Summary
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1.
Branchial activities of Na+−K+-ATPase, ouabain-insensitive ATPase, (Mg++-ATPase) and Ca++-ATPase were measured inGillichthys mirabilis after adaptation to salinities ranging from 170% SW to FW. Stabilities of these activities against freezing and deoxycholate solubilization and the temperature-dependence of activity rates were also investigated. Subcellular distribution and some kinetic properties of these activities, and of SDH were compared in branchial tissues of fish adapted to 170% SW and to FW.
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2.
Na+−K+-ATPase was maximally active at a Na+ concentration of 180 mM and K+ concentration of 60 mM. This enzyme was least active in 100% SW-adapted animals, but showed elevated activity after adaptation to 170% SW and to FW.Gillichthys is unusual (but not unique) among euryhaline teleosts by displaying higher Na+−K+-ATPase in FW- than in SW-adapted animals. Greatest activity, however, was observed in the heavy microsomal fraction (34,000xg) of the 170% SW-adapted group. Maximum SDH activity was also observed in the mitochondrial fraction (25,000xg) of 170% SW-adapted fish.
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3.
Activity of Ca++-ATPase displayed a complex Ca++-dependence. Two kinetic forms of this activity could be resolved, one with a high Ca++-affinity (K m=2.9 μM), the other having low Ca++-affinity (K m=0.88 mM). The low-affinity activity was reduced in branchial homogenates of 170% SW-compared with FW-adapted fish; the heavy microsomal fraction (34,000xg) derived from gills was most enriched in this Ca++-dependent ATPase in FW-adaptedGillichthys. In contrast, activities of the high-affinity form were equally enriched in heavy microsomal fractions of 170% SW- and FW-adapted animals. The high-affinity Ca++-ATPase was far more sensitive to inhibition by deoxycholate treatment than the low-affinity component. The possible roles of heterogeneous Ca++-dependent activities in branchial Ca++-transport are discussed.
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4.
Gill Mg++-ATPase activity was significantly elevated in FW and in 5% SW-adapted animals compared with the marine (170% SW- and 100% SW-adapted fish). The Mg++-dependent activity was most concentrated in the heavy microsomal fraction and to a lesser extent in the light microsomal and mitochondrial fractions in both 170% SW- and FW-adaptedGillichthys.
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Abbreviations
- Ca++-ATPase:
-
calcium-activated adenosinetriphosphatase(EC 3.6.1.3.)
- DMSO:
-
dimethylsulfoxide
- EDTA:
-
ethylenediamine tetracetic acid
- EGTA:
-
ethyleneglycol-bis- (aminoethyl ether) N,N′-tetracetic acid
- ELON:
-
β-methylaminophenol sulfate
- FW:
-
freshwater
- HEPES:
-
N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- Mg++-ATPase:
-
magnesium-activated adenosinetriphosphatase (EC 3.6.1.3)
- Na+−K+-ATPase:
-
sodium, potassium-activated adenosinetriphosphatase (EC 3.6.1.3)
- SDH:
-
succinate dehydrogenase (EC 1.3.99.1)
- SW:
-
seawater
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Supported by University of Michigan Phoenix Project and by NSF grant PCM-7922985
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Doneen, B.A. Effects of adaptation to sea water, 170% sea water and to fresh water on activities and subcellular distribution of branchial Na+−K+-ATPase, low- and high affinity Ca++-ATPase, and ouabain-insensitive ATPase inGillichthys mirabilis . J Comp Physiol B 145, 51–61 (1981). https://doi.org/10.1007/BF00782593
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DOI: https://doi.org/10.1007/BF00782593