1UK3

Crystal structure of SARS Coronavirus Main Proteinase (3CLpro) At pH7.6

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (A, B)	3C-like proteinase	polymer	306	33876.6	2	UniProt (P59641) Pfam (PF05409) UniProt (by SIFTS) (P0C6X7)	SARS coronavirus	SARS Coronavirus Main Proteinase, 3CLpro
2	C, D (A, B)	water	water		18.0	114	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	67753.3
All*	Total formula weight	67753.3

*Water molecules are not included.