8YO3

structure of phage T4 topoisomerase II central domain

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 topoisomerase medium subunit	polymer	442	50570.5	2	UniProt (P07065) Pfam (PF00521) In PDB	Escherichia phage T4	DNA topoisomerase 51-kDa subunit,Protein Gp52
2	C, D	phage T4 topoisomerase II gp39-gp60 subunit	polymer	682	77524.7	2		Escherichia phage T4

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	256190.5
All*	Total formula weight	256190.5

*Water molecules are not included.