Abstract
The chain elongation reaction catalyzed by polyprenyl diphosphate synthases is the fundamental building reaction in the isoprenoid pathway. During chain elongation, the hydrocarbon moiety in an allylic isoprenoid diphosphate is added to the carbon–carbon double bond of isopentenyl diphosphate (IPP). The chain elongation enzymes can be divided into two genetically different families depending on whether the stereochemistry of the newly formed double bond during each cycle of chain elongation is E or Z. Farnesyl diphosphate (FPP) synthase, a member of the E-double bond family, is the best studied of the chain elongation enzymes and serves as a paradigm for understanding the reactions catalyzed by E-polyprenyl diphosphate synthases. The mechanism for chain elongation is a stereoselective electrophilic alkylation of the carbon–carbon double bond in IPP by the allylic substrate. X-ray structures of avian and E. coli FPP synthases have provided important insights about the mechanism for chain elongation and a structural basis for understanding the stereochemistry of the reaction.
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Abbreviations
- DMAPP:
-
dimethylallyl diphosphate
- FPP:
-
farnesyl diphosphate
- GPP:
-
geranyl diphosphate
- IPP:
-
isopentenyl diphosphate
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This review is dedicated to Professor Rodney Croteau on the occasion of his 60th birthday.
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Poulter, C.D. Farnesyl Diphosphate Synthase. A Paradigm for Understanding Structure and Function Relationships in E-polyprenyl Diphosphate Synthases. Phytochem Rev 5, 17–26 (2006). https://doi.org/10.1007/s11101-005-4887-1
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DOI: https://doi.org/10.1007/s11101-005-4887-1