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• W2005280228 abstract "SecA ATPase promotes the biogenesis of membrane and secretory proteins into and across the cytoplasmic membrane of Eubacteria. SecA binds to translocon component SecYE and substrate proteins and undergoes ATP-dependent conformational cycles that are coupled to the stepwise translocation of proteins. Our recent crystal structure of B. subtilis SecA [Hunt, J. F., Weinkauf, S., Henry, L., Fak, J. J., McNicholas, P., Oliver, D. B., and Deisenhofer, J. (2002) Science 297, 2018−2026] showed two different dimer interactions in the lattice which both buried significant solvent-accessible surface area in their interface and could potentially be responsible for formation of the physiological dimer in solution. In this paper, we utilize fluorescence resonance energy transfer methodology with genetically engineered SecA proteins containing unique pairs of tryptophan and fluorophore-labeled cysteine residues to determine the oligomeric structure of SecA protein in solution. Our results show that of the two dimers interactions observed in the crystal structure, SecA forms an antiparallel dimer in solution that maximizes the buried solvent-accessible surface area and intermolecular contacts. At the submicromolar protein concentrations used in the fluorescence experiments, we saw no evidence for the formation of higher-order oligomers of SecA based on either the alternative dimer or the 31 helical fiber observed in the crystal lattice. Our studies are consistent with previous ones demonstrating the existence of a dimerization determinant within the C-domain of SecA as well as those documenting the interaction of N- and C-domains of SecA. Our results also provide a valuable starting point for a determination of whether the subunit status of SecA changes during the protein translocation as well as studies designed to elucidate the conformational dynamics of this multidomain protein during its translocation cycle." @default.
• W2005280228 created "2016-06-24" @default.
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• W2005280228 date "2003-07-01" @default.
• W2005280228 modified "2023-10-16" @default.
• W2005280228 title "<i>Bacillus subtilis</i> SecA ATPase Exists as an Antiparallel Dimer in Solution" @default.
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• W2005280228 doi "https://doi.org/10.1021/bi0342057" @default.
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