3F4G

Crystal structure of the FMN riboswitch bound to riboflavin.

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (X)	FMN riboswitch	polymer	54	17455.4	1	GenBank (20095250)
2	B (Y)	FMN riboswitch	polymer	56	18092.8	1	GenBank (20095250)
3	C, N (X, Y)	POTASSIUM ION	non-polymer		39.1	2	Chemie (K)
4	D, E, F, G, H... (X, Y)	MAGNESIUM ION	non-polymer		24.3	15	Chemie (MG)
5	M (Y)	RIBOFLAVIN	non-polymer		376.4	1	Chemie (RBF)

Sequence modifications

X: 3 - 54 (GenBank: 20095250)

PDB	External Database	Details
G 1	-	insertion
G 2	-	insertion
C 52	U 2544	engineered mutation
U 53	A 2545	engineered mutation

Y: 57 - 109 (GenBank: 20095250)

PDB	External Database	Details
U 110	-	insertion
U 111	-	insertion
C 112	-	insertion

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	35548.2
Non-Polymers*	Number of molecules	18
	Total formula weight	819.1
All*	Total formula weight	36367.3

*Water molecules are not included.