2AA-GPP utilization is impaired with V. vulnif icus UPPS and E. coli UPPS. (A) UPPS concentrations that doubled the 2CNA-GPP UPPSBf rate with the E. coli and V vulnif icus proteins were used. (B) Distribution of products form reactions in panel A quenched at 1500 s. (C) Change in fluorescence with 2AA-GPP with all enzyme concentrations used in panel A increased by 3.5-fold. (D) Distribution of products in panel C after quenching at 1500 s: (1, red) UPPSBf, (2, black) UPPSEc, and (3, blue) UPPSVv. Chromatograms 2 and 3 are offset by 2 and 4 min, respectively. Note that the peaks representing flow-through material are cut to give the best view of long chain isoprenoid products.