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- W1488891465 abstract "A procedure for reconstitution of the transport function of the vacuolar H(+)-translocating inorganic pyrophosphatase (H(+)-PPase; EC 3.6.1.1) prepared from etiolated hypocotyls of Vigna radiata (mung bean) is described. The method entails sequential extraction of isolated vacuolar membrane (tonoplast) vesicles with deoxycholate and CHAPS (3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate), combination of CHAPS-solubilized protein with phospholipid-cholesterol mixtures, dialysis, and glycerol density gradient centrifugation. The final proteoliposome preparation is 9-fold enriched for PPase activity and active in pyrophosphate (PPi)-energized electrogenic H(+)-translocation. Since both PPi hydrolysis and PPi-dependent H(+)-translocation by the proteoliposomes are indistinguishable from the corresponding activities of native tonoplast vesicles, the functional integrity of the H(+)-PPase appears to be conserved during solubilization and reconstitution. The high transport capacity and amenability of the reconstituted enzyme to both radiometric membrane filtration and fluorimetric H(+)-translocation assays, on the other hand, demonstrate its applicability to a broad range of transport studies. SDS-polyacrylamide gel electrophoresis of the proteoliposomes reveals selective enrichment of the M(r) 66,000, substrate-binding subunit of the H(+)-PPase and two additional polypeptides of M(r) 21,000 and 20,000. Although the M(r) 21,000 and 20,000 polypeptides have not been described previously, all attempts to reconstitute H(+)-PPase lacking these components were unsuccessful. It is therefore tentatively proposed that the M(r) 21,000 and 20,000 polypeptides, as well as the M(r) 66,000 subunit, are required for the productive reconstitution of PPi-dependent H(+)-translocation." @default.
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- W1488891465 date "1992-10-01" @default.
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- W1488891465 title "Reconstitution of transport function of vacuolar H(+)-translocating inorganic pyrophosphatase." @default.
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- W1488891465 doi "https://doi.org/10.1016/s0021-9258(19)36690-6" @default.
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