1x9h
From Proteopedia
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| , resolution 1.50Å | |||||||
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| Ligands: | , , | ||||||
| Gene: | PAE1610 (Pyrobaculum aerophilum) | ||||||
| Related: | 1TZB, 1TZC
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of phosphoglucose/phosphomannose isomerase from Pyrobaculum aerophilum in complex with fructose 6-phosphate
Overview
The crystal structure of a dual-specificity phosphoglucose/phosphomannose isomerase from the crenarchaeon Pyrobaculum aerophilum (PaPGI/PMI) has been determined in complex with glucose 6-phosphate at 1.16 A resolution and with fructose 6-phosphate at 1.5 A resolution. Subsequent modeling of mannose 6-phosphate (M6P) into the active site of the enzyme shows that the PMI activity of this enzyme may be due to the additional space imparted by a threonine. In PGIs from bacterial and eukaryotic sources, which cannot use M6P as a substrate, the equivalent residue is a glutamine. The increased space may permit rotation of the C2-C3 bond in M6P to facilitate abstraction of a proton from C2 by Glu203 and, after a further C2-C3 rotation of the resulting cis-enediolate, re-donation of a proton to C1 by the same residue. A proline residue (in place of a glycine in PGI) may also promote PMI activity by positioning the C1-O1 region of M6P. Thus, the PMI reaction in PaPGI/PMI probably uses a cis-enediol mechanism of catalysis, and this activity appears to arise from a subtle difference in the architecture of the enzyme, compared to bacterial and eukaryotic PGIs.
About this Structure
1X9H is a Single protein structure of sequence from Pyrobaculum aerophilum. Full crystallographic information is available from OCA.
Reference
Structural basis for phosphomannose isomerase activity in phosphoglucose isomerase from Pyrobaculum aerophilum: a subtle difference between distantly related enzymes., Swan MK, Hansen T, Schonheit P, Davies C, Biochemistry. 2004 Nov 9;43(44):14088-95. PMID:15518558
Page seeded by OCA on Mon Mar 31 00:46:34 2008
