Effects of Magnesium and Calcium on the Oxygenation Reaction of Erythrocruorin from the Marine Polychaete Arenicola marina and the Terrestrial Oligochaete Lumbricus terrestris(Physiology)

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概要

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• Oxygenation function of annelid erythrocruorin (Er) is affected by Mg and Ca concentration in the blood. Four classes of responces may be encountered in different species: 1) Mg=Ca (equal effects), 2) Mg>Ca, 3) Mg<Ca and 4) no effect. In the marine polychaete Arenicola marina, at physiological pH and 20℃, Mg and Ca exerted almost equivalent effects in increasing oxygen affinity in the range of 1-200 mM. As measured from the slope of Δlog P_<1/2>/Δlog [Cation] the effect of Mg was larger than that of Ca at the physiological concentration of respective ion (55 mM Mg; 10 mM Ca). The n_<1/2> value was similar in the presence of both cations (pH 7.0) or higher for Mg (pH 7.6). In the terrestrial oligochaete Lumbricus terrestris, at the same condition, Ca was more effective than Mg, in raising oxygen affinity at both pHs, also at the physiological concentration (2-4 mM Mg; 8 mM Ca), and n_<1/2> was similar for Mg and Ca (pH 7.0) or higher for Ca (pH 7.6). The Bohr factor, -[Δlog P_<1/2>/ΔpH], is maintained its maximum value within the span of the physiological concentration of Mg in Arenicola. In Lumbricus, Ca can contribute to the increase of the Bohr factor at the physiological concentration, but Mg cannot contribute to it. These results reveal that Arenicola and Lumbricus belong to classes 1) and 3), respectively, and that the oxygenation function of both Ers may be controlled by effective utilization of the more dominant of the divalent cations Mg and Ca.

• 社団法人日本動物学会の論文
• 2002-09-25

著者

• Ochiai Takehiko

  Department Of Biology Fukushima Medical University School Of Medicine

• Weber Roy

  Department of Zoophysiology, University of Aarhus

• Weber Roy

  Department Of Zoophysiology University Of Aarhus

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• THE STABILITY PROPERTIES OF YEAST FLAVOHEMOGLOBIN(Biochemistry,Abstracts of papers presented at the 74^ Annual Meeting of the Zoological Society of Japan)
• Effects of Magnesium and Calcium on the Oxygenation Reaction of Erythrocruorin from the Marine Polychaete Arenicola marina and the Terrestrial Oligochaete Lumbricus terrestris(Physiology)
• Extreme heterogeneous composition of the Paramecium caudatum macronuclear genomic DNA between hemoglobin and nucleosome assembly protein-1 genes.

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