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• W2009289009 abstract "Ligand-binding-induced conformational changes in the Salmonella typhimurium aspartate receptor were studied using spin-labeling electron paramagnetic resonance. Cysteine residues, introduced by site-directed mutagenesis at several positions in the aspartate receptor periplasmic domain, were used to attach covalently a thiol-specific spin label. The electron paramagnetic resonance spectra of these labeled proteins were obtained in the presence and absence of the ligand aspartate, and used to calculate the distance change between spin labels. The results support a model in which transmembrane signaling is executed by a combined movement of α helix 4 (which leads into transmembrane domain 2) relative to α helix 1 (connected to transmembrane domain 1), as well as a coming together of the two subunits. Ligand binding causes spin labels at position 39 and 179 (within one subunit) to move further from each other and spin labels at position 39 and 39‘ (between two subunits) to move closer to each other. Both of these changes are very smallless than 2.5 Å. No similar changes were detected in any aspartate receptor samples solubilized in detergent, suggesting that the membrane is required for these conformational changes. This is the first case of physically measured ligand-induced changes in a full-length 1−2 transmembrane domain receptor, and the results suggest that very small ligand-induced movements can result in large effects on the activity of downstream proteins." @default.
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• W2009289009 date "1998-05-01" @default.
• W2009289009 modified "2023-09-27" @default.
• W2009289009 title "Direct Measurement of Small Ligand-Induced Conformational Changes in the Aspartate Chemoreceptor Using EPR" @default.
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• W2009289009 doi "https://doi.org/10.1021/bi980305e" @default.
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