1NTA

2.9 A crystal structure of Streptomycin RNA-aptamer

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	5'-R(*GP*GP*AP*UP*CP*GP*CP*AP*UP*UP*UP*GP*GP*AP*CP*UP*UP*CP*UP*GP*CP*C)-3'	polymer	22	6988.1	1
2	B	5'-R(*CP*GP*GP*CP*AP*CP*CP*AP*CP*GP*GP*UP*CP*GP*GP*AP*UP*C)-3'	polymer	18	5762.5	1
3	A, B	BARIUM ION	non-polymer		137.3	3	Chemie (BA)
4	A	SODIUM ION	non-polymer		23.0	2	Chemie (NA)
5	A	STREPTOMYCIN	non-polymer		581.6	1	Chemie (SRY)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	12750.6
Non-Polymers*	Number of molecules	6
	Total formula weight	1039.5
All*	Total formula weight	13790.2

*Water molecules are not included.