Annotations: 3S4L

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Cas3_HD	e3s4lA1	A: a/b three-layered sandwiches	X: Membrane attack complex/perforin (MACPF) and cholesterol-dependent cytolysin (CDC) domains	H: SH3	T: SH3	F: Cas3_HD	ECOD (v294.1)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.3210.30	Mainly Alpha	Orthogonal Bundle	Hypothetical protein af1432		CATH (4.3.0)

Chains	Accession	Name	Description	Comments	Source
A	PF18019	Cas3, HD domain (Cas3_HD)	Cas3, HD domain	This HD domain is found at the N-terminus of Cas3 enzymes fused to a helicase domain. This domain is sometimes found as a separate protein. It acts as a nuclease that cleaves ssDNA.	Domain

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	CAS3 Metal dependent phosphohydrolase	hydrolase activity, acting on ester bonds nuclease activity catalytic activity, acting on a nucleic acid hydrolase activity exonuclease activity catalytic activity endonuclease activity cation binding ion binding binding metal ion binding small molecule binding	biological process involved in interspecies interaction between organisms defense response to virus response to stimulus defense response response to other organism response to stress response to external stimulus response to external biotic stimulus response to virus response to biotic stimulus	-