Structural requirements of choline derivatives for ‘conversion’ of pneumococcal amidase A new single‐step procedure for purification of this autolysin

Abstract
Tertiary amines appear to be the minimal structure needed to convert in vitro the inactive form (E‐form) of pneumococcal amidase to the catalytic active form (C‐form). Diethylethanolamine was one of the compounds that converted the E‐form, a finding that has been used successfully to develop an affinity chromatography system in DEAE‐cellulose for the rapid and efficient purification of lytic enzymes of pneumococcus and its bacteriophages.