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Two spin-labelled derivatives of the 5-(2-indolyl)-2,4-pentadienoyl class of inhibitors of the vacuolar ATPase have been synthesised and their EPR properties characterised in phospholipid membranes. One spin-labelled inhibitor is the amide derivative of pentadienic acid and 4-amino-TEMPO (INDOL6), and the other is the 3-hydroxymethyl-PROXYL ester (INDOL5). The response of the EPR spectra to the chain-melting...
The incorporation of concanamycin A, a potent inhibitor of vacuolar ATPases, into membranes of dimyristoyl phosphatidylcholine has been studied by using EPR of spin-labelled lipid chains. At an inhibitor/lipid ratio of 1:1 mol/mol, concanamycin A broadens the chain-melting transition of the phospholipid bilayer membrane, and effects the lipid chain motion in the fluid phase. The outer hyperfine splitting...
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