Annotations: 1ILE

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1ilea1	All alpha proteins	Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	Isoleucyl-tRNA synthetase (IleRS)	(Thermus thermophilus HB8 ) [TaxId: 300852 ],	SCOPe (2.08)
A	d1ilea2	All beta proteins	ValRS/IleRS/LeuRS editing domain	ValRS/IleRS/LeuRS editing domain	ValRS/IleRS/LeuRS editing domain	Isoleucyl-tRNA synthetase (IleRS)	(Thermus thermophilus HB8 ) [TaxId: 300852 ],	SCOPe (2.08)
A	d1ilea3	Alpha and beta proteins (a/b)	Adenine nucleotide alpha hydrolase-like	Nucleotidylyl transferase	Class I aminoacyl-tRNA synthetases (RS), catalytic domain	Isoleucyl-tRNA synthetase (IleRS)	(Thermus thermophilus HB8 ) [TaxId: 300852 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	8024765	4000856	SCOP2 (2022-06-29)
A	SCOP2 Family	Class I aminoacyl-tRNA synthetases (RS), catalytic domain	8031825	4003807	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	8037144	3001786	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Nucleotidylyl transferase	8044203	3001541	SCOP2 (2022-06-29)
A	SCOP2B Superfamily	ValRS/IleRS/LeuRS editing domain	8041728	3001115	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_1_2nd	e1ileA4	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: tRNA-synt_1_2nd	ECOD (1.6)
A	Anticodon_1,tRNA-synt_1_1st	e1ileA5	A: alpha bundles	X: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases (From Topology)	H: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases (From Topology)	T: Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases	F: Anticodon_1,tRNA-synt_1_1st	ECOD (1.6)
A	tRNA-synt_1_1st	e1ileA3	A: a/b three-layered sandwiches	X: HUP domain-like	H: HUP domains (From Topology)	T: HUP domains	F: tRNA-synt_1_1st	ECOD (1.6)
A	ileS_1st	e1ileA2	A: few secondary structure elements	X: Rubredoxin-like	H: Rubredoxin-related	T: Rubredoxin-related	F: ileS_1st	ECOD (1.6)
A	tRNA-synt_1_3rd	e1ileA1	A: few secondary structure elements	X: Rubredoxin-like	H: Rubredoxin-related	T: Rubredoxin-related	F: tRNA-synt_1_3rd	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	3.90.740.10	Alpha Beta	Alpha-Beta Complex	Isoleucyl-tRNA Synthetase	domain 2	CATH (4.3.0)
A	1.10.730.10	Mainly Alpha	Orthogonal Bundle	Isoleucyl-tRNA Synthetase	Domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF08264	Anticodon-binding domain of tRNA ligase (Anticodon_1)	Anticodon-binding domain of tRNA ligase	This domain is found mainly hydrophobic tRNA synthetases. The domain binds to the anticodon of the tRNA ligase.	Domain
A	PF00133	tRNA synthetases class I (I, L, M and V) (tRNA-synt_1)	tRNA synthetases class I (I, L, M and V)	Other tRNA synthetase sub-families are too dissimilar to be included.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	ISOLEUCYL-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 isoleucine-tRNA ligase activity catalytic activity, acting on RNA catalytic activity, acting on a nucleic acid catalytic activity, acting on a tRNA catalytic activity ligase activity hydrolase activity, acting on ester bonds carboxylic ester hydrolase activity aminoacyl-tRNA editing activity hydrolase activity cation binding transition metal ion binding zinc ion binding metal ion binding RNA binding tRNA binding nucleic acid binding	isoleucyl-tRNA aminoacylation amino acid activation tRNA aminoacylation 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 isoleucyl-tRNA aminoacylation amino acid activation tRNA aminoacylation 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	cellular anatomical structure intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002301	Isoleucine-tRNA ligase	Family
A	IPR001412	Aminoacyl-tRNA synthetase, class I, conserved site	Conserved Site
A	IPR014729	Rossmann-like alpha/beta/alpha sandwich fold	Homologous Superfamily
A	IPR002300	Aminoacyl-tRNA synthetase, class Ia	Domain
A	IPR009008	Valyl/Leucyl/Isoleucyl-tRNA synthetase, editing domain	Homologous Superfamily
A	IPR033709	Isoleucyl tRNA synthetase type 2, anticodon-binding domain	Domain
A	IPR009080	Aminoacyl-tRNA synthetase, class Ia, anticodon-binding	Homologous Superfamily
A	IPR013155	Methionyl/Valyl/Leucyl/Isoleucyl-tRNA synthetase, anticodon-binding	Domain
A	IPR023586	Isoleucine-tRNA ligase, type 2	Family

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	isoleucine-tRNA ligase (type 2) M-CSA #309	Isoleucine-tRNA ligase (also known as Isoleucyl-tRNA synthetase) is an alpha monomer that belongs to class Ia tRNA synthetases. It activates not only the cognate substrate L-isoleucine but also the structurally similar L-valine in the first, amino-acylation step. In a second, \"editing\" step, the synthetase itself rapidly hydrolyses only the valylated products. For this two-step substrate selection, a \"double-sieve\" mechanism has been proposed to explain the high substrate fidelity and low copy error of the tRNA synthetase. Escherichia coli isoleucyl-tRNA synthetasehas been shown to contain two enzyme-bound zinc atoms per polypeptide chain. The N-terminal zinc ion may play a structural role. Although the two zinc domains are always conserved, the zinc ligands are not, so that there can be both zinc atoms, no zinc atoms or only one of the two. The C-terminal zinc ion is essential (for function in vivo). It plays an important roles in aminoacylation of tRNA(Ile) [PMID:7488160, PMID:8672449].	Defined by 7 residues: PRO:A-46ASP:A-85TRP:A-518GLN:A-554TRP:A-558LYS:A-591LYS:A-594 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 6.1.1.5 (UniProt) Search M-CSA Motif + EC 6.1.1.5

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.