4OQU

Structure of the SAM-I/IV riboswitch (env87(deltaU92))

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	SAM-I/IV riboswitch	polymer	97	31622.0	1
2	A	S-ADENOSYLMETHIONINE	non-polymer		398.4	1	Chemie (SAM)
3	A	MAGNESIUM ION	non-polymer		24.3	5	Chemie (MG)

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	31622.0
Non-Polymers*	Number of molecules	6
	Total formula weight	520.0
All*	Total formula weight	32142.0

*Water molecules are not included.