7QQA

MgADP-bound Fe protein of the iron-only nitrogenase from Azotobacter vinelandii

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 (A, B, C, D)	Nitrogenase iron protein	polymer	274	29959.3	4	UniProt (C1DK95) Pfam (PF00142)	Azotobacter vinelandii	Nitrogenase Fe protein,Nitrogenase component II,Nitrogenase reductase
2	E, H, J, M (A, B, C, D)	ADENOSINE-5'-DIPHOSPHATE	non-polymer		427.2	4	Chemie (ADP)
3	F, I, K, N (A, B, C, D)	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
4	G, L (A, C)	IRON/SULFUR CLUSTER	non-polymer		351.6	2	Chemie (SF4)
5	O, P, Q, R (A, B, C, D)	water	water		18.0	762	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	119837.2
Non-Polymers*	Number of molecules	10
	Total formula weight	2509.3
All*	Total formula weight	122346.5

*Water molecules are not included.