ISDA: 1Q05

Deposition Date 2003-07-15

Release Date 2003-09-16

Last Version Date 2024-04-03

Entry Detail

PDB ID:

1Q05

Keywords:

TRANSCRIPTION

Title:

Crystal structure of the Cu(I) form of E. coli CueR, a copper efflux regulator

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Host Organism:

Escherichia coli BL21(DE3)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.20 Å

R-Value Free:

0.25

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Transcriptional regulator cueR
Gene (Uniprot):cueR
Chain IDs:A, B
Chain Length:135
Number of Molecules:2
Biological Source:Escherichia coli

UniProt ID:P0A9G4 Pfam ID:PF00376, PF09278

Ligand Molecules

CU1

Primary Citation

Molecular basis of metal-ion selectivity and zeptomolar sensitivity by CueR

Changela, A, Chen, K, Xue, Y, Holschen, J, Outten, C.E, O'Halloran, T.V, Mondragon, A.Show

Science 301 1383 1387 (2003)

PMID: 12958362 DOI: 10.1126/science.1085950

Abstact

The earliest of a series of copper efflux genes in Escherichia coli are controlled by CueR, a member of the MerR family of transcriptional activators. Thermodynamic calibration of CueR reveals a zeptomolar (10(-21) molar) sensitivity to free Cu+, which is far less than one atom per cell. Atomic details of this extraordinary sensitivity and selectivity for +1transition-metal ions are revealed by comparing the crystal structures of CueR and a Zn2+-sensing homolog, ZntR. An unusual buried metal-receptor site in CueR restricts the metal to a linear, two-coordinate geometry and uses helix-dipole and hydrogen-bonding interactions to enhance metal binding. This binding mode is rare among metalloproteins but well suited for an ultrasensitive genetic switch.

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Primary Citation of related structures