1ZFS

Solution structure of S100A1 bound to calcium

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)	S-100 protein, alpha chain	polymer	93	10439.6	2	UniProt (P35467) Pfam (PF01023) Pfam (PF00036)	Rattus norvegicus (Norway rat)
2	C, D, E, F (A, B)	CALCIUM ION	non-polymer		40.1	4	Chemie (CA)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	20879.2
Non-Polymers*	Number of molecules	4
	Total formula weight	160.3
All*	Total formula weight	21039.5

*Water molecules are not included.