NDLI: The oppositely directed Ca2+ and Na+ transmembrane transport in algal cells

Content Provider	Springer Nature Link
Author	Karimova, Fatima G. Kortchougava, Ekaterina E. Tarchevsky, Igor A. Iagoucheva, Madina R.
Copyright Year	2000
Abstract	The countertransport of Ca2+ and Na+ across the membranes of the unicellular fresh-water algaChlamydomonas reinhardtii CW-15 and twoDunaliella species differing in salt tolerance was studied. All algae used are devoid of cell walls. The calcium uptake by twoDunaliella species depended markedly on the intracellular sodium concentration. This calcium uptake was accompanied by Na+ release. For 15 and 30 s after artificial gradient formation (Naint + greater than Naext +) the ratio of released Na+ to absorbed Ca2+ was 3∶1 and 4∶1, respectively. For the extremely halotolerantD. salina, the apparent Michaelis constant of the Ca2+ uptake was 33 μM, and for the marine halotolerant algaD. maritima, it was equal to 400 μM, presuming more efficient Na+-for-Ca2+ exchange inD. salina cells. Ouabain, an inhibitor of Na+/K+-ATPase, suppressed Na+ transfer by 25%, whereas the agents blocking Ca2+-channels did not affect the transport of Ca2+ and Na+. The oppositely directed transmembrane Ca2+ and Na+ transfer was shown to depend on the external concentrations of Na+ and H+. In the fresh-water algaC. reinhardtii CW-15 (Naext + greater than Naint +), the direction of Ca2+ and Na+ fluxes across the plasma membrane was opposite to those described for Dunaliella cells. The results obtained point to the ability of the Na+-Ca2+ exchanger function in plasma membranes of algal cells.
Starting Page	93
Ending Page	98
Page Count	6
File Format	PDF
ISSN	0033183X
Journal	Protoplasma
Volume Number	213
Issue Number	1-2
e-ISSN	16156102
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dunaliella Calcium Sodium Transport Na+-Ca2+ exchanger Algae Cell Biology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine

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