2F9R

Crystal structure of the inactive state of the Smase I, a sphingomyelinase D from Loxosceles laeta venom

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 (A, B, C, D)	Sphingomyelinase D 1	polymer	285	32083.0	4	UniProt (Q8I914)	Loxosceles laeta	Sphingomyelinase I, SMase I
2	E, F, H, J (A, B, C, D)	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
3	G, I, K (B, C, D)	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID	non-polymer		238.3	3	Chemie (EPE)
4	L, M, N, O (A, B, C, D)	water	water		18.0	507	Chemie (HOH)

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	128331.8
Non-Polymers*	Number of molecules	7
	Total formula weight	812.1
All*	Total formula weight	129143.9

*Water molecules are not included.