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Tárraga WA, Falomir-Lockhart LJ, Garda HA, González MC. Analysis of pyrene-labelled apolipoprotein A-I oligomerization in solution: Spectra deconvolution and changes in P-value and excimer formation. Arch Biochem Biophys 2021; 699:108748. [PMID: 33444627 DOI: 10.1016/j.abb.2020.108748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/22/2020] [Accepted: 12/28/2020] [Indexed: 11/15/2022]
Abstract
ApoA-I is the main protein of HDL which has anti-atherogenic properties attributed to reverse cholesterol transport. It shares with other exchangeable apolipoproteins a high level of structural plasticity. In the lipid-free state, the apolipoprotein amphipathic α-helices interact intra- and inter-molecularly, providing structural stabilization by a complex self-association mechanism. In this study, we employed a multi-parametric fluorescent probe to study the self-association of apoA-I. We constructed six single cysteine mutants spanning positions along three helices: F104C, K107C (H4), K133C, L137C (H5), F225C and K226C (H10); and labelled them with N-Maleimide Pyrene. Taking advantage of its spectral properties, namely formation of an excited dimer (excimer) and polarity-dependent changes in its fluorescence fine structure (P-value), we monitored the apoA-I self-association in its lipid-free form as a function of its concentration. Interactions in helices H5 (K133C) and H10 (F225C and K226C) were highlighted by excimer emission; while polarity changes were reported in helix H4 (K107C), as well as in helices H5 and H10. Mathematical models were developed to enrich data analysis and estimate association constants (KA) and oligomeric species distribution. Furthermore, we briefly discuss the usefulness of the multi-parametric fluorescent probe to monitor different equilibria, even at a single labelling position. Results suggest that apoA-I self-association must be considered to fully understand its physiological roles. Particularly, some contacts that stabilize discoidal HDL particles seem to be already present in the lipid-free apoA-I oligomers.
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Affiliation(s)
- Wilson A Tárraga
- Instituto de Investigaciones Bioquímica de La Plata (INIBIOLP), Centro Científico Tecnológico-La Plata, Calle 60 y 120 s/n, 1900, La Plata, Argentina.
| | - Lisandro J Falomir-Lockhart
- Instituto de Investigaciones Bioquímica de La Plata (INIBIOLP), Centro Científico Tecnológico-La Plata, Calle 60 y 120 s/n, 1900, La Plata, Argentina; Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 47 y 115 s/n, 1900, La Plata, Argentina.
| | - Horacio A Garda
- Instituto de Investigaciones Bioquímica de La Plata (INIBIOLP), Centro Científico Tecnológico-La Plata, Calle 60 y 120 s/n, 1900, La Plata, Argentina; Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120 s/n, 1900, La Plata, Argentina.
| | - Marina C González
- Instituto de Investigaciones Bioquímica de La Plata (INIBIOLP), Centro Científico Tecnológico-La Plata, Calle 60 y 120 s/n, 1900, La Plata, Argentina; Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calle 60 y 120 s/n, 1900, La Plata, Argentina.
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Padro D, Cienskowski P, Lopez-Fernandez S, Chakraborty I, Carrillo-Carrion C, Feliu N, Parak WJ, Carril M. Toward Diffusion Measurements of Colloidal Nanoparticles in Biological Environments by Nuclear Magnetic Resonance. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2001160. [PMID: 32431081 DOI: 10.1002/smll.202001160] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 06/11/2023]
Abstract
Protein corona formation on the surface of nanoparticles (NPs) is observed in situ by measuring diffusion coefficients of the NPs under the presence of proteins with a 19 F nuclear magnetic resonance (NMR) based methodology. Formation of a protein corona reduces the diffusion coefficient of the NPs, based on an increase in their effective hydrodynamic radii. With this methodology it is demonstrated that the apparent dissociation constant of protein-NP complexes may vary over at least nine orders of magnitude for different types of proteins, in line with the Vroman effect. Using this methodology, the interaction between one type of protein and one type of nanoparticle can be studied quantitatively. Due to the NMR-based detection, this methodology has no interference by absorption/scattering effects, by which optical detection schemes are affected. By using the potential of the NMR chemical shift, the detection of multiple 19 F signals simultaneously opens the possibility to study the diffusion of several NPs at the same time. The 19 F labeling of the NPs has negligible effect on their acute toxicity and moderate effect on NPs uptake by cells.
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Affiliation(s)
- Daniel Padro
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, Donostia-San Sebastián, 20014, Spain
| | | | - Sonia Lopez-Fernandez
- Fundación Biofísica Bizkaia/Biofisika Bizkaia Fundazioa (FBB), Leioa, E-48940, Spain
- Instituto Biofisika UPV/EHU, CSIC, Barrio Sarriena s/n, Leioa, Bizkaia, E-48940, Spain
| | | | - Carolina Carrillo-Carrion
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, Donostia-San Sebastián, 20014, Spain
| | - Neus Feliu
- Center for Hybrid Nanostructures, University of Hamburg, Hamburg, 20146, Germany
| | - Wolfgang J Parak
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, Donostia-San Sebastián, 20014, Spain
- Center for Hybrid Nanostructures, University of Hamburg, Hamburg, 20146, Germany
| | - Monica Carril
- Instituto Biofisika UPV/EHU, CSIC, Barrio Sarriena s/n, Leioa, Bizkaia, E-48940, Spain
- Departamento de Bioquímica y Biología Molecular, UPV/EHU, Barrio Sarriena s/n, Leioa, Bizkaia, E-48940, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, 48013, Spain
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Eckhardt D, Li-Blatter X, Schönfeld HJ, Heerklotz H, Seelig J. Cooperative unfolding of apolipoprotein A-1 induced by chemical denaturation. Biophys Chem 2018; 240:42-49. [DOI: 10.1016/j.bpc.2018.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 05/22/2018] [Accepted: 05/22/2018] [Indexed: 12/30/2022]
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Collier TS, Jin Z, Topbas C, Bystrom C. Rapid Affinity Enrichment of Human Apolipoprotein A-I Associated Lipoproteins for Proteome Analysis. J Proteome Res 2018; 17:1183-1193. [PMID: 29411613 DOI: 10.1021/acs.jproteome.7b00816] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Isolation of high density lipoproteins (HDL) for structural and functional studies typically relies on ultracentrifugation techniques, which are time-consuming and difficult to scale. With emerging interest in the clinical relevance of HDL structure and function to cardiovascular disease, a significant gap exists between current and desirable sample preparation throughput. To enable proteomic studies of HDL with large clinical cohorts, we have developed an affinity enrichment approach that relies on the association of histidine-tagged, lipid free ApoA-I with HDL followed by standard metal chelate chromatography. Characterization of the resulting affinity-enriched ApoA-I associated lipoprotein (AALP) pool using biochemical, electrophoretic, and proteomic analysis demonstrates that the isolated material is closely related in structural features, lipid content, protein complement, and relative protein distribution to HDL isolated by ultracentrifugation using sequential density adjustment. The simplicity of the method provides avenues for high-throughput analysis of HDL associated proteins.
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Affiliation(s)
- Timothy S Collier
- Cleveland HeartLab, Inc. 6701 Carnegie Avenue, Suite 500 Cleveland, Ohio 44103, United States
| | - Zhicheng Jin
- Cleveland HeartLab, Inc. 6701 Carnegie Avenue, Suite 500 Cleveland, Ohio 44103, United States
| | - Celalettin Topbas
- Cleveland HeartLab, Inc. 6701 Carnegie Avenue, Suite 500 Cleveland, Ohio 44103, United States
| | - Cory Bystrom
- Cleveland HeartLab, Inc. 6701 Carnegie Avenue, Suite 500 Cleveland, Ohio 44103, United States
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Efficient purification of Apolipoprotein A1 (ApoA1) from plasma by HEA HyperCel™: An alternative approach. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1073:104-109. [DOI: 10.1016/j.jchromb.2017.12.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/01/2017] [Accepted: 12/10/2017] [Indexed: 11/22/2022]
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Raghavendra AJ, Alsaleh N, Brown JM, Podila R. Charge-transfer interactions induce surface dependent conformational changes in apolipoprotein biocorona. Biointerphases 2017; 12:02D402. [PMID: 28269991 PMCID: PMC5346100 DOI: 10.1116/1.4977064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 01/18/2017] [Accepted: 02/09/2017] [Indexed: 12/12/2022] Open
Abstract
Upon introduction into a biological system, engineered nanomaterials (ENMs) rapidly associate with a variety of biomolecules such as proteins and lipids to form a biocorona. The presence of "biocorona" influences nano-bio interactions considerably, and could ultimately result in altered biological responses. Apolipoprotein A-I (ApoA-I), the major constituent of high-density lipoprotein (HDL), is one of the most prevalent proteins found in ENM-biocorona irrespective of ENM nature, size, and shape. Given the importance of ApoA-I in HDL and cholesterol transport, it is necessary to understand the mechanisms of ApoA-I adsorption and the associated structural changes for assessing consequences of ENM exposure. Here, the authors used a comprehensive array of microscopic and spectroscopic tools to elucidate the interactions between ApoA-I and 100 nm Ag nanoparticles (AgNPs) with four different surface functional groups. The authors found that the protein adsorption and secondary structural changes are highly dependent on the surface functionality. Our electrochemical studies provided new evidence for charge transfer interactions that influence ApoA-I unfolding. While the unfolding of ApoA-I on AgNPs did not significantly change their uptake and short-term cytotoxicity, the authors observed that it strongly altered the ability of only some AgNPs to generate of reactive oxygen species. Our results shed new light on the importance of surface functionality and charge transfer interactions in biocorona formation.
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Affiliation(s)
- Achyut J Raghavendra
- Laboratory of Nano-Biophysics, Clemson Nanomaterials Center, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634
| | - Nasser Alsaleh
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Science, University of Colorado-Anschutz Medical Campus, Aurora, Colorado 80045
| | - Jared M Brown
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Science, University of Colorado-Anschutz Medical Campus, Aurora, Colorado 80045
| | - Ramakrishna Podila
- Laboratory of Nano-Biophysics, Clemson Nanomaterials Center, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634 and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson, South Carolina 29625
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