Topic
Vanadate
About: Vanadate is a research topic. Over the lifetime, 4497 publications have been published within this topic receiving 120109 citations. The topic is also known as: vanadate.
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TL;DR: Observations indicate that cell surface fluorescence was due to the capture of Ca2+ by Calcium Green C18 after Ca2-ATPase had been translocated across osteoblast plasma membranes.
46 citations
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TL;DR: The results showed similar effects of the three inhibitors of Na(+)/K(+)-ATPase; indicating that Src activation in such experiments is primarily due to the ATP-sparing effect of the ATPase inhibitor on the mixture of two enzymes competing for ATP.
46 citations
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TL;DR: This study suggests several sites on aldolase will accommodate oxoanions, and one of these sites also accommodates vanadyl cation, which has the lowest inhibition constant under these high ionic strength conditions.
Abstract: Reductive, nonreductive, and photolytic interactions of vanadate with fructose-1,6-bisphosphate aldolase were examined and used to explore the interactions of oxoanions with aldolase. Aldolase is known to interact strongly with oxoanions at low ionic strength and weakly at higher ionic strength. Oxoanions inhibit aldolase competitively with respect to fructose 1,6-bisphosphate although the location of the oxoanion binding site on aldolase remains elusive. In this work, the interaction of aldolase with a series of oxoanions was compared at ionic strength approaching physiologic levels. The size and shape of the anion were important for the effective binding to aldolase, and no significant increase in affinity for aldolase was observed by the addition of alkyl groups to the oxoanions. Vanadate competitively inhibits aldolase in a manner analogous to the other oxoanions. Since vanadate solutions contain a mixture of vanadate oxoanions, the nature of the inhibition was determined using a combination of enzyme kinetics and 51V NMR spectroscopy. Aldolase contains a significant number of thiol functionalities, and as expected, vanadate undergoes redox chemistry with them, generating an irreversibly inhibited aldolase. This oxidative chemistry was attributed to the vanadate tetramer, whereas vanadate dimer was a reversible inhibitor. Vanadate monomer does not significantly interact with aldolase reversibly or irreversibly. Vanadyl cation has the lowest inhibition constant under these high ionic strength conditions. Using Yonetani-Theorell analysis, it appears that phosphate, pyrophosphate, and sulfate bind to the same site on aldolase, whereas vanadate, arsenate, and molybdate bind to another site. UV light-induced photocleavage of aldolase by vanadate was examined, and the loss of aldolase activity was correlated with cleavage of the aldolase subunit. Further studies using vanadium as a probe should reveal details on the location of the vanadate and vanadyl cation binding sites. This study suggests several sites on aldolase will accommodate oxoanions, and one of these sites also accommodates vanadyl cation.
46 citations
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46 citations
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TL;DR: Tris(2-((ethylimino)methyl)pyren-1-ol)amine (1) was synthesized and introduced as the first tetrameric vanadate fluorescence sensor, the entire binding of which was successfully accomplished in two steps with distinct colorimetric changes and "off-on" fluorescent enhancement.
46 citations