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Probing Polytopic Membrane Protein - Substrate Interactions by Luminescence Resonance Energy Transfer #MMPMID26918528
Musial-Siwek M; Jaffee MB; Imperiali B
J Am Chem Soc 2016[Mar]; 138 (11): 3806-12 PMID26918528show ga
Integral membrane proteins play essential roles in all living systems; however, major technical hurdles challenge analyses of this class of proteins. Biophysical approaches that provide structural information to complement and leverage experimentally-determined and computationally-predicted structures are urgently needed. Herein we present the application of luminescence resonance energy transfer (LRET) for investigating the interactions of the polytopic membrane-bound oligosaccharyl transferases (OTases) with partner substrates. Monomeric OTases, such as the PglBs from Campylobacter jejuni and C. lari catalyze transfer of glycans from membrane?associated undecaprenol diphosphate-linked substrates to proteins in the bacterial periplasm. LRET-based distance measurements are enabled by the inclusion of an encoded N-terminal lanthanide-binding tags (LBTs), and LRET between the luminescent (LBT)-Tb3+ donor complex and fluorescently-labeled peptide and glycan substrates, provides discrete distance measurements across the span of the membrane. LRET-based measurements of detergent-solubilized PglB from C. lari allowed direct comparison with the distances based on the previously reported the C. lari PglB crystal structure, thereby validating the approach in a defined system. Distance measurements between peptide and glycan substrates and the C. jejuni PglB offer new experimental information on substrate binding to the related, but structurally uncharacterized, OTase.