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Entry version 93 (13 Nov 2019)
Sequence version 1 (05 Jul 2004)
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Protein

Methionine--tRNA ligase, cytoplasmic

Gene

mars

Organism
Xenopus laevis (African clawed frog)
Status
Reviewed-Annotation score:

Annotation score:3 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>
-Experimental evidence at transcript leveli <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 specific attachment of an amino acid to its cognate tRNA in a 2 step reaction: the amino acid (AA) is first activated by ATP to form AA-AMP and then transferred to the acceptor end of the tRNA. Plays a role in the synthesis of ribosomal RNA in the nucleolus.By similarity

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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 sitei594ATPBy 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, RNA-binding, tRNA-binding
Biological processProtein biosynthesis
LigandATP-binding, Nucleotide-binding

<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_and_taxonomy_section">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:
Methionine--tRNA ligase, cytoplasmic (EC:6.1.1.10By similarity)
Alternative name(s):
Methionyl-tRNA synthetase
Short name:
MetRS
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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:mars
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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>OrganismiXenopus laevis (African clawed frog)
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 identifieri8355 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiAmphibiaBatrachiaAnuraPipoideaPipidaeXenopodinaeXenopusXenopus

Organism-specific databases

Xenopus laevis and tropicalis biology and genomics resource

More...
Xenbasei
XB-GENE-17340220 mars1

<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

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte & Seán O’Donoghue; Source: COMPARTMENTS

Keywords - Cellular componenti

Cytoplasm, Nucleus

<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.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00001392641 – 905Methionine--tRNA ligase, cytoplasmicAdd BLAST905

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
Q6PF21

<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_section">'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_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Monomer.

Part of a multisubunit complex that groups tRNA ligases for Arg (RARS), Asp (DARS), Gln (QARS), Ile (IARS), Leu (LARS), Lys (KARS1), Met (MARS) the bifunctional ligase for Glu and Pro (EPRS) and the auxiliary subunits AIMP1/p43, AIMP2/p38 and EEF1E1/p18.

By similarity

Protein-protein interaction databases

Protein interaction database and analysis system

More...
IntActi
Q6PF21, 1 interactor

<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
Q6PF21

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

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family_and_domains_section">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini1 – 75GST N-terminalAdd BLAST75
Domaini72 – 199GST C-terminalAdd BLAST128
Domaini844 – 900WHEP-TRSAdd BLAST57

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>Motifi271 – 281'HIGH' regionAdd BLAST11
Motifi591 – 595'KMSKS' region5

<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

Phylogenomic databases

KEGG Orthology (KO)

More...
KOi
K01874

Database of Orthologous Groups

More...
OrthoDBi
333013at2759

Family and domain databases

Conserved Domains Database

More...
CDDi
cd07957 Anticodon_Ia_Met, 1 hit
cd00814 MetRS_core, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
2.20.28.20, 1 hit
3.40.30.10, 1 hit
3.40.50.620, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_00098 Met_tRNA_synth_type1, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR001412 aa-tRNA-synth_I_CS
IPR041872 Anticodon_Met
IPR010987 Glutathione-S-Trfase_C-like
IPR036282 Glutathione-S-Trfase_C_sf
IPR004045 Glutathione_S-Trfase_N
IPR004046 GST_C
IPR041598 MARS_N
IPR023458 Met-tRNA_ligase_1
IPR014758 Met-tRNA_synth
IPR015413 Methionyl/Leucyl_tRNA_Synth
IPR033911 MetRS_core
IPR029038 MetRS_Zn
IPR014729 Rossmann-like_a/b/a_fold
IPR009068 S15_NS1_RNA-bd
IPR036249 Thioredoxin-like_sf
IPR009080 tRNAsynth_Ia_anticodon-bd
IPR000738 WHEP-TRS_dom

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF14497 GST_C_3, 1 hit
PF18485 GST_N_5, 1 hit
PF09334 tRNA-synt_1g, 1 hit
PF00458 WHEP-TRS, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR01041 TRNASYNTHMET

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00991 WHEP-TRS, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF47060 SSF47060, 1 hit
SSF47323 SSF47323, 1 hit
SSF47616 SSF47616, 1 hit
SSF57770 SSF57770, 1 hit

TIGRFAMs; a protein family database

More...
TIGRFAMsi
TIGR00398 metG, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00178 AA_TRNA_LIGASE_I, 1 hit
PS50405 GST_CTER, 1 hit
PS50404 GST_NTER, 1 hit
PS00762 WHEP_TRS_1, 1 hit
PS51185 WHEP_TRS_2, 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_length">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_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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.

Q6PF21-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MKLFVGEGNP QGVKVLAAAA LWAQHVQIDR LQQEEKIVPF MSQPRLPVLD
60 70 80 90 100
LENGNYLFLS NAICRYFYLS SGHDMCDLSN QWLEWEAAEL QPALSAALYA
110 120 130 140 150
HVVQGKKKED VMATISASLK HLDQSLAGKS SPYLIKDALT VVDIVVWGSI
160 170 180 190 200
YPLIVDASNL PEEMASLKRW FQNVSQLEQC QKAASSLLKD KGSSVFKPFL
210 220 230 240 250
QKQPAPITPP GKSVCKEQEG EDMPSLSEED IQAAAEAWAK GLTGASKPKQ
260 270 280 290 300
RPHPILPVEG EKNVLITSAL PYVNNVPHLG NIIGSVLSAD VFARYCRLRN
310 320 330 340 350
WNTLYICGTD EYGTATETKA MEEGLTPQQI CDKYNAIHTA IYQWFNISFD
360 370 380 390 400
YFGRTTTQHQ TTISQDIFHR LLEREFLLTD TVEQLRCEKC QRFLADRFVE
410 420 430 440 450
GICPFCNYEE ARGDQCDKCG KLINAVELKK PQCKICKQSP VIKSSKHLFL
460 470 480 490 500
DLPKLEKRLE QWLEQSFSTG DWTSNARFIT RSWIRDGLKP RCITRDLKWG
510 520 530 540 550
TPVPLDGFRD KVFYVWFDAP IGYISITANY TDQWEKWWKS PQQVQLYNFM
560 570 580 590 600
AKDNVPFHSV VFPSCLLGAE DNYTLVNHLV ATEYLNYEDG KFSKSRGVGV
610 620 630 640 650
FGDMAKDTGI PADIWRFYLL YVRPEGQDSA FSWSDLMLKN NSELLNNLGN
660 670 680 690 700
FVNRAGMFVQ KFFNGCVPEM ELLSEDKRLL AQVAAELQQY NLLLEKVRIR
710 720 730 740 750
DALRCILNIS RHGNQYIQVN EPWKCIKGNQ QEQKRAGTVT GVAVNMAALL
760 770 780 790 800
SIMLHPYMPT ISSVIQEQLL MPQESKVLTT DFCCCLQSGH QIGNVSPLFQ
810 820 830 840 850
KLENDQIESL RKRFGGGQVK TESKVSPSQE APEQQAPKAS GPERVKELMQ
860 870 880 890 900
ELEKQGNHVR ELKGKKAEKS VIDPEVQKLL ALKKELALAE GKSPDPPTQK

GKKKK
Length:905
Mass (Da):102,359
Last modified:July 5, 2004 - 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:iC79BFA3254468964
GO

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
BC057757 mRNA Translation: AAH57757.1

NCBI Reference Sequences

More...
RefSeqi
NP_001079984.1, NM_001086515.1

Genome annotation databases

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
379675

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
xla:379675

<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
BC057757 mRNA Translation: AAH57757.1
RefSeqiNP_001079984.1, NM_001086515.1

3D structure databases

SMRiQ6PF21
ModBaseiSearch...

Protein-protein interaction databases

IntActiQ6PF21, 1 interactor

Proteomic databases

PRIDEiQ6PF21

Genome annotation databases

GeneIDi379675
KEGGixla:379675

Organism-specific databases

Comparative Toxicogenomics Database

More...
CTDi
216443
XenbaseiXB-GENE-17340220 mars1

Phylogenomic databases

KOiK01874
OrthoDBi333013at2759

Family and domain databases

CDDicd07957 Anticodon_Ia_Met, 1 hit
cd00814 MetRS_core, 1 hit
Gene3Di2.20.28.20, 1 hit
3.40.30.10, 1 hit
3.40.50.620, 1 hit
HAMAPiMF_00098 Met_tRNA_synth_type1, 1 hit
InterProiView protein in InterPro
IPR001412 aa-tRNA-synth_I_CS
IPR041872 Anticodon_Met
IPR010987 Glutathione-S-Trfase_C-like
IPR036282 Glutathione-S-Trfase_C_sf
IPR004045 Glutathione_S-Trfase_N
IPR004046 GST_C
IPR041598 MARS_N
IPR023458 Met-tRNA_ligase_1
IPR014758 Met-tRNA_synth
IPR015413 Methionyl/Leucyl_tRNA_Synth
IPR033911 MetRS_core
IPR029038 MetRS_Zn
IPR014729 Rossmann-like_a/b/a_fold
IPR009068 S15_NS1_RNA-bd
IPR036249 Thioredoxin-like_sf
IPR009080 tRNAsynth_Ia_anticodon-bd
IPR000738 WHEP-TRS_dom
PfamiView protein in Pfam
PF14497 GST_C_3, 1 hit
PF18485 GST_N_5, 1 hit
PF09334 tRNA-synt_1g, 1 hit
PF00458 WHEP-TRS, 1 hit
PRINTSiPR01041 TRNASYNTHMET
SMARTiView protein in SMART
SM00991 WHEP-TRS, 1 hit
SUPFAMiSSF47060 SSF47060, 1 hit
SSF47323 SSF47323, 1 hit
SSF47616 SSF47616, 1 hit
SSF57770 SSF57770, 1 hit
TIGRFAMsiTIGR00398 metG, 1 hit
PROSITEiView protein in PROSITE
PS00178 AA_TRNA_LIGASE_I, 1 hit
PS50405 GST_CTER, 1 hit
PS50404 GST_NTER, 1 hit
PS00762 WHEP_TRS_1, 1 hit
PS51185 WHEP_TRS_2, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
Search...

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 nameiSYMC_XENLA
<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: Q6PF21
<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_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: September 13, 2005
Last sequence update: July 5, 2004
Last modified: November 13, 2019
This is version 93 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 programChordata 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

Documents

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