1NUL

XPRTASE FROM E. COLI

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)	XANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE	polymer	152	16991.6	2	UniProt (P0A9M5) Pfam (PF00156)	Escherichia coli	XPRT
2	C, E (A, B)	SULFATE ION	non-polymer		96.1	2	Chemie (SO4)
3	D, F (A, B)	MAGNESIUM ION	non-polymer		24.3	2	Chemie (MG)
4	G, H (A, B)	water	water		18.0	212	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	33983.1
Non-Polymers*	Number of molecules	4
	Total formula weight	240.7
All*	Total formula weight	34223.9

*Water molecules are not included.