1CYY

CRYSTAL STRUCTURE OF THE 30 KDA FRAGMENT OF E. COLI DNA TOPOISOMERASE I. HEXAGONAL FORM

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 TOPOISOMERASE I	polymer	264	29659.6	2	UniProt (P06612) Pfam (PF01131)	Escherichia coli
2	C (A)	ZINC ION	non-polymer		65.4	1	Chemie (ZN)
3	D, E (A, B)	water	water		18.0	380	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	59319.2
Non-Polymers*	Number of molecules	1
	Total formula weight	65.4
All*	Total formula weight	59384.6

*Water molecules are not included.