1K0W

CRYSTAL STRUCTURE OF L-RIBULOSE-5-PHOSPHATE 4-EPIMERASE

Summary for 1K0W

• Entry DOI: 10.2210/pdb1k0w/pdb
• Related: 1JDI
• Descriptor: L-RIBULOSE 5 PHOSPHATE 4-EPIMERASE, ZINC ION (3 entities in total)
• Functional Keywords: epimerase, ribulose, aldolase, isomerase
• Biological source: Escherichia coli
• Total number of polymer chains: 6
• Total formula weight: 153577.90

Authors

Luo, Y.,Samuel, J.,Mosimann, S.C.,Lee, J.E.,Strynadka, N.C.J. (deposition date: 2001-09-21, release date: 2003-01-28, Last modification date: 2023-08-16)

Primary citation

Luo, Y.,Samuel, J.,Mosimann, S.C.,Lee, J.E.,Tanner, M.E.,Strynadka, N.C.J.
The structure of L-ribulose-5-phosphate 4-epimerase: an aldolase-like platform for epimerization
Biochemistry, 40:14763-14771, 2001

PubMed Abstract: The structure of L-ribulose-5-phosphate 4-epimerase from E. coli has been solved to 2.4 A resolution using X-ray diffraction data. The structure is homo-tetrameric and displays C(4) symmetry. Each subunit has a single domain comprised of a central beta-sheet flanked on either side by layers of alpha-helices. The active site is identified by the position of the catalytic zinc residue and is located at the interface between two adjacent subunits. A remarkable feature of the structure is that it shows a very close resemblance to that of L-fuculose-1-phosphate aldolase. This is consistent with the notion that both enzymes belong to a superfamily of epimerases/aldolases that catalyze carbon-carbon bond cleavage reactions via a metal-stabilized enolate intermediate. Detailed inspection of the epimerase structure, however, indicates that despite the close overall structural similarity to class II aldolases, the enzyme has evolved distinct active site features that promote its particular chemistry.

PubMed: 11732895
DOI: 10.1021/bi0112513

Experimental method

X-RAY DIFFRACTION (2.1 Å)