Erythrocruorin

Annelid erythrocruorin linker subunit, C-terminal
Annelid erythrocruorin linker subunit, C-terminal
Identifiers
Symbol	Eryth_link_C
Pfam	PF16915
InterPro	IPR031639
CATH	2gtlM02
SCOP2	8029676 / SCOPe / SUPFAM
CDD	cd11673
PDB
Available protein structures:
PDB	IPR031639 PF16915 (ECOD; PDBsum)
AlphaFold	IPR031639; PF16915;

Available protein structures:
PDB	IPR014610
AlphaFold	IPR014610;

Globin, extracellular
Globin, extracellular
	Lumbricus Erythrocruorin (PDB: 2GTL)
Identifiers
Symbol	Haemoglobin_extracell
InterPro	IPR014610
PDB
Available protein structures:
PDB	IPR014610
AlphaFold	IPR014610;

Erythrocruorin (from Greek eruthros "red" + Latin cruor "blood"), and the similar chlorocruorin (from Greek khlōros "green" + Latin cruor "blood"), are large oxygen-carrying hemeprotein complexes, which have a molecular mass greater than 3.5 million daltons. Both are sometimes called giant hemoglobin or hexagonal bilayer haemoglobin. They are found in many annelids and arthropods (including some insects).

Chlorocruorin is particularly found in certain marine polychaetes.