4FRG

Crystal structure of the cobalamin riboswitch aptamer domain

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, X)	cobalamin riboswitch aptamer domain	polymer	84	27135.2	2		Marine metagenome
2	C, T (B, X)	Hydroxocobalamin	non-polymer		1345.3	2	Chemie (I2A)
3	AA, BA, D, E, F... (X, B)	IRIDIUM (III) ION	non-polymer		192.2	17	Chemie (IR3)
4	CA, DA, EA, FA, GA... (X, B)	MAGNESIUM ION	non-polymer		24.3	16	Chemie (MG)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	54270.5
Non-Polymers*	Number of molecules	35
	Total formula weight	6347.3
All*	Total formula weight	60617.7

*Water molecules are not included.