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UniProtKB - Q8NW68 (SYT_STAAW)

Entry version 122 (22 Apr 2020)
Sequence version 1 (01 Oct 2002)
Previous versions | rss
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Protein

Threonine--tRNA ligase

Gene

thrS

Organism
Staphylococcus aureus (strain MW2)
Status
Reviewed-Annotation score:

Annotation score:5 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 protein 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 attachment of threonine to tRNA(Thr) in a two-step reaction: L-threonine is first activated by ATP to form Thr-AMP and then transferred to the acceptor end of tRNA(Thr). Also edits incorrectly charged L-seryl-tRNA(Thr).UniRule annotation

<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+UniRule annotation1 PublicationNote: Binds 1 zinc ion per subunit.UniRule annotation1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section indicates at which position the protein binds a given metal ion. The nature of the metal is indicated in the 'Description' field.<p><a href='/help/metal' target='_top'>More...</a></p>Metal bindingi336ZincUniRule annotation1 Publication1
<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 sitei365ATP1 Publication1
Binding sitei365L-threonine1 Publication1
Metal bindingi387Zinc; via tele nitrogenUniRule annotation1 Publication1
Binding sitei468L-threonine1 Publication1
Binding sitei471ATP1 Publication1
Metal bindingi517Zinc; via pros nitrogenUniRule annotation1 Publication1
Binding sitei522ATP1 Publication1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.<p><a href='/help/np_bind' target='_top'>More...</a></p>Nucleotide bindingi377 – 378ATP1 Publication2
Nucleotide bindingi485 – 486ATP1 Publication2

<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

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<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, Metal-binding, Nucleotide-binding, Zinc

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...BioCyci		SAUR196620:G1G3G-1782-MONOMER

BRENDA Comprehensive Enzyme Information System

More...BRENDAi		6.1.1.3, 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:
Threonine--tRNA ligaseUniRule annotation (EC:6.1.1.3UniRule annotation)
Alternative name(s):
Threonyl-tRNA synthetaseUniRule annotation
Short name:
ThrRSUniRule annotation
<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:thrSUniRule annotation
Ordered Locus Names:MW1626
<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 (strain MW2)
<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 identifieri196620 [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 lineageiBacteria › Firmicutes › Bacilli › Bacillales › Staphylococcaceae › Staphylococcus ›
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000000418 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome

<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

GO - Cellular componenti

Complete GO annotation on QuickGO ...

Keywords - Cellular componenti

Cytoplasm

<p>This section provides information on the disease(s) and phenotype(s) associated with a protein.<p><a href='/help/pathology_and_biotech_section' target='_top'>More...</a></p>Pathology & Biotechi

Chemistry databases

Drug and drug target database

More...DrugBanki		DB03355, 5'-O-(L-Threonylsulfamoyl)adenosine

<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_00001010521 – 645Threonine--tRNA ligaseAdd BLAST645

Proteomic databases

PRoteomics IDEntifications database

More...PRIDEi		Q8NW68

<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

Homodimer.

UniRule annotation1 Publication

<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

Secondary structure

1645
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

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

More...SMRi		Q8NW68

Database of comparative protein structure models

More...ModBasei		Search...

Protein Data Bank in Europe - Knowledge Base

More...PDBe-KBi		Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...EvolutionaryTracei		Q8NW68

<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%5Fand%5Fdomains%5Fsection">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 – 63TGSPROSITE-ProRule annotationAdd BLAST63

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni1 – 62N1 domain1 PublicationAdd BLAST62
Regioni63 – 223N2 domain1 PublicationAdd BLAST161
Regioni242 – 540Catalytic1 PublicationAdd BLAST299
Regioni541 – 645Anticodon recognition1 PublicationAdd BLAST105

<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

The protein structure shows 2 N-terminal domains, the central catalytic and C-terminal anticodon recognition domain. Comparison with the E.coli structure shows the N-terminal domains (editing region) are quite flexible with respect to the catalytic domain. The C-terminal domain recognizes the anticodon region of the tRNA while the acceptor arm is sandwiched between the N-terminal domains and the catalytic domain (PubMed:12875846).1 Publication

<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

Belongs to the class-II aminoacyl-tRNA synthetase family.UniRule annotation

Phylogenomic databases

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...HOGENOMi		CLU_008554_0_1_9

KEGG Orthology (KO)

More...KOi		K01868

Identification of Orthologs from Complete Genome Data

More...OMAi		FYYDFAY

Family and domain databases

Conserved Domains Database

More...CDDi		cd00771, ThrRS_core, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...Gene3Di		3.10.20.30, 1 hit
3.40.50.800, 1 hit

HAMAP database of protein families

More...HAMAPi		MF_00184, Thr_tRNA_synth, 1 hit

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR002314, aa-tRNA-synt_IIb
IPR006195, aa-tRNA-synth_II
IPR004154, Anticodon-bd
IPR036621, Anticodon-bd_dom_sf
IPR012675, Beta-grasp_dom_sf
IPR004095, TGS
IPR012676, TGS-like
IPR002320, Thr-tRNA-ligase_IIa
IPR018163, Thr/Ala-tRNA-synth_IIc_edit
IPR033728, ThrRS_core
IPR012947, tRNA_SAD

The PANTHER Classification System

More...PANTHERi		PTHR11451, PTHR11451, 1 hit

Pfam protein domain database

More...Pfami		View protein in Pfam
PF03129, HGTP_anticodon, 1 hit
PF02824, TGS, 1 hit
PF00587, tRNA-synt_2b, 1 hit
PF07973, tRNA_SAD, 1 hit

Protein Motif fingerprint database; a protein domain database

More...PRINTSi		PR01047, TRNASYNTHTHR

Simple Modular Architecture Research Tool; a protein domain database

More...SMARTi		View protein in SMART
SM00863, tRNA_SAD, 1 hit

Superfamily database of structural and functional annotation

More...SUPFAMi		SSF55186, SSF55186, 1 hit
SSF81271, SSF81271, 1 hit

TIGRFAMs; a protein family database

More...TIGRFAMsi		TIGR00418, thrS, 1 hit

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS50862, AA_TRNA_LIGASE_II, 1 hit
PS51880, TGS, 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.

Q8NW68-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MEQINIQFPD GNKKAFDKGT TTEDIAQSIS PGLRKKAVAG KFNGQLVDLT 
        60         70         80         90        100
KPLETDGSIE IVTPGSEEAL EVLRHSTAHL MAHAIKRLYG NVKFGVGPVI 
       110        120        130        140        150
EGGFYYDFDI DQNISSDDFE QIEKTMKQIV NENMKIERKV VSRDEAKELF 
       160        170        180        190        200
SNDEYKLELI DAIPEDENVT LYSQGDFTDL CRGVHVPSTA KIKEFKLLST 
       210        220        230        240        250
AGAYWRGDSN NKMLQRIYGT AFFDKKELKA HLQMLEERKE RDHRKIGKEL 
       260        270        280        290        300
ELFTNSQLVG AGLPLWLPNG ATIRREIERY IVDKEVSMGY DHVYTPVLAN 
       310        320        330        340        350
VDLYKTSGHW DHYQEDMFPP MQLDETESMV LRPMNCPHHM MIYANKPHSY 
       360        370        380        390        400
RELPIRIAEL GTMHRYEASG AVSGLQRVRG MTLNDSHIFV RPDQIKEEFK 
       410        420        430        440        450
RVVNMIIDVY KDFGFEDYSF RLSYRDPEDK EKYFDDDDMW NKAENMLKEA 
       460        470        480        490        500
ADELGLSYEE AIGEAAFYGP KLDVQVKTAM GKEETLSTAQ LDFLLPERFD 
       510        520        530        540        550
LTYIGQDGEH HRPVVIHRGV VSTMERFVAF LTEETKGAFP TWLAPKQVQI 
       560        570        580        590        600
IPVNVDLHYD YARQLQDELK SQGVRVSIDD RNEKMGYKIR EAQMQKIPYQ 
       610        620        630        640 
IVVGDKEVEN NQVNVRQYGS QDQETVEKDE FIWNLVDEIR LKKHR
Length:645
Mass (Da):74,460
Last modified:October 1, 2002 - 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:i18FF7CFC22892FBA
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
BA000033 Genomic DNA Translation: BAB95491.1

NCBI Reference Sequences

More...RefSeqi		WP_000435132.1, NC_003923.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...EnsemblBacteriai		BAB95491; BAB95491; BAB95491

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...KEGGi		sam:MW1626

<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
BA000033 Genomic DNA Translation: BAB95491.1
RefSeqiWP_000435132.1, NC_003923.1

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...PDBei

Protein Data Bank RCSB

More...RCSB PDBi

Protein Data Bank Japan

More...PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1NYQX-ray3.20A/B1-645[»]
1NYRX-ray2.80A/B1-645[»]
SMRiQ8NW68
ModBaseiSearch...
PDBe-KBiSearch...

Chemistry databases

DrugBankiDB03355, 5'-O-(L-Threonylsulfamoyl)adenosine

Proteomic databases

PRIDEiQ8NW68

Genome annotation databases

EnsemblBacteriaiBAB95491; BAB95491; BAB95491
KEGGisam:MW1626

Phylogenomic databases

HOGENOMiCLU_008554_0_1_9
KOiK01868
OMAiFYYDFAY

Enzyme and pathway databases

BioCyciSAUR196620:G1G3G-1782-MONOMER
BRENDAi6.1.1.3, 3352

Miscellaneous databases

EvolutionaryTraceiQ8NW68

Family and domain databases

CDDicd00771, ThrRS_core, 1 hit
Gene3Di3.10.20.30, 1 hit
3.40.50.800, 1 hit
HAMAPiMF_00184, Thr_tRNA_synth, 1 hit
InterProiView protein in InterPro
IPR002314, aa-tRNA-synt_IIb
IPR006195, aa-tRNA-synth_II
IPR004154, Anticodon-bd
IPR036621, Anticodon-bd_dom_sf
IPR012675, Beta-grasp_dom_sf
IPR004095, TGS
IPR012676, TGS-like
IPR002320, Thr-tRNA-ligase_IIa
IPR018163, Thr/Ala-tRNA-synth_IIc_edit
IPR033728, ThrRS_core
IPR012947, tRNA_SAD
PANTHERiPTHR11451, PTHR11451, 1 hit
PfamiView protein in Pfam
PF03129, HGTP_anticodon, 1 hit
PF02824, TGS, 1 hit
PF00587, tRNA-synt_2b, 1 hit
PF07973, tRNA_SAD, 1 hit
PRINTSiPR01047, TRNASYNTHTHR
SMARTiView protein in SMART
SM00863, tRNA_SAD, 1 hit
SUPFAMiSSF55186, SSF55186, 1 hit
SSF81271, SSF81271, 1 hit
TIGRFAMsiTIGR00418, thrS, 1 hit
PROSITEiView protein in PROSITE
PS50862, AA_TRNA_LIGASE_II, 1 hit
PS51880, TGS, 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 nameiSYT_STAAW
<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: Q8NW68
<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: October 31, 2003
Last sequence update: October 1, 2002
Last modified: April 22, 2020
This is version 122 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

3D-structure

Documents

  1. Aminoacyl-tRNA synthetases
    List of aminoacyl-tRNA synthetase entries
  2. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  3. SIMILARITY comments
    Index of protein domains and families
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