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J Biol Chem, Vol. 274, Issue 12, 7923-7928, March 19, 1999
§,
From the Hypotonic volume expansion of skate erythrocytes
rapidly stimulates the tyrosine phosphorylation of band 3, the membrane
protein thought to mediate the osmotically sensitive taurine efflux.
Skate erythrocytes possess numerous tyrosine kinases including p59fyn, p56lyn, pp60src, and p72syk, demonstrated by immune
complex assays measuring autocatalytic kinase activity. Inclusion of
the cytoplasmic domain of band 3 in this assay showed that only Syk and
Lyn can directly phosphorylate the cytoplasmic domain of band 3. Upon
cell volume expansion, Syk activity was increased as assessed by three
different assays (immune complex assay measuring autophosphorylation,
assay of the level of phosphotyrosine of the immunoprecipitated kinase, and assay of level of 32P in the kinase
immunoprecipitated from cells prelabeled with 32PO4 and then volume-expanded). The tyrosine
kinase Lyn was also stimulated by volume expansion, most notably when
analyzed by the latter two methods. Volume expansion stimulated a large
increase in the ability of Syk to phosphorylate band 3 at times that
coincide with the stimulation of taurine flux. The stilbene piceatannol inhibited Syk preferentially over Lyn and other tyrosine kinases and
inhibited volume-stimulated taurine efflux in a
concentration-dependent manner similar to that for the
inhibition of Syk. Two major phosphorylation peaks were detected in
tryptic digests of cdb3 separated by reverse phase HPLC. Edman
degradation demonstrated a phosphotyrosine in a YXXL motif.
In conclusion, p72syk appears to be a strong candidate as a
pivotal signal-transducing step in the volume-activated taurine efflux
in skate red cells. The level of band-3 phosphorylation may be
regulated, in addition, by a protein-tyrosine phosphatase of the 1B variety.
The Inflammatory Bowel Disease Research
Center, The University of Chicago, Chicago, Illinois 60637, ¶ Division of Biology and Medicine, Brown University, Providence,
Rhode Island 02912, and § Mount Desert Island Biological
Laboratory, Salsbury Cove, Maine 04672
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