D-Glyceraldehyde-3-Phosphate Dehydrogenase. The Purification and Characterisation of the Enzyme from the Thermophiles Bacillus stearothermophilus and Thermus aquaticus

Abstract
D-Glyceraldehyde-3-phosphate dehydrogenase from 2 thermophilic bacteria was purified by procedures including affinity chromatography on NAD+-Sepharose. Methods for making NAD+-free enzyme are also described. Both the holo and apo forms of the enzyme from B. stearothermophilus were crystallized. The enzymes are tetrameric and composed of 4 chemically identical polypeptide chains of MW 36,000. The enzymes are much more stable to heat than their counterparts from mesophiles.