EFFECTS OF ERYTHROCYTIC NUCLEOSIDE TRIPHOSPHATES ON OXYGEN EQUILIBRIA OF COMPOSITE AND FRACTIONATED HEMOGLOBINS FROM THE FACULTATIVE AIR-BREATHING AMAZONIAN CATFISH, HYPOSTOMUS AND PTERYGOPLICHTHYS

被引:20
作者
WEBER, RE [1 ]
WOOD, SC [1 ]
机构
[1] UNIV NEW MEXICO,DEPT PHYSIOL,ALBUQUERQUE,NM 87131
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-PHYSIOLOGY | 1979年 / 62卷 / 01期
关键词
D O I
10.1016/0300-9629(79)90752-7
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. 1. Oxygen equilibria of Hypostomus and Pterygoplichthys hemoglobins and their sensitivities to the erythrocytic nucleotide triphosphates (NTP), ATP and guanosine triphosphate (GTP) are studied to investigate the mechanisms by which blood adapts to air- and water-breathing (cf. Weber et al., 1979). 2. 2. Hemoglobins of both species are heterogeneous. All hemoglobin fractions isolated by iso-electric focusing reveal a high sensitivity to NTP, but GTP depresses O2 affinity about twice as effectively as ATP. A cathodal hemoglobin component with a reversed Bohr effect was found in Pterygoplichthys but not in Hypostomus. 3. 3. The data are discussed in relation to the in vivo cofactor modulation of blood O2 affinity and the adaptive significance of functional heterogeneity of fish hemoglobins. © 1979.
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页码:179 / 183
页数:5
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