1d2j: Difference between revisions
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==LDL RECEPTOR LIGAND-BINDING MODULE 6== | |||
===LDL | <StructureSection load='1d2j' size='340' side='right' caption='[[1d2j]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1d2j]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1D2J OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1D2J FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene><br> | |||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ajj|1ajj]]</td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1d2j FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1d2j OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1d2j RCSB], [http://www.ebi.ac.uk/pdbsum/1d2j PDBsum]</span></td></tr> | |||
<table> | |||
== Disease == | |||
[[http://www.uniprot.org/uniprot/LDLR_HUMAN LDLR_HUMAN]] Defects in LDLR are the cause of familial hypercholesterolemia (FH) [MIM:[http://omim.org/entry/143890 143890]]; a common autosomal semi-dominant disease that affects about 1 in 500 individuals. The receptor defect impairs the catabolism of LDL, and the resultant elevation in plasma LDL-cholesterol promotes deposition of cholesterol in the skin (xanthelasma), tendons (xanthomas), and coronary arteries (atherosclerosis).<ref>PMID:3263645</ref> <ref>PMID:2569482</ref> <ref>PMID:3955657</ref> <ref>PMID:8347689</ref> <ref>PMID:2318961</ref> <ref>PMID:1446662</ref> <ref>PMID:1867200</ref> <ref>PMID:8462973</ref> <ref>PMID:8168830</ref> <ref>PMID:2726768</ref> <ref>PMID:1464748</ref> <ref>PMID:7573037</ref> <ref>PMID:7583548</ref> <ref>PMID:7550239</ref> <ref>PMID:7635461</ref> <ref>PMID:7635482</ref> <ref>PMID:7649546</ref> <ref>PMID:7649549</ref> <ref>PMID:8740918</ref> <ref>PMID:8664907</ref> <ref>PMID:9026534</ref> <ref>PMID:9254862</ref> <ref>PMID:9143924</ref> <ref>PMID:9259195</ref> <ref>PMID:9104431</ref> <ref>PMID:9654205</ref> <ref>PMID:9452094</ref> <ref>PMID:9452095</ref> <ref>PMID:9452118</ref> <ref>PMID:10206683</ref> <ref>PMID:10660340</ref> [:]<ref>PMID:9852677</ref> <ref>PMID:9678702</ref> <ref>PMID:10422803</ref> <ref>PMID:10090484</ref> <ref>PMID:10447263</ref> <ref>PMID:10978268</ref> <ref>PMID:10980548</ref> <ref>PMID:10882754</ref> <ref>PMID:11298688</ref> <ref>PMID:17142622</ref> <ref>PMID:19319977</ref> <ref>PMID:22160468</ref> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/LDLR_HUMAN LDLR_HUMAN]] Binds LDL, the major cholesterol-carrying lipoprotein of plasma, and transports it into cells by endocytosis. In order to be internalized, the receptor-ligand complexes must first cluster into clathrin-coated pits. In case of HIV-1 infection, functions as a receptor for extracellular Tat in neurons, mediating its internalization in uninfected cells. | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/d2/1d2j_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The low-density lipoprotein receptor (LDLR) is the primary mechanism for uptake of plasma cholesterol into cells and serves as a prototype for an entire class of cell surface receptors. The amino-terminal domain of the receptor consists of seven LDL-A modules; the third through the seventh modules all contribute to the binding of low-density lipoproteins (LDLs). Here, we present the NMR solution structure of the sixth LDL-A module (LR6) from the ligand binding domain of the LDLR. This module, which has little recognizable secondary structure, retains the essential structural features observed in the crystal structure of LDL-A module five (LR5) of the LDLR. Three disulfide bonds, a pair of buried residues forming a hydrophobic "mini-core", and a calcium-binding site that serves to organize the C-terminal lobe of the module all occupy positions in LR6 similar to those observed in LR5. The striking presence of a conserved patch of negative surface electrostatic potential among LDL-A modules of known structure suggests that ligand recognition by these repeats is likely to be mediated in part by electrostatic complementarity of receptor and ligand. Two variants of LR6, identified originally as familial hypercholesterolemia (FH) mutations, have been investigated for their ability to form native disulfide bonds under conditions that permit disulfide exchange. The first, E219K, lies near the amino-terminal end of LR6, whereas the second, D245E, alters one of the aspartate side chains that directly coordinate the bound calcium ion. After equilibration at physiologic calcium concentrations, neither E219K nor D245E folds to a unique disulfide isomer, indicating that FH mutations both within and distant from the calcium-binding site give rise to protein-folding defects. | |||
Solution structure of the sixth LDL-A module of the LDL receptor.,North CL, Blacklow SC Biochemistry. 2000 Mar 14;39(10):2564-71. PMID:10704205<ref>PMID:10704205</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
== | ==See Also== | ||
*[[LDL receptor|LDL receptor]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Blacklow, S C.]] | [[Category: Blacklow, S C.]] |
Revision as of 17:21, 29 September 2014
LDL RECEPTOR LIGAND-BINDING MODULE 6LDL RECEPTOR LIGAND-BINDING MODULE 6
Structural highlights
Disease[LDLR_HUMAN] Defects in LDLR are the cause of familial hypercholesterolemia (FH) [MIM:143890]; a common autosomal semi-dominant disease that affects about 1 in 500 individuals. The receptor defect impairs the catabolism of LDL, and the resultant elevation in plasma LDL-cholesterol promotes deposition of cholesterol in the skin (xanthelasma), tendons (xanthomas), and coronary arteries (atherosclerosis).[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [:][32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] Function[LDLR_HUMAN] Binds LDL, the major cholesterol-carrying lipoprotein of plasma, and transports it into cells by endocytosis. In order to be internalized, the receptor-ligand complexes must first cluster into clathrin-coated pits. In case of HIV-1 infection, functions as a receptor for extracellular Tat in neurons, mediating its internalization in uninfected cells. 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 PubMedThe low-density lipoprotein receptor (LDLR) is the primary mechanism for uptake of plasma cholesterol into cells and serves as a prototype for an entire class of cell surface receptors. The amino-terminal domain of the receptor consists of seven LDL-A modules; the third through the seventh modules all contribute to the binding of low-density lipoproteins (LDLs). Here, we present the NMR solution structure of the sixth LDL-A module (LR6) from the ligand binding domain of the LDLR. This module, which has little recognizable secondary structure, retains the essential structural features observed in the crystal structure of LDL-A module five (LR5) of the LDLR. Three disulfide bonds, a pair of buried residues forming a hydrophobic "mini-core", and a calcium-binding site that serves to organize the C-terminal lobe of the module all occupy positions in LR6 similar to those observed in LR5. The striking presence of a conserved patch of negative surface electrostatic potential among LDL-A modules of known structure suggests that ligand recognition by these repeats is likely to be mediated in part by electrostatic complementarity of receptor and ligand. Two variants of LR6, identified originally as familial hypercholesterolemia (FH) mutations, have been investigated for their ability to form native disulfide bonds under conditions that permit disulfide exchange. The first, E219K, lies near the amino-terminal end of LR6, whereas the second, D245E, alters one of the aspartate side chains that directly coordinate the bound calcium ion. After equilibration at physiologic calcium concentrations, neither E219K nor D245E folds to a unique disulfide isomer, indicating that FH mutations both within and distant from the calcium-binding site give rise to protein-folding defects. Solution structure of the sixth LDL-A module of the LDL receptor.,North CL, Blacklow SC Biochemistry. 2000 Mar 14;39(10):2564-71. PMID:10704205[44] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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