8D28

Crystal structure of theophylline aptamer in complex with theophylline

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (B, A)	RNA (33-MER)	polymer	33	10637.4	2		synthetic construct
2	C, J (B, A)	THEOPHYLLINE	non-polymer		180.2	2	Chemie (TEP)
3	D, E, F, G, L (B, A)	MAGNESIUM ION	non-polymer		24.3	5	Chemie (MG)
4	H, I, K, M (B, A)	SODIUM ION	non-polymer		23.0	4	Chemie (NA)
5	N, O (B, A)	water	water		18.0	362	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	21274.9
Non-Polymers*	Number of molecules	11
	Total formula weight	573.8
All*	Total formula weight	21848.7

*Water molecules are not included.