2I71

Crystal structure of a Conserved Protein of Unknown Function from Sulfolobus solfataricus P2

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2i71a1	Multi-domain proteins (alpha and beta)	SSO1389-like	SSO1389-like	Cas_DxTHG	Hypothetical protein SSO1389	(Saccharolobus solfataricus P2 ) [TaxId: 273057 ],	SCOPe (2.08)
A	d2i71a2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Saccharolobus solfataricus P2 ) [TaxId: 273057 ],	SCOPe (2.08)
B	d2i71b2	Multi-domain proteins (alpha and beta)	SSO1389-like	SSO1389-like	Cas_DxTHG	Hypothetical protein SSO1389	(Saccharolobus solfataricus P2 ) [TaxId: 273057 ],	SCOPe (2.08)
B	d2i71b3	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Saccharolobus solfataricus P2 ) [TaxId: 273057 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	PIN domain-like	8044592	3001041	SCOP2B (2022-06-29)
B	SCOP2 Family	Cas DxTHG	8044591	4000184	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	PIN domain-like	8044592	3001041	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Csx1_III-U	e2i71A3	A: alpha bundles	X: Four-helical up-and-down bundle	H: HEPN	T: HEPN domain in CRISPR-associated protein Csx1	F: Csx1_III-U	ECOD (1.6)
A	Cas_DxTHG	e2i71A4	A: a/b three-layered sandwiches	X: CARF (CRISPR-associated Rossmann fold) domains (From Topology)	H: CARF (CRISPR-associated Rossmann fold) domains (From Topology)	T: CARF (CRISPR-associated Rossmann fold) domains	F: Cas_DxTHG	ECOD (1.6)
B	Csx1_III-U	e2i71B2	A: alpha bundles	X: Four-helical up-and-down bundle	H: HEPN	T: HEPN domain in CRISPR-associated protein Csx1	F: Csx1_III-U	ECOD (1.6)
B	Cas_DxTHG	e2i71B1	A: a/b three-layered sandwiches	X: CARF (CRISPR-associated Rossmann fold) domains (From Topology)	H: CARF (CRISPR-associated Rossmann fold) domains (From Topology)	T: CARF (CRISPR-associated Rossmann fold) domains	F: Cas_DxTHG	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.10640	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	SSO1389-like	CATH (4.3.0)
A	1.10.3740.10	Mainly Alpha	Orthogonal Bundle	SSO1389-like fold	SSO1389-like domains	CATH (4.3.0)
B	3.40.50.10640	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	SSO1389-like	CATH (4.3.0)
B	1.10.3740.10	Mainly Alpha	Orthogonal Bundle	SSO1389-like fold	SSO1389-like domains	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF09455	CRISPR system endoribonuclease Csx1, HEPN domain (Csx1_HEPN)	CRISPR system endoribonuclease Csx1, HEPN domain	CRISPR system endoribonuclease Csx1 is a metal-independent, endoribonuclease that acts selectively on ssRNA and cleaves specifically after adenosines, as part of the type III-B CRISP-Cas system and it is homologous to Csm6 [1-3], sharing the same dom ...	CRISPR system endoribonuclease Csx1 is a metal-independent, endoribonuclease that acts selectively on ssRNA and cleaves specifically after adenosines, as part of the type III-B CRISP-Cas system and it is homologous to Csm6 [1-3], sharing the same domain domain architecture consisting of a CARF domain at the N-terminal that is relatively well conserved, and a HEPN nuclease domain at the C-terminal. This entry represents the HEPN domain, which is has less conservation except for the typical R-X4-H motif [1-3].	Domain
A, B	PF22230	CRISPR system endoribonuclease Csx1, CARF domain (Csx1_CARF)	CRISPR system endoribonuclease Csx1, CARF domain	CRISPR system endoribonuclease Csx1 is a metal-independent, endoribonuclease that acts selectively on ssRNA and cleaves specifically after adenosines, as part of the type III-B CRISP-Cas system and it is homologous to Csm6 [1-3], sharing the same dom ...	CRISPR system endoribonuclease Csx1 is a metal-independent, endoribonuclease that acts selectively on ssRNA and cleaves specifically after adenosines, as part of the type III-B CRISP-Cas system and it is homologous to Csm6 [1-3], sharing the same domain domain architecture consisting of a CARF domain at the N-terminal that is relatively well conserved, and a HEPN nuclease domain at the C-terminal. This entry represents the CARF (CRISPR-associated Rossmann fold) domain, which binds and cleaves the cyclic oligoadenylate molecule (cA) that then activates the HEPN domain.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Hypothetical protein	endonuclease activity nuclease activity hydrolase activity, acting on ester bonds hydrolase activity catalytic activity	biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR019016	CRISPR system endoribonuclease Csx1-like, HEPN domain	Domain
A, B	IPR052875	CRISPR-associated endoribonuclease	Family
A, B	IPR010171	CRISPR system endoribonuclease Csx1	Family
A, B	IPR053857	CRISPR system endoribonuclease Csx1, CARF domain	Domain
A, B	IPR027419	CRISPR-associated protein Csx1, C-terminal	Homologous Superfamily
A, B	IPR013383	CRISPR-associated protein DxTHG, conserved site	Conserved Site

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.