Cited by 111Cholesterol and Lipid MetabolismLipid Membrane Structure and BehaviorSteroid Chemistry and Biochemistry

The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.

Peripheral-Type Benzodiazepine Receptor Function in Cholesterol Transport. Identification of a Putative Cholesterol Recognition/Interaction Amino Acid Sequence and Consensus Pattern1

Li, Hua, Papadopoulos, Vassilios·1998·Endocrinology

Abstract

In steroid-synthesizing cells, like the MA-10 mouse tumor Leydig cells, the peripheral-type benzodiazepine receptor (PBR) is an outer mitochondrial membrane protein involved in the regulation of cholesterol transport from the outer to the inner mitochondrial membrane, the rate-determining step in steroid biosynthesis. Expression of PBR in Escherichia coli DE3 cells, which have no PBR, no cholesterol, and do not make steroids, induced the ability to take up cholesterol in a time-dependent, temperature-sensitive, and energy- independent manner. These cells took up no other steroids tested. Addition of the high affinity PBR ligand PK 11195 to cholesterol-loaded membranes, obtained from cells transfected with PBR, resulted in the release of the uptaken cholesterol. Expression in DE3 cells of mutant PBRs demonstrated that deletions in the cytoplasmic carboxy-terminus dramatically reduced the cholesterol uptake function of PBR, although it retained full capacity to bind PK 11195. Site-directed mutagenesis in the carboxy-terminal region of PBR demonstrated that bacteria expressing the mutant PBR proteins PBR(Y153S) and PBR(R156L) do not accumulate cholesterol, suggesting that amino acids Y153 and R156 are involved in the interaction of the receptor with cholesterol. Considering these results, we postulate the existence of a common cholesterol recognition/interaction amino acid consensus pattern (–L/V-(X)1–5-Y-(X)1–5-R/K-). Indeed, we found this amino acid consensus pattern in all proteins shown to interact with cholesterol. In conclusion, these data suggest that the expression of PBR confers the ability to take up and release, upon ligand activation, cholesterol. Considering the widespread occurrence of this protein and its tissue and cell specific subcellular localization, these results suggest a more general role of PBR in intracellular cholesterol transport and compartmentalization.

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Crossref · 10.1210/endo.139.12.6390

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  • TSPO contains an evolutionarily conserved C-terminal CRAC motif that facilitates cholesterol binding through a conserved tyrosine residue.

    “TSPO does contain an evolutionarily conserved C-terminal cholesterol recognition amino acid concensus (CRAC) motif (117, 118), which has been shown to facilitate cholesterol binding through a conserved tyrosine residue (119).”

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Metadata

Authors
Li, H., & Papadopoulos, V.
Affiliations
Georgetown University Medical Center (US)
Corresponding author
Li, Hua
Venue
Endocrinology
Published
1998-12
Volume
139
Issue
12
Pages
4991-4997
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W4239702608
Cited by
94
References
0
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 6 · 2022: 4 · 2021: 6 · 2020: 3 · 2018: 2 · 2017: 1 · 2016: 6 · 2015: 5 · 2014: 2 · 2013: 3 · 2012: 6
FWCI
1.57
Type
journal article
Language
en
Open access
closed
Locations
Endocrinology (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
  • Physical Sciences › Chemistry › Organic Chemistry › Steroid Chemistry and Biochemistry
Keywords
translocator protein (TSPO), cholesterol transport, steroidogenesis, mitochondrial outer membrane, MA-10 Leydig cells, PK11195, heterologous expression in Escherichia coli

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