Multidrug resistance is a serious threat to public health. Proton motive force-driven antiporters from the major facilitator superfamily (MFS) constitute a major group of multidrug-resistance transporters. Currently, no reports on crystal structures of MFS antiporters in complex with their substrates exist. The E. coli MdfA transporter is a well-studied model system for biochemical analyses of multidrug-resistance MFS antiporters. Here, we report three crystal structures of MdfA-ligand complexes at resolutions up to 2.0 ?, all in the inward-facing conformation. The substrate-binding site sits proximal to the conserved acidic residue, D34. Our mutagenesis studies support the structural observations of the substrate-binding mode and the notion that D34 responds to substrate binding by adjusting its protonation status. Taken together, our data unveil the substrate-binding mode of MFS antiporters and suggest a mechanism of transport via this group of transporters.
Medicilon's fluorescent probes and labeling platforms can provide fluorescent probe design and synthesis services for scientific institutions, drug R&D companies, and other customers. Design and synthesis steps Fluorescent probes are tools used to detect, measure and analyze biomolecules, cells and tissues. They achieve these purposes by emitting and receiving fluorescent signals. Medicilon can complete the design and synthesis of fluorescent probes for biomolecules. Selection of target molecules and determination of target. Selection of fluorescent dyes. Design of molecular structure. Synthesize probe molecules. Testing the properties of probe molecules. Custom synthesis Medicilon's fluorescent probes and labeling platforms can provide fluorescent probe design and synthesis services for scientific institutions, drug R&D companies, and other customers. After years of development, Medicilon's fluorescent probes and labeling platforms have accumulated rich experience...
评论
发表评论