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. Author manuscript; available in PMC: 2013 Mar 20.
Published in final edited form as: Acc Chem Res. 2011 Oct 19;45(3):444–453. doi: 10.1021/ar200166p

FIGURE 4.

FIGURE 4

The secondary structural elements of one catalytic and one regulatory chain of E. coli ATCase in the T-state. The N- and C-termini of the catalytic and regulatory chains are indicated, as well as the Zn atom in the regulatory chain that is coordinated tetrahedrally to four cysteine residues. Each catalytic chain is composed of an aspartate (Asp) and a carbamoyl phosphate (CP) domain. Each regulatory chain is composed of an allosteric (Al) and a zinc (Zn) domain. This figure was drawn with MOLSCRIPT49 using data from PDB entry 1ZA1.