Organization of the aerotaxis receptor aer in the membrane of Escherichia coli.
The Aer receptor guides Escherichia coli to specific oxygen and energy-generating niches. The input sensor in Aer is a flavin adenine dinucleotide-binding PAS domain, which is separated from a HAMP/signaling output domain by two membrane-spanning segments that flank a short (four-amino-acid) periplasmic loop. In this study, we determined the overall membrane organization of Aer by introducing combinations of residues that allowed us to differentiate intradimeric collisions from interdimeric collisions. Collisions between proximal residues in the membrane anchor were exclusively intra- or interdimeric but, with one exception, not both. Cross-linking profiles were consistent, with a rigid rather than flexible periplasmic loop and a tilted TM2 helix that crossed TM2' at residue V197C, near the center of the lipid bilayer. The periplasmic loop formed a stable neighborhood that (i) included a maximum of three Aer dimers, (ii) did not swap neighbors over time, and (iii) appeared to be constrained by interactions in the cytosolic signaling domain.
Amin
Divya N
DN
Division of Microbiology and Molecular Genetics, Loma Linda University, Loma Linda, CA 92350, USA.
Taylor
Barry L
BL
Johnson
Mark S
MS
D002352:Carrier Proteins / Q000737:chemistry* / Q000378:metabolism*; D002462:Cell Membrane / Q000737:chemistry*; D004926:Escherichia coli / Q000737:chemistry*; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000378:metabolism*; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism; D046912:Multiprotein Complexes / Q000737:chemistry / Q000378:metabolism; D016297:Mutagenesis, Site-Directed; D011485:Protein Binding; D025941:Protein Interaction Mapping; D020836:Protein Structure, Quaternary; D017433:Protein Structure, Secondary
C108679:Aer protein, E coli; D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D046912:Multiprotein Complexes
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