[On different forms of glyceraldehyde-3-phosphate dehydrogenase].

Evidence is presented for the structural differences between rat and rabbit skeletal muscle glyceraldehyde-3-phosphate dehydrogenases. Glyceral-dehyde-3-phosphate dehydrogenases isolated from frozen and fresh rat skeletal muscle were found to have different temperature stability and chromatographic behavior on CM-cellulose. Different nucleotide content of the preparations (NAD on one hand, and products of its degradation - ADP-ribose, AMP and adenosine, on the other) is shown to account for the observed effects.