The switch from inorganic to organic sulphur assimilation in Escherichia coli: adenosine 5′‐phosphosulphate (APS) as a signalling molecule for sulphate excess

Abstract
The utilization of organosulphur compounds as sources of sulphur by Escherichia coli is strongly repressed by sulphate. To search for the signal enabling E. coli to alternate gene expression accord...