ISDA

Deposition Date 1996-10-03

Release Date 1997-10-22

Last Version Date 2024-02-14

Entry Detail

PDB ID:

1VIE

Keywords:

OXIDOREDUCTASE

Title:

STRUCTURE OF DIHYDROFOLATE REDUCTASE

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.70 Å

R-Value Work:

0.19

R-Value Observed:

0.19

Space Group:

I 41 2 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:DIHYDROFOLATE REDUCTASE
Chain IDs:A
Chain Length:62
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P00383 Pfam ID:PF06442 EC:1.5.1.3

Primary Citation

A plasmid-encoded dihydrofolate reductase from trimethoprim-resistant bacteria has a novel D2-symmetric active site.

Narayana, N, Matthews, D.A, Howell, E.E, Nguyen-huu, X, Holland, J.C, Linn, C.E, Digiammarino, E, Nichols, R, Howell, E.E, Reece, L.J, Nichols, R, Ogden, R.C, Howell, E.E, Matthews, D.A, Smith, S.L, Baccanari, D.P, Burchall, J.J, Oatley, S.J, Kraut, J, Stone, D, Smith, S.L, Fleming, M.P, Datta, N, Gruneberg, R.N.Show

Nat.Struct.Biol. 2 1018 1025 (1995)

PMID: 7583655 DOI: 10.1038/nsb1195-1018

Abstact

Bacteria expressing R67-plasmid encoded dihydrofolate reductase (R67 DHFR) exhibit high-level resistance to the antibiotic trimethoprim. Native R67 DHFR is a 34,000 M(r) homotetramer which exists in equilibrium with an inactive dimeric form. The structure of native R67 DHFR has now been solved at 1.7 A resolution and is unrelated to that of chromosomal DHFR. Homotetrameric R67 DHFR has an unusual pore, 25 A in length, passing through the middle of the molecule. Two folate molecules bind asymmetrically within the pore indicating that the enzyme's active site consists of symmetry related binding surfaces from all four identical units.

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Primary Citation of related structures