1M0I

Crystal Structure of Bacteriophage T7 Endonuclease I with a Wild-Type Active Site

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	endodeoxyribonuclease I	polymer	138	16069.5	4	UniProt (P00641) Pfam (PF05367) In PDB	Enterobacteria phage T7	endonuclease
2	A, B, C	SULFATE ION	non-polymer		96.1	3	Chemie (SO4)
3		water	water		18.0	53	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	64278.0
Non-Polymers*	Number of molecules	3
	Total formula weight	288.2
All*	Total formula weight	64566.1

*Water molecules are not included.