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Protein

Lysine--tRNA ligase, heat inducible

Gene

lysU

Organism
Escherichia coli (strain K12)
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

Also can synthesize a number of adenyl dinucleotides (in particular AppppA). These dinucleotides have been proposed to act as modulators of the heat-shock response and stress response.

Miscellaneous

There are two lysyl-tRNA ligases in E.coli: lysS is expressed constitutively, while lysU is heat inducible.

<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

<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

Mg2+Note: Binds 3 Mg2+ ions per subunit. The third one is coordinated by ATP.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Function’ 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 bindingi415Magnesium 11
Metal bindingi422Magnesium 11
Metal bindingi422Magnesium 21

<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

  • lysyl-tRNA aminoacylation Source: EcoCyc
  • tRNA aminoacylation for protein translation Source: EcoliWiki

<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 processProtein biosynthesis
LigandATP-binding, Magnesium, Metal-binding, Nucleotide-binding

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...
BioCyci
EcoCyc:LYSU-MONOMER
MetaCyc:LYSU-MONOMER

<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:
Lysine--tRNA ligase, heat inducible (EC:6.1.1.6)
Alternative name(s):
Lysyl-tRNA synthetase
Short name:
LysRS
<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:lysU
Ordered Locus Names:b4129, JW4090
<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>OrganismiEscherichia coli (strain K12)
<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 identifieri83333 [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 lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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
  • UP000000318 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes_manual">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
  • UP000000625 Componenti: Chromosome

Organism-specific databases

Escherichia coli strain K12 genome database

More...
EcoGenei
EG10553 lysU

<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

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 <a href="http://www.uniprot.org/help/ptm_processing_section">PTM / Processing</a> section indicates that the initiator methionine is cleaved from the mature protein.<p><a href='/help/init_met' target='_top'>More...</a></p>Initiator methionineiRemoved1 Publication
<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_00001526272 – 505Lysine--tRNA ligase, heat inducibleAdd BLAST504

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘PTM / Processing’ section specifies the position and type of each modified residue excluding <a href="http://www.uniprot.org/manual/lipid">lipids</a>, <a href="http://www.uniprot.org/manual/carbohyd">glycans</a> and <a href="http://www.uniprot.org/manual/crosslnk">protein cross-links</a>.<p><a href='/help/mod_res' target='_top'>More...</a></p>Modified residuei114N6-acetyllysine1 Publication1
Modified residuei156N6-acetyllysine1 Publication1

Keywords - PTMi

Acetylation

Proteomic databases

PaxDb, a database of protein abundance averages across all three domains of life

More...
PaxDbi
P0A8N5

PRoteomics IDEntifications database

More...
PRIDEi
P0A8N5

PTM databases

iPTMnet integrated resource for PTMs in systems biology context

More...
iPTMneti
P0A8N5

<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

Homodimer.

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGrid)

More...
BioGridi
4262688, 18 interactors

Database of interacting proteins

More...
DIPi
DIP-36212N

Protein interaction database and analysis system

More...
IntActi
P0A8N5, 52 interactors

STRING: functional protein association networks

More...
STRINGi
316385.ECDH10B_4322

<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

1505
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

Protein Model Portal of the PSI-Nature Structural Biology Knowledgebase

More...
ProteinModelPortali
P0A8N5

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

More...
SMRi
P0A8N5

Database of comparative protein structure models

More...
ModBasei
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...
EvolutionaryTracei
P0A8N5

<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

<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

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG4105CRK Bacteria
COG1190 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
HOG000236578

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
P0A8N5

KEGG Orthology (KO)

More...
KOi
K04567

Database for complete collections of gene phylogenies

More...
PhylomeDBi
P0A8N5

Family and domain databases

Conserved Domains Database

More...
CDDi
cd00775 LysRS_core, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_00252 Lys_tRNA_synth_class2, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR004364 aa-tRNA-synt_II
IPR006195 aa-tRNA-synth_II
IPR002313 Lys-tRNA-ligase_II
IPR034762 Lys-tRNA-ligase_II_bac/euk
IPR018149 Lys-tRNA-synth_II_C
IPR012340 NA-bd_OB-fold
IPR004365 NA-bd_OB_tRNA

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00152 tRNA-synt_2, 1 hit
PF01336 tRNA_anti-codon, 1 hit

PIRSF; a whole-protein classification database

More...
PIRSFi
PIRSF039101 LysRS2, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00982 TRNASYNTHLYS

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF50249 SSF50249, 1 hit

TIGRFAMs; a protein family database

More...
TIGRFAMsi
TIGR00499 lysS_bact, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS50862 AA_TRNA_LIGASE_II, 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>.<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.

<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 in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

P0A8N5-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MSEQETRGAN EAIDFNDELR NRREKLAALR QQGVAFPNDF RRDHTSDQLH
60 70 80 90 100
EEFDAKDNQE LESLNIEVSV AGRMMTRRIM GKASFVTLQD VGGRIQLYVA
110 120 130 140 150
RDSLPEGVYN DQFKKWDLGD IIGARGTLFK TQTGELSIHC TELRLLTKAL
160 170 180 190 200
RPLPDKFHGL QDQEVRYRQR YLDLIANDKS RQTFVVRSKI LAAIRQFMVA
210 220 230 240 250
RGFMEVETPM MQVIPGGASA RPFITHHNAL DLDMYLRIAP ELYLKRLVVG
260 270 280 290 300
GFERVFEINR NFRNEGISVR HNPEFTMMEL YMAYADYHDL IELTESLFRT
310 320 330 340 350
LAQEVLGTTK VTYGEHVFDF GKPFEKLTMR EAIKKYRPET DMADLDNFDA
360 370 380 390 400
AKALAESIGI TVEKSWGLGR IVTEIFDEVA EAHLIQPTFI TEYPAEVSPL
410 420 430 440 450
ARRNDVNPEI TDRFEFFIGG REIGNGFSEL NDAEDQAERF QEQVNAKAAG
460 470 480 490 500
DDEAMFYDED YVTALEYGLP PTAGLGIGID RMIMLFTNSH TIRDVILFPA

MRPQK
Length:505
Mass (Da):57,827
Last modified:January 23, 2007 - v2
<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:i547415F5875396E0
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 conflicti125Missing in AAA24096 (PubMed:2188953).Curated1
Sequence conflicti236L → A in AAA24096 (PubMed:2188953).Curated1
Sequence conflicti258 – 262INRNF → HVT in AAA24096 (PubMed:2188953).Curated5
Sequence conflicti268 – 269SV → R in AAA24096 (PubMed:2188953).Curated2
Sequence conflicti351A → R in AAA24096 (PubMed:2188953).Curated1
Sequence conflicti371I → S in AAA24096 (PubMed:2188953).Curated1
Sequence conflicti380 – 384AEAHL → VEGHV in AAA24096 (PubMed:2188953).Curated5
Sequence conflicti388T → S in AAA24096 (PubMed:2188953).Curated1

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
X16542 Genomic DNA Translation: CAA34542.1
M30630 Genomic DNA Translation: AAA24096.1
U14003 Genomic DNA Translation: AAA97029.1
U00096 Genomic DNA Translation: AAC77090.1
AP009048 Genomic DNA Translation: BAE78132.1

Protein sequence database of the Protein Information Resource

More...
PIRi
S56358 SYECKU

NCBI Reference Sequences

More...
RefSeqi
NP_418553.1, NC_000913.3
WP_001295074.1, NZ_LN832404.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
AAC77090; AAC77090; b4129
BAE78132; BAE78132; BAE78132

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
948645

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ecj:JW4090
eco:b4129

Pathosystems Resource Integration Center (PATRIC)

More...
PATRICi
fig|1411691.4.peg.2570

<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
X16542 Genomic DNA Translation: CAA34542.1
M30630 Genomic DNA Translation: AAA24096.1
U14003 Genomic DNA Translation: AAA97029.1
U00096 Genomic DNA Translation: AAC77090.1
AP009048 Genomic DNA Translation: BAE78132.1
PIRiS56358 SYECKU
RefSeqiNP_418553.1, NC_000913.3
WP_001295074.1, NZ_LN832404.1

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
1E1OX-ray2.12A2-505[»]
1E1TX-ray2.40A2-505[»]
1E22X-ray2.43A2-505[»]
1E24X-ray2.35A2-505[»]
1LYLX-ray2.80A/B/C2-505[»]
ProteinModelPortaliP0A8N5
SMRiP0A8N5
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi4262688, 18 interactors
DIPiDIP-36212N
IntActiP0A8N5, 52 interactors
STRINGi316385.ECDH10B_4322

PTM databases

iPTMnetiP0A8N5

Proteomic databases

PaxDbiP0A8N5
PRIDEiP0A8N5

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiAAC77090; AAC77090; b4129
BAE78132; BAE78132; BAE78132
GeneIDi948645
KEGGiecj:JW4090
eco:b4129
PATRICifig|1411691.4.peg.2570

Organism-specific databases

EchoBASE - an integrated post-genomic database for E. coli

More...
EchoBASEi
EB0548
EcoGeneiEG10553 lysU

Phylogenomic databases

eggNOGiENOG4105CRK Bacteria
COG1190 LUCA
HOGENOMiHOG000236578
InParanoidiP0A8N5
KOiK04567
PhylomeDBiP0A8N5

Enzyme and pathway databases

BioCyciEcoCyc:LYSU-MONOMER
MetaCyc:LYSU-MONOMER

Miscellaneous databases

EvolutionaryTraceiP0A8N5

Protein Ontology

More...
PROi
PR:P0A8N5

Family and domain databases

CDDicd00775 LysRS_core, 1 hit
HAMAPiMF_00252 Lys_tRNA_synth_class2, 1 hit
InterProiView protein in InterPro
IPR004364 aa-tRNA-synt_II
IPR006195 aa-tRNA-synth_II
IPR002313 Lys-tRNA-ligase_II
IPR034762 Lys-tRNA-ligase_II_bac/euk
IPR018149 Lys-tRNA-synth_II_C
IPR012340 NA-bd_OB-fold
IPR004365 NA-bd_OB_tRNA
PfamiView protein in Pfam
PF00152 tRNA-synt_2, 1 hit
PF01336 tRNA_anti-codon, 1 hit
PIRSFiPIRSF039101 LysRS2, 1 hit
PRINTSiPR00982 TRNASYNTHLYS
SUPFAMiSSF50249 SSF50249, 1 hit
TIGRFAMsiTIGR00499 lysS_bact, 1 hit
PROSITEiView protein in PROSITE
PS50862 AA_TRNA_LIGASE_II, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
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 nameiSYK2_ECOLI
<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: P0A8N5
Secondary accession number(s): P14825, Q2M6H4
<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: June 7, 2005
Last sequence update: January 23, 2007
Last modified: December 5, 2018
This is version 126 of the entry and version 2 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, Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families
  3. Aminoacyl-tRNA synthetases
    List of aminoacyl-tRNA synthetase entries
  4. Escherichia coli
    Escherichia coli (strain K12): entries and cross-references to EcoGene
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