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Entry version 106 (02 Jun 2021)
Sequence version 1 (21 Jul 1986)
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Protein

Terminase small subunit

Gene

Nu1

Organism
Escherichia phage lambda (Bacteriophage lambda)
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

The small subunit is responsible for the binding to multiple recognition elements within the packaging initiation site cos (PubMed:15755448, PubMed:16618107, PubMed:2989542).

The terminase lies at a unique vertex of the procapsid and is composed of two subunits, a small terminase subunit involved in viral DNA recognition (binding to packaging sequence cos), and a large terminase subunit possessing endonucleolytic, ATPase and helicase activities (DNA maturation and packaging) (Probable). The terminase binds, cooperatively with the host factor IHFA/IHFB, to the cos site at the junction of adjacent viral genomes in the concatemeric DNA (PubMed:16618107).

The endonuclease and helicase activities of the large subunit cleave the viral DNA generating 5'overhangs of 12 bp in length (Probable). The terminase remains bound to the left end of the genome to be packaged, forming a stable DNA-terminase complex (Probable). In a reaction facilitated by the viral assembly catalyst gpFI, the DNA-terminase complex binds to the portal of the procapsid and the terminase packages the viral DNA into the procapsid until the next cos site on the concatemer reaches the complex (Probable). The downstream cos site is then cut generating the mature right end of the genome, the heterotrimer undocks from the DNA-filled head and remains bound to the left end of concatemer's next genome (Probable).

Curated3 Publications

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

<p>This subsection of the 'Function' section 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=469 µM for ATP1 Publication

    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 bindingi31 – 36ATP1 Publication1 Publication6

    <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 functionDNA-binding, Hydrolase
    Biological processViral genome packaging, Viral release from host cell
    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%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:
    Terminase small subunit (EC:3.6.4.-1 Publication1 Publication)
    Alternative name(s):
    DNA-packaging protein Nu1
    Gene product Nu1
    Short name:
    gpNu1
    <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:Nu1
    Ordered Locus Names:lambdap01
    <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 phage lambda (Bacteriophage lambda)
    <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 identifieri10710 [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 lineageiVirusesDuplodnaviriaHeunggongviraeUroviricotaCaudoviricetesCaudoviralesSiphoviridaeLambdavirus
    <p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section only exists in viral entries and indicates the host(s) either as a specific organism or taxonomic group of organisms that are susceptible to be infected by a virus.<p><a href='/help/virus_host' target='_top'>More...</a></p>Virus hostiEscherichia coli [TaxID: 562]
    <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
    • UP000001711 <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: Genome

    <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

    • Host cytoplasm Curated
    • Note: The terminase lies at a unique vertex of the procapsid during viral DNA packaging.Curated

    Keywords - Cellular componenti

    Host 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

    Mutagenesis

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    <p>This subsection of the <a href="http://www.uniprot.org/manual/pathology%5Fand%5Fbiotech%5Fsection">'Pathology and Biotech'</a> section describes the effect of the experimental mutation of one or more amino acid(s) on the biological properties of the protein.<p><a href='/help/mutagen' target='_top'>More...</a></p>Mutagenesisi35K → A or D: Decreased ATPase activity. 1 Publication1
    Mutagenesisi35K → R: No effect on ATPase activity. 1 Publication1

    <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_00000776751 – 181Terminase small subunitAdd BLAST181

    <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

    Heterotrimer of two small and one large terminase subunits (PubMed:15755448). The catalytically competent terminase is composed of a tetramer of heterotrimers (PubMed:30541105, PubMed:16618107). The tetramer forms a ring structure large enough to encircle duplex DNA (PubMed:30541105). Host IHFA/IHFB induces bending of viral DNA to facilitate the assembly of the terminase tetramer of heterotrimers (PubMed:16618107).

    Interacts (via C-terminus) with the terminase large subunit (via N-terminus) (PubMed:2969839).

    4 Publications

    Protein-protein interaction databases

    Protein interaction database and analysis system

    More...
    IntActi
    P03707, 6 interactors

    <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

    1181
    Legend: HelixTurnBeta strandPDB Structure known for this area
    Show more details

    3D structure databases

    Biological Magnetic Resonance Data Bank

    More...
    BMRBi
    P03707

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

    More...
    SMRi
    P03707

    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
    P03707

    <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>Regioni1 – 29Winged helix-turn-helix (wHTH)2 PublicationsAdd BLAST29
    Regioni110 – 140Self-assembly1 PublicationAdd BLAST31
    Regioni141 – 180Binding to terminase large subunit1 PublicationAdd BLAST40

    Coiled coil

    Feature keyPosition(s)DescriptionActionsGraphical viewLength
    <p>This subsection of the 'Family and domains' section denotes the positions of regions of coiled coil within the protein.<p><a href='/help/coiled' target='_top'>More...</a></p>Coiled coili50 – 109Sequence analysisAdd BLAST60

    <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 N-terminus contains a winged helix-turn-helix (wHTH) that binds the viral DNA (PubMed:12049735) (Probable). The N-terminus also contains an ATPase site that regulates DNA binding activity (PubMed:9705918, PubMed:2965248, PubMed:16008350). The central part contains a region for the self-interaction (PubMed:10571997). the C-terminus contains region of interaction with the terminase large subunit (PubMed:10571997) (Probable).1 Publication5 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 terminase small subunit family.Curated

    Keywords - Domaini

    Coiled coil

    Family and domain databases

    Gene3D Structural and Functional Annotation of Protein Families

    More...
    Gene3Di
    1.10.10.10, 1 hit

    Integrated resource of protein families, domains and functional sites

    More...
    InterProi
    View protein in InterPro
    IPR009061, DNA-bd_dom_put_sf
    IPR010906, Phage_lambda_Nu1_terminase-ssu
    IPR036388, WH-like_DNA-bd_sf

    Pfam protein domain database

    More...
    Pfami
    View protein in Pfam
    PF07471, Phage_Nu1, 1 hit

    Superfamily database of structural and functional annotation

    More...
    SUPFAMi
    SSF46955, SSF46955, 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.

    P03707-1 [UniParc]FASTAAdd to basket
    « Hide
            10         20         30         40         50
    MEVNKKQLAD IFGASIRTIQ NWQEQGMPVL RGGGKGNEVL YDSAAVIKWY
    60 70 80 90 100
    AERDAEIENE KLRREVEELR QASEADLQPG TIEYERHRLT RAQADAQELK
    110 120 130 140 150
    NARDSAEVVE TAFCTFVLSR IAGEIASILD GLPLSVQRRF PELENRHVDF
    160 170 180
    LKRDIIKAMN KAAALDELIP GLLSEYIEQS G
    Length:181
    Mass (Da):20,441
    Last modified:July 21, 1986 - 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:iA25A5EAEF7BF18A4
    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
    J02459 Genomic DNA Translation: AAA96533.1

    Protein sequence database of the Protein Information Resource

    More...
    PIRi
    C04333, JVBPNL

    NCBI Reference Sequences

    More...
    RefSeqi
    NP_040580.1, NC_001416.1

    Genome annotation databases

    Database of genes from NCBI RefSeq genomes

    More...
    GeneIDi
    2703523

    KEGG: Kyoto Encyclopedia of Genes and Genomes

    More...
    KEGGi
    vg:2703523

    <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
    J02459 Genomic DNA Translation: AAA96533.1
    PIRiC04333, JVBPNL
    RefSeqiNP_040580.1, NC_001416.1

    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
    1J9INMR-A/B1-68[»]
    6HN7X-ray3.00B1-98[»]
    BMRBiP03707
    SMRiP03707
    ModBaseiSearch...
    PDBe-KBiSearch...

    Protein-protein interaction databases

    IntActiP03707, 6 interactors

    Genome annotation databases

    GeneIDi2703523
    KEGGivg:2703523

    Miscellaneous databases

    EvolutionaryTraceiP03707

    Family and domain databases

    Gene3Di1.10.10.10, 1 hit
    InterProiView protein in InterPro
    IPR009061, DNA-bd_dom_put_sf
    IPR010906, Phage_lambda_Nu1_terminase-ssu
    IPR036388, WH-like_DNA-bd_sf
    PfamiView protein in Pfam
    PF07471, Phage_Nu1, 1 hit
    SUPFAMiSSF46955, SSF46955, 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 nameiTERS_LAMBD
    <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: P03707
    <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: July 21, 1986
    Last sequence update: July 21, 1986
    Last modified: June 2, 2021
    This is version 106 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 programViral 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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