1sor

From Proteopedia

Jump to: navigation, search

Aquaporin-0 membrane junctions reveal the structure of a closed water pore

Structural highlights

1sor is a 1 chain structure with sequence from Ovis aries. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron crystallography, Resolution 3Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MIP_SHEEP Water channel. May be responsible for regulating the osmolarity of the lens. Interactions between homotetramers from adjoining membranes may stabilize cell junctions in the eye lens core.[1] [2] [3]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The lens-specific water pore aquaporin-0 (AQP0) is the only aquaporin known to form membrane junctions in vivo. We show here that AQP0 from the lens core, containing some carboxy-terminally cleaved AQP0, forms double-layered crystals that recapitulate in vivo junctions. We present the structure of the AQP0 membrane junction as determined by electron crystallography. The junction is formed by three localized interactions between AQP0 molecules in adjoining membranes, mainly mediated by proline residues conserved in AQP0s from different species but not present in most other aquaporins. Whereas all previously determined aquaporin structures show the pore in an open conformation, the water pore is closed in AQP0 junctions. The water pathway in AQP0 also contains an additional pore constriction, not seen in other known aquaporin structures, which may be responsible for pore gating.

Aquaporin-0 membrane junctions reveal the structure of a closed water pore.,Gonen T, Sliz P, Kistler J, Cheng Y, Walz T Nature. 2004 May 13;429(6988):193-7. PMID:15141214[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Loading citation details..
Citations
reviews cite this structure
-1 more
other articles
No citations found

See Also

References

  1. ↑ Gonen T, Sliz P, Kistler J, Cheng Y, Walz T. Aquaporin-0 membrane junctions reveal the structure of a closed water pore. Nature. 2004 May 13;429(6988):193-7. PMID:15141214 doi:10.1038/nature02503
  2. ↑ Gonen T, Cheng Y, Kistler J, Walz T. Aquaporin-0 membrane junctions form upon proteolytic cleavage. J Mol Biol. 2004 Sep 24;342(4):1337-45. PMID:15351655 doi:http://dx.doi.org/10.1016/j.jmb.2004.07.076
  3. ↑ Hite RK, Li Z, Walz T. Principles of membrane protein interactions with annular lipids deduced from aquaporin-0 2D crystals. EMBO J. 2010 May 19;29(10):1652-8. Epub 2010 Apr 13. PMID:20389283 doi:10.1038/emboj.2010.68
  4. ↑ Gonen T, Sliz P, Kistler J, Cheng Y, Walz T. Aquaporin-0 membrane junctions reveal the structure of a closed water pore. Nature. 2004 May 13;429(6988):193-7. PMID:15141214 doi:10.1038/nature02503

Contents


PDB ID 1sor

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://proteopedia.org/wiki/index.php/1sor"
Personal tools