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. Author manuscript; available in PMC: 2018 Oct 15.
Published in final edited form as: Arch Biochem Biophys. 2017 May 31;632:47–58. doi: 10.1016/j.abb.2017.05.017

Scheme 6.

Scheme 6

The radical clock IPP analogue 3-cyclopropyl-3-buten-1-yl diphosphate (cIPP, 9) is converted by IDI-2 into the corresponding DMAPP product (10), suggesting that a radical intermediate (e.g. 11) is not generated by IDI-2 during turnover. These data argue strongly against a single electron transfer mechanism for IDI-2.