کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1976103 | 1060675 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Functional characterization of the single hemoglobin of the migratory bird Ciconia ciconia
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کلمات کلیدی
inositol pentakisphosphateIHPRP-HPLCP50BPGH50Ciconia ciconiaAUT-PAGEReversed phase-HPLC2,3-bisphosphoglycerate - 2،3-bisphosphoglycerateInositol hexakisphosphate - Inositol hexakis فسفاتEnthalpy - آنتالپیPhosphate binding - اتصال فسفاتBohr effect - اثر بورHemoglobin - هموگلوبینOxygen affinity - وابستگی اکسیژنMigratory bird - پرنده مهاجرChloride - کلرید
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Functional characterization of the single hemoglobin of the migratory bird Ciconia ciconia Functional characterization of the single hemoglobin of the migratory bird Ciconia ciconia](/preview/png/1976103.png)
چکیده انگلیسی
Hemolysate from white stork displayed a single hemoglobin component, thus resulting into two bands and two globin peaks in dissociating PAGE and reversed phase-HPLC, respectively. Stripped hemoglobin showed an oxygen affinity higher than that of human HbA, a small Bohr effect, and a cooperative oxygen binding. A small decrease of oxygen affinity, of the same extent in all the pH range examined, was observed by addition of chloride, thus indicating an unusual chloride-independent Bohr effect (ÎlogP50 / Îlog pH = â 0.24). Saturating amounts of inositol hexakisphosphate, largely decreased hemoglobin-oxygen affinity (ÎlogP50 = 1.17 at pH 7.0), and increased the extent of its Bohr effect (ÎlogP50 / ÎlogpH = â 0.45). The phosphate binding curve allowed to measure a very high overall binding constant (K = 1.18 Ã 105 Mâ 1). The effect of temperature on the oxygen affinity was measured, and the enthalpy change of oxygenation resulted almost independent on pH. Structural-functional relationships are discussed by considering some amino acid residues situated at α1/β1 and α1/β2 interfaces, such as α38 and α89 positions. The presence of only one hemoglobin component, a rare event among birds, and its functional properties have been related to the physiological oxygen requirements of this soaring migrant bird and to its technique of flight during migration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 147, Issue 2, June 2007, Pages 242-249
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 147, Issue 2, June 2007, Pages 242-249
نویسندگان
Barbara Manconi, Alessandra Olianas, Maria T. Sanna, Irene Messana, Loredana Demurtas, Massimo Castagnola, Bruno Giardina, Mariagiuseppina Pellegrini,