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Arata PX, Quintana I, Canelón DJ, Vera BE, Compagnone RS, Ciancia M. Chemical structure and anticoagulant activity of highly pyruvylated sulfated galactans from tropical green seaweeds of the order Bryopsidales. Carbohydr Polym 2014; 122:376-86. [PMID: 25817682 DOI: 10.1016/j.carbpol.2014.10.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 09/24/2014] [Accepted: 10/08/2014] [Indexed: 11/30/2022]
Abstract
Sulfated and pyruvylated galactans were isolated from three tropical species of the Bryopsidales, Penicillus capitatus, Udotea flabellum, and Halimeda opuntia. They represent the only important sulfated polysaccharides present in the cell walls of these highly calcified seaweeds of the suborder Halimedineae. Their structural features were studied by chemical analyses and NMR spectroscopy. Their backbone comprises 3-, 6-, and 3,6-linkages, constituted by major amounts of 3-linked 4,6-O-(1'-carboxy)ethylidene-d-galactopyranose units in part sulfated on C-2. Sulfation on C-2 was not found in galactans from other seaweeds of this order. In addition, a complex sulfation pattern, comprising also 4-, 6-, and 4,6-disulfated galactose units was found. A fraction from P. capitatus, F1, showed a moderate anticoagulant activity, evaluated by general coagulation tests and also kinetics of fibrin formation was assayed. Besides, preliminary results suggest that one of the possible mechanisms involved is direct thrombin inhibition.
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Affiliation(s)
- Paula X Arata
- Cátedra de Química de Biomoléculas, Departamento de Biología Aplicada y Alimentos, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina
| | - Irene Quintana
- Laboratorio de Hemostasia y Trombosis, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pabellón 2, C1428EHA Buenos Aires, Argentina
| | - Dilsia J Canelón
- Escuela de Bioanálisis, Facultad de Medicina, Universidad Central de Venezuela, Av. Carlos Raúl Villanueva, Ciudad Universitaria, Los Chaguaramos, 1051 Caracas, Venezuela
| | - Beatriz E Vera
- Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Av. Paseo de los Ilustres, Ciudad Universitaria, Los Chaguaramos, 1450 Caracas, Venezuela
| | - Reinaldo S Compagnone
- Laboratorio de Ecología y Taxonomía de Macrófitas Marinas, Centro de Botánica Tropical, Instituto de Biología Experimental, Universidad Central de Venezuela, Apdo.47114, Caracas, Venezuela
| | - Marina Ciancia
- Cátedra de Química de Biomoléculas, Departamento de Biología Aplicada y Alimentos, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina; CIHIDECAR-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
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Fernández PV, Quintana I, Cerezo AS, Caramelo JJ, Pol-Fachin L, Verli H, Estevez JM, Ciancia M. Anticoagulant activity of a unique sulfated pyranosic (1->3)-β-L-arabinan through direct interaction with thrombin. J Biol Chem 2013; 288:223-33. [PMID: 23161548 PMCID: PMC3537017 DOI: 10.1074/jbc.m112.386441] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 10/19/2012] [Indexed: 11/06/2022] Open
Abstract
A highly sulfated 3-linked β-arabinan (Ab1) with arabinose in the pyranose form was obtained from green seaweed Codium vermilara (Bryopsidales). It comprised major amounts of units sulfated on C-2 and C-4 and constitutes the first polysaccharide of this type isolated in the pure form and fully characterized. Ab1 showed anticoagulant activity by global coagulation tests. Less sulfated arabinans obtained from the same seaweed have less or no activity. Ab1 exerts its activity through direct and indirect (antithrombin- and heparin cofactor II-mediated) inhibition of thrombin. Direct thrombin inhibition was studied in detail. By native PAGE, it was possible to detect formation of a complex between Ab1 and human thrombin (HT). Ab1 binding to HT was measured by fluorescence spectroscopy. CD spectra of the Ab1 complex suggested that ligand binding induced a small conformational change on HT. Ab1-thrombin interactions were studied by molecular dynamic simulations using the persulfated octasaccharide as model compound. Most carbohydrate-protein contacts would occur by interaction of sulfate groups with basic amino acid residues on the surface of the enzyme, more than 60% of them being performed by the exosite 2-composing residues. In these interactions, the sulfate groups on C-2 were shown to interact more intensely with the thrombin structure. In contrast, the disulfated oligosaccharide does not promote major conformational modifications at the catalytic site when complexed to exosite 1. These results show that this novel pyranosic sulfated arabinan Ab1 exerts its anticoagulant activity by a mechanism different from those found previously for other sulfated polysaccharides and glycosaminoglycans.
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Affiliation(s)
- Paula V. Fernández
- From the Cátedra de Química de Biomoléculas, Departamento de Biología Aplicada y Alimentos, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417 Buenos Aires, Argentina
| | - Irene Quintana
- the Laboratorio de Hemostasia y Trombosis, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Buenos Aires, Argentina
| | - Alberto S. Cerezo
- the Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Buenos Aires, Argentina
| | - Julio J. Caramelo
- the Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA), CONICET, Av. Patricias Argentinas 435, 1405 Buenos Aires, Argentina
| | - Laercio Pol-Fachin
- the Programa de Pos-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Hugo Verli
- the Programa de Pos-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
- the Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, 90610–000 Porto Alegre, Rio Grande do Sul, Brasil, and
| | - José M. Estevez
- the Instituto de Fisiología, Biología Molecular y Neurociencias (IFIByNE-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Buenos Aires, Argentina
| | - Marina Ciancia
- From the Cátedra de Química de Biomoléculas, Departamento de Biología Aplicada y Alimentos, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417 Buenos Aires, Argentina
- the Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Buenos Aires, Argentina
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