2QWY

SAM-II riboswitch bound to S-adenosylmethionine

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)	SAM-II riboswitch	polymer	52	16821.0	3
2	D, E, I, J, L... (A, B, C)	PHOSPHATE ION	non-polymer		95.0	6	Chemie (PO4)
3	F, N (A, C)	CESIUM ION	non-polymer		132.9	2	Chemie (CS)
4	G (A)	MAGNESIUM ION	non-polymer		24.3	1	Chemie (MG)
5	H, K, O (A, B, C)	S-ADENOSYLMETHIONINE	non-polymer		398.4	3	Chemie (SAM)
6	P, Q, R (A, B, C)	water	water		18.0	154	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	3
	Total formula weight	50463.1
Non-Polymers*	Number of molecules	12
	Total formula weight	2055.3
All*	Total formula weight	52518.4

*Water molecules are not included.