6W7I

LmFPPS mutant T164W in complex with 476A, IPP & Ca

Summary for 6W7I

• Entry DOI: 10.2210/pdb6w7i/pdb
• Descriptor: Farnesyl pyrophosphate synthase, CALCIUM ION, ACETATE ION, ... (7 entities in total)
• Functional Keywords: fpps, farnesyl diphosphate synthase, isoprenoid, transferase
• Biological source: Leishmania major
• Total number of polymer chains: 2
• Total formula weight: 83810.92

Authors

Maheshwari, S.,Kim, Y.S.,Aripirala, S.,Gabelli, S.B. (deposition date: 2020-03-19, release date: 2020-10-07, Last modification date: 2024-10-30)

Primary citation

Maheshwari, S.,Kim, Y.S.,Aripirala, S.,Murphy, M.,Amzel, L.M.,Gabelli, S.B.
Identifying Structural Determinants of Product Specificity in Leishmania major Farnesyl Diphosphate Synthase.
Biochemistry, 59:2751-2759, 2020

PubMed Abstract: Farnesyl diphosphate synthase (FPPS) is an isoprenoid chain elongation enzyme that catalyzes the sequential condensation of dimethylallyl diphosphate (C) with isopentenyl diphosphate (IPP; C) and the resulting geranyl diphosphate (GPP; C) with another molecule of IPP, eventually producing farnesyl diphosphate (FPP; C), which is a precursor for the biosynthesis of a vast majority of isoprenoids. Previous studies of FPPS have highlighted the importance of the structure around the hydrophobic chain elongation path in determining product specificity. To investigate what structural features define the final chain length of the product in FPPS from , we designed and expressed six mutants of FPPS by replacing small amino acids around the binding pocket with bulky residues. Using enzymatic assays, binding kinetics, and crystallographic studies, we analyzed the effects of these mutations on the activity and product specificity of FPPS. Our results revealed that replacement of Thr-164 with tryptophan and phenylalanine completely abolished the activity of FPPS. Intriguingly, the T164Y substitution displayed dual product specificity and produced a mixture GPP and FPP as final products, with an activity for FPP synthesis that was lower than that of the wild-type enzyme. These data indicate that Thr-164 is a potential regulator of product specificity.

PubMed: 32584028
DOI: 10.1021/acs.biochem.0c00432

Experimental method

X-RAY DIFFRACTION (2.1 Å)