1S2N

Crystal structure of a cold adapted subtilisin-like serine proteinase

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)	extracellular subtilisin-like serine proteinase	polymer	284	29002.4	2	UniProt (Q8GB52) Pfam (PF00082)	Vibrio sp. PA-44
2	C, D, E, G, H... (A, B)	CALCIUM ION	non-polymer		40.1	6	Chemie (CA)
3	F, J (A, B)	phenylmethanesulfonic acid	non-polymer		172.2	2	Chemie (PMS)
4	K, L (A, B)	water	water		18.0	378	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	58004.8
Non-Polymers*	Number of molecules	8
	Total formula weight	584.9
All*	Total formula weight	58589.7

*Water molecules are not included.