Allosteric water and phosphate effects in Hoplosternum littorale hemoglobins
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چکیده
منابع مشابه
Isohemoglobin differentiation in the bimodal-breathing amazon catfish Hoplosternum littorale.
The bimodal gill(water)/gut(air)-breathing Amazonian catfish Hoplosternum littorale that frequents hypoxic habitats uses "mammalian" 2,3-diphosphoglycerate (DPG) in addition to "piscine" ATP and GTP as erythrocytic O(2) affinity modulators. Its electrophoretically distinct anodic and cathodic hemoglobins (Hb(An) and Hb(Ca)) were isolated for functional and molecular characterization. In contras...
متن کاملAllosteric effect of water in fish and human hemoglobins.
Prompted by the reported lack of solvation effects on the oxygen affinity of fish (trout I) hemoglobin that questioned allosteric water binding in human hemoglobin A (Bellelli, A., Brancaccio, A., and Brunori, M. (1993) J. Biol. Chem. 268, 4742-4744), we have investigated solvation effects in fish and human hemoglobins by means of the osmotic stress method and allosteric analysis. In contrast t...
متن کاملAllosteric transitions in cobalt hemoglobins.
Circular dichroism and difference ultraviolet visible spectra were obtained for cobalt hemoglobin derivatives. At 287 nm the ellipticity difference between the oxy- and deoxycobaltohemoglobin is about one-half as great as that for the native proteins indicating smaller quaternary conformational changes for the former. Deoxygenation increases the Soret rotational strengths of both iron and cobal...
متن کاملThe role of size in synchronous air breathing of Hoplosternum littorale.
Synchronized air breathing may have evolved as a way of minimizing the predation risk known to be associated with air breathing in fish. Little is known about how the size of individuals affects synchronized air breathing and whether some individuals are required to surface earlier than necessary in support of conspecifics, while others delay air intake. Here, the air-breathing behavior of Hopl...
متن کاملCrude oil exposure affects air-breathing frequency, blood phosphate levels and ion regulation in an air-breathing teleost fish, Hoplosternum littorale.
Exposure of a facultative air breather, Hoplosternum littorale, to 12.5, 25, and 37.5% of the water soluble fraction (WSF) of Urucu crude oil, resulted in a rapid increase in air-breathing frequency (ABF) sustained over the 45 min period of exposure. Following 4 h exposure to a graded increase in WSF up to 50%, there was no significant affect on haematocrit, or plasma [Na+] and [K+]. Crude oil ...
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ژورنال
عنوان ژورنال: European Journal of Biochemistry
سال: 2004
ISSN: 0014-2956,1432-1033
DOI: 10.1111/j.1432-1033.2004.04366.x