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• W2955355888 abstract "The transmembrane (TM) anchors of cell surface proteins have been one of the ‘blind spots’ in structural biology because they are generally very hydrophobic, sometimes dynamic, and thus difficult targets for structural characterization. A plethora of examples show these membrane anchors are not merely anchors but can multimerize specifically to activate signaling receptors on the cell surface or to stabilize envelope proteins in viruses. Through a series of studies of the TM domains (TMDs) of immune receptors and viral membrane proteins, we have established a robust protocol for determining atomic-resolution structures of TM oligomers by NMR in bicelles that closely mimic a lipid bilayer. Our protocol overcomes hurdles typically encountered by structural biology techniques such as X-ray crystallography and cryo-electron microscopy (cryo-EM) when studying small TMDs. Here, we provide the details of the protocol, covering five major technical aspects: (i) a general method for producing isotopically labeled TM or membrane-proximal (MP) protein fragments that involves expression of the protein (which is fused to TrpLE) into inclusion bodies and releasing the target protein by cyanogen bromide (CNBr) cleavage; (ii) determination of the oligomeric state of TMDs in bicelles; (iii) detection of intermolecular contacts using nuclear Overhauser effect (NOE) experiments; (iv) structure determination; and (v) paramagnetic probe titration (PPT) to characterize the membrane partition of the TM oligomers. This protocol is broadly applicable for filling structural gaps of many type I/II membrane proteins. The procedures may take 3–6 months to complete, depending on the complexity and stability of the protein sample. The transmembrane domains of many type I/II membrane proteins oligomerize in the lipid bilayer, mediating protein assembly and clustering that are critical to their function. The authors provide a general protocol for determining the structures of these domains in a near–lipid bilayer environment." @default.
• W2955355888 created "2019-07-12" @default.
• W2955355888 creator A5005592572 @default.
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• W2955355888 date "2019-07-03" @default.
• W2955355888 modified "2023-10-16" @default.
• W2955355888 title "Structure determination protocol for transmembrane domain oligomers" @default.
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• W2955355888 doi "https://doi.org/10.1038/s41596-019-0188-9" @default.
• W2955355888 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7238434" @default.
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