131D

THE LOW-TEMPERATURE CRYSTAL STRUCTURE OF THE PURE-SPERMINE FORM OF Z-DNA REVEALS BINDING OF A SPERMINE MOLECULE IN THE MINOR GROOVE

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	DNA (5'-D(*CP*GP*CP*GP*CP*G)-3')	polymer	6	1810.2	2
2	A, B	SPERMINE	non-polymer		202.3	2	Chemie (SPM)
3	A	SODIUM ION	non-polymer		23.0	2	Chemie (NA)
4		water	water		18.0	62	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	3620.4
Non-Polymers*	Number of molecules	4
	Total formula weight	450.7
All*	Total formula weight	4071.1

*Water molecules are not included.