3PGU

Phe3Glu mutant of EcFadL

Summary for 3PGU

• Entry DOI: 10.2210/pdb3pgu/pdb
• Related: 1T16 1T1L
• Descriptor: Long-chain fatty acid transport protein, (HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE, NONAETHYLENE GLYCOL, ... (7 entities in total)
• Functional Keywords: outer membrane beta barrel, lipid transport, outer membrane
• Biological source: Escherichia coli K-12
• Cellular location: Cell outer membrane ; Multi-pass membrane protein : P10384
• Total number of polymer chains: 1
• Total formula weight: 52728.36

Authors

Lepore, B.W.,Indic, M.,Pham, H.,Hearn, E.,Patel, D.,van den Berg, B. (deposition date: 2010-11-02, release date: 2011-05-25, Last modification date: 2023-09-06)

Primary citation

Lepore, B.W.,Indic, M.,Pham, H.,Hearn, E.M.,Patel, D.R.,van den Berg, B.
From the Cover: Ligand-gated diffusion across the bacterial outer membrane.
Proc.Natl.Acad.Sci.USA, 108:10121-10126, 2011

PubMed Abstract: Ligand-gated channels, in which a substrate transport pathway is formed as a result of the binding of a small-molecule chemical messenger, constitute a diverse class of membrane proteins with important functions in prokaryotic and eukaryotic organisms. Despite their widespread nature, no ligand-gated channels have yet been found within the outer membrane (OM) of Gram-negative bacteria. Here we show, using in vivo transport assays, intrinsic tryptophan fluorescence and X-ray crystallography, that high-affinity (submicromolar) substrate binding to the OM long-chain fatty acid transporter FadL from Escherichia coli causes conformational changes in the N terminus that open up a channel for substrate diffusion. The OM long-chain fatty acid transporter FadL from E. coli is a unique paradigm for OM diffusion-driven transport, in which ligand gating within a β-barrel membrane protein is a prerequisite for channel formation.

PubMed: 21593406
DOI: 10.1073/pnas.1018532108

Experimental method

X-RAY DIFFRACTION (1.7 Å)