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• W2117345265 abstract "The yeast Saccharomyces cerevisiae undergoes cell fusion during sexual conjugation to form diploid cells. The haploids participating in this process signal each other through secreted peptide-mating factors (alpha-factor and a-factor) that are recognized by G-protein-coupled receptors. The receptor (Ste2p) recognizing the tridecapeptide alpha-factor is used as a model system in our laboratory to understand various aspects of peptide-receptor interactions and receptor structure. Using chemical procedures we have synthesized peptides corresponding to the seven transmembrane domains of Ste2p and studied their structures in membrane mimetic environments. Extension of these studies requires preparation of longer fragments of Ste2p. This article discusses strategies used in our laboratory to prepare peptides containing multiple domains of Ste2p. Data are presented on the use of chemical synthesis, biosynthesis, and native chemical ligation. Using biosynthetic approaches fusion proteins have been expressed that contain single receptor domains, two transmembrane domains connected by the contiguous loop, and the tail connected to the seventh transmembrane domain. Tens of milligrams of fusion protein were obtained per liter, and multimilligram quantities of the isotopically labeled target peptides were isolated using such biosynthetic approaches. Initial circular dichroism results on a chemically synthesized 64-residue peptide containing a portion of the cytosolic tail and the complete seventh transmembrane domain showed that the tail portion and the hydrophobic core of this peptide maintained individual conformational preferences. Moreover, this peptide could be studied at near millimolar concentrations in the presence of micelles and did not aggregate under these conditions. Thus, these constructs can be investigated using high-resolution nuclear magnetic resonance techniques, and the cytosolic tail of Ste2p can be used as a hydrophilic template to improve solubility of transmembrane peptides for structural analysis." @default.
• W2117345265 created "2016-06-24" @default.
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• W2117345265 date "2004-01-01" @default.
• W2117345265 modified "2023-10-09" @default.
• W2117345265 title "Sexual conjugation in yeast: A paradigm to study G-protein-coupled receptor domain structure" @default.
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• W2117345265 doi "https://doi.org/10.1002/bip.10567" @default.
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