Table 2.

Unresolved electron density close to cytosolic cysteine residues in X-ray structures of Na,K-ATPase α-subunit.

PDB ID/Cys position	3WGU	3WGV	3KDP	4HYT	3B8E	S-glutathionylationa
204, 242	Densityb	Density	Small size of densityc	Small size of density	Small size of density	+
336	Distant densityd	Distant density	Density	Density	Distant density	+
349	Fragmented densitye	Fragmented density	ndf	nd	nd	+
367, 698	Density	Fragmented density	Distant density	nd	nd	+
421	nd	nd	Small size of density	nd	nd	−
452, 456	Density	Fragmented density	Density	Fragmented density	Density	+
457	Surface	Surface	Surface	Surface	Surface	+
511, 549	Density	Small size of density	nd	nd	nd	+
656	Fragmented density	Fragmented density	nd	nd	nd	+
599	Density	Fragmented density	Density	Density	Density	Not detected
577	Surface	Surface	Surface	Surface	Surface	Not detected

^aAccording to MALDI-TOF mass spectrometry data in [13].

^b“Density”: unresolved density that can fit by glutathione.

^c“Small size of density”: unresolved density but too small to fit glutathione.

^d“Distant density”: unresolved electron density at a distance of more than 5 Å from Cys (glutathione fits density, but the density is far from the residue).

^e“Fragmented”: no intact unresolved density.

^f“nd”: no unresolved density close to the residue.