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UniProtKB - P23882 (FMT_ECOLI)

Entry version 184 (02 Jun 2021)
Sequence version 4 (23 Jan 2007)
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Protein

Methionyl-tRNA formyltransferase

Gene

fmt

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

Attaches a formyl group to the free amino group of methionyl-tRNA(fMet). The formyl group appears to play a dual role in the initiator identity of N-formylmethionyl-tRNA by promoting its recognition by IF2 and preventing the misappropriation of this tRNA by the elongation apparatus.

UniRule annotation3 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 <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes regulatory mechanisms for enzymes, transporters or microbial transcription factors, and reports the components which regulate (by activation or inhibition) the reaction.<p><a href='/help/activity_regulation' target='_top'>More...</a></p>Activity regulationi

Activity is optimum in the presence of Mg2+ and K+.1 Publication

<p>This subsection of the 'Function' section describes biophysical and chemical properties, such as maximal absorption, kinetic parameters, pH dependence, redox potentials and temperature dependence.<p><a href='/help/biophysicochemical_properties' target='_top'>More...</a></p>Kineticsi

  1. KM=13.5 µM for 10-formyltetrahydrofolate1 Publication
  2. KM=0.35 µM for L-methionyl-tRNA(fMet)1 Publication

    <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 functionTransferase
    Biological processProtein biosynthesis

    Enzyme and pathway databases

    BioCyc Collection of Pathway/Genome Databases

    More...    BioCyci    		EcoCyc:EG11268-MONOMER
    MetaCyc:EG11268-MONOMER

    BRENDA Comprehensive Enzyme Information System

    More...    BRENDAi    		2.1.2.9, 2026

    <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:
    Methionyl-tRNA formyltransferaseUniRule annotationCurated (EC:2.1.2.9UniRule annotation2 Publications)
    Alternative name(s):
    Met-tRNA(fMet) formyltransferase1 Publication
    <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:fmt1 PublicationUniRule annotation
    Synonyms:yhdD
    Ordered Locus Names:b3288, JW3249
    <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>OrganismiEscherichia coli (strain K12)
    <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 identifieri83333 [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 › Proteobacteria › Gammaproteobacteria › Enterobacterales › Enterobacteriaceae › Escherichia ›
    <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
    • UP000000318 <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
    • UP000000625 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

    <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    		DB04464, N-Formylmethionine

    <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%5Fprocessing%5Fsection">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 methionineiRemoved
    <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_00000829592 – 315Methionyl-tRNA formyltransferaseAdd BLAST314

    Proteomic databases

    jPOST - Japan Proteome Standard Repository/Database

    More...    jPOSTi    		P23882

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

    More...    PaxDbi    		P23882

    PRoteomics IDEntifications database

    More...    PRIDEi    		P23882

    2D gel databases

    Two-dimensional polyacrylamide gel electrophoresis database from the Geneva University Hospital

    More...    SWISS-2DPAGEi    		P23882

    <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.

    1 Publication

    Protein-protein interaction databases

    The Biological General Repository for Interaction Datasets (BioGRID)

    More...    BioGRIDi    		4263429, 45 interactors
    852091, 1 interactor

    Database of interacting proteins

    More...    DIPi    		DIP-9668N

    Protein interaction database and analysis system

    More...    IntActi    		P23882, 12 interactors

    STRING: functional protein association networks

    More...    STRINGi    		511145.b3288

    <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

    1315
    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    		P23882

    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    		P23882

    <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

    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>Regioni2 – 189N-terminal domain2 PublicationsAdd BLAST188
    Regioni113 – 116Tetrahydrofolate (THF) bindingUniRule annotation4
    Regioni210 – 315C-terminal domain2 PublicationsAdd BLAST106

    <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

    Composed of an N- and a C-terminal domain. The N-terminal domain carries the tetrahydrofolate (THF)-binding site and the C-terminal domain is presumably involved in positioning the Met-tRNA substrate for the formylation reaction.2 Publications

    <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 Fmt family.UniRule annotationCurated

    Phylogenomic databases

    evolutionary genealogy of genes: Non-supervised Orthologous Groups

    More...    eggNOGi    		COG0223, Bacteria

    The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

    More...    HOGENOMi    		CLU_033347_1_2_6

    InParanoid: Eukaryotic Ortholog Groups

    More...    InParanoidi    		P23882

    Database for complete collections of gene phylogenies

    More...    PhylomeDBi    		P23882

    Family and domain databases

    Conserved Domains Database

    More...    CDDi    		cd08646, FMT_core_Met-tRNA-FMT_N, 1 hit
    cd08704, Met_tRNA_FMT_C, 1 hit

    Gene3D Structural and Functional Annotation of Protein Families

    More...    Gene3Di    		3.10.25.10, 1 hit

    HAMAP database of protein families

    More...    HAMAPi    		MF_00182, Formyl_trans, 1 hit

    Integrated resource of protein families, domains and functional sites

    More...    InterProi    		View protein in InterPro
    IPR005794, Fmt
    IPR005793, Formyl_trans_C
    IPR037022, Formyl_trans_C_sf
    IPR002376, Formyl_transf_N
    IPR036477, Formyl_transf_N_sf
    IPR011034, Formyl_transferase-like_C_sf
    IPR001555, GART_AS
    IPR044135, Met-tRNA-FMT_C
    IPR041711, Met-tRNA-FMT_N

    Pfam protein domain database

    More...    Pfami    		View protein in Pfam
    PF02911, Formyl_trans_C, 1 hit
    PF00551, Formyl_trans_N, 1 hit

    Superfamily database of structural and functional annotation

    More...    SUPFAMi    		SSF50486, SSF50486, 1 hit
    SSF53328, SSF53328, 1 hit

    TIGRFAMs; a protein family database

    More...    TIGRFAMsi    		TIGR00460, fmt, 1 hit

    PROSITE; a protein domain and family database

    More...    PROSITEi    		View protein in PROSITE
    PS00373, GART, 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.

    <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 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.

    P23882-1 [UniParc]FASTAAdd to basket
    « Hide
            10         20         30         40         50
    MSESLRIIFA GTPDFAARHL DALLSSGHNV VGVFTQPDRP AGRGKKLMPS 
            60         70         80         90        100
    PVKVLAEEKG LPVFQPVSLR PQENQQLVAE LQADVMVVVA YGLILPKAVL 
           110        120        130        140        150
    EMPRLGCINV HGSLLPRWRG AAPIQRSLWA GDAETGVTIM QMDVGLDTGD 
           160        170        180        190        200
    MLYKLSCPIT AEDTSGTLYD KLAELGPQGL ITTLKQLADG TAKPEVQDET 
           210        220        230        240        250
    LVTYAEKLSK EEARIDWSLS AAQLERCIRA FNPWPMSWLE IEGQPVKVWK 
           260        270        280        290        300
    ASVIDTATNA APGTILEANK QGIQVATGDG ILNLLSLQPA GKKAMSAQDL 
           310 
    LNSRREWFVP GNRLV
    Length:315
    Mass (Da):34,168
    Last modified:January 23, 2007 - v4
    <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:i1AE14C808F04A126
    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
    		X63666 Genomic DNA Translation: CAA45207.1
    X77091 Genomic DNA Translation: CAA54368.1
    U18997 Genomic DNA Translation: AAA58085.1
    U00096 Genomic DNA Translation: AAC76313.1
    AP009048 Genomic DNA Translation: BAE78004.1
    X00767 Genomic DNA Translation: CAA25339.1 Sequence problems.
    Y10307 Genomic DNA Translation: CAA71358.1

    Protein sequence database of the Protein Information Resource

    More...    PIRi    		S23108

    NCBI Reference Sequences

    More...    RefSeqi    		NP_417746.1, NC_000913.3
    WP_000004473.1, NZ_SSZK01000040.1

    Genome annotation databases

    Ensembl bacterial and archaeal genome annotation project

    More...    EnsemblBacteriai    		AAC76313; AAC76313; b3288
    BAE78004; BAE78004; BAE78004

    Database of genes from NCBI RefSeq genomes

    More...    GeneIDi    		947779

    KEGG: Kyoto Encyclopedia of Genes and Genomes

    More...    KEGGi    		ecj:JW3249
    eco:b3288

    Pathosystems Resource Integration Center (PATRIC)

    More...    PATRICi    		fig|1411691.4.peg.3444

    <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
    		X63666 Genomic DNA Translation: CAA45207.1
    X77091 Genomic DNA Translation: CAA54368.1
    U18997 Genomic DNA Translation: AAA58085.1
    U00096 Genomic DNA Translation: AAC76313.1
    AP009048 Genomic DNA Translation: BAE78004.1
    X00767 Genomic DNA Translation: CAA25339.1 Sequence problems.
    Y10307 Genomic DNA Translation: CAA71358.1
    PIRiS23108
    RefSeqiNP_417746.1, NC_000913.3
    WP_000004473.1, NZ_SSZK01000040.1

    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
    1FMTX-ray2.00A/B2-315[»]
    2FMTX-ray2.80A/B2-315[»]
    SMRiP23882
    ModBaseiSearch...
    PDBe-KBiSearch...

    Protein-protein interaction databases

    BioGRIDi4263429, 45 interactors
    852091, 1 interactor
    DIPiDIP-9668N
    IntActiP23882, 12 interactors
    STRINGi511145.b3288

    Chemistry databases

    DrugBankiDB04464, N-Formylmethionine

    2D gel databases

    SWISS-2DPAGEiP23882

    Proteomic databases

    jPOSTiP23882
    PaxDbiP23882
    PRIDEiP23882

    Genome annotation databases

    EnsemblBacteriaiAAC76313; AAC76313; b3288
    BAE78004; BAE78004; BAE78004
    GeneIDi947779
    KEGGiecj:JW3249
    eco:b3288
    PATRICifig|1411691.4.peg.3444

    Organism-specific databases

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

    More...    EchoBASEi    		EB1247

    Phylogenomic databases

    eggNOGiCOG0223, Bacteria
    HOGENOMiCLU_033347_1_2_6
    InParanoidiP23882
    PhylomeDBiP23882

    Enzyme and pathway databases

    BioCyciEcoCyc:EG11268-MONOMER
    MetaCyc:EG11268-MONOMER
    BRENDAi2.1.2.9, 2026

    Miscellaneous databases

    EvolutionaryTraceiP23882

    Protein Ontology

    More...    PROi    		PR:P23882

    Family and domain databases

    CDDicd08646, FMT_core_Met-tRNA-FMT_N, 1 hit
    cd08704, Met_tRNA_FMT_C, 1 hit
    Gene3Di3.10.25.10, 1 hit
    HAMAPiMF_00182, Formyl_trans, 1 hit
    InterProiView protein in InterPro
    IPR005794, Fmt
    IPR005793, Formyl_trans_C
    IPR037022, Formyl_trans_C_sf
    IPR002376, Formyl_transf_N
    IPR036477, Formyl_transf_N_sf
    IPR011034, Formyl_transferase-like_C_sf
    IPR001555, GART_AS
    IPR044135, Met-tRNA-FMT_C
    IPR041711, Met-tRNA-FMT_N
    PfamiView protein in Pfam
    PF02911, Formyl_trans_C, 1 hit
    PF00551, Formyl_trans_N, 1 hit
    SUPFAMiSSF50486, SSF50486, 1 hit
    SSF53328, SSF53328, 1 hit
    TIGRFAMsiTIGR00460, fmt, 1 hit
    PROSITEiView protein in PROSITE
    PS00373, GART, 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 nameiFMT_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: P23882
    Secondary accession number(s): P77040, Q2M6V2
    <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, 1991
    Last sequence update: January 23, 2007
    Last modified: June 2, 2021
    This is version 184 of the entry and version 4 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, 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
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