Comparative analysis of two different amide-to-ester bond mutations in the beta-sheet of 4-oxalocrotonate tautomerase

Biochemistry
Peter Silinski, Michael C Fitzgerald

Abstract

Here we describe the total chemical synthesis and biophysical characterization of two backbone-modified, ester bond-containing analogues of the homohexameric enzyme 4-oxalocrotonate tautomerase (4OT). The amide-to-ester bond mutations in the two analogues in this study, (OI2)4OT and (OI7)4OT, were designed to effectively delete specific backbone-backbone hydrogen bonds in the beta-sheet region of the native 4OT hexamer. The (OI2)4OT and (OI7)4OT analogues each contained one ester bond per monomer that effectively deleted 12 backbone-backbone hydrogen bonds per hexamer. The structural properties of each analogue were characterized by size-exclusion chromatography (SEC), far-UV CD spectroscopy, and catalytic activity measurements, and they were found to be very similar to the structural properties of the wild-type enzyme. The results of equilibrium unfolding studies revealed that the (OI2)4OT and (OI7)4OT analogues were stabilized by 47.7 +/- 2.5 and 45.0 +/- 2.5 kcal/mol, respectively, under standard state conditions (1 M hexamer) as compared to a value of 69.6 +/- 3.3 kcal/mol for the wild-type control. Our results suggest that the two different, but structurally similar, backbone-backbone hydrogen bonds deleted in (OI2)4OT and...Continue Reading

References

Jan 1, 1995·Annual Review of Biophysics and Biomolecular Structure·D MendelP G Schultz

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Citations

Feb 14, 2006·Proceedings of the National Academy of Sciences of the United States of America·Min WangMichael C Fitzgerald
Oct 9, 2007·Biopolymers·Jan SpenglerFernando Albericio
Apr 28, 2012·Chembiochem : a European Journal of Chemical Biology·Zachary E ReinertW Seth Horne
Sep 24, 2004·Bioorganic Chemistry·Xiaoye YangMichael C Fitzgerald
Sep 12, 2006·Journal of Molecular Biology·Xiaoye YangMichael C Fitzgerald
Oct 21, 2011·Chemical Society Reviews·Søren L PedersenKnud J Jensen
Oct 30, 2013·Organic & Biomolecular Chemistry·Kuruppanthara N VijayadasGangadhar J Sanjayan

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