3WYO

Heterodimeric myoglobin formed by domain swapping

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C (A, C)	Myoglobin	polymer	153	16997.7	2	UniProt (P68082) Pfam (PF00042)	Equus caballus (horse)
2	B, D (B, D)	Myoglobin	polymer	153	16969.4	2	UniProt (P68082) Pfam (PF00042)	Equus caballus (horse)
3	E, F, G, H (A, B, C, D)	PROTOPORPHYRIN IX CONTAINING FE	non-polymer		616.5	4	Chemie (HEM)
4	I, J, K, L (A, B, C, D)	water	water		18.0	355	Chemie (HOH)

Sequence modifications

A, C: 1 - 153 (UniProt: P68082)

PDB	External Database	Details
Val 64	His 65	engineered mutation
His 68	Val 69	engineered mutation
Lys 85	Glu 86	engineered mutation
Lys 141	Asp 142	engineered mutation

B, D: 1 - 153 (UniProt: P68082)

PDB	External Database	Details
Glu 78	Lys 79	engineered mutation
Asp 79	Lys 80	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	67934.1
Non-Polymers*	Number of molecules	4
	Total formula weight	2465.9
All*	Total formula weight	70400.0

*Water molecules are not included.