1XIK

RIBONUCLEOSIDE-DIPHOSPHATE REDUCTASE 1 BETA CHAIN

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B	PROTEIN R2 OF RIBONUCLEOTIDE REDUCTASE	polymer	375	43426.9	2	UniProt (P69924) Pfam (PF00268) In PDB	Escherichia coli	RNR R2
2	A, B	FE (II) ION	non-polymer		55.8	4	Chemie (FE2)
3	A, B	MERCURY (II) ION	non-polymer		200.6	10	Chemie (HG)
4		water	water		18.0	326	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	86853.7
Non-Polymers*	Number of molecules	14
	Total formula weight	2229.3
All*	Total formula weight	89083.0

*Water molecules are not included.