4ADZ: Crystal Structure Of The Apo Form Of A Copper-Sensitive Operon Regulator (Csor) Protein From Streptomyces Lividans

Citation:
Abstract
A Copper sensitive operon Repressor protein has been identified in Streptomyces livdians (CsoRSl) and found to regulate copper homeostasis with attomolar affinity for Cu(I). Solution studies reveal apo- and CuI-CsoRSl to be a tetramer assembly and a 1.7 A resolution crystal structure of apo-CsoRSl reveals that a significant conformational change is necessary to enable Cu(I) binding. In silico prediction of the CsoR regulon was confirmed in vitro (EMSA) and in vivo (RNA-seq) which highlighted that next to the csoR gene itself, the regulon consists of two Cu(I) efflux systems involving a CopZ-like copper metallochaperone protein and a CopA P1-type ATPase. While deletion of csoR has only minor effects on S. lividans development when grown under high copper concentrations, mutations of the Cu(I) ligands decrease tolerance to copper as a result of the Cu(I)-CsoR mutants failing to disengage from the DNA targets, thus inhibiting the derepression of the regulon. RNA-seq experiments carried out on samples incubated with exogenous copper and a DeltacsoR strain showed that the set of genes responding to copper stress is much wider than anticipated and largely extends beyond genes targeted by CsoR. This suggests more control levels are operating and directing other regulons in copper homeostasis beside the CsoR regulon.
PDB ID: 4ADZDownload
MMDB ID: 99044
PDB Deposition Date: 2012/1/4
Updated in MMDB: 2012/05
Experimental Method:
x-ray diffraction
Resolution: 1.7  Å
Source Organism:
Similar Structures:
Biological Unit for 4ADZ: tetrameric; determined by author and by software (PISA)
Molecular Components in 4ADZ
Label Count Molecule
Proteins (4 molecules)
4
Csor
Molecule annotation
Chemicals (11 molecules)
1
11
* Click molecule labels to explore molecular sequence information.

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