2P4E image
Entry Detail
PDB ID:
2P4E
Keywords:
Title:
Crystal Structure of PCSK9
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2007-03-12
Release Date:
2007-04-10
Method Details:
Experimental Method:
Resolution:
1.98 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Proprotein convertase subtilisin/kexin type 9
Chain IDs:A (auth: P), B (auth: A)
Chain Length:692
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural and biophysical studies of PCSK9 and its mutants linked to familial hypercholesterolemia.
Nat.Struct.Mol.Biol. 14 413 419 (2007)
PMID: 17435765 DOI: 10.1038/nsmb1235

Abstact

Proprotein convertase subtilisin kexin type 9 (PCSK9) lowers the abundance of surface low-density lipoprotein (LDL) receptor through an undefined mechanism. The structure of human PCSK9 shows the subtilisin-like catalytic site blocked by the prodomain in a noncovalent complex and inaccessible to exogenous ligands, and that the C-terminal domain has a novel fold. Biosensor studies show that PCSK9 binds the extracellular domain of LDL receptor with K(d) = 170 nM at the neutral pH of plasma, but with a K(d) as low as 1 nM at the acidic pH of endosomes. The D374Y gain-of-function mutant, associated with hypercholesterolemia and early-onset cardiovascular disease, binds the receptor 25 times more tightly than wild-type PCSK9 at neutral pH and remains exclusively in a high-affinity complex at the acidic pH. PCSK9 may diminish LDL receptors by a mechanism that requires direct binding but not necessarily receptor proteolysis.

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Primary Citation of related structures