1I55

CYTOCHROME C (TUNA) WITH 2ZN:1FE MIXED-METAL PORPHYRINS

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)	CYTOCHROME C	polymer	103	11390.1	2	UniProt (P81459) Pfam (PF00034)	Thunnus thynnus (bluefin tuna)
2	C, E (A, B)	HEME C	non-polymer		618.5	2	Chemie (HEC)
3	D, F (A, B)	PROTOPORPHYRIN IX CONTAINING ZN	non-polymer		626.1	2	Chemie (ZNH)
4	G, H (A, B)	water	water		18.0	370	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	22780.2
Non-Polymers*	Number of molecules	4
	Total formula weight	2489.1
All*	Total formula weight	25269.3

*Water molecules are not included.