Table 1.

Structural Characteristics of Cation‐coordination in Solved Hemerythrin‐like Domain Structures

Protein	Organism	Function	Coordination number	Ligation	Source [PDB code]
Hemerythrin (subunit A)	Themiste dyscritum	Reversible O2 binding	6C/5C	5H/1E/1D	[1HMD]20
Myohemerythrin	Themiste hennahi	Reversible O2 binding	6C/5C	5H/1E/1D	[2MHR]21
Bacteriohemerythrin (McHr)	Methylococcus capsulatus	Reversible O2 binding	6C/5C	5H/1E/1D	[4XPX]16
Hemerythrin‐like domain (DcrH)	Desulfovibrio vulgaris	O2 sensing	6C/5C	5H/1E/1D	[2AWC]22
Hemerythrin‐like domain (FBXL5)	Homo sapiens	Iron sensing	6C/5C	4H/3E	[3V5X]23
Hemerythrin‐like‐domain (YtfE)	Escherichia coli	2NO + 2H+ + 2e‐ → N2O + H2O	5C/5C	4H/2E	[5FNN]24
Hemerythrin domain (hypothetical protein NMB1532)	Neisseria meningitidis	Unknown	5C/5C	4H/2E	[2P0N]
Hemerythrin domain (uncharacterized protein PF0695)	Pyrococcus furiosus	Unknown	–	–	[3CAX]