7ATG

Crystal structure of Z-DNA in complex with putrescinium and potassium cations at ultrahigh-resolution

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	DNA (5'-D(*CP*GP*CP*GP*CP*G)-3')	polymer	6	1810.2	2		synthetic construct
2	C (A)	POTASSIUM ION	non-polymer		39.1	1	Chemie (K)
3	D (B)	4-azaniumylbutylazanium	non-polymer		90.2	1	Chemie (58I)
4	E, F (A, B)	water	water		18.0	123	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	3620.4
Non-Polymers*	Number of molecules	2
	Total formula weight	129.3
All*	Total formula weight	3749.7

*Water molecules are not included.