6MC3

Crystal structure of a tetrameric DNA fold-back quadruplex

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, C, D (A, B, C, D)	DNA (5'-D(*CP*GP*TP*GP*AP*GP*GP*CP*G)-3')	polymer	9	2796.8	4		synthetic construct
2	E, F, G, H, I... (A, C, D)	MAGNESIUM ION	non-polymer		24.3	6	Chemie (MG)
3	K, L, M, N (A, B, C, D)	water	water		18.0	110	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	11187.3
Non-Polymers*	Number of molecules	6
	Total formula weight	145.8
All*	Total formula weight	11333.2

*Water molecules are not included.