1N3U

Crystal structure of human heme oxygenase 1 (HO-1) in complex with its substrate heme, crystal form B

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	heme oxygenase 1	polymer	233	26898.6	2	UniProt (P09601) Pfam (PF01126)	Homo sapiens (human)	HO-1
2	C, E, F (A, B)	CHLORIDE ION	non-polymer		35.5	3	Chemie (CL)
3	D, G (A, B)	PROTOPORPHYRIN IX CONTAINING FE	non-polymer		616.5	2	Chemie (HEM)
4	H, I (A, B)	water	water		18.0	87	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	53797.2
Non-Polymers*	Number of molecules	5
	Total formula weight	1339.3
All*	Total formula weight	55136.6

*Water molecules are not included.