1SK5

The ultra-high resolution structure of d(CTTTTAAAAG)2: modulation of bending by T-A steps and its role in 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, B (A, B)	5'-D(*CP*TP*TP*TP*TP*AP*AP*AP*AP*G)-3'	polymer	10	3043.0	2
2	C, D, E, F, G... (A, B)	CALCIUM ION	non-polymer		40.1	8	Chemie (CA) PubChem (271)
3	K, L (A, B)	water	water		18.0	156	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	6086.1
Non-Polymers*	Number of molecules	8
	Total formula weight	320.6
All*	Total formula weight	6406.7

*Water molecules are not included.