6Z01

DNA Topoisomerase

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	539	64099.1	2	UniProt (E6NAV3) Pfam (PF02919) Pfam (PF01028) Pfam (PF14370) UniProt (by SIFTS) (E6N697)	Caldiarchaeum subterraneum
2	C, D, E, F, G... (A, B)	CHLORIDE ION	non-polymer		35.5	12	Chemie (CL)
3	O, P (A, B)	water	water		18.0	1121	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	128198.2
Non-Polymers*	Number of molecules	12
	Total formula weight	425.4
All*	Total formula weight	128623.6

*Water molecules are not included.