ISDA

Deposition Date 1988-10-21

Release Date 1990-07-15

Last Version Date 2024-10-30

Entry Detail

PDB ID:

7DFR

Keywords:

OXIDOREDUCTASE

Title:

CRYSTAL STRUCTURES OF ESCHERICHIA COLI DIHYDROFOLATE REDUCTASE. THE NADP+ HOLOENZYME AND THE FOLATE(DOT)NADP+ TERNARY COMPLEX. SUBSTRATE BINDING AND A MODEL FOR THE TRANSITION STATE

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Observed:

0.24

Space Group:

P 32 2 1

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:DIHYDROFOLATE REDUCTASE
Gene (Uniprot):folA
Chain IDs:A
Chain Length:159
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P0ABQ4 Pfam ID:PF00186 EC:1.5.1.3

Ligand Molecules

FOL

NAP

Primary Citation

Crystal structures of Escherichia coli dihydrofolate reductase: the NADP+ holoenzyme and the folate.NADP+ ternary complex. Substrate binding and a model for the transition state.

Bystroff, C, Oatley, S.J, Kraut, J, Bystroff, C, Kraut, J, Bolin, J.T, Filman, D.J, Matthews, D.A, Hamlin, R.C, Kraut, J, Perry, K.M, Onuffer, J.J, Touchette, N.A, Herndon, C.S, Gittelman, M.S, Matthews, C.R, Chen, J.-T, Mayer, R.J, Taira, K, Benkovic, S.J, Howell, E.E, Kraut, J, Filman, D.J, Bolin, J.T, Matthews, D.A, Kraut, J, Volz, K.W, Matthews, D.A, Alden, R.A, Freer, S.T, Hansch, C, Kaufman, B.T, Kraut, J, Matthews, D.A, Matthews, D.A, Alden, R.A, Freer, S.T, Xuong, N.-H, Kraut, J, Poe, M, Hoogsteen, K, Matthews, D.A, Matthews, D.A, Alden, R.A, Bolin, J.T, Filman, D.J, Freer, S.T, Hamlin, R, Hol, W.G.J, Kisliuk, R.L, Pastore, E.J, Plante, L.T, Xuong, N.-H, Kraut, J, Bennett, C.D, Rodkey, J.A, Sondey, J.M, Hirschmann, R, Matthews, D.A, Alden, R.A, Bolin, J.T, Freer, S.T, Hamlin, R, Xuong, N, Kraut, J, Poe, M, Williams, M, Hoogsteen, K, Poe, M, Greenfield, N.J, Hirshfield, J.M, Williams, M.N, Hoogsteen, K.Show

Biochemistry 29 3263 3277 (1990)

PMID: 2185835 DOI: 10.1021/bi00465a018

Abstact

The crystal structure of dihydrofolate reductase (EC 1.5.1.3) from Escherichia coli has been solved as the binary complex with NADP+ (the holoenzyme) and as the ternary complex with NADP+ and folate. The Bragg law resolutions of the structures are 2.4 and 2.5 A, respectively. The new crystal forms are nonisomorphous with each other and with the methotrexate binary complex reported earlier [Bolin, J. T., Filman, D. J., Matthews, D. A., Hamlin, R. C., & Kraut, J. (1982) J. Biol. Chem. 257, 13650-13662]. In general, NADP+ and folate binding conform to predictions, but the nicotinamide moiety of NADP+ is disordered in the holoenzyme and ordered in the ternary complex. A mobile loop (residues 16-20) involved in binding the nicotinamide is also disordered in the holoenzyme. We report a detailed analysis of the binding interactions for both ligands, paying special attention to several apparently strained interactions that may favor the transition state for hydride transfer. Hypothetical models are presented for the binding of 7,8-dihydrofolate in the Michaelis complex and for the transition-state complex.

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