Evolutionary trace analysis of the alpha-D-phosphohexomutase superfamily

Protein Science : a Publication of the Protein Society
Grant S ShackelfordLesa J Beamer

Abstract

The alpha-D-phosphohexomutase superfamily is composed of four related enzymes that catalyze a reversible, intramolecular phosphoryl transfer on their sugar substrates. The enzymes in this superfamily play important and diverse roles in carbohydrate metabolism in organisms from bacteria to humans. Recent structural and mechanistic studies of one member of this superfamily, phosphomannomutase/phosphoglucomutase (PMM/PGM) from Pseudomonas aeruginosa, have provided new insights into enzyme mechanism and substrate recognition. Here we use sequence-sequence and sequence-structure comparisons via evolutionary trace analysis to examine 71 members of the alpha-D-phosphohexomutase superfamily. These analyses show that key residues in the active site, including many of those involved in substrate contacts in the P. aeruginosa PMM/PGM complexes, are conserved throughout the enzyme family. Several important regions show class-specific differences in sequence that appear to be correlated with differences in substrate specificity exhibited by subgroups of the family. In addition, we describe the translocation of a 20-residue segment containing the catalytic phosphoserine of phosphoacetylglucosamine mutase, which uniquely identifies members of...Continue Reading

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Citations

Jun 13, 2012·Natural Product Reports·Shanteri SinghJon S Thorson
Apr 4, 2006·Acta Crystallographica. Section F, Structural Biology and Crystallization Communications·Yuichi NishitaniKunio Miki
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