The Structural Basis for Glycerol Permeation by human AQP7

Human glycerol channel AQP7 conducts glycerol release from adipocyte and entry into the cells in pancreatic islets, muscles and kidney tubule, and thus regulate glycerol metabolism in those tissues. Compared with other human aquaglyceroporins, AQP7 shows a less conserved “NPA” motif in the center cavity, and a pair of aromatic residues at Ar/R selectivity filter. To understand the structural basis for the glycerol conductance, we crystallized the human AQP7 and determined the structure at 3.7 Å. A substrate binding pocket was found near to the Ar/R filter and the bound glycerol molecule stabilized by R229. In vivo functional assay on human AQP7 as well as AQP3 and AQP10 demonstrated strong glycerol transportation activities at physiological condition. The human AQP7 structure reveals a fully closed conformation with its permeation pathway strictly confined by Ar/R filter at the exoplasmic side and the gate at the cytoplasmic side, and the dislocation of the residues at narrowest parts of glycerol pathway in AQP7 play a critical role in controlling the glycerol flux.

• Publication year

  2019

• Venue

  bioRxiv

• Publication date

  2019-11-29

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1101/858332PMID 36654284
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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