7E5X

THE CRYSTAL STRUCTURE OF COVID-19 MAIN PROTEASE apo form at 2.2 angstrom

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	3C-like proteinase	polymer	306	33825.5	4	UniProt (P0DTD1) Pfam (PF05409) In PDB	Severe acute respiratory syndrome coronavirus 2 (2019-nCoV SARS-CoV-2)
2		water	water		18.0	82	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	135302.2
All*	Total formula weight	135302.2

*Water molecules are not included.