2Z0G

The crystal structure of PII protein

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	Nitrogen regulatory protein P-II	polymer	112	12515.6	4	UniProt (O66513) Pfam (PF00543) In PDB	Aquifex aeolicus
2	A, B, C, D	PHOSPHATE ION	non-polymer		95.0	10	Chemie (PO4)
3	A, D	CHLORIDE ION	non-polymer		35.5	2	Chemie (CL)
4		water	water		18.0	139	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	50062.3
Non-Polymers*	Number of molecules	12
	Total formula weight	1020.6
All*	Total formula weight	51082.9

*Water molecules are not included.