2C9M

Structure of (SR) Calcium-ATPase in the Ca2E1 state solved in a P1 crystal form.

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)	SARCOPLASMIC/ENDOPLASMIC RETICULUM CALCIUM ATPASE 1	polymer	994	109602.6	2	UniProt (P04191) Pfam (PF00690) Pfam (PF00122) Pfam (PF13246) Pfam (PF00702) Pfam (PF00689)	ORYCTOLAGUS CUNICULUS (RABBIT)	CALCIUM PUMP 1, ENDOPLASMIC RETICULUM CLASS 1/2 CA(2+) ATPAS, CALCIUM-TRANSPORTING ATPASE SARCOPLASMIC RETICULUM TYPE, SR CA(2+)-ATPASE 1, FAST TWITCH SKELETAL MUSCLE ISOFORM
2	C, D, F, G, I... (A, B)	CALCIUM ION	non-polymer		40.1	7	Chemie (CA)
3	E, K (A, B)	POTASSIUM ION	non-polymer		39.1	2	Chemie (K)
4	H, M (A, B)	CHLORIDE ION	non-polymer		35.5	2	Chemie (CL)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	219205.2
Non-Polymers*	Number of molecules	11
	Total formula weight	429.6
All*	Total formula weight	219634.8

*Water molecules are not included.