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1d2j

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[[Image:1d2j.gif|left|200px]]
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{{Seed}}
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[[Image:1d2j.png|left|200px]]
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{{STRUCTURE_1d2j| PDB=1d2j | SCENE= }}
{{STRUCTURE_1d2j| PDB=1d2j | SCENE= }}
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'''LDL RECEPTOR LIGAND-BINDING MODULE 6'''
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===LDL RECEPTOR LIGAND-BINDING MODULE 6===
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==Overview==
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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.
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The line below this paragraph, {{ABSTRACT_PUBMED_10704205}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 10704205 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10704205}}
==About this Structure==
==About this Structure==
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1D2J is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1D2J OCA].
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1D2J is a [[Single protein]] structure of 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].
==Reference==
==Reference==
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[[Category: Ldlr]]
[[Category: Ldlr]]
[[Category: Receptor]]
[[Category: Receptor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:22:33 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:12:09 2008''

Revision as of 19:12, 30 June 2008

Image:1d2j.png

Template:STRUCTURE 1d2j

LDL RECEPTOR LIGAND-BINDING MODULE 6

Template:ABSTRACT PUBMED 10704205

About this Structure

1D2J is a Single protein structure of sequence from Homo sapiens. Full experimental information is available from OCA.

Reference

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

Page seeded by OCA on Mon Jun 30 22:12:09 2008

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