Annotations: 2NUB

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2nuba1	All beta proteins	SH3-like barrel	PAZ domain	PAZ domain	Argonaute homologue Aq_1447	(Aquifex aeolicus ) [TaxId: 63363 ],	SCOPe (2.08)
A	d2nuba3	Alpha and beta proteins (a/b)	Phosphotyrosine protein phosphatases I-like	PIWI domain N-terminal-like	PIWI domain N-terminal	Argonaute homologue Aq_1447	(Aquifex aeolicus ) [TaxId: 63363 ],	SCOPe (2.08)
A	d2nuba4	Alpha and beta proteins (a/b)	Ribonuclease H-like motif	Ribonuclease H-like	PIWI domain C-terminal	Argonaute homologue Aq_1447	(Aquifex aeolicus ) [TaxId: 63363 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	RNA-binding domain RBD	8053612	3000110	SCOP2B (2021-05-27)
A	SCOP2B Superfamily	PAZ domain	8034965	3001750	SCOP2B (2021-05-27)
A	SCOP2B Superfamily	Ribonuclease H-like	8034967	3000143	SCOP2B (2021-05-27)
A	SCOP2B Superfamily	Mid domain of argonaute	8053613	3002210	SCOP2B (2021-05-27)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF18349	e2nubA4	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18349	ECOD (1.6)
A	F_UNCLASSIFIED	e2nubA6	A: a+b two layers	X: Alpha-beta plaits	H: Argonaute, N-terminal domain (From Topology)	T: Argonaute, N-terminal domain	F: F_UNCLASSIFIED	ECOD (1.6)
A	PF22430	e2nubA5	A: a+b two layers	X: Alpha-beta plaits	H: Argonaute, N-terminal domain (From Topology)	T: Argonaute, N-terminal domain	F: PF22430	ECOD (1.6)
A	PF02171	e2nubA2	A: a/b three-layered sandwiches	X: Middle domain in Argonaute homologs (From Topology)	H: Middle domain in Argonaute homologs (From Topology)	T: Middle domain in Argonaute homologs	F: PF02171	ECOD (1.6)
A	PF02171	e2nubA3	A: mixed a+b and a/b	X: Ribonuclease H-like	H: Ribonuclease H-like (From Topology)	T: Ribonuclease H-like	F: PF02171	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.30.340.10	Mainly Beta	Roll	PAZ domain fold	PAZ domain superfamily	CATH (4.3.0)
A	3.40.50.2300	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Response regulator	CATH (4.3.0)
A	3.30.420.10	Alpha Beta	2-Layer Sandwich	Nucleotidyltransferase	domain 5	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02171	Piwi domain (Piwi)	Piwi domain	-	Family
A	PF22430	Ago, N-terminal domain (Aa-Ago_N)	Ago, N-terminal domain	This entry represents the N-terminal domain of Argonaute (Ago) from Aquifex aeolicus. This domain is composed of an antiparallel five-stranded beta sheet core that has one alpha helix positioned along one face of the sheet. Ago use short ssDNA sequen ...	This entry represents the N-terminal domain of Argonaute (Ago) from Aquifex aeolicus. This domain is composed of an antiparallel five-stranded beta sheet core that has one alpha helix positioned along one face of the sheet. Ago use short ssDNA sequences as guides (gDNA) to bind complementary target strands, resulting in cleavage of the target RNA [1,2].	Domain
A	PF18349	PAZ domain (PAZ_4)	PAZ domain	This is a Paz domain found in Argonaute proteins from Aquifex aeolicus bacteria. The PAZ core fold in Aquifex aeolicus bacteria Ago (Aa-Ago) proteins is closely related to the human hAgo1 PAZ domain [1]. Structural and functional studies of Aa-Ago in ...	This is a Paz domain found in Argonaute proteins from Aquifex aeolicus bacteria. The PAZ core fold in Aquifex aeolicus bacteria Ago (Aa-Ago) proteins is closely related to the human hAgo1 PAZ domain [1]. Structural and functional studies of Aa-Ago indicate that conformational rearrangement of the PAZ domain may be critical for the catalytic cycle of Argonaute and the RNA-induced silencing complex [3].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Argonaute	DNA binding binding organic cyclic compound binding nucleic acid binding endonuclease activity nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on RNA RNA endonuclease activity catalytic activity, acting on a nucleic acid RNA nuclease activity hydrolase activity catalytic activity RNA binding DNA binding binding organic cyclic compound binding nucleic acid binding endonuclease activity nuclease activity hydrolase activity, acting on ester bonds catalytic activity, acting on RNA RNA endonuclease activity catalytic activity, acting on a nucleic acid RNA nuclease activity hydrolase activity catalytic activity RNA binding single-stranded RNA binding regulatory RNA binding miRNA binding cation binding ion binding metal ion binding small molecule binding	regulation of cellular process cellular biosynthetic process negative regulation of biological process negative regulation of cellular metabolic process post-transcriptional regulation of gene expression negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process cellular metabolic process negative regulation of metabolic process biological regulation regulation of cellular metabolic process regulation of macromolecule metabolic process regulation of cellular process cellular biosynthetic process negative regulation of biological process negative regulation of cellular metabolic process post-transcriptional regulation of gene expression negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process cellular metabolic process negative regulation of metabolic process biological regulation regulation of cellular metabolic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulatory ncRNA-mediated post-transcriptional gene silencing negative regulation of cellular biosynthetic process regulatory ncRNA-mediated gene silencing regulation of cellular biosynthetic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process post-transcriptional gene silencing regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process regulation of metabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR036397	Ribonuclease H superfamily	Homologous Superfamily
A	IPR003100	PAZ domain	Domain
A	IPR036085	PAZ domain superfamily	Homologous Superfamily
A	IPR003165	Piwi domain	Domain
A	IPR012337	Ribonuclease H-like superfamily	Homologous Superfamily
A	IPR041659	Argonaute, PAZ domain, Aquifex	Domain

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 R01GM133198.