Table 3.

Reported PDB structures of CysE enzyme of cysteine biosynthetic pathway

Domain	Organism	SAT (CysE) and apo or ligand bound
Bacteria	Escherichia coli	1T3D (complexed with cysteine) (Pye et al. 2004)
	Klebsiella pneumoniae	6JVU (complexed with cysteine) (Verma et al. 2019)
	Vibrio cholerae	4H7O (complexed with cysteine) (To be published)
	Yersinia pestis	3GVD (complexed with cysteine) (To be published)
	Brucella melitensis	3MC4 (Apo form) (To be published)
	Brucella abortus	4HZC (Apo form) (Kumar et al. 2014); 4HZD (complexed with Acetyl CoA) (Kumar et al. 2014)
	Haemophilus influenzae	1S80 (Apo form) (Gorman and Shapiro 2004); 1SSM (truncated apoenzyme) (Olsen et al. 2004); 1SSQ (complexed with cysteine) (Olsen et al. 2004); 1SST (complexed with Acetyl CoA) (Olsen et al. 2004)
	Bacteroides vulgates	3F1X (Apo form) (To be published)
Protozoa	Entamoeba histolytica	3P1B (Apo form) (Kumar et al. 2011); 3P47 (complexed with L-cysteine) (Kumar et al. 2011); 3Q1X (complexed with L-serine) (Kumar et al. 2011)
Plant	Glycine max	4N69 (complexed with serine) (Yi et al. 2013); 4N6A (apo form) (Yi et al. 2013); 4N6B (complexed with CoA) (Yi et al. 2013)