Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 292, Issue 21, Pages 8811-8822Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M116.761718
Keywords
cholesterol; cholesterol metabolism; cholesterol regulation; cholesterol-binding protein; enzyme
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Funding
- Academy of Finland [263371, 266992, 272130, 284667]
- EU FP7 program [ERC-2013-ADG-340233]
- Academy of Finland (AKA) [284667, 266992, 263371, 284667, 266992, 263371] Funding Source: Academy of Finland (AKA)
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Cholesterol oxidase (COase) is a bacterial enzyme catalyzing the first step in the biodegradation of cholesterol. COase is an important biotechnological tool for clinical diagnostics and production of steroid drugs and insecticides. It is also used for tracking intracellular cholesterol; however, its utility is limited by the lack of an efficient temporal control of its activity. To overcome this we have developed a regulatable fragment complementation system for COase cloned from Chromobacterium sp. The enzyme was split into two moieties that were fused to FKBP (FK506-binding protein) and FRB (rapamycin-binding domain) pair and split GFP fragments. The addition of rapamycin reconstituted a fluorescent enzyme, termed split GFP-COase, the fluorescence level of which correlated with its oxidation activity. A rapid decrease of cellular cholesterol induced by intracellular expression of the split GFP-COase promoted the dissociation of a cholesterol biosensor D4H from the plasma membrane. The process was reversible as upon rapamycin removal, the split GFP-COase fluorescence was lost, and cellular cholesterol levels returned to normal. These data demonstrate that the split GFP-COase provides a novel tool to manipulate cholesterol in mammalian cells.
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