6CHR

Crystal structure of a group II intron lariat with an intact 3' splice site (pre-2s 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)	RNA (621-MER)	polymer	625	202121.8	1		Pylaiella littoralis
2	B (B)	RNA (5'-R(P*UP*GP*UP*UP*UP*AP*UP*UP*AP*AP*AP*AP*A)-3')	polymer	13	4112.5	1		Pylaiella littoralis
3	AA, AB, AC, BA, BB... (A, B)	MAGNESIUM ION	non-polymer		24.3	82	Chemie (MG)
4	QA (A)	SPERMINE	non-polymer		202.3	1	Chemie (SPM)
5	RA, SA, TA, UA, VA... (A)	SODIUM ION	non-polymer		23.0	9	Chemie (NA)
6	QC, RC (A, B)	water	water		18.0	236	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	206234.2
Non-Polymers*	Number of molecules	92
	Total formula weight	2402.3
All*	Total formula weight	208636.5

*Water molecules are not included.