6e7p

From Proteopedia

(Difference between revisions)

Current revision

cryo-EM structure of human TRPML1 with PI35P2

6e7p, resolution 3.50Å

Structural highlights

6e7p is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3.5Å
Ligands:
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

MCLN1_HUMAN Mucolipidosis type 4. The disease is caused by mutations affecting the gene represented in this entry.

Function

MCLN1_HUMAN Cation channel probably playing a role in the endocytic pathway and in the control of membrane trafficking of proteins and lipids. Could play a major role in Ca(2+) transport regulating lysosomal exocytosis.^[1] ^[2]

Publication Abstract from PubMed

Transient receptor potential mucolipin 1 (TRPML1), a lysosomal channel, maintains the low pH and calcium levels for lysosomal function. Several small molecules modulate TRPML1 activity. ML-SA1, a synthetic agonist, binds to the pore region and phosphatidylinositol-3,5-bisphosphate (PtdIns(3,5)P2), a natural lipid, stimulates channel activity to a lesser extent than ML-SA1; moreover, PtdIns(4,5)P2, another natural lipid, prevents TRPML1-mediated calcium release. Notably, PtdIns(3,5)P2 and ML-SA1 cooperate further increasing calcium efflux. Here we report the structures of human TRPML1 at pH 5.0 with PtdIns(3,5)P2, PtdIns(4,5)P2, or ML-SA1 and PtdIns(3,5)P2, revealing a unique lipid-binding site. PtdIns(3,5)P2 and PtdIns(4,5)P2 bind to the extended helices of S1, S2, and S3. The phosphate group of PtdIns(3,5)P2 induces Y355 to form a pi-cation interaction with R403, moving the S4-S5 linker, thus allosterically activating the channel. Our structures and electrophysiological characterizations reveal an allosteric site and provide molecular insight into how lipids regulate TRP channels.

, PMID:30305615^[3]

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

References

↑ LaPlante JM, Falardeau J, Sun M, Kanazirska M, Brown EM, Slaugenhaupt SA, Vassilev PM. Identification and characterization of the single channel function of human mucolipin-1 implicated in mucolipidosis type IV, a disorder affecting the lysosomal pathway. FEBS Lett. 2002 Dec 4;532(1-2):183-7. PMID:12459486
↑ Raychowdhury MK, Gonzalez-Perrett S, Montalbetti N, Timpanaro GA, Chasan B, Goldmann WH, Stahl S, Cooney A, Goldin E, Cantiello HF. Molecular pathophysiology of mucolipidosis type IV: pH dysregulation of the mucolipin-1 cation channel. Hum Mol Genet. 2004 Mar 15;13(6):617-27. Epub 2004 Jan 28. PMID:14749347 doi:http://dx.doi.org/10.1093/hmg/ddh067
↑ Fine M, Schmiege P, Li X. Structural basis for PtdInsP2-mediated human TRPML1 regulation. Nat Commun. 2018 Oct 10;9(1):4192. doi: 10.1038/s41467-018-06493-7. PMID:30305615 doi:http://dx.doi.org/10.1038/s41467-018-06493-7

1 Structural highlights
2 Disease
3 Function
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6e7p"

Categories: Homo sapiens | Large Structures | Li X | Schmiege P

@@ Line 1: / Line 1: @@
-'''Unreleased structure'''
-The entry 6e7p is ON HOLD  until Paper Publication
+==cryo-EM structure of human TRPML1 with PI35P2==
+<SX load='6e7p' size='340' side='right' viewer='molstar' caption='[[6e7p]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[6e7p]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6E7P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6E7P FirstGlance]. <br>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.5&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HZ7:[(2~{R})-2,3-bis[(1~{S})-1-oxidanyloctoxy]propyl]+[(2~{R},3~{S},5~{R},6~{R})-2,4,6-tris(oxidanyl)-3,5-diphosphonooxy-cyclohexyl]+hydrogen+phosphate'>HZ7</scene></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=6e7p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6e7p OCA], [https://pdbe.org/6e7p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6e7p RCSB], [https://www.ebi.ac.uk/pdbsum/6e7p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6e7p ProSAT]</span></td></tr>
+</table>
+== Disease ==
+[https://www.uniprot.org/uniprot/MCLN1_HUMAN MCLN1_HUMAN] Mucolipidosis type 4. The disease is caused by mutations affecting the gene represented in this entry.
+== Function ==
+[https://www.uniprot.org/uniprot/MCLN1_HUMAN MCLN1_HUMAN] Cation channel probably playing a role in the endocytic pathway and in the control of membrane trafficking of proteins and lipids. Could play a major role in Ca(2+) transport regulating lysosomal exocytosis.<ref>PMID:12459486</ref> <ref>PMID:14749347</ref>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Transient receptor potential mucolipin 1 (TRPML1), a lysosomal channel, maintains the low pH and calcium levels for lysosomal function. Several small molecules modulate TRPML1 activity. ML-SA1, a synthetic agonist, binds to the pore region and phosphatidylinositol-3,5-bisphosphate (PtdIns(3,5)P2), a natural lipid, stimulates channel activity to a lesser extent than ML-SA1; moreover, PtdIns(4,5)P2, another natural lipid, prevents TRPML1-mediated calcium release. Notably, PtdIns(3,5)P2 and ML-SA1 cooperate further increasing calcium efflux. Here we report the structures of human TRPML1 at pH 5.0 with PtdIns(3,5)P2, PtdIns(4,5)P2, or ML-SA1 and PtdIns(3,5)P2, revealing a unique lipid-binding site. PtdIns(3,5)P2 and PtdIns(4,5)P2 bind to the extended helices of S1, S2, and S3. The phosphate group of PtdIns(3,5)P2 induces Y355 to form a pi-cation interaction with R403, moving the S4-S5 linker, thus allosterically activating the channel. Our structures and electrophysiological characterizations reveal an allosteric site and provide molecular insight into how lipids regulate TRP channels.
-Authors: Schmiege, P., Li, X.
+,  PMID:30305615<ref>PMID:30305615</ref>
-Description: cryo-EM structure of human TRPML1 with PI35P2
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-[[Category: Unreleased Structures]]
+</div>
-[[Category: Schmiege, P]]
+<div class="pdbe-citations 6e7p" style="background-color:#fffaf0;"></div>
-[[Category: Li, X]]
+== References ==
+<references/>
+__TOC__
+</SX>
+[[Category: Homo sapiens]]
+[[Category: Large Structures]]
+[[Category: Li X]]
+[[Category: Schmiege P]]

6e7p

From Proteopedia

Current revision

cryo-EM structure of human TRPML1 with PI35P2

Structural highlights

Disease

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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