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Entry version 109 (11 Dec 2019)
Sequence version 2 (01 Nov 1995)
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Protein

Large T antigen

Gene
N/A
Organism
Budgerigar fledgling disease virus (BFPyV) (Aves polyomavirus 1)
Status
Reviewed-Annotation score:

Annotation score:4 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>
-Protein inferred from homologyi <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

Isoform large T antigen is a key early protein essential for both driving viral replication and inducing cellular transformation. Plays a role in viral genome replication by driving entry of quiescent cells into the cell cycle and by autoregulating the synthesis of viral early mRNA. Displays highly oncogenic activities by corrupting the host cellular checkpoint mechanisms that guard cell division and the transcription, replication, and repair of DNA. Participates in the modulation of cellular gene expression preceeding viral DNA replication. This step involves binding to host key cell cycle regulators retinoblastoma protein RB1/pRb and TP53. Induces the disassembly of host E2F1 transcription factors from RB1, thus promoting transcriptional activation of E2F1-regulated S-phase genes. Inhibits host TP53 binding to DNA, abrogating the ability of TP53 to stimulate gene expression. Plays the role of a TFIID-associated factor (TAF) in transcription initiation for all three RNA polymerases, by stabilizing the TBP-TFIIA complex on promoters. Initiates viral DNA replication and unwinding via interactions with the viral origin of replication. Binds two adjacent sites in the SV40 origin. The replication fork movement is facilitated by Large T antigen helicase activity. Activates the transcription of viral late mRNA, through host TBP and TFIIA stabilization. Interferes with histone deacetylation mediated by HDAC1, leading to activation of transcription (By similarity).By similarity

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section specifies the position and type of each DNA-binding domain present within the protein.<p><a href='/help/dna_bind' target='_top'>More...</a></p>DNA bindingi102 – 219T-ag OBDPROSITE-ProRule annotationAdd BLAST118
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section specifies the position(s) and type(s) of zinc fingers within the protein.<p><a href='/help/zn_fing' target='_top'>More...</a></p>Zinc fingeri221 – 319T-ag D1-typePROSITE-ProRule annotationAdd BLAST99
<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 bindingi386 – 393ATPPROSITE-ProRule annotation8

<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 processDNA replication, G1/S host cell cycle checkpoint dysregulation by virus, Host-virus interaction, Inhibition of host innate immune response by virus, Inhibition of host interferon signaling pathway by virus, Inhibition of host JAK1 by virus, Modulation of host cell cycle by virus, Viral immunoevasion
LigandATP-binding, Metal-binding, Nucleotide-binding, Zinc

<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:
Large T antigen (EC:3.6.4.-)
Short name:
LT
Short name:
LT-AG
<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>OrganismiBudgerigar fledgling disease virus (BFPyV) (Aves polyomavirus 1)
<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 identifieri1891747 [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 lineageiVirusesPolyomaviridaeGammapolyomavirus
<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 hostiPsittacidae (parrots) [TaxID: 9224]
<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
  • UP000134051 <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

GO - Cellular componenti

Keywords - Cellular componenti

Host nucleus

<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.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00001150351 – 587Large T antigenAdd BLAST587

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM/processing</a> section describes post-translational modifications (PTMs). This subsection <strong>complements</strong> the information provided at the sequence level or describes modifications for which <strong>position-specific data is not yet available</strong>.<p><a href='/help/post-translational_modification' target='_top'>More...</a></p>Post-translational modificationi

Phosphorylated on both serine and threonine residues. Small t antigen inhibits the dephosphorylation by the AC form of PP2A (By similarity).By similarity
O-Glycosylated near the C-terminal region.By similarity
Acetylated by CBP in a TP53-dependent manner.By similarity

Keywords - PTMi

Phosphoprotein

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

Keywords - Developmental stagei

Early protein

<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

Forms homohexamers in the presence of ATP.

Interacts with host HDAC1.

Interacts (via LXCXE domain) with host RB1; the interaction induces the aberrant dissociation of RB1-E2F1 complex thereby disrupting RB1's activity.

Interacts (via LXCXE domain) with host pRB-related proteins RBL1 and RBL2.

Interacts (via C-terminus) with host TOP1 and POLA1 allowing DNA replication.

Interacts with host TP53, inhibiting TP53 binding to DNA.

Interacts with host preinitiation complex components TBP, TFIIA and TFIID to regulate transcription initiation (By similarity).

By similarity

<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

3D structure databases

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

More...
SMRi
P13894

Database of comparative protein structure models

More...
ModBasei
Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini6 – 82JPROSITE-ProRule annotationAdd BLAST77
Domaini360 – 520SF3 helicasePROSITE-ProRule annotationAdd BLAST161

<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 J domain is essential for multiple viral activities, including virion assembly, viral DNA replication, transformation and transcriptional activation.By similarity
The LXCXE motif specifically binds to host pRB, RBL1, and RBL2.By similarity
The zinc finger region contributes to protein-protein interactions essential for the assembly of stable T-antigen hexamers at the origin of replication. The hexamers are required for subsequent alterations in the structure of origin DNA (By similarity).By similarity
The ATP binding/ATPase domain is required for proper hexamer assembly and helicase activity.By similarity

Zinc finger

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Zinc fingeri221 – 319T-ag D1-typePROSITE-ProRule annotationAdd BLAST99

Keywords - Domaini

Zinc-finger

Family and domain databases

Conserved Domains Database

More...
CDDi
cd06257 DnaJ, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
1.10.287.110, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR001623 DnaJ_domain
IPR014015 Helicase_SF3_DNA-vir
IPR036869 J_dom_sf
IPR010932 Lg_T_Ag_Polyomavir_C
IPR027417 P-loop_NTPase
IPR003133 T_Ag_DNA-bd
IPR017910 Znf_lg_T-Ag_D1-typ

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00226 DnaJ, 1 hit
PF06431 Polyoma_lg_T_C, 1 hit
PF02217 T_Ag_DNA_bind, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00271 DnaJ, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF46565 SSF46565, 1 hit
SSF52540 SSF52540, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS50076 DNAJ_2, 1 hit
PS51206 SF3_HELICASE_1, 1 hit
PS51287 T_AG_OBD, 1 hit
PS51341 ZF_LTAG_D1, 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>Sequences (2)i

<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.

This entry describes 2 <p>This subsection of the 'Sequence' section lists the alternative protein sequences (isoforms) that can be generated from the same gene by a single or by the combination of up to four biological events (alternative promoter usage, alternative splicing, alternative initiation and ribosomal frameshifting). Additionally, this section gives relevant information on each alternative protein isoform.<p><a href='/help/alternative_products' target='_top'>More...</a></p> isoformsi produced by alternative splicing. AlignAdd to basket
Isoform Large T antigen (identifier: P13894-1) [UniParc]FASTAAdd to basket

This isoform has been chosen as the <div> <p><b>What is the canonical sequence?</b><p><a href='/help/canonical_and_isoforms' target='_top'>More...</a></p>canonicali sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide
        10         20         30         40         50
MASLRRLTEL LCLPVTATAA DIKTAYRRTA LKYHPDKGGD EEKMKELNTL
60 70 80 90 100
MEEFRETEGL RADETLEDSD PEPEESGYAT FENVSVPDID GAFFKLMKLK
110 120 130 140 150
KCMQTYFSVN ERRKQQSCPD CHLLITSITK MPQLKAHLYE HFGIKGHIVA
160 170 180 190 200
HWTGIALLVL QLEKPTRIST VHNFCKKYCT ISICSVRGIK KNCVHALIKT
210 220 230 240 250
LLDVPGLDLE ECSIDMNVVD EKQFMHAMLY DYAVQIDCTD ALLLLAIYKR
260 270 280 290 300
LAQPTDKCPE CQKDKDTVKR KRSTHIDDHP RHQHNASLFL HIKDQKRLCQ
310 320 330 340 350
CAVDAVLAEK RFRSATMTRD ERLKERFRTV LRNIQELLDG ETEAIDDFVT
360 370 380 390 400
AILLFNMLFP DVDVIVDILQ TMVKNPPKRR YYIFKGPVNT GKTTVAAAIL
410 420 430 440 450
ALCTGASLNV NGTPDRLQFE LGCAIDQFMV LFEDVKGTPE PDTNLPSGFG
460 470 480 490 500
MVNLDNLRDH LEGSVPVNLE RKHQNKVSQI FPPGIITMNN YVLPHTIQAR
510 520 530 540 550
ARTLVNFKHI KVYAKALRNN ISVLEQRLIT KPETLLAYLL IRPESEKEIS
560 570 580
ADLRAEFLTV IENLKFEVDE RFFQYNNRLH EGLCVHE
Length:587
Mass (Da):67,133
Last modified:November 1, 1995 - 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:i73E5D71DA92EB873
GO
Isoform Small t antigen (identifier: P13895-1) [UniParc]FASTAAdd to basket
The sequence of this isoform can be found in the external entry P13895.
Isoforms of the same protein are often annotated in two different entries if their sequences differ significantly.
Length:145
Mass (Da):16,988
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
M20775 Genomic DNA Translation: AAB59760.1

Protein sequence database of the Protein Information Resource

More...
PIRi
D29194 TVVPBF

Keywords - Coding sequence diversityi

Alternative splicing

<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
M20775 Genomic DNA Translation: AAB59760.1
PIRiD29194 TVVPBF

3D structure databases

SMRiP13894
ModBaseiSearch...

Family and domain databases

CDDicd06257 DnaJ, 1 hit
Gene3Di1.10.287.110, 1 hit
InterProiView protein in InterPro
IPR001623 DnaJ_domain
IPR014015 Helicase_SF3_DNA-vir
IPR036869 J_dom_sf
IPR010932 Lg_T_Ag_Polyomavir_C
IPR027417 P-loop_NTPase
IPR003133 T_Ag_DNA-bd
IPR017910 Znf_lg_T-Ag_D1-typ
PfamiView protein in Pfam
PF00226 DnaJ, 1 hit
PF06431 Polyoma_lg_T_C, 1 hit
PF02217 T_Ag_DNA_bind, 1 hit
SMARTiView protein in SMART
SM00271 DnaJ, 1 hit
SUPFAMiSSF46565 SSF46565, 1 hit
SSF52540 SSF52540, 1 hit
PROSITEiView protein in PROSITE
PS50076 DNAJ_2, 1 hit
PS51206 SF3_HELICASE_1, 1 hit
PS51287 T_AG_OBD, 1 hit
PS51341 ZF_LTAG_D1, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiLT_BFPYV
<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: P13894
<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: January 1, 1990
Last sequence update: November 1, 1995
Last modified: December 11, 2019
This is version 109 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

Reference proteome
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