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An Alkyne-Containing Isoprenoid Analogue Based on a Farnesyl Diphosphate Scaffold Is a Biologically Functional
Shelby A Auger1, Jodi S Pedersen1, Sanjay Maity1
1Department of Chemistry, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455, United States.
Biochemistry
|December 9, 2024
Summary
Metabolic labeling probes identify prenylated proteins. C15AlkOPP is a versatile tool for studying protein prenylation, accurately localizing H-Ras and complementing geranylgeranyl diphosphate (GGPP) depletion effects.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Protein prenylation involves modifying proteins with farnesyl diphosphate (FPP) or geranylgeranyl diphosphate (GGPP).
- Metabolic labeling using alkyne-containing isoprenoid analogs, like C15AlkOPP, aids in identifying prenylated proteins and tracking their levels in disease states.
Purpose of the Study:
- To systematically investigate the impact of isoprenoid chain length on protein labeling efficiency and selectivity.
- To evaluate novel isoprenoid analogs for their utility in metabolic labeling studies of protein prenylation.
Main Methods:
- Chemical synthesis of new isoprenoid analogs (C15hAlkOPP, C20AlkOPP).
- In vitro enzyme kinetics assays.
- In cellulo metabolic labeling experiments.
- Functional assays including H-Ras localization and complementation of GGPP depletion effects.
Main Results:
- Eight isoprenoid analogs were synthesized and tested, including C10AlkOPP, C15AlkOPP, C15hAlkOPP, and C20AlkOPP.
- C15AlkOPP identified the largest number of prenylated proteins (70), encompassing all prenylation classes.
- C10AlkOPP showed selectivity for farnesylated proteins, while C20AlkOPP was selective for geranylgeranylated proteins.
- C15AlkOPP demonstrated efficient cellular incorporation, correct H-Ras plasma membrane localization, and functional complementation of GGPP depletion.
Conclusions:
- C15AlkOPP is a biologically functional and universal probe for metabolic labeling of prenylated proteins.
- This probe exhibits minimal impact on cellular physiology, making it suitable for diverse biological studies.
- The study provides a comprehensive analysis of isoprenoid length effects on metabolic labeling probes for protein prenylation.
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