|
|
| (One intermediate revision not shown.) |
| Line 1: |
Line 1: |
| | | | |
| | ==Crystal structure of the second StARkin domain of Lam4== | | ==Crystal structure of the second StARkin domain of Lam4== |
| - | <StructureSection load='5yqp' size='340' side='right' caption='[[5yqp]], [[Resolution|resolution]] 1.70Å' scene=''> | + | <StructureSection load='5yqp' size='340' side='right'caption='[[5yqp]], [[Resolution|resolution]] 1.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5yqp]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YQP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5YQP FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5yqp]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YQP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5YQP FirstGlance]. <br> |
| - | </td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5yqp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yqp OCA], [http://pdbe.org/5yqp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5yqp RCSB], [http://www.ebi.ac.uk/pdbsum/5yqp PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5yqp ProSAT]</span></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7Å</td></tr> |
| | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5yqp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yqp OCA], [https://pdbe.org/5yqp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5yqp RCSB], [https://www.ebi.ac.uk/pdbsum/5yqp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5yqp ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/LAM4_YEAST LAM4_YEAST]] May be involved in sterol transfer between intracellular membranes.<ref>PMID:26001273</ref> | + | [https://www.uniprot.org/uniprot/LAM4_YEAST LAM4_YEAST] May be involved in sterol transfer between intracellular membranes.<ref>PMID:26001273</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
| Line 21: |
Line 22: |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: IM, Y J]] | + | [[Category: Large Structures]] |
| - | [[Category: Manik, K M]] | + | [[Category: Saccharomyces cerevisiae S288C]] |
| - | [[Category: Tong, J]] | + | [[Category: IM YJ]] |
| - | [[Category: Lam4]] | + | [[Category: Manik KM]] |
| - | [[Category: Ligand binding domain]] | + | [[Category: Tong J]] |
| - | [[Category: Lipid transport]]
| + | |
| - | [[Category: Ltc3]]
| + | |
| - | [[Category: Starkin]]
| + | |
| - | [[Category: Sterol]]
| + | |
| - | [[Category: Transport protein]]
| + | |
| Structural highlights
Function
LAM4_YEAST May be involved in sterol transfer between intracellular membranes.[1]
Publication Abstract from PubMed
Membrane contact sites (MCSs) in eukaryotic cells are hotspots for lipid exchange, which is essential for many biological functions, including regulation of membrane properties and protein trafficking. Lipid transfer proteins anchored at membrane contact sites (LAMs) contain sterol-specific lipid transfer domains [StARkin domain (SD)] and multiple targeting modules to specific membrane organelles. Elucidating the structural mechanisms of targeting and ligand recognition by LAMs is important for understanding the interorganelle communication and exchange at MCSs. Here, we determined the crystal structures of the yeast Lam6 pleckstrin homology (PH)-like domain and the SDs of Lam2 and Lam4 in the apo form and in complex with ergosterol. The Lam6 PH-like domain displays a unique PH domain fold with a conserved N-terminal alpha-helix. The Lam6 PH-like domain lacks the basic surface for phosphoinositide binding, but contains hydrophobic patches on its surface, which are critical for targeting to endoplasmic reticulum (ER)-mitochondrial contacts. Structures of the LAM SDs display a helix-grip fold with a hydrophobic cavity and a flexible Omega1-loop as a lid. Ergosterol is bound to the pocket in a head-down orientation, with its hydrophobic acyl group located in the tunnel entrance. The Omega1-loop in an open conformation is essential for ergosterol binding by direct hydrophobic interaction. Structural comparison suggested that the sterol binding mode of the Lam2 SD2 is likely conserved among the sterol transfer proteins of the StARkin superfamily. Structural models of full-length Lam2 correlated with the sterol transport function at the membrane contact sites.
Structural basis of sterol recognition and nonvesicular transport by lipid transfer proteins anchored at membrane contact sites.,Tong J, Manik MK, Im YJ Proc Natl Acad Sci U S A. 2018 Jan 16. pii: 1719709115. doi:, 10.1073/pnas.1719709115. PMID:29339490[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Gatta AT, Wong LH, Sere YY, Calderon-Norena DM, Cockcroft S, Menon AK, Levine TP. A new family of StART domain proteins at membrane contact sites has a role in ER-PM sterol transport. Elife. 2015 May 22;4. doi: 10.7554/eLife.07253. PMID:26001273 doi:http://dx.doi.org/10.7554/eLife.07253
- ↑ Tong J, Manik MK, Im YJ. Structural basis of sterol recognition and nonvesicular transport by lipid transfer proteins anchored at membrane contact sites. Proc Natl Acad Sci U S A. 2018 Jan 16. pii: 1719709115. doi:, 10.1073/pnas.1719709115. PMID:29339490 doi:http://dx.doi.org/10.1073/pnas.1719709115
|
