206D

BASE-PAIR OPENING AND SPERMINE BINDING-B-DNA FEATURES DISPLAYED IN THE CRYSTAL STRUCTURE OF A GAL OPERON FRAGMENT: IMPLICATIONS FOR PROTEIN-DNA RECOGNITION

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	DNA (5'-D(*CP*GP*GP*TP*GP*G)-3')	polymer	6	1865.2	1
2	B	DNA (5'-D(*CP*CP*AP*CP*CP*G)-3')	polymer	6	1754.2	1
3	A	SPERMINE	non-polymer		202.3	2	Chemie (SPM)
4		water	water		18.0	17	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	3619.4
Non-Polymers*	Number of molecules	2
	Total formula weight	404.7
All*	Total formula weight	4024.1

*Water molecules are not included.