonstrated that aggregation switched the secondary structure of α-LA from α-helices to cross-β-sheets. We then confirmed the amyloid-like structure of aggregated α-LA by transmission electron microscopy measurements. Molecular docking and simulation confirmed the stability of the α-LA-QY complex due to the formation of 1 hydrogen bond with Lys99 and 2 electrostatic interactions with Arg70 and Lys99, along with hydrophobic interactions with Leu59 and Tyr103. This study will aid in our understanding of how small molecules induce aggregation of proteins inside the stomach (low pH) and affect the digestive process.
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Affiliation(s)
- Nasser A Al-Shabib
- Department of Food Science and Nutrition, Faculty of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia.
| | - Javed Masood Khan
- Department of Food Science and Nutrition, Faculty of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia.
| | - Ajamaluddin Malik
- Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Md Tabish Rehman
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Fohad Mabood Husain
- Department of Food Science and Nutrition, Faculty of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia
| | - Mohamed F AlAjmi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | | | - Altaf Khan
- Department of Pharmacology and Toxicology, Central Laboratory, College of Pharmacy, King Saud University, 2460, Riyadh 11451, Saudi Arabia
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8
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Krajewska M, Dopierała K, Wydro P, Broniatowski M, Prochaska K. Interfacial complex of α-lactalbumin with oleic acid: effect of protein concentration and PM-IRRAS study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114089] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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9
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Shi YJ, Chiou JT, Huang CH, Lee YC, Wang LJ, Chang LS. Modification of carboxyl groups converts α-lactalbumin into an active molten globule state with membrane-perturbing activity and cytotoxicity. Int J Biol Macromol 2020; 163:1697-1706. [DOI: 10.1016/j.ijbiomac.2020.09.095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/23/2020] [Accepted: 09/14/2020] [Indexed: 10/23/2022]
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10
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α-Lactalbumin, Amazing Calcium-Binding Protein. Biomolecules 2020; 10:biom10091210. [PMID: 32825311 PMCID: PMC7565966 DOI: 10.3390/biom10091210] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 02/06/2023] Open
Abstract
α-Lactalbumin (α-LA) is a small (Mr 14,200), acidic (pI 4–5), Ca2+-binding protein. α-LA is a regulatory component of lactose synthase enzyme system functioning in the lactating mammary gland. The protein possesses a single strong Ca2+-binding site, which can also bind Mg2+, Mn2+, Na+, K+, and some other metal cations. It contains several distinct Zn2+-binding sites. Physical properties of α-LA strongly depend on the occupation of its metal binding sites by metal ions. In the absence of bound metal ions, α-LA is in the molten globule-like state. The binding of metal ions, and especially of Ca2+, increases stability of α-LA against the action of heat, various denaturing agents and proteases, while the binding of Zn2+ to the Ca2+-loaded protein decreases its stability and causes its aggregation. At pH 2, the protein is in the classical molten globule state. α-LA can associate with membranes at neutral or slightly acidic pH at physiological temperatures. Depending on external conditions, α-LA can form amyloid fibrils, amorphous aggregates, nanoparticles, and nanotubes. Some of these aggregated states of α-LA can be used in practical applications such as drug delivery to tissues and organs. α-LA and some of its fragments possess bactericidal and antiviral activities. Complexes of partially unfolded α-LA with oleic acid are cytotoxic to various tumor and bacterial cells. α-LA in the cytotoxic complexes plays a role of a delivery carrier of cytotoxic fatty acid molecules into tumor and bacterial cells across the cell membrane. Perhaps in the future the complexes of α-LA with oleic acid will be used for development of new anti-cancer drugs.
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11
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Disentangling the role of solvent polarity and protein solvation in folding and self-assembly of α-lactalbumin. J Colloid Interface Sci 2020; 561:749-761. [DOI: 10.1016/j.jcis.2019.11.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 10/29/2019] [Accepted: 11/14/2019] [Indexed: 12/31/2022]
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12
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Rao E, Foderà V, Leone M, Vetri V. Direct observation of alpha-lactalbumin, adsorption and incorporation into lipid membrane and formation of lipid/protein hybrid structures. Biochim Biophys Acta Gen Subj 2019; 1863:784-794. [PMID: 30742952 DOI: 10.1016/j.bbagen.2019.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 02/06/2019] [Accepted: 02/07/2019] [Indexed: 02/02/2023]
Abstract
The interaction between proteins and membranes is of great interest in biomedical and biotechnological research for its implication in many functional and dysfunctional processes. We present an experimental study on the interaction between model membranes and alpha-lactalbumin (α-La). α-La is widely studied for both its biological function and its anti-tumoral properties. We use advanced fluorescence microscopy and spectroscopy techniques to characterize α-La-membrane mechanisms of interaction and α-La-induced modifications of membranes when insertion of partially disordered regions of protein chains in the lipid bilayer is favored. Moreover, using fluorescence lifetime imaging, we are able to distinguish between protein adsorption and insertion in the membranes. Our results indicate that, upon addition of α-La to giant vesicles samples, protein is inserted into the lipid bilayer with rates that are concentration-dependent. The formation of heterogeneous hybrid protein-lipid co-aggregates, paralleled with protein conformational and structural changes, alters the membrane structure and morphology, leading to an increase in membrane fluidity.
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Affiliation(s)
- Estella Rao
- Dipartimento di Fisica e Chimica, Università di Palermo, 90128 Palermo, Italy
| | - Vito Foderà
- Department of Pharmacy, Universitetsparken 2, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Maurizio Leone
- Dipartimento di Fisica e Chimica, Università di Palermo, 90128 Palermo, Italy
| | - Valeria Vetri
- Dipartimento di Fisica e Chimica, Università di Palermo, 90128 Palermo, Italy.
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13
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Nasreen K, Ahamad S, Ahmad F, Hassan MI, Islam A. Macromolecular crowding induces molten globule state in the native myoglobin at physiological pH. Int J Biol Macromol 2017; 106:130-139. [PMID: 28811208 DOI: 10.1016/j.ijbiomac.2017.08.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 07/26/2017] [Accepted: 08/01/2017] [Indexed: 01/07/2023]
Abstract
Here, we report the formation of molten globule state of the native myoglobin in crowded environment. We have used Soret absorption spectroscopy and far-UV circular dichroism to monitor changes in tertiary and secondary structures of myoglobin, respectively. Our results reveal that in the presence of ficoll 70, the secondary structure of myoglobin remains unchanged while tertiary structure is lost significantly. 1-anilinonaphthalene-8-sulfonate binding experiments showed that myoglobin in the presence of various concentrations of ficoll 70, has newly exposed hydrophobic surfaces. Dynamic light scattering measurements show that there is almost 1.5 times increase in the hydrodynamic volume of myoglobin in the crowded environment. These structural characteristics of myoglobin in the presence of 300mg/ml ficoll 70 resemble those of molten globule state. Isothermal titration calorimetric (ITC) measurements show that ficoll 70 binds to myoglobin, whereas it shows no interaction with apo form of the protein. ITC results indicate that the reason behind this unique behavior of ficoll 70 towards myoglobin may be interaction of ficoll 70 with the heme group of myoglobin, which was further confirmed by the docking studies. We hypothesize that the soft interactions between heme and ficoll 70 leads to the formation of molten globule in myoglobin.
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Affiliation(s)
- Khalida Nasreen
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Shahzaib Ahamad
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Faizan Ahmad
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Md Imtaiyaz Hassan
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Asimul Islam
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, 110025, India.
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14
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α-Lactalbumin and sodium dodecyl sulfate aggregates: Denaturation, complex formation and time stability. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.07.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Mensch C, Barron LD, Johannessen C. Ramachandran mapping of peptide conformation using a large database of computed Raman and Raman optical activity spectra. Phys Chem Chem Phys 2016; 18:31757-31768. [DOI: 10.1039/c6cp05862k] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel ROA database is reported that assigns peptide structures in detail by pattern recognition of the experimental spectrum.
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Affiliation(s)
- Carl Mensch
- Department of Chemistry
- University of Antwerp
- Antwerp
- Belgium
- Department of Inorganic and Physical Chemistry
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16
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Sales AE, Breydo L, Porto TS, Porto ALF, Uversky VN. Hydrophobicity-dependent effects of polymers on different protein conformations. RSC Adv 2016. [DOI: 10.1039/c6ra07910e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Polymers can either induce or disrupt secondary and tertiary structure in partially disordered protein conformations. The balance of the forces driving these structural changes depends on the polymer hydrophobicity and protein sequence and structure.
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Affiliation(s)
- Amanda E. Sales
- Department of Molecular Medicine and Byrd Alzheimer's Research Institute
- Morsani College of Medicine
- University of South Florida
- Tampa
- USA
| | - Leonid Breydo
- Department of Molecular Medicine and Byrd Alzheimer's Research Institute
- Morsani College of Medicine
- University of South Florida
- Tampa
- USA
| | - Tatiana S. Porto
- Academic Unit of Garanhuns
- Federal Rural University of Pernambuco
- Garanhuns
- Brazil
| | - Ana L. F. Porto
- Department of Morphology and Animal Physiology
- Federal Rural University of Pernambuco
- 52171-900 Recife
- Brazil
| | - Vladimir N. Uversky
- Department of Molecular Medicine and Byrd Alzheimer's Research Institute
- Morsani College of Medicine
- University of South Florida
- Tampa
- USA
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17
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Valipour M, Maghami P, Habibi-Rezaei M, Sadeghpour M, Khademian MA, Mosavi K, Sheibani N, Moosavi-Movahedi AA. Interaction of insulin with methyl tert-butyl ether promotes molten globule-like state and production of reactive oxygen species. Int J Biol Macromol 2015; 80:610-4. [PMID: 26193678 DOI: 10.1016/j.ijbiomac.2015.07.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 07/14/2015] [Accepted: 07/15/2015] [Indexed: 11/25/2022]
Abstract
Interaction of methyl tert-butyl ether (MTBE) with proteins is a new look at its potential adverse biological effects. When MTBE is released to the environment it enters the blood stream through inhalation, and could affect the properties of various proteins. Here we investigated the interaction of MTBE with insulin and its effect on insulin structural changes. Our results showed that insulin formed a molten globule (MG)-like structure in the presence of 8 μM MTBE under physiological pH. The insulin structural changes were studied using spectroscopy methods, viscosity calculation, dynamic light scattering and differential scanning calorimetry. To delineate the mechanisms involved in MTBE-protein interactions, the formation of reactive oxygen specious (ROS) and formation of protein aggregates were measured. The chemiluminscence experiments revealed an increase in ROS production in the presence of MTBE especially in the MG-like state. These results were further confirmed by the aggregation tests, which indicated more aggregation of insulin at 40 μM MTBE compared with 8 μM. Thus, the formation of initial aggregates and exposure of the hydrophobic patches upon formation of the MG-like state in the presence of MTBE drives protein oxidation and ROS generation.
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Affiliation(s)
- Masoumeh Valipour
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran
| | - Parvaneh Maghami
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | - Mostafa Sadeghpour
- Office of Health, Safety and Environment (HSE) Oil Ministry, Tehran, Iran
| | | | - Khadijeh Mosavi
- Office of Health, Safety and Environment (HSE) Oil Ministry, Bandar Mahshahr, Iran
| | - Nader Sheibani
- Departments of Ophthalmology and Visual Sciences and Biomedical Engineering, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Ali Akbar Moosavi-Movahedi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran.
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18
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Richa T, Sivaraman T. Computational analyses of cryptic intermediates in the native unfolding pathways of barnase and thioredoxin. Biologia (Bratisl) 2015. [DOI: 10.1515/biolog-2015-0063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Litwińczuk A, Ryu SR, Nafie LA, Lee JW, Kim HI, Jung YM, Czarnik-Matusewicz B. The transition from the native to the acid-state characterized by multi-spectroscopy approach: study for the holo-form of bovine α-lactalbumin. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:593-606. [PMID: 24389233 DOI: 10.1016/j.bbapap.2013.12.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 12/09/2013] [Accepted: 12/24/2013] [Indexed: 12/26/2022]
Abstract
The transition of the holo-form of bovine α-lactalbumin from the native (N) to the pH-generated acidic-state (A-state) was analyzed by probing its tertiary and secondary structure using a concerted spectroscopic approach combining near- and far-UV circular dichroism (CD), electrospray ionization ion mobility mass spectrometry (ESI-IM-MS), vibrational circular dichroism (VCD), and Fourier transform infrared spectroscopy (FTIR) in the attenuated total reflection (ATR) and transmission (TR) modes. The spectroscopic results, which relied on the interaction of an electromagnetic field with different molecular targets, confirmed the decay of extensive rigid side-chain packing interactions during the pH-induced N→A-state transition and revealed the targets' dependence on secondary structural changes. Independent analyses of the spectral changes using two methods of multivariate analysis, such as principal component analysis and two-dimensional correlation spectroscopy, revealed small but significant differences in the secondary structure as a result of the all-or-none transition. The cooperativity of the transition was quantitatively described using values corresponding to the mid-point (tm) and width of the transition (Δtm). The averages of the two parameters, calculated using the data collected by the different probes, were equal to 3.5±0.2 and 0.6±0.1(SE), respectively. The variable two-state nature of the cooperative N→A-state transition confirmed that the protonation of the side chain carboxyl groups on the Asp and Glu residues and that the release of a Ca(2+) ion induced structural changes on both the secondary and tertiary levels. The changes have been confirmed by results obtained from the concerted spectroscopic approach.
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Affiliation(s)
- Adriana Litwińczuk
- Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Soo Ryeon Ryu
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 200-701, Republic of Korea
| | - Laurence A Nafie
- Department of Chemistry, Syracuse University, Syracuse, NY 13244, USA
| | - Jong Wha Lee
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Hugh I Kim
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea; Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Young Mee Jung
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 200-701, Republic of Korea.
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Khan JM, Qadeer A, Ahmad E, Ashraf R, Bhushan B, Chaturvedi SK, Rabbani G, Khan RH. Monomeric banana lectin at acidic pH overrules conformational stability of its native dimeric form. PLoS One 2013; 8:e62428. [PMID: 23638080 PMCID: PMC3637162 DOI: 10.1371/journal.pone.0062428] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2013] [Accepted: 03/21/2013] [Indexed: 11/18/2022] Open
Abstract
Banana lectin (BL) is a homodimeric protein categorized among jacalin-related family of lectins. The effect of acidic pH was examined on conformational stability of BL by using circular dichroism, intrinsic fluorescence, 1-anilino-8-napthalene sulfonate (ANS) binding, size exclusion chromatography (SEC) and dynamic light scattering (DLS). During acid denaturation of BL, the monomerization of native dimeric protein was found at pH 2.0. The elution profile from SEC showed two different peaks (59.65 ml & 87.98 ml) at pH 2.0 while single peak (61.45 ml) at pH 7.4. The hydrodynamic radii (R h) of native BL was 2.9 nm while at pH 2.0 two species were found with R h of 1.7 and 3.7 nm. Furthermore at, pH 2.0 the secondary structures of BL remained unaltered while tertiary structure was significantly disrupted with the exposure of hydrophobic clusters confirming the existence of molten globule like state. The unfolding of BL with different subunit status was further evaluated by urea and temperature mediated denaturation to check their stability. As inferred from high Cm and ΔG values, the monomeric form of BL offers more resistance towards chemical denaturation than the native dimeric form. Besides, dimeric BL exhibited a Tm of 77°C while no loss in secondary structures was observed in monomers even up to 95°C. To the best of our knowledge, this is the first report on monomeric subunit of lectins showing more stability against denaturants than its native dimeric state.
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Affiliation(s)
- Javed M. Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Atiyatul Qadeer
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Ejaz Ahmad
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Raghib Ashraf
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Bharat Bhushan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Sumit K. Chaturvedi
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Gulam Rabbani
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Rizwan H. Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
- * E-mail:
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Wagner GE, Sakhaii P, Bermel W, Zangger K. Monitoring fast reactions by spatially-selective and frequency-shifted continuous NMR spectroscopy: application to rapid-injection protein unfolding. Chem Commun (Camb) 2013; 49:3155-7. [DOI: 10.1039/c3cc39107h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bhattacharyya S, Varadarajan R. Packing in molten globules and native states. Curr Opin Struct Biol 2012; 23:11-21. [PMID: 23270864 DOI: 10.1016/j.sbi.2012.10.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Accepted: 10/31/2012] [Indexed: 11/26/2022]
Abstract
Close packing of hydrophobic residues in the protein interior is an important determinant of protein stability. Cavities introduced by large to small substitutions are known to destabilize proteins. Conversely, native states of proteins and protein fragments can be stabilized by filling in existing cavities. Molten globules (MGs) were initially used to describe a state of protein which has well-defined secondary structure but little or no tertiary packing. Subsequent studies have shown that MGs do have some degree of native-like topology and specific packing. Wet molten globules (WMGs) with hydrated cores and considerably decreased packing relative to the native state have been studied extensively. Recently there has been renewed interest in identification and characterization of dry molten globules (DMGs). These are slightly expanded forms of the native state which show increased conformational flexibility, native-like main-chain hydrogen bonding and dry interiors. The generality of occurrence of DMGs during protein unfolding and the extent and nature of packing in DMGs remain to be elucidated. Packing interactions in native proteins and MGs can be probed through mutations. Next generation sequencing technologies make it possible to determine relative populations of mutants in a large pool. When this is coupled to phenotypic screens or cell-surface display, it becomes possible to rapidly examine large panels of single-site or multi-site mutants. From such studies, residue specific contributions to protein stability and function can be estimated in a highly parallelized fashion. This complements conventional biophysical methods for characterization of packing in native states and molten globules.
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Alessandri S, Sancho A, Vieths S, Mills CEN, Wal JM, Shewry PR, Rigby N, Hoffmann-Sommergruber K. High-throughput NMR assessment of the tertiary structure of food allergens. PLoS One 2012; 7:e39785. [PMID: 22768312 PMCID: PMC3388089 DOI: 10.1371/journal.pone.0039785] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 05/30/2012] [Indexed: 11/25/2022] Open
Abstract
Background In vitro component-resolved diagnosis of food allergy requires purified allergens that have to meet high standards of quality. These include the authentication of their conformation, which is relevant for the recognition by specific IgE antibodies from allergic patients. Therefore, highly sensitive and reliable screening methods for the analysis of proteins/allergens are required to assess their structural integrity. In the present study one-dimensional 1H Nuclear Magnetic Resonance (1D 1H-NMR) analysis was adopted for the assessment of overall structural and dynamic properties and authentication of a set of relevant food allergens, including non-specific lipid transfer proteins from apple, peach and hazelnut, 7/8S seed storage globulins from hazelnut and peanut, 11S seed storage globulins from hazelnut and peanut, caseins from cows' and goats' milk and tropomyosin from shrimp. Methodology/Principal Findings Two sets of 1D 1H-NMR experiments, using 700 MHz and 600 MHz instruments at 298 K were carried out to determine the presence and the extent of tertiary structure. Structural similarity among members of the individual allergen families was also assessed and changes under thermal stress investigated. The nuclear magnetic resonance (NMR) results were compared with structural information available either from the literature, Protein Data Bank entries, or derived from molecular models. Conclusions/Significance 1D 1H-NMR analysis of food allergens allowed their classification into molecules with rigid, extended and ordered tertiary structures, molecules without a rigid tertiary structure and molecules which displayed both features. Differences in thermal stability were also detected. In summary, 1D 1H-NMR gives insights into molecular fold of proteins and offers an independent method for assessing structural properties of proteins.
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Affiliation(s)
- Stefano Alessandri
- CERM, Centro di Ricerca di Risonanze Magnetiche and Department of Agricultural Biotechnology, University of Florence, Florence, Italy
| | - Ana Sancho
- Institute of Food Research, Norwich, United Kingdom
| | | | | | - Jean-Michel Wal
- INRA, UR496 Immuno-Allergie Alimentaire, CEA/iBiTeC-S/SPI, CEA de Saclay, Gif sur Yvette, France
| | | | - Neil Rigby
- Institute of Food Research, Norwich, United Kingdom
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Khan MKA, Rahaman H, Ahmad F. Conformation and thermodynamic stability of pre-molten and molten globule states of mammalian cytochromes-c. Metallomics 2011; 3:327-38. [DOI: 10.1039/c0mt00078g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Bhuyan AK. Off-Pathway Status for the Alkali Molten Globule of Horse Ferricytochrome c. Biochemistry 2010; 49:7764-73. [DOI: 10.1021/bi100880d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Abani K. Bhuyan
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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Bhuyan AK. The Off-Pathway Status of the Alkali Molten Globule Is Unrelated to Heme Misligation and Trans-pH Effects: Experiments with Ferrocytochrome c. Biochemistry 2010; 49:7774-82. [DOI: 10.1021/bi100881n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Abani K. Bhuyan
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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