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Na ++K +-ATPase in gills of aquatic crustacea

Lucu, Čedomil ; Towle, David W.

Comparative Biochemistry and Physiology, Part A, 2003-06, Vol.135 (2), p.195-214 [Periódico revisado por pares]

United States: Elsevier Inc

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  • Título:
    Na ++K +-ATPase in gills of aquatic crustacea
  • Autor: Lucu, Čedomil ; Towle, David W.
  • Assuntos: Amino Acid Sequence ; Animals ; Antennal gland ; ATPase ; Biological Transport, Active ; Crab ; Crustacea ; Crustacea - enzymology ; Enzyme Activation ; Gill ; Gills - enzymology ; Hemolymph ; Isopod ; Kinetics ; Lobster ; Molecular Sequence Data ; Molting ; mRNA expression ; Osmoregulation ; Sequence Alignment ; Shrimp ; Sodium pump ; Sodium-Potassium-Exchanging ATPase - chemistry ; Sodium-Potassium-Exchanging ATPase - metabolism
  • É parte de: Comparative Biochemistry and Physiology, Part A, 2003-06, Vol.135 (2), p.195-214
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-3
    content type line 23
    ObjectType-Review-2
  • Descrição: The sodium pump, or Na ++K +-ATPase, provides at least part of the driving force for transepithelial movement of monovalent ions across the gills and other transporting tissues in many aquatic animals including the Crustacea. The crustacean Na ++K +-ATPase, like that in all animal cells, is composed of a catalytic α-subunit and an accompanying β-subunit. The amino acid sequence of the crustacean α-subunit is 71–74% identical to vertebrate α-subunit sequences. In brachyuran Crustacea, the Na ++K +-ATPase is more highly expressed in posterior gills compared with anterior and is found predominantly in mitochondria-rich cells that are morphologically and biochemically specialized to mediate NaCl uptake from the medium. When the external salinity is lowered from that of normal seawater, producing conditions in which many euryhaline Crustacea hyperosmoregulate their hemolymph, both the enzymatic activity of the Na ++K +-ATPase and the gene expression of the α-subunit are increased in these tissues. Although the precise regulatory mechanism is not known, evidence suggests that crustacean hyperglycemic hormone may be responsible for the induction of Na ++K +-ATPase activity. Whether it also plays a role in activation of gene transcription is not known. A comparison of a range of aquatic Crustacea suggests that the level of Na ++K +-ATPase function in transporting tissues may be correlated with their ability to invade estuarine habitats.
  • Editor: United States: Elsevier Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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