2O09

Crystal structure of the H-NOX domain from Nostoc sp. PCC 7120

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	Alr2278 protein	polymer	189	21213.6	2	UniProt (Q8YUQ7) Pfam (PF07700) In PDB	Nostoc sp.
2	A, B	PROTOPORPHYRIN IX CONTAINING FE	non-polymer		616.5	2	Chemie (HEM)
3		water	water		18.0	229	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	42427.3
Non-Polymers*	Number of molecules	2
	Total formula weight	1233.0
All*	Total formula weight	43660.3

*Water molecules are not included.