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Default Kinetic, binding, and NMR studies of perdeuterated yeast phosphoglycerate kinase and

Kinetic, binding, and NMR studies of perdeuterated yeast phosphoglycerate kinase and its interactions with substrates.

Related Articles Kinetic, binding, and NMR studies of perdeuterated yeast phosphoglycerate kinase and its interactions with substrates.

Arch Biochem Biophys. 1995 May 10;319(1):204-10

Authors: Shibata CG, Gregory JD, Gerhardt BS, Serpersu EH

Perdeuterated yeast phosphoglycerate kinase (2HPGK) was prepared from yeast cells grown in 99.9% 2H2O and an acid hydrolysate from deuterated algal cells. Kinetic and binding studies suggested that perdeuterated enzyme was similar to the isotopically normal PGK. The use of 2HPGK not only eliminated the spectral overlap between the enzyme and substrate nuclear Overhauser effect (NOE) cross-peaks, but also permitted observation of weak transfer NOE cross-peaks between the substrate protons that are greater than 4 A apart. Intensity of NOE cross-peaks was used to determine the interproton distances of enzyme-bound Mg(II)dATP. These distances were then used in model building studies to determine the conformation of Mg(II)dATP. The average conformation of enzyme-bound dATP is anti with O4'/C2' endo ribose pucker and trans, gauche about the C4'-C5' bond. Although many spin diffusion pathways were eliminated by protein deuteration, spin diffusion was still observed between the protons of the substrate at mixing times longer than 25 ms.

PMID: 7771785 [PubMed - indexed for MEDLINE]



Source: PubMed
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