8AXW image
Entry Detail
PDB ID:
8AXW
Keywords:
Title:
The structure of mouse AsterC (GramD1c) with Ezetimibe
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-09-01
Release Date:
2023-09-13
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.20
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Protein Aster-C
Chain IDs:A
Chain Length:224
Number of Molecules:1
Biological Source:Mus musculus
Primary Citation

Abstact

Intestinal absorption is an important contributor to systemic cholesterol homeostasis. Niemann-Pick C1 Like 1 (NPC1L1) assists in the initial step of dietary cholesterol uptake, but how cholesterol moves downstream of NPC1L1 is unknown. We show that Aster-B and Aster-C are critical for nonvesicular cholesterol movement in enterocytes. Loss of NPC1L1 diminishes accessible plasma membrane (PM) cholesterol and abolishes Aster recruitment to the intestinal brush border. Enterocytes lacking Asters accumulate PM cholesterol and show endoplasmic reticulum cholesterol depletion. Aster-deficient mice have impaired cholesterol absorption and are protected against diet-induced hypercholesterolemia. Finally, the Aster pathway can be targeted with a small-molecule inhibitor to manipulate cholesterol uptake. These findings identify the Aster pathway as a physiologically important and pharmacologically tractable node in dietary lipid absorption.

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