2AFH

Crystal Structure of Nucleotide-Free Av2-Av1 Complex

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, C	Nitrogenase molybdenum-iron protein	polymer	491	55231.8	2	UniProt (P07328) Pfam (PF00148) In PDB	Azotobacter vinelandii	Nitrogenase component I, Dinitrogenase
2	B, D	Nitrogenase molybdenum-iron protein	polymer	522	59404.7	2	UniProt (P07329) Pfam (PF11844) Pfam (PF00148) In PDB	Azotobacter vinelandii	Nitrogenase component I, Dinitrogenase
3	E, F	Nitrogenase iron protein 1	polymer	289	31417.0	2	UniProt (P00459) Pfam (PF00142) In PDB	Azotobacter vinelandii	Nitrogenase component II, Nitrogenase Fe protein 1, Nitrogenase reductase
4	A, C	3-HYDROXY-3-CARBOXY-ADIPIC ACID	non-polymer		206.2	2	Chemie (HCA)
5	A, C	FE(7)-MO-S(9)-N CLUSTER	non-polymer		789.4	2	Chemie (CFN)
6	D, A, B, C	TRIETHYLENE GLYCOL	non-polymer		150.2	8	Chemie (PGE)
7	B, D	CALCIUM ION	non-polymer		40.1	2	Chemie (CA)
8	B	SODIUM ION	non-polymer		23.0	1	Chemie (NA)
9	B, C	FE(8)-S(7) CLUSTER	non-polymer		671.2	2	Chemie (CLF)
10	B, C	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL	non-polymer		122.1	2	Chemie (TRS)
11	E, B	TETRAETHYLENE GLYCOL	non-polymer		194.2	2	Chemie (PG4)
12	B, C	PENTAETHYLENE GLYCOL	non-polymer		238.3	2	Chemie (1PE)
13	D, B	DI(HYDROXYETHYL)ETHER	non-polymer		106.1	3	Chemie (PEG)
14	D	HEXAETHYLENE GLYCOL	non-polymer		282.3	1	Chemie (P6G)
15	E	IRON/SULFUR CLUSTER	non-polymer		351.6	1	Chemie (SF4)
16		water	water		18.0	2071	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	6
	Total formula weight	292107.2
Non-Polymers*	Number of molecules	28
	Total formula weight	6699.8
All*	Total formula weight	298806.9

*Water molecules are not included.