Structure-based analysis of CysZ-mediated cellular uptake of sulfate.

Publication Type:

Journal Article

Source:

Elife, Volume 7 (2018)

Abstract:

<p>Sulfur, most abundantly found in the environment as sulfate (SO), is an essential element in metabolites required by all living cells, including amino acids, co-factors and vitamins. However, current understanding of the cellular delivery of SO at the molecular level is limited. CysZ has been described as a SO permease, but its sequence family is without known structural precedent. Based on crystallographic structure information, SO binding and flux experiments, we provide insight into the molecular mechanism of CysZ-mediated translocation of SO across membranes. CysZ structures from three different bacterial species display a hitherto unknown fold and have subunits organized with inverted transmembrane topology. CysZ from assembles as a trimer of antiparallel dimers and the CysZ structures from two other species recapitulate dimers from this assembly. Mutational studies highlight the functional relevance of conserved CysZ residues.</p>

PDB: 
Pseudomonas fragi CysZ: 6D79, Pseudomonas denitrificans CysZ: 6D9Z.
Detector: 
PILATUS
Beamline: 
24-ID-C