5olw
From Proteopedia
5-fluorotryptophan labeled beta-phosphoglucomutase in an open conformation
Structural highlights
FunctionPGMB_LACLA Catalyzes the interconversion of D-glucose 1-phosphate (G1P) and D-glucose 6-phosphate (G6P), forming beta-D-glucose 1,6-(bis)phosphate (beta-G16P) as an intermediate. The beta-phosphoglucomutase (Beta-PGM) acts on the beta-C(1) anomer of G1P. Glucose or lactose are used in preference to maltose, which is only utilized after glucose or lactose has been exhausted. It plays a key role in the regulation of the flow of carbohydrate intermediates in glycolysis and the formation of the sugar nucleotide UDP-glucose.[1] [2] Publication Abstract from PubMedTernary transition state analogue (TSA) complexes probing the isomerization of beta-d-glucose 1-phosphate (G1P) into d-glucose 6-phosphate (G6P) catalyzed by catalytically active, fluorinated (5-fluorotryptophan), beta-phosphoglucomutase (betaPGM) have been observed directly by (19)F NMR spectroscopy. In these complexes MgF3(-) and AlF4(-) are surrogates for the transferring phosphate. However, the relevance of these metal fluorides as TSA complexes has been queried. The 1D (19)F spectrum of a ternary TSA complex presented a molar equivalence between fluorinated enzyme, metal fluoride and non-isomerizable fluoromethylenephosphonate substrate analogue. Ring flips of the 5-fluoroindole ring remote from the active site were observed by both (19)F NMR and X-ray crystallography, but did not perturb function. This data unequivocally demonstrates that the concentration of the metal fluoride complexes is equivalent to the concentration of enzyme and ligand in the TSA complex in aqueous solution. Observing enzyme ternary transition state analogue complexes by (19)F NMR spectroscopy.,Ampaw A, Carroll M, von Velsen J, Bhattasali D, Cohen A, Bowler MW, Jakeman DL Chem Sci. 2017 Dec 1;8(12):8427-8434. doi: 10.1039/c7sc04204c. Epub 2017 Oct 23. PMID:29619190[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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