3Q51

Structural analysis of a class I PreQ1 riboswitch aptamer in the metabolite-free state.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	PREQ1 RIBOSWITCH	polymer	33	10599.4	1
2	B (A)	SULFATE ION	non-polymer		96.1	1	Chemie (SO4)
3	C (A)	MAGNESIUM ION	non-polymer		24.3	1	Chemie (MG)
4	D (A)	water	water		18.0	4	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	10599.4
Non-Polymers*	Number of molecules	2
	Total formula weight	120.4
All*	Total formula weight	10719.8

*Water molecules are not included.