7ADR

CO bound as bridging ligand at the active site of vanadium nitrogenase VFe protein

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, D (A, D)	Nitrogenase vanadium-iron protein alpha chain	polymer	474	53951.6	2	UniProt (P16855) Pfam (PF00148)	Azotobacter vinelandii	Dinitrogenase 2 subunit alpha,Nitrogenase component I
2	B, E (B, E)	Nitrogenase vanadium-iron protein beta chain	polymer	475	52839.5	2	UniProt (P16856) Pfam (PF00148)	Azotobacter vinelandii	Dinitrogenase 2 subunit beta,Nitrogenase component I
3	C, F (C, F)	Nitrogenase vanadium-iron protein delta chain	polymer	113	13388.0	2	UniProt (P16857) Pfam (PF03139)	Azotobacter vinelandii	Dinitrogenase 2 subunit delta,Nitrogenase component I
4	G, U (A, D)	FeV	non-polymer		692.3	2	Chemie (D6N)
5	H, V (A, D)	3-HYDROXY-3-CARBOXY-ADIPIC ACID	non-polymer		206.2	2	Chemie (HCA)
6	I, W (A, D)	BICARBONATE ION	non-polymer		61.0	2	Chemie (BCT)
7	J, X (A, D)	CARBON MONOXIDE	non-polymer		28.0	2	Chemie (CMO)
8	K, L, Y (A, D)	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL	non-polymer		122.1	3	Chemie (TRS)
9	M, Z (B, E)	FE(8)-S(7) CLUSTER	non-polymer		671.2	2	Chemie (CLF)
10	EA, N, O, S (F, B, C)	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
11	AA, BA, CA, DA, FA... (E, F, B, C)	1,2-ETHANEDIOL	non-polymer		62.1	9	Chemie (EDO)
12	GA, HA, IA, JA, KA... (A, B, C, D, E...)	water	water		18.0	2550	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	240358.0
Non-Polymers*	Number of molecules	26
	Total formula weight	4339.7
All*	Total formula weight	244697.7

*Water molecules are not included.