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|Type:||Artigo de periódico|
|Title:||BOTHROPS-ALTERNATUS HEMOGLOBIN COMPONENTS - OXYGEN-BINDING PROPERTIES AND GLOBIN CHAIN HYDROPHOBIC ANALYSIS|
|Abstract:||1. Bothrops alternatus oxyhemolysate showed two components by DE-52 cellulose ion-exchange chromatography and polyacrylamide gel electrophoresis: Hb I representing 70% of the hemolysate and Hb II (30%); both are dimeric in the stripped form (mol.wt 32,500 Da) and tetrameric in the presence of IHP (64,000 Da). 2. Hb I, Hb II and whole hemolysate showed functionally similar properties to those of Liophis miliaris, i.e. for the stripped form over the pH interval 7.2-8.9: log P50 values decreasing from +/- 0.1 to +/- -0.15 (thereby an alkaline Bohr effect); DELTAH+ = -0.38 and Hill coefficient values decreasing from n(H) = 1.5 to 1.0. In the presence of ATP, an abrupt decrease in O2 affinity occurs and the log P50 values change from 1.0 to 0.05; the Bohr effect increases to DELTAH+ = -0.7 whereas the n(H) values decrease from greater-than-or-equal-to 2 to values close to unity. 3. For B. alternatus, at a physiological pH range (7.8-9.0) the hemoglobin Bohr effect becomes apparent only in the presence of ATP and this seems to be fundamental for the O2 uptake of the snake. 4. HPLC analysis of the globins shows eight different chains instead of four, as found in L. miliaris hemoglobin, which corroborates the presence of Hb I and Hb II components in B. alternatus, and also shows that the unique tetramer formed from different alpha and beta chains is also consistent in this snake.|
|Editor:||Pergamon-elsevier Science Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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