2QPO

Thermotoga Maritima Thymidine Kinase in the apo 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, C, D	Thymidine kinase	polymer	184	20684.9	4	UniProt (Q9WYN2) Pfam (PF00265) In PDB	Thermotoga maritima
2	A, B, C, D	ZINC ION	non-polymer		65.4	4	Chemie (ZN)
3	A, B, C, D	SULFATE ION	non-polymer		96.1	4	Chemie (SO4)
4		water	water		18.0	155	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	82739.7
Non-Polymers*	Number of molecules	8
	Total formula weight	645.9
All*	Total formula weight	83385.6

*Water molecules are not included.