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- W2004376667 abstract "This work represents the first stage of thiol-based cross-linking studies to map the oligomeric interface of the homotrimeric membrane protein diacylglycerol kinase (DAGK). A total of 53 single-cysteine mutants spanning DAGK's three transmembrane segments and the first part of a cytoplasmic domain were purified and subjected to catalytic oxidation in mixed micelles. Four mutants (A52C, I53C, A74C, and I75C) were observed to undergo intratrimer disulfide bond formation between homologous sites on adjacent subunits. To establish whether the homologous sites are proximal in the ground-state conformation of DAGK or whether the disulfide bonds formed as a result of motions that brought normally distal sites into transient proximity, additional cross-linking experiments were carried out in three different milieus of varying fluidity [mixed micelles, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) vesicles, and Escherichia coli membranes]. Cross-linking experiments included disulfide bond formation under three different catalytic conditions [Cu(II)-phenanthroline oxidation, I2 oxidation, and thionitrobenzoate-based thiol exchange] and reactions with a set of bifunctional thiol-reactive chemical cross-linkers presenting two different reactive chemistries and several spacer lengths. On the basis of these studies, residues 53 and 75 are judged to be in stable proximity within the DAGK homotrimer, while position 52 appears to be more distal and forms disulfide bonds only as a result of protein motions. Results for position 74 were ambiguous. In lipid vesicles and mixed micelles DAGK appears to execute motions that are not present in native membranes, with mobility also being higher for DAGK in mixed micelles than in POPC vesicles." @default.
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- W2004376667 date "2000-03-15" @default.
- W2004376667 modified "2023-09-24" @default.
- W2004376667 title "Mapping the Oligomeric Interface of Diacylglycerol Kinase by Engineered Thiol Cross-Linking: Homologous Sites in the Transmembrane Domain" @default.
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- W2004376667 doi "https://doi.org/10.1021/bi991781n" @default.
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