This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

5mug

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

Self-assembled alpha-Tocopherol Transfer Protein Nanoparticles Promote Vitamin E Delivery Across an Endothelial Barrier

Structural highlights

5mug is a 1 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:	X-ray diffraction, Resolution 2.42Å
Ligands:	, , ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

TTPA_HUMAN Defects in TTPA are the cause of ataxia with isolated vitamin E deficiency (AVED) [MIM:277460. AVED is an autosomal recessive disease characterized by spinocerebellar degeneration. It causes ataxia and peripheral neuropathy that resembles Friedreich ataxia. AVED patients have markedly reduced plasma levels of vitamin E.^[1] ^[2] ^[3] ^[4] ^[5] ^[6]

Function

TTPA_HUMAN Binds alpha-tocopherol and enhances its transfer between separate membranes.

Publication Abstract from PubMed

Vitamin E is one of the most important natural antioxidants, protecting polyunsaturated fatty acids in the membranes of cells. Among different chemical isoforms assimilated from dietary regimes, RRR-alpha-tocopherol is the only one retained in higher animals. This is possible thanks to alpha-Tocopherol Transfer Protein (alpha-TTP), which extracts alpha-tocopherol from endosomal compartments in liver cells, facilitating its distribution into the body. Here we show that, upon binding to its substrate, alpha-TTP acquires tendency to aggregation into thermodynamically stable high molecular weight oligomers. Determination of the structure of such aggregates by X-ray crystallography revealed a spheroidal particle formed by 24 protein monomers. Oligomerization is triggered by refolding of the N-terminus. Experiments with cultured cell monolayers demonstrate that the same oligomers are efficiently transported through an endothelial barrier (HUVEC) and not through an epithelial one (Caco-2). Discovery of a human endogenous transport protein with intrinsic capability of crossing endothelial tissues opens to new ways of drug delivery into the brain or other tissues protected by endothelial barriers.

Self-assembled alpha-Tocopherol Transfer Protein Nanoparticles Promote Vitamin E Delivery Across an Endothelial Barrier.,Aeschimann W, Staats S, Kammer S, Olieric N, Jeckelmann JM, Fotiadis D, Netscher T, Rimbach G, Cascella M, Stocker A Sci Rep. 2017 Jul 10;7(1):4970. doi: 10.1038/s41598-017-05148-9. PMID:28694484^[7]

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

References

↑ Hentati A, Deng HX, Hung WY, Nayer M, Ahmed MS, He X, Tim R, Stumpf DA, Siddique T, Ahmed. Human alpha-tocopherol transfer protein: gene structure and mutations in familial vitamin E deficiency. Ann Neurol. 1996 Mar;39(3):295-300. PMID:8602747 doi:http://dx.doi.org/10.1002/ana.410390305
↑ Cavalier L, Ouahchi K, Kayden HJ, Di Donato S, Reutenauer L, Mandel JL, Koenig M. Ataxia with isolated vitamin E deficiency: heterogeneity of mutations and phenotypic variability in a large number of families. Am J Hum Genet. 1998 Feb;62(2):301-10. PMID:9463307 doi:S0002-9297(07)63495-8
↑ Ouahchi K, Arita M, Kayden H, Hentati F, Ben Hamida M, Sokol R, Arai H, Inoue K, Mandel JL, Koenig M. Ataxia with isolated vitamin E deficiency is caused by mutations in the alpha-tocopherol transfer protein. Nat Genet. 1995 Feb;9(2):141-5. PMID:7719340 doi:http://dx.doi.org/10.1038/ng0295-141
↑ Gotoda T, Arita M, Arai H, Inoue K, Yokota T, Fukuo Y, Yazaki Y, Yamada N. Adult-onset spinocerebellar dysfunction caused by a mutation in the gene for the alpha-tocopherol-transfer protein. N Engl J Med. 1995 Nov 16;333(20):1313-8. PMID:7566022
↑ Morley S, Panagabko C, Shineman D, Mani B, Stocker A, Atkinson J, Manor D. Molecular determinants of heritable vitamin E deficiency. Biochemistry. 2004 Apr 13;43(14):4143-9. PMID:15065857 doi:10.1021/bi0363073
↑ Mariotti C, Gellera C, Rimoldi M, Mineri R, Uziel G, Zorzi G, Pareyson D, Piccolo G, Gambi D, Piacentini S, Squitieri F, Capra R, Castellotti B, Di Donato S. Ataxia with isolated vitamin E deficiency: neurological phenotype, clinical follow-up and novel mutations in TTPA gene in Italian families. Neurol Sci. 2004 Jul;25(3):130-7. PMID:15300460 doi:10.1007/s10072-004-0246-z
↑ Aeschimann W, Staats S, Kammer S, Olieric N, Jeckelmann JM, Fotiadis D, Netscher T, Rimbach G, Cascella M, Stocker A. Self-assembled alpha-Tocopherol Transfer Protein Nanoparticles Promote Vitamin E Delivery Across an Endothelial Barrier. Sci Rep. 2017 Jul 10;7(1):4970. doi: 10.1038/s41598-017-05148-9. PMID:28694484 doi:http://dx.doi.org/10.1038/s41598-017-05148-9

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/5mug"

Categories: Homo sapiens | Large Structures | Aeschimann W | Stocker A

@@ Line 1: / Line 1: @@
 ==Self-assembled alpha-Tocopherol Transfer Protein Nanoparticles Promote Vitamin E Delivery Across an Endothelial Barrier==
-<StructureSection load='5mug' size='340' side='right' caption='[[5mug]], [[Resolution|resolution]] 2.42&Aring;' scene=''>
+<StructureSection load='5mug' size='340' side='right'caption='[[5mug]], [[Resolution|resolution]] 2.42&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5mug]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5MUG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5MUG FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5mug]] is a 1 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=5MUG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5MUG FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=ETA:ETHANOLAMINE'>ETA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=VIV:(2R)-2,5,7,8-TETRAMETHYL-2-[(4R,8R)-4,8,12-TRIMETHYLTRIDECYL]CHROMAN-6-OL'>VIV</scene></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]] 2.42&#8491;</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TTPA, TPP1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=ETA:ETHANOLAMINE'>ETA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=VIV:(2R)-2,5,7,8-TETRAMETHYL-2-[(4R,8R)-4,8,12-TRIMETHYLTRIDECYL]CHROMAN-6-OL'>VIV</scene></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=5mug FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mug OCA], [http://pdbe.org/5mug PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5mug RCSB], [http://www.ebi.ac.uk/pdbsum/5mug PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5mug ProSAT]</span></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=5mug FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mug OCA], [https://pdbe.org/5mug PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5mug RCSB], [https://www.ebi.ac.uk/pdbsum/5mug PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5mug ProSAT]</span></td></tr>
 </table>
 == Disease ==
-[[http://www.uniprot.org/uniprot/TTPA_HUMAN TTPA_HUMAN]] Defects in TTPA are the cause of ataxia with isolated vitamin E deficiency (AVED) [MIM:[http://omim.org/entry/277460 277460]]. AVED is an autosomal recessive disease characterized by spinocerebellar degeneration. It causes ataxia and peripheral neuropathy that resembles Friedreich ataxia. AVED patients have markedly reduced plasma levels of vitamin E.<ref>PMID:8602747</ref> <ref>PMID:9463307</ref> <ref>PMID:7719340</ref> <ref>PMID:7566022</ref> <ref>PMID:15065857</ref> <ref>PMID:15300460</ref>
+[https://www.uniprot.org/uniprot/TTPA_HUMAN TTPA_HUMAN] Defects in TTPA are the cause of ataxia with isolated vitamin E deficiency (AVED) [MIM:[https://omim.org/entry/277460 277460]. AVED is an autosomal recessive disease characterized by spinocerebellar degeneration. It causes ataxia and peripheral neuropathy that resembles Friedreich ataxia. AVED patients have markedly reduced plasma levels of vitamin E.<ref>PMID:8602747</ref> <ref>PMID:9463307</ref> <ref>PMID:7719340</ref> <ref>PMID:7566022</ref> <ref>PMID:15065857</ref> <ref>PMID:15300460</ref>
 == Function ==
-[[http://www.uniprot.org/uniprot/TTPA_HUMAN TTPA_HUMAN]] Binds alpha-tocopherol and enhances its transfer between separate membranes.
+[https://www.uniprot.org/uniprot/TTPA_HUMAN TTPA_HUMAN] Binds alpha-tocopherol and enhances its transfer between separate membranes.
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 25: / Line 25: @@
 __TOC__
 </StructureSection>
-[[Category: Human]]
+[[Category: Homo sapiens]]
-[[Category: Aeschimann, W]]
+[[Category: Large Structures]]
-[[Category: Stocker, A]]
+[[Category: Aeschimann W]]
-[[Category: Lipid transfer protein]]
+[[Category: Stocker A]]
-[[Category: Sec14-like]]
-[[Category: Transport protein]]

5mug

From Proteopedia

Current revision

Self-assembled alpha-Tocopherol Transfer Protein Nanoparticles Promote Vitamin E Delivery Across an Endothelial Barrier

Structural highlights

Disease

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox