3EOH

Refined group II intron structure

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	Group IIC intron	polymer	412	133652.2	1
2	B (B)	5'-R(*UP*UP*AP*UP*UP*A)-3'	polymer	6	1838.1	1
3	AA, BA, C, CA, D... (A, B)	MAGNESIUM ION	non-polymer		24.3	31	Chemie (MG)
4	GA, HA, IA, JA, KA... (A)	POTASSIUM ION	non-polymer		39.1	9	Chemie (K)
5	QA, RA (A, B)	water	water		18.0	13	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	135490.3
Non-Polymers*	Number of molecules	40
	Total formula weight	1105.3
All*	Total formula weight	136595.6

*Water molecules are not included.