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Superposition of a subunit of tetrameric E. coli apo CTP synthase (PDB code 1s1m, shown in orange) onto a subunit from dimeric S. solfataricus CTP synthase (shown in blue). The synthase domain is in the upper part of the figure and the amidotransferase domain is in the lower part. Residues 11–16, 180–200 and 219–230 of the S. solfataricus structure are shown in green. This figure was prepared in PyMOL (DeLano, 2002 ▶).
