Annotations: 1IRX

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1irxa1	All alpha proteins	An anticodon-binding domain of class I aminoacyl-tRNA synthetases	An anticodon-binding domain of class I aminoacyl-tRNA synthetases	C-terminal domain of class I lysyl-tRNA synthetase	C-terminal domain of class I lysyl-tRNA synthetase	(Pyrococcus horikoshii ) [TaxId: 53953 ],	SCOPe (2.08)
A	d1irxa2	Alpha and beta proteins (a/b)	Adenine nucleotide alpha hydrolase-like	Nucleotidylyl transferase	Class I aminoacyl-tRNA synthetases (RS), catalytic domain	Class I lysyl-tRNA synthetase	(Pyrococcus horikoshii ) [TaxId: 53953 ],	SCOPe (2.08)
B	d1irxb1	All alpha proteins	An anticodon-binding domain of class I aminoacyl-tRNA synthetases	An anticodon-binding domain of class I aminoacyl-tRNA synthetases	C-terminal domain of class I lysyl-tRNA synthetase	C-terminal domain of class I lysyl-tRNA synthetase	(Pyrococcus horikoshii ) [TaxId: 53953 ],	SCOPe (2.08)
B	d1irxb2	Alpha and beta proteins (a/b)	Adenine nucleotide alpha hydrolase-like	Nucleotidylyl transferase	Class I aminoacyl-tRNA synthetases (RS), catalytic domain	Class I lysyl-tRNA synthetase	(Pyrococcus horikoshii ) [TaxId: 53953 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	C-terminal domain of class I lysyl-tRNA synthetase	8027308	4001958	SCOP2 (2022-06-29)
A	SCOP2 Family	Class I aminoacyl-tRNA synthetases (RS), catalytic domain	8027311	4003807	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	An anticodon-binding domain of class I aminoacyl-tRNA synthetases	8039687	3000922	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Nucleotidylyl transferase	8039690	3001541	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Nucleotidylyl transferase	8039690	3001541	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	An anticodon-binding domain of class I aminoacyl-tRNA synthetases	8039687	3000922	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	tRNA-synt_1f_1st,LysS	e1irxA1	A: alpha arrays	X: HTH	H: An anticodon-binding domain of class I aminoacyl-tRNA synthetases (From Topology)	T: An anticodon-binding domain of class I aminoacyl-tRNA synthetases	F: tRNA-synt_1f_1st,LysS	ECOD (1.6)
A	tRNA-synt_1f_1st	e1irxA3	A: a/b three-layered sandwiches	X: HUP domain-like	H: HUP domains (From Topology)	T: HUP domains	F: tRNA-synt_1f_1st	ECOD (1.6)
A	tRNA-synt_1f_2nd	e1irxA4	A: few secondary structure elements	X: Rubredoxin-like	H: Rubredoxin-related	T: Rubredoxin-related	F: tRNA-synt_1f_2nd	ECOD (1.6)
B	tRNA-synt_1f_1st,LysS	e1irxB3	A: alpha arrays	X: HTH	H: An anticodon-binding domain of class I aminoacyl-tRNA synthetases (From Topology)	T: An anticodon-binding domain of class I aminoacyl-tRNA synthetases	F: tRNA-synt_1f_1st,LysS	ECOD (1.6)
B	tRNA-synt_1f_1st	e1irxB2	A: a/b three-layered sandwiches	X: HUP domain-like	H: HUP domains (From Topology)	T: HUP domains	F: tRNA-synt_1f_1st	ECOD (1.6)
B	tRNA-synt_1f_2nd	e1irxB1	A: few secondary structure elements	X: Rubredoxin-like	H: Rubredoxin-related	T: Rubredoxin-related	F: tRNA-synt_1f_2nd	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.620	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	HUPs	CATH (4.3.0)
A	2.30.30.300	Mainly Beta	Roll	SH3 type barrels.	class i lysyl-tRNA synthetase like	CATH (4.3.0)
A	6.10.20.10	Special	Helix non-globular	Arc Repressor Mutant, subunit A	Lysine tRNA ligase, stem contact fold domain	CATH (4.3.0)
A	1.10.10.770	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A		CATH (4.3.0)
A	1.10.10.350	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A		CATH (4.3.0)
B	3.40.50.620	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	HUPs	CATH (4.3.0)
B	2.30.30.300	Mainly Beta	Roll	SH3 type barrels.	class i lysyl-tRNA synthetase like	CATH (4.3.0)
B	6.10.20.10	Special	Helix non-globular	Arc Repressor Mutant, subunit A	Lysine tRNA ligase, stem contact fold domain	CATH (4.3.0)
B	1.10.10.770	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A		CATH (4.3.0)
B	1.10.10.350	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF19269	Anticodon binding domain (Anticodon_2)	Anticodon binding domain	This entry represents the anticodon binding domain found at the C-terminus of the class-I glutamyl tRNA synthetase enzyme.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	lysyl-tRNA synthetase	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding ligase activity, forming carbon-oxygen bonds aminoacyl-tRNA ligase activity catalytic activity, acting on RNA catalytic activity, acting on a nucleic acid catalytic activity, acting on a tRNA lysine-tRNA ligase activity catalytic activity ligase activity RNA binding tRNA binding nucleic acid binding cation binding metal ion binding	lysyl-tRNA aminoacylation amino acid activation organonitrogen compound metabolic process tRNA aminoacylation cellular biosynthetic process cellular metabolic process organonitrogen compound biosynthetic process RNA metabolic process primary metabolic process amino acid metabolic process translation gene expression tRNA aminoacylation for protein translation macromolecule biosynthetic process nucleic acid metabolic process lysyl-tRNA aminoacylation amino acid activation organonitrogen compound metabolic process tRNA aminoacylation cellular biosynthetic process cellular metabolic process organonitrogen compound biosynthetic process RNA metabolic process primary metabolic process amino acid metabolic process translation gene expression tRNA aminoacylation for protein translation macromolecule biosynthetic process nucleic acid metabolic process tRNA metabolic process nucleobase-containing compound metabolic process biosynthetic process metabolic process cellular process macromolecule metabolic process protein metabolic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR020751	Aminoacyl-tRNA synthetase, class I, anticodon-binding domain, subdomain 2	Homologous Superfamily
A, B	IPR001412	Aminoacyl-tRNA synthetase, class I, conserved site	Conserved Site
A, B	IPR002904	Lysine-tRNA ligase	Family
A, B	IPR014729	Rossmann-like alpha/beta/alpha sandwich fold	Homologous Superfamily
A, B	IPR045462	Aminoacyl-tRNA synthetase, class I, anticodon-binding	Domain
A, B	IPR008925	Aminoacyl-tRNA synthetase, class I, anticodon-binding superfamily	Homologous Superfamily
A, B	IPR042078	Lysine tRNA ligase, stem contact fold domain	Homologous Superfamily

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.