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Type: Artigo de periódico
Title: Effect of thiol reagents on functional properties and heme oxidation in the hemoglobin of Geochelone carbonaria
Author: Torsoni, MA
Viana, RI
Barros, BF
Stoppa, G
Cesquini, M
Ogo, SH
Abstract: The reaction of thiol reagents with G. carbonaria hemoglobin was studied, and the oxygen equilibrium and kinetic of oxidation of derivatives determined. The oxygen affinity and kinetic of oxidation of hemoglobin derivatives were modified to various extents depending on the nature of thiol reagents used. Diamide yielded approximately 80% polymeric hemoglobin, although the oxidation kinetic, and the functional properties, were practically invariant (T-1/2 =10.0 min.; P50 = 5.0 mm Hg at pH 7.4; alkaline Bohr effect = -0.64). Iodoacetamide did not modify the electrophoretic pattern significantly, although all the free SH groups of hemoglobin were alkylated. A P50 of 2.5 mmHg at pH 7.4 and the Bohr effect of -0.15 were obtained; the T-1/2 Of about 6.4 min. was shorter than that for un-modified Hb. Similar T-1/2 were obtained for Hb treated with oxidized glutathione, which produced polymeric Hb and glutathionyl-Hb. The oxygen binding characteristics showed that both of Hb derivatives, glutathionyl-Hb and polymeric Hb, maintain the capacity to transport the gas.
Subject: Geochelone carbonaria
polymeric hemoglobin
available SH groups
functional properties
Country: Australia
Editor: Academic Press Aust
Citation: Biochemistry And Molecular Biology International. Academic Press Aust, v. 40, n. 2, n. 355, n. 364, 1996.
Rights: fechado
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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