1YR3

Escherichia coli purine nucleoside phosphorylase II, the product of the xapA gene

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, E...	Xanthosine phosphorylase	polymer	277	29865.6	6	UniProt (P45563) Pfam (PF01048) In PDB	Escherichia coli	PNP-II, PURINE NUCLEOSIDE PHOSPHORYLASE
2	A, B, C, D, E...	SULFATE ION	non-polymer		96.1	6	Chemie (SO4)
3	A, B, C, D, E...	XANTHINE	non-polymer		152.1	6	Chemie (XAN)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	179193.5
Non-Polymers*	Number of molecules	12
	Total formula weight	1489.0
All*	Total formula weight	180682.6

*Water molecules are not included.