1XX1

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	F_UNCLASSIFIED	e1xx1B1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: F_UNCLASSIFIED	ECOD (1.6)
C	F_UNCLASSIFIED	e1xx1C1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: F_UNCLASSIFIED	ECOD (1.6)
A	F_UNCLASSIFIED	e1xx1A1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: F_UNCLASSIFIED	ECOD (1.6)
D	F_UNCLASSIFIED	e1xx1D1	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: F_UNCLASSIFIED	ECOD (1.6)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.20.20.190	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Phosphatidylinositol (PI) phosphodiesterase	CATH (4.3.0)
C	3.20.20.190	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Phosphatidylinositol (PI) phosphodiesterase	CATH (4.3.0)
A	3.20.20.190	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Phosphatidylinositol (PI) phosphodiesterase	CATH (4.3.0)
D	3.20.20.190	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Phosphatidylinositol (PI) phosphodiesterase	CATH (4.3.0)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Sphingomyelinase I	lyase activity catalytic activity phosphoric ester hydrolase activity hydrolase activity, acting on ester bonds phosphoric diester hydrolase activity hydrolase activity cation binding ion binding binding metal ion binding small molecule binding toxin activity	lipid catabolic process organic substance metabolic process catabolic process primary metabolic process metabolic process organic substance catabolic process lipid metabolic process biological process involved in interspecies interaction between organisms cellular process disruption of cell in another organism disruption of anatomical structure in another organism killing of cells of another organism cell killing	extracellular region cellular anatomical entity