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Entry version 121 (02 Jun 2021)
Sequence version 1 (01 Nov 1995)
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Protein

Isoleucine--tRNA ligase

Gene

ileS

Organism
Staphylococcus aureus
Status
Reviewed-Annotation score:

Annotation score:4 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
-Protein inferred from homologyi <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Catalyzes the attachment of isoleucine to tRNA(Ile). As IleRS can inadvertently accommodate and process structurally similar amino acids such as valine, to avoid such errors it has two additional distinct tRNA(Ile)-dependent editing activities. One activity is designated as 'pretransfer' editing and involves the hydrolysis of activated Val-AMP. The other activity is designated 'posttransfer' editing and involves deacylation of mischarged Val-tRNA(Ile) (By similarity).

By similarity

Confers high-level resistance to the antibiotic mupirocin (pseudomonic acid A), an Ile-analog that competitively inhibits activation by Ile-tRNA synthetase, thus inhibiting protein biosynthesis.

2 Publications

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

<p>This subsection of the 'Function' section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

Zn2+By similarity

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei588ATPBy similarity1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

GO - Biological processi

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionAminoacyl-tRNA synthetase, Ligase
Biological processAntibiotic resistance, Protein biosynthesis
LigandATP-binding, Metal-binding, Nucleotide-binding, Zinc

Enzyme and pathway databases

BRENDA Comprehensive Enzyme Information System

More...
BRENDAi
6.1.1.5, 3352

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Isoleucine--tRNA ligase (EC:6.1.1.5)
Alternative name(s):
Isoleucyl-tRNA synthetase
Short name:
IleRS
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:ileS
Synonyms:mupR
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates if the gene coding for the protein originates from the hydrogenosome, the mitochondrion, the nucleomorph, different plastids or a plasmid. The absence of this section means that the gene is located in one of the main chromosomal element(s).<p><a href='/help/encoded_on' target='_top'>More...</a></p>Encoded oniPlasmid pOX3011 Publication
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiStaphylococcus aureus
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri1280 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiBacteriaFirmicutesBacilliBacillalesStaphylococcaceaeStaphylococcus

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Keywords - Cellular componenti

Cytoplasm

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00000985621 – 1024Isoleucine--tRNA ligaseAdd BLAST1024

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
P41368

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Monomer.

By similarity

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...
SMRi
P41368

Database of comparative protein structure models

More...
ModBasei
Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Motif

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes a short (usually not more than 20 amino acids) conserved sequence motif of biological significance.<p><a href='/help/motif' target='_top'>More...</a></p>Motifi42 – 52'HIGH' regionAdd BLAST11
Motifi585 – 589'KMSKS' region5

<p>This subsection of the 'Family and domains' section provides general information on the biological role of a domain. The term 'domain' is intended here in its wide acceptation, it may be a structural domain, a transmembrane region or a functional domain. Several domains are described in this subsection.<p><a href='/help/domain_cc' target='_top'>More...</a></p>Domaini

IleRS has two distinct active sites: one for aminoacylation and one for editing. The misactivated valine is translocated from the active site to the editing site, which sterically excludes the correctly activated isoleucine. The single editing site contains two valyl binding pockets, one specific for each substrate (Val-AMP or Val-tRNA(Ile)) (By similarity).By similarity

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Family and domain databases

Conserved Domains Database

More...
CDDi
cd07961, Anticodon_Ia_Ile_ABEc, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
3.40.50.620, 1 hit
3.90.740.10, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_02003, Ile_tRNA_synth_type2, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR001412, aa-tRNA-synth_I_CS
IPR002300, aa-tRNA-synth_Ia
IPR033709, Anticodon_Ile_ABEc
IPR002301, Ile-tRNA-ligase
IPR023586, Ile-tRNA-ligase_type2
IPR013155, M/V/L/I-tRNA-synth_anticd-bd
IPR014729, Rossmann-like_a/b/a_fold
IPR009080, tRNAsynth_Ia_anticodon-bd
IPR009008, Val/Leu/Ile-tRNA-synth_edit

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF08264, Anticodon_1, 1 hit
PF00133, tRNA-synt_1, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00984, TRNASYNTHILE

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF47323, SSF47323, 2 hits
SSF50677, SSF50677, 1 hit

TIGRFAMs; a protein family database

More...
TIGRFAMsi
TIGR00392, ileS, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00178, AA_TRNA_LIGASE_I, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

P41368-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MTKKYLNTQN EISAFWNTQK IFKKSIDNRK GQESFVFYDG PPTANGLPHA
60 70 80 90 100
GHVLGRVIKD LVARLKTMQG FYVERKAGWD THGLPVELEV EKKIGIKGKQ
110 120 130 140 150
DIEKYGIENF INECKKSVFN YEKEWRDFSK DLGYWVDMDS PYITLENNYI
160 170 180 190 200
ESVWNILSTF HKKGLLYKGH KVTPYCTHDQ TALSSHEVAQ GYKNVKDLSA
210 220 230 240 250
VVKFQLTNSK DTYFLSWTTT PWTLPANVAL AINKDLNYSK IRVENEYYIL
260 270 280 290 300
ATDLINSIIT EKYEIIDTFS GSNLINLKYI PPFESDGLVN AYYVVDGEFV
310 320 330 340 350
TNSEGTGIVH IAPAHGEDDY QLVLERDLDF LNVITREGVY NDRFPELVGN
360 370 380 390 400
KAKNSDIEII KLLSKKQLLY KKQKYEHNYP HCWRCGNPLI YYAMEGWFIK
410 420 430 440 450
TTNFKNEIIN NNNNIEWFPS HIKEGRMGNF LENMVDWNIG RNRYWGTPLN
460 470 480 490 500
VWICNDCNHE YAPSSIKDLQ NNSINKIDED IELHRPYVDN ITLSCPKCNG
510 520 530 540 550
KMSRVEEVID VWFDSGSMPF AQHHYPFDNQ KIFNQHFPAD FIAEGVDQTR
560 570 580 590 600
GWFYSLLVIS TILKGKSSYK RALSLGHILD SNGKKMSKSK GNVINPTELI
610 620 630 640 650
NKYGADSLRW ALISDSAPWN NKRFSENIVA QTKSKFIDTL DNIYKFYNMY
660 670 680 690 700
NKIDHYNPNN EITKSRNTLD NWALSRLNTL IKESNIYVNN YDFTSAARLI
710 720 730 740 750
NEYTNTISNW YIGDSRGRFW EQGISNDKKD AYNTLYEILT TLSRLVAPFV
760 770 780 790 800
PFISEKIHYN LTGKSVHLQD YPQYKESFIN QALEDEMHTV IKIVELSRQA
810 820 830 840 850
RKNADLKIKQ PLSKMVIKPN SQLNLSFLPN YYSIIKDELN IKNIELTDNI
860 870 880 890 900
NDYITYELKL NFSSVGPKLG NKTKNIQTLI DSLSEYDKKS LIESNNFKSL
910 920 930 940 950
SSDAELTKDD FIIKTLPKDS YQLSEDNDCV ILLDKNLSPE LIREGHAREL
960 970 980 990 1000
IRLIQQLRKK KNLPINQRID IYIGVTGELL ESIKTNKNMF KENFVIKNIH
1010 1020
LNVIDEYENT IHFNNKEIKI SLLY
Length:1,024
Mass (Da):118,876
Last modified:November 1, 1995 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i56ECD232CA0C8430
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti519P → R in CAA42079 (PubMed:1903747).Curated1
Sequence conflicti591 – 593GNV → ETF in CAA42080 (PubMed:1903747).Curated3

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

More...
GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
X75439 Genomic DNA Translation: CAA53189.1
X59478 Genomic DNA Translation: CAA42080.1
X59477 Genomic DNA Translation: CAA42079.1

NCBI Reference Sequences

More...
RefSeqi
WP_012263521.1, NG_056478.1
YP_001653102.1, NC_010279.1

Genome annotation databases

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
59696112

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X75439 Genomic DNA Translation: CAA53189.1
X59478 Genomic DNA Translation: CAA42080.1
X59477 Genomic DNA Translation: CAA42079.1
RefSeqiWP_012263521.1, NG_056478.1
YP_001653102.1, NC_010279.1

3D structure databases

SMRiP41368
ModBaseiSearch...

Proteomic databases

PRIDEiP41368

Genome annotation databases

GeneIDi59696112

Enzyme and pathway databases

BRENDAi6.1.1.5, 3352

Family and domain databases

CDDicd07961, Anticodon_Ia_Ile_ABEc, 1 hit
Gene3Di3.40.50.620, 1 hit
3.90.740.10, 1 hit
HAMAPiMF_02003, Ile_tRNA_synth_type2, 1 hit
InterProiView protein in InterPro
IPR001412, aa-tRNA-synth_I_CS
IPR002300, aa-tRNA-synth_Ia
IPR033709, Anticodon_Ile_ABEc
IPR002301, Ile-tRNA-ligase
IPR023586, Ile-tRNA-ligase_type2
IPR013155, M/V/L/I-tRNA-synth_anticd-bd
IPR014729, Rossmann-like_a/b/a_fold
IPR009080, tRNAsynth_Ia_anticodon-bd
IPR009008, Val/Leu/Ile-tRNA-synth_edit
PfamiView protein in Pfam
PF08264, Anticodon_1, 1 hit
PF00133, tRNA-synt_1, 1 hit
PRINTSiPR00984, TRNASYNTHILE
SUPFAMiSSF47323, SSF47323, 2 hits
SSF50677, SSF50677, 1 hit
TIGRFAMsiTIGR00392, ileS, 1 hit
PROSITEiView protein in PROSITE
PS00178, AA_TRNA_LIGASE_I, 1 hit

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiSYI2_STAAU
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: P41368
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: November 1, 1995
Last sequence update: November 1, 1995
Last modified: June 2, 2021
This is version 121 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

Plasmid

Documents

  1. Aminoacyl-tRNA synthetases
    List of aminoacyl-tRNA synthetase entries
  2. SIMILARITY comments
    Index of protein domains and families
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