1EC5

CRYSTAL STRUCTURE OF FOUR-HELIX BUNDLE MODEL

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 (A, B, C)	PROTEIN (FOUR-HELIX BUNDLE MODEL)	polymer	50	5870.9	3
2	D, E, F (A, B, C)	ZINC ION	non-polymer		65.4	3	Chemie (ZN)
3	G, H, I (A, B, C)	water	water		18.0	32	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	3
	Total formula weight	17612.7
Non-Polymers*	Number of molecules	3
	Total formula weight	196.2
All*	Total formula weight	17808.9

*Water molecules are not included.