Abstract：
:The effect of regucalcin, which is a regulatory protein of Ca(2+) signaling, on Ca(2+)-ATPase activity in isolated rat renal cortex mitochondria was investigated. The presence of regucalcin (50, 100, and 250 nM) in the enzyme reaction mixture led to a significant increase in Ca(2+)-ATPase activity. Regucalcin significantly stimulated ATP-dependent (45)Ca(2+) uptake by the mitochondria. Ruthenium red (10(-6) M) or lanthunum chloride (10(-6) M), an inhibitor of mitochondrial Ca(2+) uptake, markedly inhibited regucalcin (100 nM)-increased mitochondrial Ca(2+)-ATPase activity and (45)Ca(2+) uptake. The effect of regucalcin (100 nM) in elevating Ca(2+)-ATPase activity was completely prevented by the presence of digitonin (10(-2)%), a solubilizing reagent of membranous lipids, vanadate, an inhibitor of phosphorylation of ATPase, or dithiothreitol (50 mM), a protecting reagent of the sulfhydryl (SH) group of the enzyme. The activating effect of regucalcin (100 nM) on Ca(2+)-ATPase activity was not further enhanced by calmodulin (0.30 microM) or dibutyryl cyclic AMP (10(-4) M), which could increase Ca(2+)-ATPase activity. Trifluoperazine (TFP; 50 microM), an antagonist of calmodulin, significantly decreased Ca(2+)-ATPase activity. The activating effect of regucalcin on the enzyme was also seen in the presence of TFP, indicating that regucalcin's effect is not involved in mitochondrial calmodulin. The present study demonstrates that regucalcin can stimulate Ca(2+)-pump activity in rat renal cortex mitochondria, and that the protein may act on an active site (SH group) related to phosphorylation of mitochondrial Ca(2+)-ATPase.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Xue JH,Takahashi H,Yamaguchi Mdoi
10.1002/1097-4644(20010201)80:2<285::aid-jcb180>3.subject
Has Abstractpub_date
2000-10-20 00:00:00pages
285-92issue
2eissn
0730-2312issn
1097-4644pii
10.1002/1097-4644(20010201)80:2<285::AID-JCB180>3.journal_volume
80pub_type
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