(Saccharomyces cerevisiae), (Saccharomyces cerevisiae), (Saccharomyces cerevisiae), (Homo sapiens), (Homo sapiens), 4AG7 (Caenorhabditis elegans), among others. Figure 3 shows the proposed crystal structure of GNA in humans, with each catalytic subunit in a different color. The Acetyl-CoA bounded to the enzyme is shown in light pink, and the product still bound to the catalytic site is shown in purple. The transferred acetyl group in the N-acetyl-D-glucosamine-6-phosphate product in purple is shown in yellow. This proposed 3d structure of the protein shows that the specific parts of the substrates involved in this reaction - the terminal end of the linear portion of Acetyl-CoA and the nitrogen group attached to the glucosamine ring - are in great proximity. References EC 2.3.1 Enzymes of known structure