3PIE

Crystal structure of the 5'->3' exoribonuclease Xrn1, E178Q mutant

External Resource: Annotation

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: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	PIN domain-like	8105319	3001041	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2B (2022-06-29)
B	SCOP2 Family	XRN2-like	8051179	4007229	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	PIN domain-like	8105319	3001041	SCOP2 (2022-06-29)
C	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	PIN domain-like	8105319	3001041	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	PIN domain-like	8105319	3001041	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	5' to 3' exonuclease C-terminal subdomain	8105320	3000537	SCOP2B (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	PF18129	e3pieA6	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18129	ECOD (1.6)
A	PF18332	e3pieA4	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18332	ECOD (1.6)
A	PF18334	e3pieA5	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18334	ECOD (1.6)
A	PF17846	e3pieA2	A: alpha arrays	X: Helical domain in 5'->3' exoribonucleases (From Topology)	H: Helical domain in 5'->3' exoribonucleases (From Topology)	T: Helical domain in 5'->3' exoribonucleases	F: PF17846	ECOD (1.6)
A	F_UNCLASSIFIED	e3pieA3	A: a+b two layers	X: R3H domain-like	H: R3H-like domain in 5'->3' exoribonucleases (From Topology)	T: R3H-like domain in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
A	F_UNCLASSIFIED	e3pieA7	A: a+b three layers	X: C-terminal segment in 5'->3' exoribonucleases (From Topology)	H: C-terminal segment in 5'->3' exoribonucleases (From Topology)	T: C-terminal segment in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
A	PF03159	e3pieA1	A: a/b three-layered sandwiches	X: HAD domain-like	H: HAD domain-related	T: PIN domain-like	F: PF03159	ECOD (1.6)
B	PF18129	e3pieB2	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18129	ECOD (1.6)
B	PF18332	e3pieB4	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18332	ECOD (1.6)
B	PF18334	e3pieB6	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18334	ECOD (1.6)
B	PF17846	e3pieB7	A: alpha arrays	X: Helical domain in 5'->3' exoribonucleases (From Topology)	H: Helical domain in 5'->3' exoribonucleases (From Topology)	T: Helical domain in 5'->3' exoribonucleases	F: PF17846	ECOD (1.6)
B	F_UNCLASSIFIED	e3pieB5	A: a+b two layers	X: R3H domain-like	H: R3H-like domain in 5'->3' exoribonucleases (From Topology)	T: R3H-like domain in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
B	F_UNCLASSIFIED	e3pieB8	A: a+b three layers	X: C-terminal segment in 5'->3' exoribonucleases (From Topology)	H: C-terminal segment in 5'->3' exoribonucleases (From Topology)	T: C-terminal segment in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
B	PF03159	e3pieB3	A: a/b three-layered sandwiches	X: HAD domain-like	H: HAD domain-related	T: PIN domain-like	F: PF03159	ECOD (1.6)
C	PF18129	e3pieC4	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18129	ECOD (1.6)
C	PF18332	e3pieC2	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18332	ECOD (1.6)
C	PF18334	e3pieC5	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18334	ECOD (1.6)
C	PF17846	e3pieC6	A: alpha arrays	X: Helical domain in 5'->3' exoribonucleases (From Topology)	H: Helical domain in 5'->3' exoribonucleases (From Topology)	T: Helical domain in 5'->3' exoribonucleases	F: PF17846	ECOD (1.6)
C	F_UNCLASSIFIED	e3pieC1	A: a+b two layers	X: R3H domain-like	H: R3H-like domain in 5'->3' exoribonucleases (From Topology)	T: R3H-like domain in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
C	F_UNCLASSIFIED	e3pieC7	A: a+b three layers	X: C-terminal segment in 5'->3' exoribonucleases (From Topology)	H: C-terminal segment in 5'->3' exoribonucleases (From Topology)	T: C-terminal segment in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
C	PF03159	e3pieC3	A: a/b three-layered sandwiches	X: HAD domain-like	H: HAD domain-related	T: PIN domain-like	F: PF03159	ECOD (1.6)
D	PF18129	e3pieD5	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18129	ECOD (1.6)
D	PF18332	e3pieD3	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18332	ECOD (1.6)
D	PF18334	e3pieD4	A: beta barrels	X: SH3	H: SH3	T: SH3	F: PF18334	ECOD (1.6)
D	PF17846	e3pieD7	A: alpha arrays	X: Helical domain in 5'->3' exoribonucleases (From Topology)	H: Helical domain in 5'->3' exoribonucleases (From Topology)	T: Helical domain in 5'->3' exoribonucleases	F: PF17846	ECOD (1.6)
D	F_UNCLASSIFIED	e3pieD6	A: a+b two layers	X: R3H domain-like	H: R3H-like domain in 5'->3' exoribonucleases (From Topology)	T: R3H-like domain in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
D	F_UNCLASSIFIED	e3pieD8	A: a+b three layers	X: C-terminal segment in 5'->3' exoribonucleases (From Topology)	H: C-terminal segment in 5'->3' exoribonucleases (From Topology)	T: C-terminal segment in 5'->3' exoribonucleases	F: F_UNCLASSIFIED	ECOD (1.6)
D	PF03159	e3pieD1	A: a/b three-layered sandwiches	X: HAD domain-like	H: HAD domain-related	T: PIN domain-like	F: PF03159	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.1370.250	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S8	Chain: A, domain 1	CATH (4.3.0)
B	3.30.1370.250	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S8	Chain: A, domain 1	CATH (utative)
B	2.170.260.40	Mainly Beta	Beta Complex	paz domain		CATH (utative)
B	2.30.30.30	Mainly Beta	Roll	SH3 type barrels.		CATH (utative)
C	3.40.50.12390	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (4.3.0)
C	1.25.40.1050	Mainly Alpha	Alpha Horseshoe	Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat		CATH (4.3.0)
C	3.30.1370.250	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S8	Chain: A, domain 1	CATH (4.3.0)
C	2.170.260.40	Mainly Beta	Beta Complex	paz domain		CATH (4.3.0)
C	2.30.30.30	Mainly Beta	Roll	SH3 type barrels.		CATH (4.3.0)
C	6.10.140.950	Special	Helix non-globular	Helix Hairpins		CATH (4.3.0)
C	1.20.5.2620	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces		CATH (4.3.0)
C	2.30.30.750	Mainly Beta	Roll	SH3 type barrels.		CATH (4.3.0)
D	3.30.1370.250	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S8	Chain: A, domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF18334	Exoribonuclease Xrn1 D2/D3 domain (XRN1_D2_D3)	Exoribonuclease Xrn1 D2/D3 domain	This domain can be found in 5' to 3' exoribonuclease 1 (XRN1) which belong to a family of conserved enzymes in eukaryotes and have important functions in transcription, RNA metabolism, and RNA interference. Xrn1 in fungi and animals is primarily cyto ...	This domain can be found in 5' to 3' exoribonuclease 1 (XRN1) which belong to a family of conserved enzymes in eukaryotes and have important functions in transcription, RNA metabolism, and RNA interference. Xrn1 in fungi and animals is primarily cytosolic, involved in degradation of decapped mRNAs, nonsense mediated decay, microRNA decay and is essential for proper development. The Xrn1 homolog in Drosophila, known as Pacman, is required for male fertility [1]. This entry relates to domain 2 and 3 combined which can be found in the 510-residue C-terminal extension found in XRN1 and not in XRN2/Rat1. Domain D2 is formed by two stretches of Xrn1, residues 915-960 and 1134-1151. The presence of domain (D3) is suggested based on structure. This domain is formed by residues 979-1109, in the insert of domain D2. It is suggested that domains D2-D4 may help maintain domain D1 Pfam:PF18332 in the correct conformation, thereby indirectly stabilising the conformation of the N-terminal segment Pfam:PF03159 [1].	Domain
A, B, C, D	PF18332	Exoribonuclease Xrn1 D1 domain (XRN1_D1)	Exoribonuclease Xrn1 D1 domain	This domain can be found in 5' to 3' exoribonuclease 1 (XRN1) which belong to a family of conserved enzymes in eukaryotes and have important functions in transcription, RNA metabolism, and RNA interference. Xrn1 in fungi and animals is primarily cyto ...	This domain can be found in 5' to 3' exoribonuclease 1 (XRN1) which belong to a family of conserved enzymes in eukaryotes and have important functions in transcription, RNA metabolism, and RNA interference. Xrn1 in fungi and animals is primarily cytosolic and is involved in degradation of decapped mRNAs, nonsense mediated decay, microRNA decay and is essential for proper development. The Xrn1 homolog in Drosophila, known as Pacman, is required for male fertility [1]. This domain (D1) along with 3 other domains, make up a 510-residue segment following the conserved regions found in XRNs but they are only present in XRN1 and are absent in Rat1/XRN2. The amino acid sequences of these four domains contain an excess of basic residues, suggesting that these domains might help in binding the RNA substrate. Mutational studies carried out in D1 domain show that the mutant forms had dramatically reduced nuclease activity towards ssDNA substrate indicating that domain D1 is required for Xrn1 nuclease activity [1].	Domain
A, B, C, D	PF18129	Xrn1 SH3-like domain (SH3_12)	Xrn1 SH3-like domain	This is the C-terminal SH3-like domain which can be found in the exoribonuclease Xrn1. Xrn1 is a 175 kDa processive exoribonuclease that is conserved from yeast to mammals which targets cytoplasmic RNA substrates marked by a 5' monophosphate for proc ...	This is the C-terminal SH3-like domain which can be found in the exoribonuclease Xrn1. Xrn1 is a 175 kDa processive exoribonuclease that is conserved from yeast to mammals which targets cytoplasmic RNA substrates marked by a 5' monophosphate for processive 5'-to-3' degradation. The Sh3-like domain in Xrn1 lacks the canonical SH3 residues normally involved in binding proline-rich peptide motifs and instead engages in non-canonical interactions with the catalytic domain. Additionally it is essential in maintaining the structural integrity of Xrn1, since partial truncation of this domain in yeast Xrn1 yields an inactive protein. There is a long loop projecting from the SH3-like domain that contacts the PAZ/Tudor domain, occluding the functional surface that binds RNA or peptide motifs containing methylated arginines, respectively, in canonical PAZ and Tudor domain [1].	Domain
A, B, C, D	PF17846	Xrn1 helical domain (XRN_M)	Xrn1 helical domain	This helical domain is part of the Xrn1 catalytic core [1]. Xrn1 is a cytoplasmic 5'-3' exonuclease that degrades decapped mRNAs.	Domain
A, B, C, D	PF03159	XRN 5'-3' exonuclease N-terminus (XRN_N)	XRN 5'-3' exonuclease N-terminus	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	5'->3' EXORIBONUCLEASE (Xrn1)	5'-3' RNA exonuclease activity 5'-3' exonuclease activity catalytic activity, acting on RNA RNA exonuclease activity, producing 5'-phosphomonoesters catalytic activity, acting on a nucleic acid RNA exonuclease activity RNA nuclease activity hydrolase activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters nuclease activity hydrolase activity, acting on ester bonds exonuclease activity catalytic activity RNA binding 5'-3' RNA exonuclease activity 5'-3' exonuclease activity catalytic activity, acting on RNA RNA exonuclease activity, producing 5'-phosphomonoesters catalytic activity, acting on a nucleic acid RNA exonuclease activity RNA nuclease activity hydrolase activity exonuclease activity, active with either ribo- or deoxyribonucleic acids and producing 5'-phosphomonoesters nuclease activity hydrolase activity, acting on ester bonds exonuclease activity catalytic activity RNA binding binding organic cyclic compound binding nucleic acid binding cation binding ion binding metal ion binding small molecule binding	ribonucleoprotein complex biogenesis cellular biosynthetic process RNA metabolic process rRNA processing nucleobase-containing compound metabolic process cellular component biogenesis ribosome biogenesis organic substance metabolic process organic substance biosynthetic process cellular component organization or biogenesis RNA processing rRNA metabolic process cellular metabolic process primary metabolic process ribonucleoprotein complex biogenesis cellular biosynthetic process RNA metabolic process rRNA processing nucleobase-containing compound metabolic process cellular component biogenesis ribosome biogenesis organic substance metabolic process organic substance biosynthetic process cellular component organization or biogenesis RNA processing rRNA metabolic process cellular metabolic process primary metabolic process gene expression macromolecule biosynthetic process nucleic acid metabolic process organic cyclic compound metabolic process biosynthetic process ncRNA metabolic process nucleic acid catabolic process metabolic process cellular process macromolecule metabolic process regulation of cellular process catabolic process nuclear-transcribed mRNA catabolic process, nonsense-mediated decay negative regulation of biological process negative regulation of cellular metabolic process macromolecule catabolic process negative regulation of cellular process RNA catabolic process negative regulation of macromolecule metabolic process regulation of biosynthetic process mRNA catabolic process nuclear-transcribed mRNA catabolic process regulation of biological process negative regulation of metabolic process biological regulation regulation of cellular metabolic process regulation of macromolecule metabolic process mRNA metabolic process negative regulation of cellular biosynthetic process organic cyclic compound catabolic process nucleobase-containing compound catabolic process regulation of cellular biosynthetic process regulation of gene expression negative regulation of gene expression negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process regulation of metabolic process organic substance catabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR041106	Exoribonuclease Xrn1, D2/D3 domain	Domain
A, B, C, D	IPR014722	Large ribosomal subunit protein uL2, domain 2	Homologous Superfamily
A, B, C, D	IPR016494	5'-3' exoribonuclease 1	Family
A, B, C, D	IPR040992	5'-3' exoribonuclease 1, D1 domain	Domain
A, B, C, D	IPR047007	5'-3' exoribonuclease 1, D1 domain superfamily	Homologous Superfamily
A, B, C, D	IPR047008	5'-3' exoribonuclease 1, SH3-like domain superfamily	Homologous Superfamily
A, B, C, D	IPR027073	5'-3' exoribonuclease	Family
A, B, C, D	IPR041385	5'-3' exoribonuclease 1, SH3-like domain	Domain
A, B, C, D	IPR041412	Xrn1, helical domain	Domain
A, B, C, D	IPR004859	Xrn1, N-terminal	Domain