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Initial biophysical characterization of Amynthas gracilis giant extracellular hemoglobin (HbAg). EUROPEAN BIOPHYSICS JOURNAL: EBJ 2020; 49:473-484. [PMID: 32813035 DOI: 10.1007/s00249-020-01455-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 08/01/2020] [Accepted: 08/11/2020] [Indexed: 10/23/2022]
Abstract
The aim of the present work was the biophysical characterization of the Amynthas gracilis hemoglobin (HbAg). The oxy-HbAg optical absorption data, with Soret and Q bands centered at 415, 540 and 575 nm, were stable and unchanged at pH 7.0. An increase in pH promotes decrease in the intensity in the optical absorption bands, suggesting an oligomeric dissociation and partial oxidation. Identical stability at pH 7.0 was observed in DLS results that presented a hydrodynamic diameter of 28 nm, characteristic of the whole oligomer. DLS shows that HbAg undergoes oligomeric dissociation and an aggregation/denaturation process that corroborates spectroscopic data. Our results showed that the monomer d presents four isoforms with molecular mass (MM) ranging from 16,244 to 16,855 Da; the trimer subunit presents two isoforms, (abc)1 and (abc)2, with MM of 51,415 ± 20 Da and 51,610 ± 14 Da, respectively, and a less intense species, at 67,793 Da, assigned to the tetramer abcd. Monomeric chains a, obtained from reduction of the disulfide-bonded trimer abc, present four isoforms with MM 17,015 Da, 17,061 Da, 17,138 Da and 17,259 Da. DLS and LSI revealed an isoeletric point (pI) of oxy-HbAg of 6.0 ± 0.3 and 5.5, respectively. Data analysis by IEF-SDS-PAGE revealed that the pI of oxy-HbAg is 6.11, correlating with DLS and LSI data. These studies indicate that oxy-HbAg is very stable, at pH 7.0, and has differing properties from orthologous giant hemoglobins.
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Carvalho FAO, Caruso CS, Nascimento ED, Oliveira TMBF, Bachega JFR, Tabak M. Oligomeric stability of Glossoscolex paulistus hemoglobin as a function of the storage time. Int J Biol Macromol 2019; 133:30-36. [PMID: 30986471 DOI: 10.1016/j.ijbiomac.2019.04.072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 04/11/2019] [Accepted: 04/11/2019] [Indexed: 11/16/2022]
Abstract
Glossoscolex paulistus hemoglobin structure is composed of 144 globin chains and 36 polypeptide chains lacking the heme group, with a total molecular mass of 3600 kDa. The current study focuses on the oxy-HbGp oligomeric stability, as a function of the storage time, at pH 7.0, using dynamic light scattering, analytical ultracentrifugation (AUC), optical absorption and size exclusion chromatography (SEC). HbGp stored in Tris-HCl buffer, pH 7.0, at 4 °C, for two years remains in the native form, while 4-6 years HbGp stocks present typical hemichrome species absorption spectra. AUC and SEC analyses show that the contribution of HbGp-subunits, such as, dodecamer (abcd)3, tetramer abcd, trimer abc and monomer d, increases with the protein aging due to the lower stability of the HbGp with the time. The dissociation and the oxidation of the iron noted for the older protein solutions indicate that HbGp storage for periods of time longer than two years changes its ability to carry oxygen. Despite the reduction of HbGp stability and oxygen carrying capacity with aging, the protein stability is still larger as compared to mammalian hemoglobins. Thus, the extracellular hemoglobins are quite stable and resistant to the auto-oxidation process, making them of interest for biotechnological applications.
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Affiliation(s)
| | - Celia S Caruso
- Instituto de Química de São Carlos - Universidade de São Paulo, Brazil
| | - Evair D Nascimento
- Instituto de Ciências Exatas - Universidade Federal do Sul e Sudeste do Pará, Brazil
| | - Thiago Mielle B F Oliveira
- Centro de Ciência e Tecnologia, Universidade Federal do Cariri, Av. Tenente Raimundo Rocha, Cidade Universitária, 63048-080 Juazeiro do Norte, CE, Brazil
| | - José F R Bachega
- Universidade Federal de Ciências da Saúde de Porto Alegre - UFCSPA, Brazil
| | - Marcel Tabak
- Instituto de Química de São Carlos - Universidade de São Paulo, Brazil
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Caruso CS, Biazin E, Carvalho FA, Tabak M, Bachega JF. Metals content of Glossoscolex paulistus extracellular hemoglobin: Its peroxidase activity and the importance of these ions in the protein stability. J Inorg Biochem 2016; 161:63-72. [DOI: 10.1016/j.jinorgbio.2016.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 04/08/2016] [Accepted: 05/04/2016] [Indexed: 10/21/2022]
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Carvalho FAO, Alves FR, Tabak M. Ionic surfactants-Glossoscolex paulistus hemoglobin interactions: Characterization of species in the solution. Int J Biol Macromol 2016; 92:670-681. [PMID: 27456123 DOI: 10.1016/j.ijbiomac.2016.07.072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 07/18/2016] [Accepted: 07/21/2016] [Indexed: 12/18/2022]
Abstract
Glossoscolex paulistus hemoglobin (HbGp) is an oligomeric multisubunit protein with molecular mass of 3600kDa. In the current study, the interaction of sodium dodecyl sulfate (SDS) and cetyl trimethylammonium chloride (CTAC) surfactants with the monomer d and the whole oxy-HbGp, at pH 7.0, was investigated. For pure monomer d solution, SDS promotes the dimerization of subunit d, and the monomeric and dimeric forms have sedimentation coefficient values, s20,w, around 2.1-2.4 S and 2.9-3.2 S, respectively. Analytical ultracentrifugation (AUC) and isothermal titration calorimetry (ITC) data suggest that up to 26 DS- anions are bound to the monomer. In the presence of CTAC, only the monomeric form is observed in solution for subunit d. For the oxy-HbGp, SDS induces the dissociation into smaller subunits, such as, monomer d, trimer abc, and tetramer abcd, and unfolding without promoting the protein aggregation. On the other hand, lower CTAC concentration promotes protein aggregation, mainly of trimer, while higher concentration induces the unfolding of dissociated species. Our study provides strong evidence that surfactant effects upon the HbGp-subunits are different, and depend on the surfactant: protein concentration ratio and the charges of surfactant headgroups.
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Affiliation(s)
- Francisco A O Carvalho
- Instituto de Química de São Carlos, Universidade de São Paulo, Brazil; Faculdade de Química, Universidade Federal do Sul e Sudeste do Pará, Brazil.
| | - Fernanda R Alves
- Instituto de Química de São Carlos, Universidade de São Paulo, Brazil
| | - Marcel Tabak
- Instituto de Química de São Carlos, Universidade de São Paulo, Brazil
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Alves FR, Carvalho FAO, Carvalho JWP, Tabak M. Interaction of cationic dodecyl-trimethyl-ammonium bromide with oxy-HbGp by isothermal titration and differential scanning calorimetric studies: Effect of proximity of isoelectric point. Biopolymers 2015; 105:199-211. [PMID: 26574155 DOI: 10.1002/bip.22777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 11/03/2015] [Accepted: 11/04/2015] [Indexed: 11/10/2022]
Abstract
In this work, isothermal titration and differential scanning calorimetric methods, in combination with pyrene fluorescence emission and dynamic light scattering have been used to investigate the interaction of dodecyltrimethylammonium bromide (DTAB) with the giant extracellular Glossoscolex paulistus hemoglobin (HbGp) in the oxy-form, at pH values around the isoelectric point (pI ≈ 5.5). Our ITC results have shown that the interaction of DTAB with the hemoglobin is more intense at pH 7.0, with a smaller cac (critical aggregation concentration) value. The increase of protein concentration does not influence the cac value of the interaction, at both pH values. Therefore, the beginning of the DTAB-oxy-HbGp premicellar aggregates formation, in the cac region, is not affected by the increase of protein concentration. HSDSC studies show higher Tm values at pH 5.0, in the absence and presence of DTAB, when compared with pH 7.0. Furthermore, at pH 7.0, an aggregation process is observed with DTAB in the range from 0.75 to 1.5 mmol/L, noticed by the exothermic peak, and similar to that observed for pure oxy-HbGp, at pH 5.0, and in the presence of DTAB. DLS melting curves show a decrease on the hemoglobin thermal stability for the oxy-HbGp-DTAB mixtures and formation of larger aggregates, at pH 7.0. Our present data, together with previous results, support the observation that the protein structural changes, at pH 7.0, occur at smaller DTAB concentrations, as compared with pH 5.0, due to the acidic pI of protein that favors the oxy-HbGp-cationic surfactant interaction at neutral pH.
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Affiliation(s)
- Fernanda Rosa Alves
- Instituto De Química De São Carlos, Universidade De São Paulo, São Carlos, SP, Brazil
| | | | | | - Marcel Tabak
- Instituto De Química De São Carlos, Universidade De São Paulo, São Carlos, SP, Brazil
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Ruggiero Bachega JF, Vasconcelos Maluf F, Andi B, D'Muniz Pereira H, Falsarella Carazzollea M, Orville AM, Tabak M, Brandão-Neto J, Garratt RC, Horjales Reboredo E. The structure of the giant haemoglobin from Glossoscolex paulistus. ACTA ACUST UNITED AC 2015; 71:1257-71. [PMID: 26057666 DOI: 10.1107/s1399004715005453] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 03/16/2015] [Indexed: 11/10/2022]
Abstract
The sequences of all seven polypeptide chains from the giant haemoglobin of the free-living earthworm Glossoscolex paulistus (HbGp) are reported together with the three-dimensional structure of the 3.6 MDa complex which they form. The refinement of the full particle, which has been solved at 3.2 Å resolution, the highest resolution reported to date for a hexagonal bilayer haemoglobin composed of 12 protomers, is reported. This has allowed a more detailed description of the contacts between subunits which are essential for particle stability. Interpretation of features in the electron-density maps suggests the presence of metal-binding sites (probably Zn(2+) and Ca(2+)) and glycosylation sites, some of which have not been reported previously. The former appear to be important for the integrity of the particle. The crystal structure of the isolated d chain (d-HbGp) at 2.1 Å resolution shows different interchain contacts between d monomers compared with those observed in the full particle. Instead of forming trimers, as seen in the complex, the isolated d chains associate to form dimers across a crystallographic twofold axis. These observations eliminate the possibility that trimers form spontaneously in solution as intermediates during the formation of the dodecameric globin cap and contribute to understanding of the possible ways in which the particle self-assembles.
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Affiliation(s)
| | | | - Babak Andi
- Photon Sciences Directorate, Brookhaven National Laboratory, Upton, New York, USA
| | | | - Marcelo Falsarella Carazzollea
- Laboratório de Genômica e Expressão, Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
| | - Allen M Orville
- Photon Sciences Directorate, Brookhaven National Laboratory, Upton, New York, USA
| | - Marcel Tabak
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, Brazil
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Barros AE, Carvalho FA, Alves FR, Carvalho JW, Tabak M. Denaturant effects on HbGp hemoglobin as monitored by 8-anilino-1-naphtalene-sulfonic acid (ANS) probe. Int J Biol Macromol 2015; 74:327-36. [DOI: 10.1016/j.ijbiomac.2014.12.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 10/24/2022]
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Alves FR, Carvalho FAO, Carvalho JWP, Tabak M. Glossoscolex paulistus extracellular hemoglobin (HbGp) oligomeric dissociation upon interaction with sodium dodecyl sulfate: Isothermal titration calorimetry (ITC). Biopolymers 2014; 101:1065-76. [DOI: 10.1002/bip.22506] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 05/06/2014] [Accepted: 05/13/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Fernanda Rosa Alves
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
| | - Francisco Adriano O. Carvalho
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
| | - José Wilson P. Carvalho
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
- Universidade do Estado de Mato Grosso; Campus Rene Barbour; Barra do Bugres MT Brazil
| | - Marcel Tabak
- Instituto de Química de São Carlos; Departamento de Química e Física Molecular, Universidade de São Paulo, São Carlos, SP; Brazil
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Carvalho JWP, Carvalho FAO, Batista T, Santiago PS, Tabak M. Cetyltrimethylammonium chloride (CTAC) effect on the thermal stability of oxy-HbGp: Dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) studies. Colloids Surf B Biointerfaces 2014; 118:14-24. [DOI: 10.1016/j.colsurfb.2014.03.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 03/05/2014] [Accepted: 03/12/2014] [Indexed: 01/27/2023]
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Wang Q, Hu T, Sun L, Ji S, Zhao D, Liu J, Ma G, Su Z. CO binding improves the structural, functional, physical and anti-oxidation properties of the PEGylated hemoglobin. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2014; 43:18-25. [DOI: 10.3109/21691401.2014.885444] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Characterization of Rhinodrilus alatus hemoglobin (HbRa) and its subunits: Evidence for strong interaction with cationic surfactants DTAB and CTAC. Comp Biochem Physiol B Biochem Mol Biol 2014; 167:23-9. [DOI: 10.1016/j.cbpb.2013.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 09/23/2013] [Accepted: 09/23/2013] [Indexed: 11/15/2022]
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12
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Sodium dodecyl sulfate (SDS) effect on the thermal stability of oxy-HbGp: Dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) studies. Colloids Surf B Biointerfaces 2013; 111:561-70. [DOI: 10.1016/j.colsurfb.2013.06.050] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 06/10/2013] [Accepted: 06/28/2013] [Indexed: 11/20/2022]
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Carvalho FAO, Carvalho JWP, Alves FR, Tabak M. pH effect upon HbGp oligomeric stability: characterization of the dissociated species by AUC and DLS studies. Int J Biol Macromol 2013; 59:333-41. [DOI: 10.1016/j.ijbiomac.2013.04.070] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 04/24/2013] [Accepted: 04/25/2013] [Indexed: 10/26/2022]
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Carvalho JWP, Carvalho FA, Santiago PS, Tabak M. Thermal denaturation and aggregation of hemoglobin of Glossoscolex paulistus in acid and neutral media. Int J Biol Macromol 2013. [DOI: 10.1016/j.ijbiomac.2012.11.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Carvalho FA, Carvalho JWP, Santiago PS, Tabak M. Urea-induced unfolding of Glossoscolex paulistus hemoglobin, in oxy- and cyanomet-forms: A dissociation model. Int J Biol Macromol 2013; 52:340-8. [DOI: 10.1016/j.ijbiomac.2012.09.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 09/22/2012] [Accepted: 09/25/2012] [Indexed: 10/27/2022]
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Carvalho JWP, Santiago PS, Batista T, Salmon CEG, Barbosa LR, Itri R, Tabak M. On the temperature stability of extracellular hemoglobin of Glossoscolex paulistus, at different oxidation states: SAXS and DLS studies. Biophys Chem 2012; 163-164:44-55. [DOI: 10.1016/j.bpc.2012.02.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 02/04/2012] [Accepted: 02/06/2012] [Indexed: 10/28/2022]
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Carvalho FAO, Santiago PS, Tabak M. On the stability of the extracellular hemoglobin of Glossoscolex paulistus, in two iron oxidation states, in the presence of urea. Arch Biochem Biophys 2012; 519:46-58. [DOI: 10.1016/j.abb.2012.01.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 01/04/2012] [Accepted: 01/10/2012] [Indexed: 01/04/2023]
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Further characterization of the subunits of the giant extracellular hemoglobin of Glossoscolex paulistus (HbGp) by SDS-PAGE electrophoresis and MALDI-TOF-MS. Process Biochem 2011. [DOI: 10.1016/j.procbio.2011.08.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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