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Entry version 102 (25 May 2022)
Sequence version 2 (23 Jan 2007)
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Protein

Capsid protein

Gene
N/A
Organism
Escherichia virus Qbeta (Bacteriophage Q-beta)
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

Capsid protein self-assembles to form an icosahedral capsid with a T=3 symmetry, about 26 nm in diameter, and consisting of 89 capsid proteins dimers (178 capsid proteins) (PubMed:27671640, PubMed:19913556).

Involved in viral genome encapsidation through the interaction between a capsid protein dimer and the multiple packaging signals present in the RNA genome (PubMed:8943226, PubMed:27671640).

Binding of the capsid proteins to the viral RNA induces a conformational change required for efficient T=3 shell formation (PubMed:19913556).

The capsid contains also 1 copy of the A2 maturation protein (PubMed:27671640).

3 Publications

Acts as a translational repressor of viral replicase synthesis late in infection. This latter function is the result of capsid protein interaction with an RNA hairpin which contains the replicase ribosome-binding site.

1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection describes interesting single amino acid sites on the sequence that are not defined in any other subsection. This subsection can be displayed in different sections ('Function', 'PTM / Processing', 'Pathology and Biotech') according to its content.<p><a href='/help/site' target='_top'>More...</a></p>Sitei90RNA-binding1 Publication1

<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

<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 functionRNA-binding
Biological processTranslation regulation

<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:
Capsid protein
Short name:
CP
Alternative name(s):
Coat protein
<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 virus Qbeta (Bacteriophage Q-beta)
<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 identifieri39803 [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 lineageiVirusesRiboviriaOrthornaviraeLenarviricotaAllassoviricetesLeviviralesLeviviridaeAllolevivirus
<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
  • UP000305125 <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
  • UP000306921 Componenti: Genome
  • UP000185268 Componenti: Genome
  • UP000309733 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

Keywords - Cellular componenti

Capsid protein, T=3 icosahedral capsid protein, Virion

<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>Mutagenesisi33V → A: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi50T → A: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi57S → P: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi60R → C: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi62N → D: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi64K → E: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi90Y → H: Decreased RNA-binding to the viral operator and loss of repressor activity. 1 Publication1
Mutagenesisi96S → L: Decreased RNA-binding to the viral operator and loss of repressor 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 <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; by host1 Publication
<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_00001648462 – 133Capsid proteinAdd BLAST132

<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 (PubMed:16531233). The homodimers binds to the viral RNA via an operator hairpin, but also to many other RNA sequences in the viral genome; this interaction probably shifts the virus from the replicative to the assembly phase and ensures specific encapsidation of the viral genome (PubMed:8943226, PubMed:16531233).

Interacts with the maturation protein A2 (PubMed:28111107, PubMed:29078304).

4 Publications

<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

1133
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

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SMRi
P03615

Database of comparative protein structure models

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ModBasei
Search...

Protein Data Bank in Europe - Knowledge Base

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PDBe-KBi
Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...
EvolutionaryTracei
P03615

<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

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

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Gene3Di
3.30.380.10, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR002703, Levivir_coat
IPR015954, Phage_RNA-type_capsid

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF01819, Levi_coat, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF55405, SSF55405, 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.

P03615-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MAKLETVTLG NIGKDGKQTL VLNPRGVNPT NGVASLSQAG AVPALEKRVT
60 70 80 90 100
VSVSQPSRNR KNYKVQVKIQ NPTACTANGS CDPSVTRQAY ADVTFSFTQY
110 120 130
STDEERAFVR TELAALLASP LLIDAIDQLN PAY
Length:133
Mass (Da):14,254
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:i1B7967F0256C31DE
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 conflicti23N → D AA sequence (PubMed:5570434).Curated1
Sequence conflicti57Missing AA sequence (PubMed:5570434).Curated1

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section describes natural variant(s) of the protein sequence.<p><a href='/help/variant' target='_top'>More...</a></p>Natural varianti34A → S in strain: Qbeta_3_FR. 1 Publication1
Natural varianti76T → A in strain: QB_1 and Qbeta_1_FR. 2 Publications1

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

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EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

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DDBJi
Links Updated
M99039 Unassigned DNA Translation: AAA16662.1
AY099114 Genomic RNA Translation: AAM33126.1
GQ153928 Genomic RNA Translation: ACY07224.1
GQ153929 Genomic RNA Translation: ACY07228.1
GQ153930 Genomic RNA Translation: ACY07232.1
GQ153931 Genomic RNA Translation: ACY07236.1
JF719735 Genomic RNA Translation: AEQ25542.1
JF719736 Genomic RNA Translation: AEQ25546.1
JF719737 Genomic RNA Translation: AEQ25550.1
AB971354 Genomic RNA Translation: BAP18764.1
V00643 mRNA Translation: CAA23992.1

Protein sequence database of the Protein Information Resource

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PIRi
A92240, VCBPQB

<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

<p>This subsection of the <a href="http://www.uniprot.org/manual/cross%5Freferences%5Fsection">Cross-references</a> section provides links to various web resources that are relevant for a specific protein.<p><a href='/help/web_resource' target='_top'>More...</a></p>Web resourcesi

Virus Particle ExploreR db

Icosahedral capsid structure

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
M99039 Unassigned DNA Translation: AAA16662.1
AY099114 Genomic RNA Translation: AAM33126.1
GQ153928 Genomic RNA Translation: ACY07224.1
GQ153929 Genomic RNA Translation: ACY07228.1
GQ153930 Genomic RNA Translation: ACY07232.1
GQ153931 Genomic RNA Translation: ACY07236.1
JF719735 Genomic RNA Translation: AEQ25542.1
JF719736 Genomic RNA Translation: AEQ25546.1
JF719737 Genomic RNA Translation: AEQ25550.1
AB971354 Genomic RNA Translation: BAP18764.1
V00643 mRNA Translation: CAA23992.1
PIRiA92240, VCBPQB

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...
PDBei

Protein Data Bank RCSB

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RCSB PDBi

Protein Data Bank Japan

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PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1QBEX-ray3.50A/B/C2-133[»]
4L8HX-ray2.40A/B2-133[»]
5KIPelectron microscopy3.70A/B/C1-133[»]
5VLYelectron microscopy3.30A/B/C1-133[»]
5VLZelectron microscopy4.40AA/AB/AC/AD/AE/AF/AG/AH/AI/AJ/AK/AL/AM/AN/BA/BB/BC/BD/BE/BF/BG/BH/BI/BJ/BK/BL/BM/BN/CA/CB1-133[»]
7LGEelectron microscopy5.60A/B/C/D1-133[»]
7LGFelectron microscopy6.10A/B/C/D/E/F/G/H/I/J/K/L/M/N/O/P/Q/R/S/T/U1-133[»]
7LGGelectron microscopy6.20A/B/C/D/E/F/G/H/I/J/K/L/M/N/O1-133[»]
7LGHelectron microscopy8.90A/B/C/D/E/F/G/H/I/J/K/L/M/N/O/P/Q/R/S/T/U/V1-133[»]
7LHDelectron microscopy4.60B/BA/BB/BC/BD/BE/BF/BG/BH/BI/BJ/BK/BL/BM/BN/CA/CB/CC/CD/CE/CF/CG/CH/CI/CJ/CK/CL/CM/CN/D1-133[»]
SMRiP03615
ModBaseiSearch...
PDBe-KBiSearch...

Miscellaneous databases

EvolutionaryTraceiP03615

Family and domain databases

Gene3Di3.30.380.10, 1 hit
InterProiView protein in InterPro
IPR002703, Levivir_coat
IPR015954, Phage_RNA-type_capsid
PfamiView protein in Pfam
PF01819, Levi_coat, 1 hit
SUPFAMiSSF55405, SSF55405, 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 nameiCAPSD_BPQBE
<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: P03615
Secondary accession number(s): D0U1F3, G4WZR7, Q774G0
<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: January 23, 2007
Last modified: May 25, 2022
This is version 102 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 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
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