Abstract
Two complexes of the enzyme phosphomannomutase/phosphoglucomutase (PMM/PGM) from Pseudomonas aeruginosa with a slow substrate and with an inhibitor have been characterized by X-ray crystallography. Both ligands induce an interdomain rearrangement in the enzyme that creates a highly buried active site. Comparisons with enzyme-substrate complexes show that the inhibitor xylose 1-phosphate utilizes many of the previously observed enzyme-ligand interactions. In contrast, analysis of the ribose 1-phosphate complex reveals a combination of new and conserved enzyme-ligand interactions for binding. The ability of PMM/PGM to accommodate these two pentose phosphosugars in its active site may be relevant for future efforts towards inhibitor design.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Bacterial Proteins / antagonists & inhibitors
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Bacterial Proteins / chemistry
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Bacterial Proteins / metabolism
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Binding Sites
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Crystallography, X-Ray
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Enzyme Inhibitors / chemistry
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Enzyme Inhibitors / pharmacology
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Ligands
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Models, Molecular
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Pentosephosphates / chemistry
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Pentosephosphates / pharmacology
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Phosphoglucomutase / antagonists & inhibitors
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Phosphoglucomutase / chemistry*
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Phosphoglucomutase / metabolism
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Phosphotransferases (Phosphomutases) / antagonists & inhibitors
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Phosphotransferases (Phosphomutases) / chemistry*
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Phosphotransferases (Phosphomutases) / metabolism
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Protein Conformation
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Pseudomonas aeruginosa / enzymology*
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Ribosemonophosphates / chemistry
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Ribosemonophosphates / pharmacology
Substances
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Bacterial Proteins
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Enzyme Inhibitors
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Ligands
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Pentosephosphates
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Ribosemonophosphates
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ribose 1-phosphate
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xylose 1-phosphate
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Phosphotransferases (Phosphomutases)
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Phosphoglucomutase
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phosphomannomutase