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UniProtKB/Swiss-Prot entry P03070


[Entry info] [Name and origin] [References] [Comments] [Cross-references] [Keywords] [Features] [Sequence] [Tools]

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Entry information
Entry name LT_SV40
Primary accession number P03070
Secondary accession numbers None
Integrated into Swiss-Prot on July 21, 1986
Sequence was last modified on February 1, 1996 (Sequence version 2)
Annotations were last modified on    September 23, 2008 (Entry version 87)
Name and origin of the protein
Protein name Large T antigen
Synonyms LT-AG
LT
Gene name None
From
Simian virus 40 (SV40) [TaxID: 10633] 
Taxonomy Viruses; dsDNA viruses, no RNA stage; Polyomaviridae; Polyomavirus.
Virus host Macaca (macaques) [TaxID: 9539]
Protein existence 1: Evidence at protein level;
References
[1]
NUCLEOTIDE SEQUENCE [GENOMIC DNA].
PubMed=205947 [NCBI, ExPASy, EBI, Israel, Japan]
Reddy V.B., Thimmappaya B., Dhar R., Subramanian K.N., Zain B.S., Pan J., Ghosh P.K., Celma M.L., Weissman S.M.;
"The genome of simian virus 40.";
Science 200:494-502(1978).
[2]
NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND ACETYLATION AT MET-1.
STRAIN=776;
DOI=10.1038/273113a0; PubMed=205802 [NCBI, ExPASy, EBI, Israel, Japan]
Fiers W., Contreras R., Haegeman G., Rogiers R., van de Voorde A., van Heuverswyn H., van Herreweghe J., Volckaert G., Ysebaert M.;
"Complete nucleotide sequence of SV40 DNA.";
Nature 273:113-120(1978).
[3]
NUCLEAR LOCALIZATION SIGNAL.
DOI=10.1016/0092-8674(84)90457-4; PubMed=6096007 [NCBI, ExPASy, EBI, Israel, Japan]
Kalderon D., Roberts B.L., Richardson W.D., Smith A.E.;
"A short amino acid sequence able to specify nuclear location.";
Cell 39:499-509(1984).
[4]
ZINC-FINGER DOMAIN.
PubMed=2173794 [NCBI, ExPASy, EBI, Israel, Japan]
Hoess A., Moarefi I.F., Fanning E., Arthur A.K.;
"The finger domain of simian virus 40 large T antigen controls DNA-binding specificity.";
J. Virol. 64:6291-6296(1990).
[5]
ZINC-FINGER DOMAIN.
PubMed=1851875 [NCBI, ExPASy, EBI, Israel, Japan]
Loeber G., Stenger J.E., Ray S., Parsons R.E., Anderson M.E., Tegtmeyer P.;
"The zinc finger region of simian virus 40 large T antigen is needed for hexamer assembly and origin melting.";
J. Virol. 65:3167-3174(1991).
[6]
ASSOCIATION WITH HOST RB PROTEIN.
DOI=10.1016/0092-8674(88)90559-4; PubMed=2839300 [NCBI, ExPASy, EBI, Israel, Japan]
Decaprio J.A., Ludlow J.W., Figge J., Shew J.-Y., Huang C.-M., Lee W.-H., Marsilio E., Paucha E., Livingston D.M.;
"SV40 large tumor antigen forms a specific complex with the product of the retinoblastoma susceptibility gene.";
Cell 54:275-283(1988).
[7]
IN VITRO PHOSPHORYLATION.
DOI=10.1016/0042-6822(88)90653-8; PubMed=2838952 [NCBI, ExPASy, EBI, Israel, Japan]
Graesser F.A., Scheidmann K.H., Tuazon P.T., Traugh J.A., Walter G.;
"In vitro phosphorylation of SV40 large T antigen.";
Virology 165:13-22(1988).
[8]
PROTEIN SEQUENCE OF 102-118, AND PHOSPHORYLATION AT THR-124 BY CDC2.
DOI=10.1038/341503a0; PubMed=2552322 [NCBI, ExPASy, EBI, Israel, Japan]
McVey D., Brizuela L., Mohr I., Marshak D.R., Gluzman Y., Beach D.;
"Phosphorylation of large tumour antigen by cdc2 stimulates SV40 DNA replication.";
Nature 341:503-507(1989).
[9]
IN VITRO ACTIVATION OF DNA REPLICATION BY PP2A.
PubMed=2555176 [NCBI, ExPASy, EBI, Israel, Japan]
Virshup D.M., Kauffman M.G., Kelly T.J.;
"Activation of SV40 DNA replication in vitro by cellular protein phosphatase 2A.";
EMBO J. 8:3891-3898(1989).
[10]
REGULATION OF REPLICATION BY PHOSPHORYLATION.
DOI=10.1016/0092-8674(90)90179-I; PubMed=2160857 [NCBI, ExPASy, EBI, Israel, Japan]
Prives C.;
"The replication functions of SV40 T antigen are regulated by phosphorylation.";
Cell 61:735-738(1990).
[11]
DEPHOSPHORYLATION BY HOST PP2A.
PubMed=1848668 [NCBI, ExPASy, EBI, Israel, Japan]
Scheidtmann K.H., Mumby M.C., Rundell K., Walter G.;
"Dephosphorylation of simian virus 40 large-T antigen and p53 protein by protein phosphatase 2A: inhibition by small-t antigen.";
Mol. Cell. Biol. 11:1996-2003(1991).
[12]
SITES OF DEPHOSPHORYLATION BY HOST PP2A.
PubMed=1848320 [NCBI, ExPASy, EBI, Israel, Japan]
Scheidtmann K.H., Virshup D.M., Kelly T.J.;
"Protein phosphatase 2A dephosphorylates simian virus 40 large T antigen specifically at residues involved in regulation of DNA-binding activity.";
J. Virol. 65:2098-2101(1991).
[13]
INTERACTION WITH HUMAN RB1.
PubMed=1316611 [NCBI, ExPASy, EBI, Israel, Japan]
Chellappan S., Kraus V.B., Kroger B., Munger K., Howley P.M., Phelps W.C., Nevins J.R.;
"Adenovirus E1A, simian virus 40 tumor antigen, and human papillomavirus E7 protein share the capacity to disrupt the interaction between transcription factor E2F and the retinoblastoma gene product.";
Proc. Natl. Acad. Sci. U.S.A. 89:4549-4553(1992).
[14]
ACTIVATION OF REPLICATION BY PHOSPHORYLATION ON THR-124, AND MUTAGENESIS OF THR-124.
PubMed=8648725 [NCBI, ExPASy, EBI, Israel, Japan]
McVey D., Woelker B., Tegtmeyer P.;
"Mechanisms of simian virus 40 T-antigen activation by phosphorylation of threonine 124.";
J. Virol. 70:3887-3893(1996).
[15]
GLYCOSYLATION AT SER-111 AND SER-112, AND MUTAGENESIS OF SER-111 AND SER-112.
DOI=10.1093/glycob/8.4.383; PubMed=9499386 [NCBI, ExPASy, EBI, Israel, Japan]
Medina L., Grove K., Haltiwanger R.S.;
"SV40 large T antigen is modified with O-linked N-acetylglucosamine but not with other forms of glycosylation.";
Glycobiology 8:383-391(1998).
[16]
FUNCTION, AND INTERACTION WITH HOST HDAC1.
DOI=10.1093/nar/gkl1113; PubMed=17341466 [NCBI, ExPASy, EBI, Israel, Japan]
Valls E., Blanco-Garcia N., Aquizu N., Piedra D., Estaras C., de la Cruz X., Martinez-Balbas M.A.;
"Involvement of chromatin and histone deacetylation in SV40 T antigen Transcription; regulation.";
Nucleic Acids Res. 35:1958-1968(2007).
[17]
X-RAY CRYSTALLOGRAPHY (3.2 ANGSTROMS) OF 7-117.
DOI=10.1093/emboj/20.1.295; PubMed=11226179 [NCBI, ExPASy, EBI, Israel, Japan]
Kim H.-Y., Ahn B.-Y., Cho Y.;
"Structural basis for the inactivation of retinoblastoma tumor suppressor by SV40 large T antigen.";
EMBO J. 20:295-304(2001).
[18]
X-RAY CRYSTALLOGRAPHY (2.8 ANGSTROMS) OF 260-627.
DOI=10.1038/nature01691; PubMed=12774115 [NCBI, ExPASy, EBI, Israel, Japan]
Li D., Zhao R., Lilyestrom W., Gai D., Zhang R., DeCaprio J.A., Fanning E., Jochimiak A., Szakonyi G., Chen X.S.;
"Structure of the replicative helicase of the oncoprotein SV40 large tumour antigen.";
Nature 423:512-518(2003).
[19]
X-RAY CRYSTALLOGRAPHY (1.95 ANGSTROMS) OF 251-627.
DOI=10.1016/j.cell.2004.09.017; PubMed=15454080 [NCBI, ExPASy, EBI, Israel, Japan]
Gai D., Zhao R., Li D., Finkielstein C.V., Chen X.S.;
"Mechanisms of conformational change for a replicative hexameric helicase of SV40 large tumor antigen.";
Cell 119:47-60(2004).
Comments
  • FUNCTION: Initiates DNA unwinding and replication via elaborate interactions with the viral origin of replication. Binds two adjacent sites in the SV40 origin.
  • FUNCTION: Large T antigen has both transforming and trans-activating activities. Disrupts the function of host retinoblastoma protein RB1/pRb, which is a key regulator of the cell cycle. Induces the disassembly of the E2F1 transcription factors from RB1, with subsequent transcriptional activation of E2F1-regulated S-phase genes. Inactivation of the ability of RB1 to arrest the cell cycle is critical for cellular transformation, uncontrolled cellular growth and proliferation induced by viral infection. Stimulation of progression from G1 to S phase allows the virus to efficiently use the cellular DNA replicating machinery to achieve viral genome replication. Interferes with histone deacetylation mediated by HDAC1, leading to activation of transcription (Probable).
  • SUBUNIT: Forms homohexamers in the presence of ATP. Interacts with HDAC1 in vitro in an Rb-independent manner. Interaction with host RB1 induces the aberrant dissociation of RB1-E2F1 complex thereby disrupting RB1's activity.
  • INTERACTION:
    P01106:MYC (xeno); NbExp=1; IntAct=EBI-617698, EBI-447544;
    P04637:TP53 (xeno); NbExp=3; IntAct=EBI-617698, EBI-366083;
    P02340:Tp53 (xeno); NbExp=5; IntAct=EBI-617698, EBI-474016;
  • SUBCELLULAR LOCATION: Nucleus.
  • ALTERNATIVE PRODUCTS: 2 named isoforms [FASTA] produced by alternative splicing.
    NameLarge T antigen
    Isoform IDP03070-1
    This is the isoform sequence displayed in this entry.
    NameSmall t antigen
    Isoform IDP03081-1
    This isoform is stored in UniProtKB/Swiss-Prot entry P03081.
  • DOMAIN: The zinc finger region contributes to protein-protein interactions essential for the assembly of stable T-antigen hexamers at the origin of replication and hexamers are needed for subsequent alterations in the structure of origin DNA.
  • PTM: Phosphorylated on both serine and threonine residues. Phosphorylation on Ser-120 and Ser-123 inhibits viral replication, while that on Thr-124 enhances replication by activating the DNA-binding domain.
  • PTM: Dephosphorylated preferentially by PP2A on serine residues 120, 123, 677 and perhaps 679. Small t antigen inhibits the dephosphorylation by the AC form of PP2A, consisting of the catalytic subunit and the regulatory A subunit.
  • PTM: O-glycosylated at 2 or 3 serine residues, including Ser-111 and/or Ser-112.
  • SIMILARITY: Contains 1 J domain.
  • SIMILARITY: Contains 1 SF3 helicase domain.
  • SIMILARITY: Contains 1 T-ag D1-type zinc finger.
  • SIMILARITY: Contains 1 T-ag OBD DNA-binding domain.
Copyright
Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms. Distributed under the Creative Commons Attribution-NoDerivs License.
Cross-references
Sequence databases
EMBL
J02400; AAB59924.1; -; Genomic_DNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
RefSeq NP_043127.1; -.
3D structure databases
PDB
1EJL; X-ray; 2.80 A; A/B=126-132.[ExPASy / RCSB / EBI]
1GH6; X-ray; 3.20 A; A=7-117.[ExPASy / RCSB / EBI]
1N25; X-ray; 2.80 A; A/B=260-627.[ExPASy / RCSB / EBI]
1Q1S; X-ray; 2.30 A; B=110-133.[ExPASy / RCSB / EBI]
1Q1T; X-ray; 2.50 A; A/B=110-133.[ExPASy / RCSB / EBI]
1SVL; X-ray; 1.95 A; A/B/C=251-627.[ExPASy / RCSB / EBI]
1SVM; X-ray; 1.94 A; A/B/C/D/E/F=251-627.[ExPASy / RCSB / EBI]
1SVO; X-ray; 2.60 A; A/B=251-627.[ExPASy / RCSB / EBI]
1TBD; NMR; -; A=131-260.[ExPASy / RCSB / EBI]
1Z1D; NMR; -; B=131-259.[ExPASy / RCSB / EBI]
2FUF; X-ray; 1.45 A; A=131-262.[ExPASy / RCSB / EBI]
2H1L; X-ray; 3.16 A; A/B/C/D/E/F/G/H/I/J/K/L=260-627.[ExPASy / RCSB / EBI]
2IF9; X-ray; 2.59 A; A/B=131-262.[ExPASy / RCSB / EBI]
2IPR; X-ray; 1.50 A; A/B=131-259.[ExPASy / RCSB / EBI]
2ITJ; X-ray; 2.50 A; A/B=131-259.[ExPASy / RCSB / EBI]
2ITL; X-ray; 1.65 A; A/B=131-259.[ExPASy / RCSB / EBI]
2NL8; X-ray; 2.30 A; A=131-259.[ExPASy / RCSB / EBI]
2NTC; X-ray; 2.40 A; A/B=131-262.[ExPASy / RCSB / EBI]
2TBD; NMR; -; A=131-262.[ExPASy / RCSB / EBI]
Detailed list of linked structures.
PDBsum 1EJL; -.
1GH6; -.
1N25; -.
1Q1S; -.
1Q1T; -.
1SVL; -.
1SVM; -.
1SVO; -.
1TBD; -.
1Z1D; -.
2FUF; -.
2H1L; -.
2IF9; -.
2IPR; -.
2ITJ; -.
2ITL; -.
2NL8; -.
2NTC; -.
2TBD; -.
ModBase P03070.
Protein-protein interaction databases
DIP DIP:24251N; -.
IntAct P03070; -.
PTM databases
GlycoSuiteDB P03070; -.
Ontologies
GO
GO:0005515; Molecular function: protein binding (inferred from physical interaction from UniProtKB).
QuickGo view.
Family and domain databases
InterPro IPR001623; DnaJ_N.
IPR014015; Helicase_SF3_DNA-vir.
IPR016392; Lg_T_Ag_polyomavir.
IPR010932; Lg_T_Ag_Polyomavir_C.
IPR003133; T_Ag_DNA_bd.
Graphical view of domain structure.
Gene3D G3DSA:1.10.287.110; DnaJ_N; 1.
Pfam PF00226; DnaJ; 1.
PF06431; Polyoma_lg_T_C; 1.
PF02217; T_Ag_DNA_bind; 1.
Pfam graphical view of domain structure.
PIRSF PIRSF003368; Large_T_antigen_polyomaV; 1.
SMART SM00271; DnaJ; 1.
SMART graphical view of domain structure.
PROSITE PS00636; DNAJ_1; FALSE_NEG.
PS50076; DNAJ_2; 1.
PS51206; SF3_HELICASE_1; 1.
PS51287; T_AG_OBD; 1.
PS51341; ZF_LTAG_D1; 1.
PROSITE graphical view of domain structure (profiles).
BLOCKS P03070.
ProtoNet P03070.
Genome annotation databases
GeneID 1489531; -.
Other
LinkHub P03070; -.
UniRef View cluster of proteins with at least 50% / 90% / 100% identity.
Keywords
3D-structure; Acetylation; Alternative splicing; ATP-binding; Direct protein sequencing; DNA replication; DNA-binding; Early protein; Glycoprotein; Host-virus interaction; Metal-binding; Nucleotide-binding; Nucleus; Oncogene; Phosphoprotein; Zinc; Zinc-finger.
Features
SEVIEWER logo Feature table viewer FT aligner logo Feature aligner
KeyFrom   To Length Description FTId
CHAIN   1   708  708     Large T antigen. PRO_0000115046
DOMAIN   12    75  64     J. 
DOMAIN   400   560  161     SF3 helicase. 
DNA_BIND   139   254  116     T-ag OBD. 
ZN_FING   265   357  93     T-ag D1-type. 
NP_BIND   426   433  8     ATP (Potential). 
REGION   103   107  5     Interaction with host RB1 protein and transforming activity. 
REGION   337   672  336     Binding to host p53 protein. 
MOTIF   125   132  8     Nuclear localization signal. 
COMPBIAS   286   289  4     Poly-Leu. 
COMPBIAS   633   638  6     Poly-Asp. 
MOD_RES   1     1        N-acetylmethionine. 
MOD_RES   106   106        Phosphoserine. 
MOD_RES   112   112        Phosphoserine. 
MOD_RES   120   120        Phosphoserine. 
MOD_RES   123   123        Phosphoserine. 
MOD_RES   124   124        Phosphothreonine. 
MOD_RES   639   639        Phosphoserine. 
MOD_RES   676   676        Phosphoserine. 
MOD_RES   677   677        Phosphoserine. 
MOD_RES   679   679        Phosphoserine. 
MOD_RES   701   701        Phosphothreonine. 
CARBOHYD   111   111        O-linked (GlcNAc) (Probable). 
CARBOHYD   112   112        O-linked (GlcNAc); alternate (Probable). 
VARIANT   531   531  1     F -> Y (in strain: 776). 
VARIANT   549   549  1     A -> P (in strain: 776). 
VARIANT   552   552  1     Y -> P (in strain: 776). 
MUTAGEN   111   111        S->A: Decreases glycosylation level. 
MUTAGEN   112   112        S->A: Decreases glycosylation level. 
MUTAGEN   124   124        T->A: 200-fold reduction in phosphorylation by CDC2. No DNA replication activation. 
MUTAGEN   679   679        S->A: Enhanced DNA replication. 
HELIX   7    16  10      
HELIX   27    36  10      
TURN   37    40  4      
TURN   43    45  3      
TURN   48    52  5      
HELIX   53    67  15      
STRAND   87    89  3      
HELIX   91   102  12      
STRAND   136   138  3      
HELIX   140   145  6      
STRAND   156   163  8      
HELIX   165   178  14      
STRAND   182   189  8      
STRAND   192   203  12      
HELIX   205   215  11      
STRAND   221   227  7      
HELIX   229   236  8      
STRAND   242   248  7      
HELIX   251   254  4      
HELIX   270   280  11      
HELIX   285   293  9      
HELIX   303   306  4      
HELIX   311   314  4      
HELIX   317   327  11      
HELIX   333   354  22      
HELIX   357   375  19      
STRAND   377   379  3      
HELIX   384   394  11      
TURN   395   397  3      
HELIX   401   414  14      
STRAND   421   425  5      
HELIX   432   443  12      
STRAND   446   448  3      
TURN   454   456  3      
HELIX   457   461  5      
HELIX   462   464  3      
STRAND   470   472  3      
HELIX   481   483  3      
HELIX   490   494  5      
HELIX   498   502  5      
STRAND   507   509  3      
STRAND   512   514  3      
STRAND   517   519  3      
STRAND   524   528  5      
HELIX   535   538  4      
STRAND   542   546  5      
HELIX   551   558  8      
HELIX   562   565  4      
HELIX   572   582  11      
HELIX   585   587  3      
TURN   590   592  3      
HELIX   593   606  14      
HELIX   609   621  13      
Sequence information
Length: 708 AA [This is the length of the unprocessed precursor] Molecular weight: 81582 Da [This is the MW of the unprocessed precursor] CRC64: CB81306EF9E4E2C0 [This is a checksum on the sequence]
        10         20         30         40         50         60 
MDKVLNREES LQLMDLLGLE RSAWGNIPLM RKAYLKKCKE FHPDKGGDEE KMKKMNTLYK 

        70         80         90        100        110        120 
KMEDGVKYAH QPDFGGFWDA TEIPTYGTDE WEQWWNAFNE ENLFCSEEMP SSDDEATADS 

       130        140        150        160        170        180 
QHSTPPKKKR KVEDPKDFPS ELLSFLSHAV FSNRTLACFA IYTTKEKAAL LYKKIMEKYS 

       190        200        210        220        230        240 
VTFISRHNSY NHNILFFLTP HRHRVSAINN YAQKLCTFSF LICKGVNKEY LMYSALTRDP 

       250        260        270        280        290        300 
FSVIEESLPG GLKEHDFNPE EAEETKQVSW KLVTEYAMET KCDDVLLLLG MYLEFQYSFE 

       310        320        330        340        350        360 
MCLKCIKKEQ PSHYKYHEKH YANAAIFADS KNQKTICQQA VDTVLAKKRV DSLQLTREQM 

       370        380        390        400        410        420 
LTNRFNDLLD RMDIMFGSTG SADIEEWMAG VAWLHCLLPK MDSVVYDFLK CMVYNIPKKR 

       430        440        450        460        470        480 
YWLFKGPIDS GKTTLAAALL ELCGGKALNV NLPLDRLNFE LGVAIDQFLV VFEDVKGTGG 

       490        500        510        520        530        540 
ESRDLPSGQG INNLDNLRDY LDGSVKVNLE KKHLNKRTQI FPPGIVTMNE FSVPKTLQAR 

       550        560        570        580        590        600 
FVKQIDFRAK DYLKHCLERS EFLLEKRIIQ SGIALLLMLI WYRPVAEFAQ SIQSRIVEWK 

       610        620        630        640        650        660 
ERLDKEFSLS VYQKMKFNVA MGIGVLDWLR NSDDDDEDSQ ENADKNEDGG EKNMEDSGHE 

       670        680        690        700 
TGIDSQSQGS FQAPQSSQSV HDHNQPYHIC RGFTCFKKPP TPPPEPET 

P03070 in FASTA format

View entry in original UniProtKB/Swiss-Prot format
View entry in raw text format (no links)
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