ISDA: 1O8B

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Deposition Date 2002-11-26

Release Date 2003-01-24

Last Version Date 2024-10-23

Entry Detail

PDB ID:

1O8B

Keywords:

ISOMERASE

Title:

Structure of Escherichia coli ribose-5-phosphate isomerase, RpiA, complexed with arabinose-5-phosphate.

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.25 Å

R-Value Free:

0.24

R-Value Work:

0.22

R-Value Observed:

0.22

Space Group:

P 1

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:RIBOSE 5-PHOSPHATE ISOMERASE
Gene (Uniprot):rpiA
Chain IDs:A, B
Chain Length:219
Number of Molecules:2
Biological Source:ESCHERICHIA COLI

UniProt ID:P0A7Z0 Pfam ID:PF06026 EC:5.3.1.6

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
MSE	A	MET	SELENOMETHIONINE

Ligand Molecules

ABF

Primary Citation

Structure of Escherichia Coli Ribose-5-Phosphate Isomerase: A Ubiquitous Enzyme of the Pentose Phosphate Pathway and the Calvin Cycle

Zhang, R.-G, Andersson, C.E, Savchenko, A, Skarina, T, Evdokimova, E, Beasley, S, Arrowsmith, C.H, Edwards, A.M, Joachimiak, A, Mowbray, S.L, Hove-Jensen, B, Maigaard, M.Show

Structure 11 31 ? (2003)

PMID: 12517338 DOI: 10.1016/S0969-2126(02)00933-4

Abstact

Ribose-5-phosphate isomerase A (RpiA; EC 5.3.1.6) interconverts ribose-5-phosphate and ribulose-5-phosphate. This enzyme plays essential roles in carbohydrate anabolism and catabolism; it is ubiquitous and highly conserved. The structure of RpiA from Escherichia coli was solved by multiwavelength anomalous diffraction (MAD) phasing, and refined to 1.5 A resolution (R factor 22.4%, R(free) 23.7%). RpiA exhibits an alpha/beta/(alpha/beta)/beta/alpha fold, some portions of which are similar to proteins of the alcohol dehydrogenase family. The two subunits of the dimer in the asymmetric unit have different conformations, representing the opening/closing of a cleft. Active site residues were identified in the cleft using sequence conservation, as well as the structure of a complex with the inhibitor arabinose-5-phosphate at 1.25 A resolution. A mechanism for acid-base catalysis is proposed.

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Primary Citation of related structures

Abstact

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