ISDA: 1Q09

Deposition Date 2003-07-15

Release Date 2003-09-16

Last Version Date 2024-04-03

Entry Detail

PDB ID:

1Q09

Keywords:

TRANSCRIPTION

Title:

Crystal structure of the Zn(II) form of E. coli ZntR, a zinc-sensing transcriptional regulator (space group I4122)

Biological Source:

Source Organism(s):

Escherichia coli (Taxon ID: 562)

Expression System(s):

Escherichia coli bl21(de3)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Free:

0.27

R-Value Work:

0.25

R-Value Observed:

0.25

Space Group:

I 41 2 2

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Zn(II)-responsive regulator of zntA
Gene (Uniprot):zntR
Chain IDs:A
Chain Length:99
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P0ACS5 Pfam ID:PF09278

Ligand Molecules

SO4

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

Abstact

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