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• W1569258727 abstract "We report an optical and EPR spectral study of three hemoglobins, Hb I, II, and III, from the gill of the clam Lucina pectinata. Hemoglobin I reacts much more avidly with hydrogen sulfide than do Hbs II and III. The proximal ligand to the heme iron of each hemoglobin is histidyl imidazole. The acid/alkaline transition of ferric Hb I occurs with pK 9.6; those of ferric Hbs II and III with pK 6.6 and 5.9, respectively. At their acid limits each ferric hemoglobin exists as aquoferric hemoglobin. Broadening of the g = 6 resonance suggests that the bound water enjoys great positional freedom. Ferric Hb I, at the alkaline limit (pH 11), exists as ferric hemoglobin hydroxide. Ferric Hbs II and III, at their alkaline limit (pH 7.5), each exist as equal mixtures of two species. The low spin species with optical maxima near 541 and 576 nm and g values of 2.61, 2.20, and 1.82, are identified as ferric hemoglobin hydroxide. The high spin species, with optical maxima near 486 and 603 nm and g values of 6.71, 5.87, and 5.06, resemble Dicrocoelium hemoglobin and hemoglobin MSaskatoon. Here we show that Hbs II and III resemble hemoglobin MSaskatoon in which a distal tyrosinate oxygen ligated to the ferric heme iron at alkaline pH is displaced by water at acid pH. The H2S product of ferric Hb I is identified as ferric hemoglobin sulfide." @default.
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• W1569258727 date "1990-09-01" @default.
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• W1569258727 title "Hemoglobins of the Lucina pectinata/bacteria symbiosis. II. An electron paramagnetic resonance and optical spectral study of the ferric proteins." @default.
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• W1569258727 doi "https://doi.org/10.1016/s0021-9258(17)46186-2" @default.
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