Probing receptor-translocator interactions in the oligopeptide ABC transporter by fluorescence correlation spectroscopy.

Biophysical Journal
Mark K DoevenBert Poolman

Abstract

The oligopeptide transporter Opp is a five-component ABC uptake system. The extracytoplasmic lipid-anchored substrate-binding protein (or receptor) OppA delivers peptides to an integral membrane complex OppBCDF (or translocator), where, on ATP binding and hydrolysis, translocation across the membrane takes place. OppA and OppBCDF were labeled with fluorescent probes, reconstituted into giant unilamellar vesicles, and the receptor-translocator interactions were investigated by fluorescence correlation spectroscopy. Lateral mobility of OppA was reduced on incorporation of OppBCDF into giant unilamellar vesicles, and decreased even further on the addition of peptide. Fluorescence cross-correlation measurements revealed that OppBCDF distinguished liganded from unliganded OppA, binding only the former. Addition of ATP or its nonhydrolyzable analog AMP-PNP resulted in release of OppA from OppBCDF. In vanadate-trapped "transition state" conditions, OppA also was not bound by OppBCDF. A model is presented in which ATP-binding to OppDF results in donation of peptide to OppBC and simultaneous release of OppA. ATP-hydrolysis would complete the peptide translocation and reset the transporter for another catalytic cycle. Implications in ter...Continue Reading

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Citations

Mar 21, 2013·Proceedings of the National Academy of Sciences of the United States of America·Elena VigonskyOded Lewinson
Mar 17, 2011·PloS One·Scot P OuelletteRey A Carabeo
May 13, 2011·European Journal of Cell Biology·Erwin SchneiderWolfram Saenger
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Oct 28, 2016·Bioresource Technology·Pablo FuentealbaClaudia Altamirano
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Aug 4, 2019·Research in Microbiology·Leyla Slamti, Didier Lereclus
Sep 21, 2019·Biophysical Journal·Marijn de BoerThorben Cordes

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