6N21

Structure of wild-type CAO1

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D	Carotenoid oxygenase	polymer	526	59497.9	4	UniProt (A0A0B0DIC8) In PDB	Neurospora crassa
2	A, B, C, D	FE (II) ION	non-polymer		55.8	4	Chemie (FE2)
3	A, B, C, D	CHLORIDE ION	non-polymer		35.5	4	Chemie (CL)
4		water	water		18.0	1135	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	237991.7
Non-Polymers*	Number of molecules	8
	Total formula weight	365.2
All*	Total formula weight	238356.9

*Water molecules are not included.