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Minaychev VV, Teterina AY, Smirnova PV, Menshikh KA, Senotov AS, Kobyakova MI, Smirnov IV, Pyatina KV, Krasnov KS, Fadeev RS, Komlev VS, Fadeeva IS. Composite Remineralization of Bone-Collagen Matrices by Low-Temperature Ceramics and Serum Albumin: A New Approach to the Creation of Highly Effective Osteoplastic Materials. J Funct Biomater 2024; 15:27. [PMID: 38391880 PMCID: PMC10889756 DOI: 10.3390/jfb15020027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/16/2024] [Accepted: 01/18/2024] [Indexed: 02/24/2024] Open
Abstract
This study examined the effectiveness of coating demineralized bone matrix (DBM) with amorphous calcium phosphate (DBM + CaP), as well as a composite of DBM, calcium phosphate, and serum albumin (DBM + CaP + BSA). The intact structure of DBM promotes the transformation of amorphous calcium phosphate (CaP) into dicalcium phosphate dihydrate (DCPD) with a characteristic plate shape and particle size of 5-35 µm. The inclusion of BSA in the coating resulted in a better and more uniform distribution of CaP on the surface of DBM trabeculae. MG63 cells showed that both the obtained forms of CaP and its complex with BSA did not exhibit cytotoxicity up to a concentration of 10 mg/mL in vitro. Ectopic (subcutaneous) implantation in rats revealed pronounced biocompatibility, as well as strong osteoconductive, osteoinductive, and osteogenic effects for both DBM + CaP and DBM + CaP + BSA, but more pronounced effects for DBM + CaP + BSA. In addition, for the DBM + CaP + BSA samples, there was a pronounced full physiological intrafibrillar biomineralization and proangiogenic effect with the formation of bone-morrow-like niches, accompanied by pronounced processes of intramedullary hematopoiesis, indicating a powerful osteogenic effect of this composite.
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Affiliation(s)
- Vladislav V Minaychev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
- Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiy Prospect 49, 119334 Moscow, Russia
| | - Anastasia Yu Teterina
- Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiy Prospect 49, 119334 Moscow, Russia
| | - Polina V Smirnova
- Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiy Prospect 49, 119334 Moscow, Russia
| | - Ksenia A Menshikh
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
- Center for Translational Research on Autoimmune and Allergic Disease-CAAD, Department of Health Sciences, Università del Piemonte Orientale, 28100 Novara, Italy
| | - Anatoliy S Senotov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
| | - Margarita I Kobyakova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
- Research Institute of Clinical and Experimental Lymphology-Branch of the Institute of Cytology and Genetics Siberian Branch of Russian Academy of Sciences, 630060 Novosibirsk, Russia
| | - Igor V Smirnov
- Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiy Prospect 49, 119334 Moscow, Russia
| | - Kira V Pyatina
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
| | - Kirill S Krasnov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
| | - Roman S Fadeev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
| | - Vladimir S Komlev
- Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiy Prospect 49, 119334 Moscow, Russia
| | - Irina S Fadeeva
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Russia
- Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskiy Prospect 49, 119334 Moscow, Russia
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Ashraf S, Qaiser H, Tariq S, Khalid A, Makeen HA, Alhazmi HA, Ul-Haq Z. Unraveling the versatility of human serum albumin - A comprehensive review of its biological significance and therapeutic potential. Curr Res Struct Biol 2023; 6:100114. [PMID: 38111902 PMCID: PMC10726258 DOI: 10.1016/j.crstbi.2023.100114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 12/20/2023] Open
Abstract
Human serum albumin (HSA) is a multi-domain macromolecule with diverse ligand binding capability because of its ability to allow allosteric modulation despite being a monomeric protein. Physiologically, HSA act as the primary carrier for various exogenous and endogenous compounds and fatty acids, and alter the pharmacokinetic properties of several drugs. It has antioxidant properties and is utilized therapeutically to improve the drug delivery of pharmacological agents for the treatment of several disorders. The flexibility of albumin in holding various types of drugs coupled with a variety of modifications makes this protein a versatile drug carrier with incalculable potential in therapeutics. This review provides a brief outline of the different structural properties of HSA, and its various binding sites, moreover, an overview of the genetic, biomedical, and allosteric modulation of drugs and drug delivery aspects of HSA is also included, which may be helpful in guiding advanced clinical applications and further research on the therapeutic potential of this extraordinary protein.
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Affiliation(s)
- Sajda Ashraf
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75210, Pakistan
| | - Hina Qaiser
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75210, Pakistan
| | - Sumayya Tariq
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75210, Pakistan
| | - Asaad Khalid
- Substance Abuse and Toxicology Research Center, Jazan University, P.O. Box: 114, Jazan, Saudi Arabia
- Medicinal and Aromatic Plants Research Institute, National Center for Research, P.O. Box: 2424, Khartoum, 11111, Sudan
| | - Hafiz A. Makeen
- Pharmacy Practice Research Unit, Clinical Pharmacy Department, Faculty of Pharmacy, Jazan University, Jazan, Saudi Arabia
| | - Hassan A. Alhazmi
- Substance Abuse and Toxicology Research Center, Jazan University, P.O. Box: 114, Jazan, Saudi Arabia
- Department of Pharmaceutical Chemistry and Pharmacognosy, College of Pharmacy, Jazan University, P.O. Box 114, 45142, Jazan, Saudi Arabia
| | - Zaheer Ul-Haq
- Dr. Panjwani Center for Molecular Medicine and Drug Research, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75210, Pakistan
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Marton Menendez A, Nesbitt DJ. Ionic Cooperativity between Lysine and Potassium in the Lysine Riboswitch: Single-Molecule Kinetic and Thermodynamic Studies. J Phys Chem B 2023; 127:2430-2440. [PMID: 36916791 DOI: 10.1021/acs.jpcb.3c00245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Functionality in many biological systems, including proteins and nucleic acid structures, including protein and nucleic acid riboswitch structures, can depend on cooperative kinetic behavior between multiple small molecule ligands. In this work, single-molecule FRET data on the Bacillus subtilis lysine riboswitch reveals that affinity for the cognate lysine ligand increases significantly with K+, providing evidence for synergism between lysine/K+ binding to the aptamer and successful folding of the riboswitch. To describe/interpret this more complex kinetic scenario, we explore the conventional 4-state ("square") model for aptamer binding as a function of K+. Extension into this additional dimension generates a novel "cube" model for riboswitch folding dynamics with respect to lysine/K+ binding, revealing that riboswitch folding (kfold) and unfolding (kunfold) rate constants increase and decrease dramatically with K+, respectively. Furthermore, temperature-dependent single-molecule kinetic studies indicate that the presence of K+ entropically enhances the transition state barrier to folding but partially compensates for this by increasing the overall exothermicity for lysine binding. We rationalize this behavior as evidence that K+ facilitates hydrogen bonding between the negatively charged carboxyl group of lysine and the RNA, increasing structural rigidity and lowering entropy in the binding pocket. Finally, we explore the effects of cation size with Na+ and Cs+ studies to demonstrate that K+ is optimally suited for bridging interactions between lysine and the riboswitch aptamer domain. Regulation of lysine production and transport, dictated by the riboswitch's ability to recognize and bind lysine, is therefore intimately tied to the presence of K+ in the binding pocket and is strongly modulated by local cation conditions. The results suggest an increase in lysine riboswitch functionality by sensitivity to additional species in the cellular riboswitch environment.
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Affiliation(s)
- Andrea Marton Menendez
- JILA, University of Colorado Boulder and National Institute of Standards and Technology, Boulder, Colorado 80309, United States
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - David J Nesbitt
- JILA, University of Colorado Boulder and National Institute of Standards and Technology, Boulder, Colorado 80309, United States
- Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States
- Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States
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Vita GM, De Simone G, De Marinis E, Nervi C, Ascenzi P, di Masi A. Serum albumin and nucleic acids biodistribution: from molecular aspects to biotechnological applications. IUBMB Life 2022; 74:866-879. [PMID: 35580148 DOI: 10.1002/iub.2653] [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: 03/07/2022] [Accepted: 05/06/2022] [Indexed: 11/06/2022]
Abstract
Serum albumin (SA) is the most abundant protein in plasma and represents the main carrier of endogenous and exogenous compounds. Several evidence supports the notion that SA binds single and double stranded deoxy- and ribonucleotides at two sites, with values of the dissociation equilibrium constant (i.e., Kd ) ranging from micromolar to nanomolar values. This can be relevant from a physiological and pathological point of view as in human plasma circulate cell-free nucleic acids (cfNAs), which are single and double stranded NAs released by different tissues via apoptosis, necrosis, and secretions. Albeit SA shows low hydrolytic reactivity toward DNA and RNA, the high plasma concentration of this protein and the occurrence of several SA receptors may be pivotal for sequestering and hydrolyzing cfNAs. Therefore, pathological conditions like cancer, characterized by altered levels of human SA or by altered SA post-translational modifications, may influence cfNAs distribution and metabolism. Besides, the stability, solubility, biocompatibility, and low immunogenicity make SA a golden share for biotechnological applications related to the delivery of therapeutic NAs (TNAs). Indeed, pre-clinical studies report the therapeutic potential of SA:TNAs complexes in precision cancer therapy. Here, the molecular and biotechnological implications of SA:NAs interaction are discussed, highlighting new perspectives into SA plasmatic functions. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Gian Marco Vita
- Department of Science, Section of Biomedical Sciences and Technologies, Roma Tre University, Roma, Italy
| | - Giovanna De Simone
- Department of Science, Section of Biomedical Sciences and Technologies, Roma Tre University, Roma, Italy
| | - Elisabetta De Marinis
- Department of Medical and Surgical Sciences and Biotechnologies, University of Roma "La Sapienza", Latina, Italy
| | - Clara Nervi
- Department of Medical and Surgical Sciences and Biotechnologies, University of Roma "La Sapienza", Latina, Italy
| | - Paolo Ascenzi
- Department of Science, Section of Biomedical Sciences and Technologies, Roma Tre University, Roma, Italy.,Accademia Nazionale dei Lincei, Roma, Italy
| | - Alessandra di Masi
- Department of Science, Section of Biomedical Sciences and Technologies, Roma Tre University, Roma, Italy
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Adepu KK, Bhandari D, Anishkin A, Adams SH, Chintapalli SV. Myoglobin Interaction with Lactate Rapidly Releases Oxygen: Studies on Binding Thermodynamics, Spectroscopy, and Oxygen Kinetics. Int J Mol Sci 2022; 23:ijms23094747. [PMID: 35563138 PMCID: PMC9103699 DOI: 10.3390/ijms23094747] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/22/2022] [Accepted: 04/24/2022] [Indexed: 01/27/2023] Open
Abstract
Myoglobin (Mb)-mediated oxygen (O2) delivery and dissolved O2 in the cytosol are two major sources that support oxidative phosphorylation. During intense exercise, lactate (LAC) production is elevated in skeletal muscles as a consequence of insufficient intracellular O2 supply. The latter results in diminished mitochondrial oxidative metabolism and an increased reliance on nonoxidative pathways to generate ATP. Whether or not metabolites from these pathways impact Mb-O2 associations remains to be established. In the present study, we employed isothermal titration calorimetry, O2 kinetic studies, and UV-Vis spectroscopy to evaluate the LAC affinity toward Mb (oxy- and deoxy-Mb) and the effect of LAC on O2 release from oxy-Mb in varying pH conditions (pH 6.0–7.0). Our results show that LAC avidly binds to both oxy- and deoxy-Mb (only at acidic pH for the latter). Similarly, in the presence of LAC, increased release of O2 from oxy-Mb was detected. This suggests that with LAC binding to Mb, the structural conformation of the protein (near the heme center) might be altered, which concomitantly triggers the release of O2. Taken together, these novel findings support a mechanism where LAC acts as a regulator of O2 management in Mb-rich tissues and/or influences the putative signaling roles for oxy- and deoxy-Mb, especially under conditions of LAC accumulation and lactic acidosis.
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Affiliation(s)
- Kiran Kumar Adepu
- Arkansas Children’s Nutrition Center, Little Rock, AR 72202, USA;
- Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72202, USA
- Correspondence: (K.K.A.); (S.V.C.)
| | | | - Andriy Anishkin
- Department of Biology, University of Maryland, College Park, MD 20742, USA;
| | - Sean H. Adams
- Department of Surgery, School of Medicine, University of California, Davis, CA 95616, USA;
- Center for Alimentary and Metabolic Science, University of California, Davis, CA 95616, USA
| | - Sree V. Chintapalli
- Arkansas Children’s Nutrition Center, Little Rock, AR 72202, USA;
- Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72202, USA
- Correspondence: (K.K.A.); (S.V.C.)
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6
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Rincon Pabon JP, Kochert BA, Liu YH, Richardson DD, Weis DD. Protein A does not induce allosteric structural changes in an IgG1 antibody during binding. J Pharm Sci 2021; 110:2355-2361. [PMID: 33640336 DOI: 10.1016/j.xphs.2021.02.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 02/22/2021] [Accepted: 02/23/2021] [Indexed: 10/22/2022]
Abstract
Affinity chromatography is widely used for antibody purification in biopharmaceutical production. Although there is evidence suggesting that affinity chromatography might induce structural changes in antibodies, allosteric changes in structure have not been well-explored. Here, we used hydrogen exchange-mass spectrometry (HX-MS) to reveal conformational changes in the NIST mAb upon binding with a protein A (ProA) matrix. HX-MS measurements of NIST mAb bound to in-solution and resin forms of ProA revealed regions of the CH2 and CH3 domains with increased protection from HX upon ProA binding, consistent with the known ProA binding region. In-solution ProA experiments revealed regions in the Fab with increased HX uptake when the ProA:mAb molar ratio was increased to 2:1, suggesting an allosterically induced increase in backbone flexibility. Such effects were not observed with lower ProA concentration (1:1 molar ratio) or when ProA resin was used, suggesting some kind of change in binding mode. Since all pharmaceutical processes use ProA bound to resin, our results rule out reversible allosteric effects on the NIST mAb during interaction with resin ProA. However, irreversible effects cannot be ruled out since the NIST mAb was previously exposed to ProA during its original purification.
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Affiliation(s)
- Juan P Rincon Pabon
- Department of Chemistry and the Ralph N. Adams Institute for Bioanalytical Chemistry, University of Kansas, Lawrence, KS, United States
| | - Brent A Kochert
- Analytical Research & Development Mass Spectrometry, Merck & Co., Inc., Kenilworth, NJ, USA
| | - Yan-Hui Liu
- Analytical Research & Development Mass Spectrometry, Merck & Co., Inc., Kenilworth, NJ, USA
| | - Douglas D Richardson
- Analytical Research & Development Mass Spectrometry, Merck & Co., Inc., Kenilworth, NJ, USA
| | - David D Weis
- Department of Chemistry and the Ralph N. Adams Institute for Bioanalytical Chemistry, University of Kansas, Lawrence, KS, United States.
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Paclitaxel, Imatinib and 5-Fluorouracil Increase the Unbound Fraction of Flucloxacillin In Vitro. Antibiotics (Basel) 2020; 9:antibiotics9060309. [PMID: 32521723 PMCID: PMC7345279 DOI: 10.3390/antibiotics9060309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/01/2020] [Accepted: 06/04/2020] [Indexed: 12/12/2022] Open
Abstract
Flucloxacillin (FLU), an isoxazolyl penicillin, is widely used for the treatment of different bacterial infections in intensive care units (ICU). Being highly bound to plasma proteins, FLU is prone to drug-drug interactions (DDI) when administered concurrently with other drugs. As FLU is binding to both Sudlow’s site I and site II of human serum albumin (HSA), competitive and allosteric interactions with other drugs, highly bound to the same sites, seem conceivable. Knowledge about interaction(s) of FLU with the widely used anticancer agents paclitaxel (PAC), imatinib (IMA), and 5-fluorouracil (5-FU is scarce. The effects of the selected anticancer agents on the unbound fraction of FLU were evaluated in pooled plasma as well as in HSA and α-1-acid glycoprotein (AGP) samples, the second major drug carrier in plasma. FLU levels in spiked samples were analyzed by LC-MS/MS after ultrafiltration. Significant increase in FLU unbound fraction was observed when in combination with PAC and IMA and to a lesser extent with 5-FU. Furthermore, significant binding of FLU to AGP was observed. Collectively, this is the first study showing the binding of FLU to AGP as well as demonstrating a significant DDI between PAC/IMA/5-FU and FLU.
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Noce A, Rovella V, Marrone G, Cattani G, Zingaretti V, Limongi D, D'Agostini C, Sorge R, Casasco M, Di Daniele N, Ricci G, Bocedi A. Hemodialysis biomarkers: total advanced glycation end products (AGEs) against oxidized human serum albumin (HSAox). Acta Diabetol 2019; 56:1323-1331. [PMID: 31494747 DOI: 10.1007/s00592-019-01413-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 08/22/2019] [Indexed: 10/26/2022]
Abstract
AIMS Nephropathic patients show higher levels of advanced glycation end products (AGEs) and oxidized human serum albumin (HSAox) compared to healthy subjects. These two classes of compounds are formed as the result of oxidative insults; for this reason, they can be useful oxidative stress biomarkers. The present study examines the variation of AGEs and HSAox in hemodialysis (HD) patients before and after dialysis session, evaluating the impact of different dialytic techniques and filters on their removal. METHODS A total of 50 healthy subjects (control group) and 130 HD patients were enrolled in the study. Hemodialysis patients were subdivided based on dialytic techniques: 109 in diffusive technique and 22 in convective technique. We monitored HSAox, AGEs and other laboratory parameters at early morning in healthy subjects and in HD patients before and after the dialysis procedures. RESULTS The level of HSAox decreases after a single dialytic session (from 58.5 ± 8.8% to 41.5 ± 11.1%), but the concentration of total AGEs increases regardless of adopted dialytic techniques (from 6.8 ± 5.2 µg/ml to 9.2 ± 4.4 µg/ml). In our study, levels of HSAox and total AGEs are similar in diabetic and non-diabetic HD patients. The increase in total AGEs after dialysis was only observed using polysulfone filters but was absent with polymethacrylate filters. CONCLUSIONS HSAox is a simple and immediate method to verify the beneficial effect of a single dialysis session on the redox imbalance, always present in HD patients. Total AGEs assayed by ELISA procedure seem to be a less reliable biomarker in this population.
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Affiliation(s)
- Annalisa Noce
- UOC of Internal Medicine-Center of Hypertension and Nephrology Unit, Department of Systems Medicine, University of Rome Tor Vergata, 00133, Rome, Italy.
| | - Valentina Rovella
- UOC of Internal Medicine-Center of Hypertension and Nephrology Unit, Department of Systems Medicine, University of Rome Tor Vergata, 00133, Rome, Italy.
| | - Giulia Marrone
- UOC of Internal Medicine-Center of Hypertension and Nephrology Unit, Department of Systems Medicine, University of Rome Tor Vergata, 00133, Rome, Italy
- PhD School of Applied Medical-Surgical Sciences, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Giada Cattani
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Viviana Zingaretti
- Department of Clinical Medicine-Nephrology Unit, University of Rome Sapienza, 00185, Rome, Italy
| | - Dolores Limongi
- IRCCS San Raffaele Pisana, Department of Human Sciences and Promotion of the Quality of Life, Open University San Raffaele Roma, 00163, Rome, Italy
| | - Cartesio D'Agostini
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133, Rome, Italy
- Laboratory of Clinical Microbiology, Policlinico Tor Vergata, 00133, Rome, Italy
| | - Roberto Sorge
- Laboratory of Biometry, Department of Systems Medicine, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Maurizio Casasco
- Federazione Medico Sportiva Italiana, Palazzo delle Federazioni Sportive Nazionali, 00196, Rome, Italy
| | - Nicola Di Daniele
- UOC of Internal Medicine-Center of Hypertension and Nephrology Unit, Department of Systems Medicine, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Giorgio Ricci
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Alessio Bocedi
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
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Wangeline MA, Hampton RY. "Mallostery"-ligand-dependent protein misfolding enables physiological regulation by ERAD. J Biol Chem 2018; 293:14937-14950. [PMID: 30018140 DOI: 10.1074/jbc.ra118.001808] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 06/06/2018] [Indexed: 12/19/2022] Open
Abstract
HMG-CoA reductase (HMGR) undergoes regulated degradation as part of feedback control of the sterol pathway. In yeast, the stability of the HMGR isozyme Hmg2 is controlled by the 20-carbon isoprenoid geranylgeranyl pyrophosphate (GGPP). Increasing GGPP levels cause more efficient degradation by the HMG-CoA reductase degradation (HRD) pathway, allowing for feedback regulation of HMGR. The HRD pathway is critical for the endoplasmic reticulum (ER)-associated degradation (ERAD) of misfolded ER proteins. Here, we have explored GGPP's role in HRD-dependent Hmg2 degradation. We found that GGPP potently regulates Hmg2 levels in vivo and causes reversible Hmg2 misfolding at nanomolar concentrations in vitro These GGPP-mediated effects were absent in several stabilized or nonregulated Hmg2 mutants. Consistent with its high potency, GGPP's effects were highly specific such that other structurally related molecules were ineffective in altering Hmg2 structure. For instance, two closely related GGPP analogues, 2F-GGPP and GGSPP, were completely inactive at all concentrations tested. Furthermore, GGSPP antagonized GGPP's effects in vivo and in vitro Chemical chaperones reversed GGPP's effects on Hmg2 structure and degradation, suggesting that GGPP causes selective Hmg2 misfolding. These results indicate that GGPP functions in a manner similar to an allosteric ligand, causing Hmg2 misfolding through interaction with a reversible, specific binding site. Consistent with this, the Hmg2 protein formed multimers, typical of allosteric proteins. We propose that this "allosteric misfolding," or mallostery, observed here for Hmg2 may be a widely used tactic of biological regulation with potential for development of therapeutic small molecules that induce selective misfolding.
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Affiliation(s)
- Margaret A Wangeline
- From the Division of Biological Sciences, the Section of Cell and Developmental Biology, University of California San Diego, La Jolla, California 92093
| | - Randolph Y Hampton
- From the Division of Biological Sciences, the Section of Cell and Developmental Biology, University of California San Diego, La Jolla, California 92093
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10
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Metalloproteases Affecting Blood Coagulation, Fibrinolysis and Platelet Aggregation from Snake Venoms: Definition and Nomenclature of Interaction Sites. Toxins (Basel) 2016; 8:toxins8100284. [PMID: 27690102 PMCID: PMC5086644 DOI: 10.3390/toxins8100284] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 09/21/2016] [Accepted: 09/22/2016] [Indexed: 01/08/2023] Open
Abstract
Snake venom metalloproteases, in addition to their contribution to the digestion of the prey, affect various physiological functions by cleaving specific proteins. They exhibit their activities through activation of zymogens of coagulation factors, and precursors of integrins or receptors. Based on their structure–function relationships and mechanism of action, we have defined classification and nomenclature of functional sites of proteases. These metalloproteases are useful as research tools and in diagnosis and treatment of various thrombotic and hemostatic conditions. They also contribute to our understanding of molecular details in the activation of specific factors involved in coagulation, platelet aggregation and matrix biology. This review provides a ready reference for metalloproteases that interfere in blood coagulation, fibrinolysis and platelet aggregation.
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11
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Sowole MA, Simpson S, Skovpen YV, Palmer DRJ, Konermann L. Evidence of Allosteric Enzyme Regulation via Changes in Conformational Dynamics: A Hydrogen/Deuterium Exchange Investigation of Dihydrodipicolinate Synthase. Biochemistry 2016; 55:5413-22. [PMID: 27604304 DOI: 10.1021/acs.biochem.6b00764] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Dihydrodipicolinate synthase is a tetrameric enzyme of the diaminopimelate pathway in bacteria and plants. The protein catalyzes the condensation of pyruvate (Pyr) and aspartate semialdehyde en route to the end product lysine (Lys). Dihydrodipicolinate synthase from Campylobacter jejuni (CjDHDPS) is allosterically inhibited by Lys. CjDHDPS is a promising antibiotic target, as highlighted by the recent development of a potent bis-lysine (bisLys) inhibitor. The mechanism whereby Lys and bisLys allosterically inhibit CjDHDPS remains poorly understood. In contrast to the case for other allosteric enzymes, crystallographically detectable conformational changes in CjDHDPS upon inhibitor binding are very minor. Also, it is difficult to envision how Pyr can access the active site; the available X-ray data seemingly imply that each turnover step requires diffusion-based mass transfer through a narrow access channel. This study employs hydrogen/deuterium exchange mass spectrometry for probing the structure and dynamics of CjDHDPS in a native solution environment. The deuteration kinetics reveal that the most dynamic protein regions are in the direct vicinity of the substrate access channel. This finding is consistent with the view that transient opening/closing fluctuations facilitate access of the substrate to the active site. Under saturating conditions, both Lys and bisLys cause dramatically reduced dynamics in the inhibitor binding region. In addition, rigidification extends to regions close to the substrate access channel. This finding strongly suggests that allosteric inhibitors interfere with conformational fluctuations that are required for CjDHDPS substrate turnover. In particular, our data imply that Lys and bisLys suppress opening/closing events of the access channel, thereby impeding diffusion of the substrate into the active site. Overall, this work illustrates why allosteric control does not have to be associated with crystallographically detectable large-scale transitions. Our experiments provide evidence that in CjDHDPS allostery is mediated by changes in the extent of thermally activated conformational fluctuations.
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Affiliation(s)
- Modupeola A Sowole
- Department of Chemistry, The University of Western Ontario , London, Ontario N6A 5B7, Canada
| | - Sarah Simpson
- Department of Chemistry, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Yulia V Skovpen
- Department of Chemistry, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - David R J Palmer
- Department of Chemistry, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Lars Konermann
- Department of Chemistry, The University of Western Ontario , London, Ontario N6A 5B7, Canada
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12
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Allosteric Partial Inhibition of Monomeric Proteases. Sulfated Coumarins Induce Regulation, not just Inhibition, of Thrombin. Sci Rep 2016; 6:24043. [PMID: 27053426 PMCID: PMC4823711 DOI: 10.1038/srep24043] [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: 12/16/2015] [Accepted: 03/14/2016] [Indexed: 11/26/2022] Open
Abstract
Allosteric partial inhibition of soluble, monomeric proteases can offer major regulatory advantages, but remains a concept on paper to date; although it has been routinely documented for receptors and oligomeric proteins. Thrombin, a key protease of the coagulation cascade, displays significant conformational plasticity, which presents an attractive opportunity to discover small molecule probes that induce sub-maximal allosteric inhibition. We synthesized a focused library of some 36 sulfated coumarins to discover two agents that display sub-maximal efficacy (~50%), high potency (<500 nM) and high selectivity for thrombin (>150-fold). Michaelis-Menten, competitive inhibition, and site-directed mutagenesis studies identified exosite 2 as the site of binding for the most potent sulfated coumarin. Stern-Volmer quenching of active site-labeled fluorophore suggested that the allosteric regulators induce intermediate structural changes in the active site as compared to those that display ~80–100% efficacy. Antithrombin inactivation of thrombin was impaired in the presence of the sulfated coumarins suggesting that allosteric partial inhibition arises from catalytic dysfunction of the active site. Overall, sulfated coumarins represent first-in-class, sub-maximal inhibitors of thrombin. The probes establish the concept of allosteric partial inhibition of soluble, monomeric proteins. This concept may lead to a new class of anticoagulants that are completely devoid of bleeding.
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13
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Su H, Qiu W, Kong Q, Mi S, Han Y. Thermostable pectate lyase from Caldicellulosiruptor kronotskyensis provides an efficient addition for plant biomass deconstruction. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcatb.2015.08.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Yang L, He L, Zhang J, An S, Zhang L. Exploring the copper(II)-aminotriazole complex-binding sites of human serum albumin. J Biol Inorg Chem 2015; 20:1059-68. [PMID: 26239697 DOI: 10.1007/s00775-015-1287-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 07/18/2015] [Indexed: 11/25/2022]
Abstract
The potential impact on human exposure to aminotriazole (ATA) and heavy metal in the environment becomes a concerning issue. In the current study, a water-soluble Cu(II)-aminotriazole complex [Cu(II)-ATA] was synthesized. To explore the binding mechanism of the complex with human serum albumin (HSA), their effects on conformation and activity of HSA by multispectroscopic approach and molecular modeling were investigated. Further fluorescent tests revealed that the quenching mechanism of HSA by Cu(II)-ATA was overall static. Meanwhile, the obtained binding constant and thermodynamic parameters on complex-HSA interaction showed that the types of interaction force of Cu(II)-ATA and HSA were hydrogen bonding, van der Waals and electrostatic. The analysis of three-dimensional fluorescence, circular dichroism and Fourier transform infrared spectroscopy showed that Cu(II)-ATA induced the changes in the secondary structure of HSA. Molecular docking simulation was performed and docking model suggested that the complex docked into HSA at subdomain IIA. Furthermore, amino group and attractive electrostatic interaction of Cu(II)-ATA greatly contributed to the hydrogen bonding, van der Waals and electrostatic interaction between Cu(II)-ATA and HSA, as confirmed by experimental data.
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Affiliation(s)
- Lijun Yang
- College of Chemistry, Liaoning University, Shenyang, 110036, People's Republic of China
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15
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Saa P, Nielsen LK. A general framework for thermodynamically consistent parameterization and efficient sampling of enzymatic reactions. PLoS Comput Biol 2015; 11:e1004195. [PMID: 25874556 PMCID: PMC4397067 DOI: 10.1371/journal.pcbi.1004195] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 02/15/2015] [Indexed: 11/19/2022] Open
Abstract
Kinetic models provide the means to understand and predict the dynamic behaviour of enzymes upon different perturbations. Despite their obvious advantages, classical parameterizations require large amounts of data to fit their parameters. Particularly, enzymes displaying complex reaction and regulatory (allosteric) mechanisms require a great number of parameters and are therefore often represented by approximate formulae, thereby facilitating the fitting but ignoring many real kinetic behaviours. Here, we show that full exploration of the plausible kinetic space for any enzyme can be achieved using sampling strategies provided a thermodynamically feasible parameterization is used. To this end, we developed a General Reaction Assembly and Sampling Platform (GRASP) capable of consistently parameterizing and sampling accurate kinetic models using minimal reference data. The former integrates the generalized MWC model and the elementary reaction formalism. By formulating the appropriate thermodynamic constraints, our framework enables parameterization of any oligomeric enzyme kinetics without sacrificing complexity or using simplifying assumptions. This thermodynamically safe parameterization relies on the definition of a reference state upon which feasible parameter sets can be efficiently sampled. Uniform sampling of the kinetics space enabled dissecting enzyme catalysis and revealing the impact of thermodynamics on reaction kinetics. Our analysis distinguished three reaction elasticity regions for common biochemical reactions: a steep linear region (0> ΔGr >-2 kJ/mol), a transition region (-2> ΔGr >-20 kJ/mol) and a constant elasticity region (ΔGr <-20 kJ/mol). We also applied this framework to model more complex kinetic behaviours such as the monomeric cooperativity of the mammalian glucokinase and the ultrasensitive response of the phosphoenolpyruvate carboxylase of Escherichia coli. In both cases, our approach described appropriately not only the kinetic behaviour of these enzymes, but it also provided insights about the particular features underpinning the observed kinetics. Overall, this framework will enable systematic parameterization and sampling of enzymatic reactions.
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Affiliation(s)
- Pedro Saa
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, Australia
| | - Lars K Nielsen
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, Australia
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16
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Yang L, Lv J, Wang X, Zhang J, Li Q, Zhang T, Zhang Z, Zhang L. Direct interactions in the recognition between the environmental estrogen bisphenol AF and human serum albumin. J Mol Recognit 2015; 28:459-66. [DOI: 10.1002/jmr.2463] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Revised: 10/29/2014] [Accepted: 01/14/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Lijun Yang
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Junna Lv
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Xin Wang
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Jing Zhang
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Qi Li
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Tingting Zhang
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Zhenzhen Zhang
- College of Chemistry; Liaoning University; Shenyang 110036 China
| | - Lei Zhang
- College of Chemistry; Liaoning University; Shenyang 110036 China
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17
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Three Sites and You Are Out: Ternary Synergistic Allostery Controls Aromatic Amino Acid Biosynthesis in Mycobacterium tuberculosis. J Mol Biol 2013; 425:1582-92. [DOI: 10.1016/j.jmb.2012.12.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/19/2012] [Accepted: 12/20/2012] [Indexed: 11/19/2022]
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18
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Zsila F. Subdomain IB Is the Third Major Drug Binding Region of Human Serum Albumin: Toward the Three-Sites Model. Mol Pharm 2013; 10:1668-82. [DOI: 10.1021/mp400027q] [Citation(s) in RCA: 233] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ferenc Zsila
- Laboratory of Chemical Pharmacology,
Institute of Molecular
Pharmacology, Research Centre for Natural Sciences, H-1025 Budapest, Pusztaszeri út 59-67, Hungary
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19
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Bocedi A, De Sanctis G, Ciaccio C, Tundo GR, Di Masi A, Fanali G, Nicoletti FP, Fasano M, Smulevich G, Ascenzi P, Coletta M. Reciprocal allosteric modulation of carbon monoxide and warfarin binding to ferrous human serum heme-albumin. PLoS One 2013; 8:e58842. [PMID: 23555601 PMCID: PMC3605432 DOI: 10.1371/journal.pone.0058842] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 02/07/2013] [Indexed: 11/18/2022] Open
Abstract
Human serum albumin (HSA), the most abundant protein in human plasma, could be considered as a prototypic monomeric allosteric protein, since the ligand-dependent conformational adaptability of HSA spreads beyond the immediate proximity of the binding site(s). As a matter of fact, HSA is a major transport protein in the bloodstream and the regulation of the functional allosteric interrelationships between the different binding sites represents a fundamental information for the knowledge of its transport function. Here, kinetics and thermodynamics of the allosteric modulation: (i) of carbon monoxide (CO) binding to ferrous human serum heme-albumin (HSA-heme-Fe(II)) by warfarin (WF), and (ii) of WF binding to HSA-heme-Fe(II) by CO are reported. All data were obtained at pH 7.0 and 25°C. Kinetics of CO and WF binding to the FA1 and FA7 sites of HSA-heme-Fe(II), respectively, follows a multi-exponential behavior (with the same relative percentage for the two ligands). This can be accounted for by the existence of multiple conformations and/or heme-protein axial coordination forms of HSA-heme-Fe(II). The HSA-heme-Fe(II) populations have been characterized by resonance Raman spectroscopy, indicating the coexistence of different species characterized by four-, five- and six-coordination of the heme-Fe atom. As a whole, these results suggest that: (i) upon CO binding a conformational change of HSA-heme-Fe(II) takes place (likely reflecting the displacement of an endogenous ligand by CO), and (ii) CO and/or WF binding brings about a ligand-dependent variation of the HSA-heme-Fe(II) population distribution of the various coordinating species. The detailed thermodynamic and kinetic analysis here reported allows a quantitative description of the mutual allosteric effect of CO and WF binding to HSA-heme-Fe(II).
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Affiliation(s)
- Alessio Bocedi
- Department of Clinical Sciences and Translational Medicine, University of Roma Tor Vergata, Roma, Italy
| | - Giampiero De Sanctis
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Camerino (MC), Italy
| | - Chiara Ciaccio
- Department of Clinical Sciences and Translational Medicine, University of Roma Tor Vergata, Roma, Italy
| | - Grazia R. Tundo
- Department of Clinical Sciences and Translational Medicine, University of Roma Tor Vergata, Roma, Italy
- Interuniversity Consortium for the Research on the Chemistry of Metals in Biological Systems, Bari, Italy
| | - Alessandra Di Masi
- Department of Biology and Interdepartmental Laboratory for Electron Microscopy, University Roma Tre, Roma, Italy
| | - Gabriella Fanali
- Department of Structural and Functional Biology and Center of Neuroscience, University of Insubria, Busto Arsizio (VA), Italy
| | - Francesco P. Nicoletti
- Department of Chemistry “Ugo Schiff”, University of Firenze, Sesto Fiorentino (FI), Italy
| | - Mauro Fasano
- Department of Structural and Functional Biology and Center of Neuroscience, University of Insubria, Busto Arsizio (VA), Italy
| | - Giulietta Smulevich
- Department of Chemistry “Ugo Schiff”, University of Firenze, Sesto Fiorentino (FI), Italy
| | - Paolo Ascenzi
- Department of Biology and Interdepartmental Laboratory for Electron Microscopy, University Roma Tre, Roma, Italy
| | - Massimo Coletta
- Department of Clinical Sciences and Translational Medicine, University of Roma Tor Vergata, Roma, Italy
- Interuniversity Consortium for the Research on the Chemistry of Metals in Biological Systems, Bari, Italy
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20
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Jiao W, Parker EJ. Using a combination of computational and experimental techniques to understand the molecular basis for protein allostery. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2012; 87:391-413. [PMID: 22607762 DOI: 10.1016/b978-0-12-398312-1.00013-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Allostery is the process by which remote sites of a system are energetically coupled to elicit a functional response. The early models of allostery such as the Monod-Wyman-Changeux model and the Koshland-Némethy-Filmer model explain the allosteric behavior of multimeric proteins. However, these models do not explain how allostery arises from atomic level in detail. Recent developments in computational methods and experimental techniques have led the beginning of a new age in studying allostery. The combination of computational methods and experiments is a powerful research approach to help answering questions regarding allosteric mechanism at atomic resolution. In this review, three case studies are discussed to illustrate how this combined approach helps to increase our understanding of protein allostery.
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Affiliation(s)
- Wanting Jiao
- Biomolecular Interaction Centre, Department of Chemistry, University of Canterbury, Christchurch, New Zealand
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21
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Human serum albumin: from bench to bedside. Mol Aspects Med 2011; 33:209-90. [PMID: 22230555 DOI: 10.1016/j.mam.2011.12.002] [Citation(s) in RCA: 1183] [Impact Index Per Article: 91.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Accepted: 12/21/2011] [Indexed: 02/07/2023]
Abstract
Human serum albumin (HSA), the most abundant protein in plasma, is a monomeric multi-domain macromolecule, representing the main determinant of plasma oncotic pressure and the main modulator of fluid distribution between body compartments. HSA displays an extraordinary ligand binding capacity, providing a depot and carrier for many endogenous and exogenous compounds. Indeed, HSA represents the main carrier for fatty acids, affects pharmacokinetics of many drugs, provides the metabolic modification of some ligands, renders potential toxins harmless, accounts for most of the anti-oxidant capacity of human plasma, and displays (pseudo-)enzymatic properties. HSA is a valuable biomarker of many diseases, including cancer, rheumatoid arthritis, ischemia, post-menopausal obesity, severe acute graft-versus-host disease, and diseases that need monitoring of the glycemic control. Moreover, HSA is widely used clinically to treat several diseases, including hypovolemia, shock, burns, surgical blood loss, trauma, hemorrhage, cardiopulmonary bypass, acute respiratory distress syndrome, hemodialysis, acute liver failure, chronic liver disease, nutrition support, resuscitation, and hypoalbuminemia. Recently, biotechnological applications of HSA, including implantable biomaterials, surgical adhesives and sealants, biochromatography, ligand trapping, and fusion proteins, have been reported. Here, genetic, biochemical, biomedical, and biotechnological aspects of HSA are reviewed.
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22
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Ascenzi P, di Masi A, Coletta M, Ciaccio C, Fanali G, Nicoletti FP, Smulevich G, Fasano M. Ibuprofen impairs allosterically peroxynitrite isomerization by ferric human serum heme-albumin. J Biol Chem 2009; 284:31006-17. [PMID: 19734142 DOI: 10.1074/jbc.m109.010736] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Human serum albumin (HSA) participates in heme scavenging; in turn, heme endows HSA with myoglobin-like reactivity and spectroscopic properties. Here, the allosteric effect of ibuprofen on peroxynitrite isomerization to NO(3)(-) catalyzed by ferric human serum heme-albumin (HSA-heme-Fe(III)) is reported. Data were obtained at 22.0 degrees C. HSA-heme-Fe(III) catalyzes peroxynitrite isomerization in the absence and presence of CO(2); the values of the second order catalytic rate constant (k(on)) are 4.1 x 10(5) and 4.5 x 10(5) m(-1) s(-1), respectively. Moreover, HSA-heme-Fe(III) prevents peroxynitrite-mediated nitration of free added l-tyrosine. The pH dependence of k(on) (pK(a) = 6.9) suggests that peroxynitrous acid reacts preferentially with the heme-Fe(III) atom, in the absence and presence of CO(2). The HSA-heme-Fe(III)-catalyzed isomerization of peroxynitrite has been ascribed to the reactive pentacoordinated heme-Fe(III) atom. In the absence and presence of CO(2), ibuprofen impairs dose-dependently peroxynitrite isomerization by HSA-heme-Fe(III) and facilitates the nitration of free added l-tyrosine; the value of the dissociation equilibrium constant for ibuprofen binding to HSA-heme-Fe(III) (L) ranges between 7.7 x 10(-4) and 9.7 x 10(-4) m. Under conditions where [ibuprofen] is >>L, the kinetics of HSA-heme-Fe(III)-catalyzed isomerization of peroxynitrite is superimposable to that obtained in the absence of HSA-heme-Fe(III) or in the presence of non-catalytic HSA-heme-Fe(III)-cyanide complex and HSA. Ibuprofen binding impairs allosterically peroxynitrite isomerization by HSA-heme-Fe(III), inducing the hexacoordination of the heme-Fe(III) atom. These results represent the first evidence for peroxynitrite isomerization by HSA-heme-Fe(III), highlighting the allosteric modulation of HSA-heme-Fe(III) reactivity by heterotropic interaction(s), and outlining the role of drugs in modulating HSA functions. The present results could be relevant for the drug-dependent protective role of HSA-heme-Fe(III) in vivo.
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Affiliation(s)
- Paolo Ascenzi
- Department of Biology and Interdepartmental Laboratory for Electron Microscopy, University Roma Tre, I-00146 Roma, Italy.
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23
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Fanali G, Pariani G, Ascenzi P, Fasano M. Allosteric and binding properties of Asp1-Glu382 truncated recombinant human serum albumin - an optical and NMR spectroscopic investigation. FEBS J 2009; 276:2241-50. [DOI: 10.1111/j.1742-4658.2009.06952.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Ascenzi P, Fasano M. Abacavir modulates peroxynitrite-mediated oxidation of ferrous nitrosylated human serum heme–albumin. Biochem Biophys Res Commun 2007; 353:469-74. [PMID: 17188651 DOI: 10.1016/j.bbrc.2006.12.041] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2006] [Accepted: 12/07/2006] [Indexed: 10/23/2022]
Abstract
Human serum albumin (SA) is best known for its extraordinary ligand-binding capacity. Here, kinetics of peroxynitrite-mediated oxidation of SA-heme(II)-NO is reported. Peroxynitrite reacts with SA-heme(II)-NO leading to SA-heme(III) and ()NO by way of the transient SA-heme(III)-NO species. Abacavir facilitates peroxynitrite-mediated oxidation of SA-heme(II)-NO, in the absence and presence of CO2. Values of the second order rate constant for peroxynitrite-mediated oxidation of SA-heme(II)-NO are (6.5+/-0.9) x 10(3) M(-1) s(-1) in the absence of CO2 and abacavir, (1.3+/-0.2) x 10(5) M(-1) s(-1) in the presence of CO2, (2.2+/-0.2) x 10(4) M(-1) s(-1) in the presence of abacavir, and (3.6+/-0.3) x 10(5) M(-1) s(-1) in the presence of both CO2 and abacavir. The value of the first-order rate constant for *NO dissociation from the SA-heme(III)-NO complex (=(1.8+/-0.3) x 10(-1) s(-1)) is CO2- and abacavir-independent, representing the rate-limiting step. Present data represent the first evidence for the allosteric modulation of SA-heme reactivity by heterotropic interaction(s).
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Affiliation(s)
- Paolo Ascenzi
- Department of Biology, University Roma Tre, Viale Guglielmo Marconi 446, I-00146 Roma, Italy.
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25
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Fasano M, Curry S, Terreno E, Galliano M, Fanali G, Narciso P, Notari S, Ascenzi P. The extraordinary ligand binding properties of human serum albumin. IUBMB Life 2006; 57:787-96. [PMID: 16393781 DOI: 10.1080/15216540500404093] [Citation(s) in RCA: 775] [Impact Index Per Article: 43.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Human serum albumin (HSA), the most prominent protein in plasma, binds different classes of ligands at multiple sites. HSA provides a depot for many compounds, affects pharmacokinetics of many drugs, holds some ligands in a strained orientation providing their metabolic modification, renders potential toxins harmless transporting them to disposal sites, accounts for most of the antioxidant capacity of human serum, and acts as a NO-carrier. The globular domain structural organization of monomeric HSA is at the root of its allosteric properties which are reminiscent of those of multimeric proteins. Here, structural, functional, biotechnological, and biomedical aspects of ligand binding to HSA are summarized.
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Affiliation(s)
- Mauro Fasano
- Department of Structural and Functional Biology, University of Insubria, Center of Neurosciences, 21052 Busto Arsizio, Italy
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26
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Ascenzi P, Bocedi A, Visca P, Altruda F, Tolosano E, Beringhelli T, Fasano M. Hemoglobin and heme scavenging. IUBMB Life 2006; 57:749-59. [PMID: 16511968 DOI: 10.1080/15216540500380871] [Citation(s) in RCA: 198] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Release of hemoglobin into plasma is a physiological phenomenon associated with intravascular hemolysis. In plasma, stable haptoglobin-hemoglobin complexes are formed and these are subsequently delivered to the reticulo-endothelial system by CD163 receptor-mediated endocytosis. Heme arising from the degradation of hemoglobin, myoglobin, and of enzymes with heme prosthetic groups could be delivered in plasma. Albumin, haptoglobin, hemopexin, and high and low density lipoproteins cooperate to trap the plasma heme, thereby ensuring its complete clearance. Then hemopexin releases the heme into hepatic parenchymal cells only after internalization of the hemopexin-heme complex by CD91 receptor-mediated endocytosis. Moreover, alpha1-microglobulin contributes to heme degradation by a still unknown mechanism, with the concomitant formation of heterogeneous yellow-brown kynurenine-derived chromophores which are very tightly bound to amino acid residues close to the rim of the lipocalin pocket. During hemoglobin synthesis, the erythroid alpha-chain hemoglobin-stabilizing protein specifically binds free alpha-hemoglobin subunits limiting the free protein toxicity. Although highly toxic because capable of catalyzing free radical formation, heme is also a major and readily available source of iron for pathogenic organisms. Gram-negative bacteria pick up the heme-bound iron through the secretion of a hemophore that takes up either free heme or heme bound to heme-proteins and transports it to a specific receptor, which, in turn, releases the heme and hence iron into the bacterium. Here, hemoglobin and heme trapping mechanisms are summarized.
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Affiliation(s)
- Paolo Ascenzi
- National Institute for Infectious Diseases IRCCS 'Lazzaro Spallanzani', Roma, Italy.
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Bocedi A, Notari S, Menegatti E, Fanali G, Fasano M, Ascenzi P. Allosteric modulation of anti-HIV drug and ferric heme binding to human serum albumin. FEBS J 2006; 272:6287-96. [PMID: 16336266 DOI: 10.1111/j.1742-4658.2005.05015.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Human serum albumin (HSA), the most prominent protein in plasma, is best known for its exceptional capacity to bind ligands (e.g. heme and drugs). Here, binding of the anti-HIV drugs abacavir, atazanavir, didanosine, efavirenz, emtricitabine, lamivudine, nelfinavir, nevirapine, ritonavir, saquinavir, stavudine, and zidovudine to HSA and ferric heme-HSA is reported. Ferric heme binding to HSA in the absence and presence of anti-HIV drugs was also investigated. The association equilibrium constant and second-order rate constant for the binding of anti-HIV drugs to Sudlow's site I of ferric heme-HSA are lower by one order of magnitude than those for the binding of anti-HIV drugs to HSA. Accordingly, the association equilibrium constant and the second-order rate constant for heme binding to HSA are decreased by one order of magnitude in the presence of anti-HIV drugs. In contrast, the first-order rate constant for ligand dissociation from HSA is insensitive to anti-HIV drugs and ferric heme. These findings represent clear-cut evidence for the allosteric inhibition of anti-HIV drug binding to HSA by the heme. In turn, anti-HIV drugs allosterically impair heme binding to HSA. Therefore, Sudlow's site I and the heme cleft must be functionally linked.
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Affiliation(s)
- Alessio Bocedi
- National Institute for Infectious Diseases I.R.C.C.S. Lazzaro Spallanzani, Roma, Italy
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28
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Fanali G, Fesce R, Agrati C, Ascenzi P, Fasano M. Allosteric modulation of myristate and Mn(III)heme binding to human serum albumin. Optical and NMR spectroscopy characterization. FEBS J 2005; 272:4672-83. [PMID: 16156788 DOI: 10.1111/j.1742-4658.2005.04883.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Human serum albumin (HSA) is best known for its extraordinary ligand binding capacity. HSA has a high affinity for heme and is responsible for the transport of medium and long chain fatty acids. Here, we report myristate binding to the N and B conformational states of Mn(III)heme-HSA (i.e. at pH 7.0 and 10.0, respectively) as investigated by optical absorbance and NMR spectroscopy. At pH 7.0, Mn(III)heme binds to HSA with lower affinity than Fe(III)heme, and displays a water molecule coordinated to the metal. Myristate binding to a secondary site FAx, allosterically coupled to the heme site, not only increases optical absorbance of Mn(III)heme-bound HSA by a factor of approximately three, but also increases the Mn(III)heme affinity for the fatty acid binding site FA1 by 10-500-fold. Cooperative binding appears to occur at FAx and accessory myristate binding sites. The conformational changes of the Mn(III)heme-HSA tertiary structure allosterically induced by myristate are associated with a noticeable change in both optical absorbance and NMR spectroscopic properties of Mn(III)heme-HSA, allowing the Mn(III)-coordinated water molecule to exchange with the solvent bulk. At pH = 10.0 both myristate affinity for FAx and allosteric modulation of FA1 are reduced, whereas cooperation of accessory sites and FAx is almost unaffected. Moreover, Mn(III)heme binds to HSA with higher affinity than at pH 7.0 even in the absence of myristate, and the metal-coordinated water molecule is displaced. As a whole, these results suggest that FA binding promotes conformational changes reminiscent of N to B state HSA transition, and appear of general significance for a deeper understanding of the allosteric modulation of ligand binding properties of HSA.
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Affiliation(s)
- Gabriella Fanali
- Dipartimento di Biologia Strutturale e Funzionale, and Centro di Neuroscienze, Università dell'Insubria, Busto Arsizio (VA), Italy
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Ascenzi P, Bocedi A, Notari S, Menegatti E, Fasano M. Heme impairs allosterically drug binding to human serum albumin Sudlow’s site I. Biochem Biophys Res Commun 2005; 334:481-6. [PMID: 16004963 DOI: 10.1016/j.bbrc.2005.06.127] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2005] [Accepted: 06/20/2005] [Indexed: 11/16/2022]
Abstract
Human serum albumin (HSA), the most prominent protein in plasma, is best known for its exceptional ligand (e.g., heme and drugs) binding capacity. Here, the binding of chlorpropamide, digitoxin, furosemide, indomethacin, phenylbutazone, sulfisoxazole, and tolbutamide to HSA and ferric heme-HSA is reported. Moreover, ferric heme binding to HSA in the absence and presence of drugs has been investigated. Values of the association equilibrium constant for drug binding to Sudlow's site I of ferric heme-HSA (ranging between 1.7 x 10(3) and 1.6 x 10(5)M(-1)) are lower by one order of magnitude than those for drug binding to ferric heme-free HSA (ranging between 1.9 x 10(4) and 1.8 x 10(6)M(-1)). According to linked functions, the value of the association equilibrium constant for heme binding to HSA decreases from 7.8 x 10(7)M(-1), in the absence of drugs to 7.0 x 10(6)M(-1), in the presence of drugs. These findings represent a clear-cut evidence for the allosteric inhibition of drug binding to HSA Sudlow's site I by the heme. According to linked functions, drugs impair allosterically heme binding to HSA. These results appear to be relevant in the drug therapy and management.
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Affiliation(s)
- Paolo Ascenzi
- National Institute for Infectious Diseases I.R.C.C.S. Lazzaro Spallanzani, Via Portuense 292, I-00149 Roma, Italy.
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