6EN9

E. coli Hydrogenase-2 (hydrogen reduced form)

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	S, T	Hydrogenase-2 small chain	polymer	298	32371.5	2	UniProt (P69741) Pfam (PF01058) Pfam (PF14720) In PDB	Escherichia coli	HYD2,Membrane-bound hydrogenase 2 small subunit,NiFe hydrogenase
2	L, M	Hydrogenase-2 large chain	polymer	567	62557.9	2	UniProt (P0ACE0) Pfam (PF00374) In PDB	Escherichia coli	HYD2,Membrane-bound hydrogenase 2 large subunit,NiFe hydrogenase
3	S, T	IRON/SULFUR CLUSTER	non-polymer		351.6	4	Chemie (SF4)
4	S, T	FE3-S4 CLUSTER	non-polymer		295.8	2	Chemie (F3S)
5	S, T	SULFATE ION	non-polymer		96.1	2	Chemie (SO4)
6	L, M	CARBONMONOXIDE-(DICYANO) IRON	non-polymer		135.9	2	Chemie (FCO)
7	L, M	NICKEL (II) ION	non-polymer		58.7	2	Chemie (NI)
8	L, M	MAGNESIUM ION	non-polymer		24.3	2	Chemie (MG)
9		water	water		18.0	1113	Chemie (HOH)

Sequence modifications

S, T: 2 - 294 (UniProt: P69741)

PDB	External Database	Details
His 294	Asn 331	conflict
His 295	-	expression tag
His 296	-	expression tag
His 297	-	expression tag
His 298	-	expression tag
His 299	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	189858.8
Non-Polymers*	Number of molecules	14
	Total formula weight	2628.1
All*	Total formula weight	192486.9

*Water molecules are not included.