7DJ2 image
Entry Detail
PDB ID:
7DJ2
Title:
Crystal structure of the G26C/E290S mutant of LeuT
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-11-19
Release Date:
2021-04-07
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.23
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Na(+):neurotransmitter symporter (Snf family)
Mutations:G26C/E290S
Chain IDs:A, B
Chain Length:513
Number of Molecules:2
Biological Source:Aquifex aeolicus
Primary Citation
Crystal structures of LeuT reveal conformational dynamics in the outward-facing states.
J.Biol.Chem. 296 100609 100609 (2021)
PMID: 33811858 DOI: 10.1016/j.jbc.2021.100609

Abstact

The neurotransmitter:sodium symporter (NSS) homolog LeuT from Aquifex aeolicus has proven to be a valuable model for studying the transport mechanism of the NSS family. Crystal structures have captured LeuT in key conformations visited during the transport cycle, allowing for the construction of a nearly complete model of transport, with much of the conformational dynamics studied by computational simulations. Here, we report crystal structures of LeuT representing new intermediate conformations between the outward-facing open and occluded states. These structures, combined with binding and accessibility studies, reveal details of conformational dynamics that can follow substrate binding at the central substrate binding site (S1) of LeuT in outward-facing states, suggesting a potential competition for direction between the outward-open and outward-occluded states at this stage during substrate transport. Our structures further support an intimate interplay between the protonation state of Glu290 and binding of Na1 that may ultimately regulate the outward-open-to-occluded transition.

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