ID   VE2_HPV55               Reviewed;         378 AA.
AC   Q80937;
DT   15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   02-JUN-2021, entry version 101.
DE   RecName: Full=Regulatory protein E2 {ECO:0000255|HAMAP-Rule:MF_04001};
GN   Name=E2 {ECO:0000255|HAMAP-Rule:MF_04001};
OS   Human papillomavirus type 55.
OC   Viruses; Monodnaviria; Shotokuvirae; Cossaviricota; Papovaviricetes;
OC   Zurhausenvirales; Papillomaviridae; Firstpapillomavirinae;
OC   Alphapapillomavirus.
OX   NCBI_TaxID=37114;
OH   NCBI_TaxID=9606; Homo sapiens (Human).
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Delius H.;
RL   Submitted (OCT-1995) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Plays a role in the initiation of viral DNA replication. A
CC       dimer of E2 interacts with a dimer of E1 in order to improve
CC       specificity of E1 DNA binding activity. Once the complex recognizes and
CC       binds DNA at specific sites, the E2 dimer is removed from DNA. E2 also
CC       regulates viral transcription through binding to the E2RE response
CC       element (5'-ACCNNNNNNGGT-3') present in multiple copies in the
CC       regulatory regions of the viral genome. Activates or represses
CC       transcription depending on E2RE's position with regards to proximal
CC       promoter elements including the TATA-box. Repression occurs by
CC       sterically hindering the assembly of the transcription initiation
CC       complex. {ECO:0000255|HAMAP-Rule:MF_04001}.
CC   -!- SUBUNIT: Binds DNA as homodimer. Interacts with protein E1; this
CC       interaction greatly increases E1 DNA-binding activity. Interacts with
CC       protein L1; this interaction enhances E2-dependent replication and
CC       transcription activation. Interacts with protein L2; this interaction
CC       inhibits E2 transcriptional activity but not DNA replication function
CC       E2. Interacts with protein E7; this interaction inhibits E7 oncogenic
CC       activity. Interacts with host TAF1; this interaction modulates E2-
CC       dependent transcriptional regulation. Interacts with host BRD4; this
CC       interaction mediates E2 transcriptional activation function.
CC       Additionally, the interaction with host BRD4 on mitotic chromosomes
CC       mediates tethering of the viral genome. Interacts with host TOPBP1;
CC       this interaction is required for optimal viral DNA replication.
CC       {ECO:0000255|HAMAP-Rule:MF_04001}.
CC   -!- SUBCELLULAR LOCATION: Host nucleus {ECO:0000255|HAMAP-Rule:MF_04001}.
CC   -!- PTM: Phosphorylated. {ECO:0000255|HAMAP-Rule:MF_04001}.
CC   -!- SIMILARITY: Belongs to the papillomaviridae E2 protein family.
CC       {ECO:0000255|HAMAP-Rule:MF_04001}.
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DR   EMBL; U31791; AAA79481.1; -; Genomic_DNA.
DR   SMR; Q80937; -.
DR   Proteomes; UP000152738; Genome.
DR   GO; GO:0042025; C:host cell nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0003700; F:DNA-binding transcription factor activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000166; F:nucleotide binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0006260; P:DNA replication; IEA:UniProtKB-KW.
DR   GO; GO:0006275; P:regulation of DNA replication; IEA:UniProtKB-UniRule.
DR   GO; GO:0006351; P:transcription, DNA-templated; IEA:UniProtKB-UniRule.
DR   GO; GO:0039693; P:viral DNA genome replication; IEA:UniProtKB-UniRule.
DR   Gene3D; 1.10.287.30; -; 1.
DR   Gene3D; 2.170.200.10; -; 1.
DR   Gene3D; 3.30.70.330; -; 1.
DR   HAMAP; MF_04001; PPV_E2; 1.
DR   InterPro; IPR035975; E2/EBNA1_C_sf.
DR   InterPro; IPR012677; Nucleotide-bd_a/b_plait_sf.
DR   InterPro; IPR000427; Papillomavirus_E2_C.
DR   InterPro; IPR001866; Papillomavirus_E2_N.
DR   InterPro; IPR033668; Reg_prot_E2.
DR   InterPro; IPR036050; Regulatory_protein_E2_N.
DR   InterPro; IPR042503; Regulatory_protein_E2_N_1.
DR   InterPro; IPR042504; Regulatory_protein_E2_N_2.
DR   Pfam; PF00511; PPV_E2_C; 1.
DR   Pfam; PF00508; PPV_E2_N; 1.
DR   SUPFAM; SSF51332; SSF51332; 1.
DR   SUPFAM; SSF54957; SSF54957; 1.
PE   3: Inferred from homology;
KW   Activator; DNA replication; DNA-binding; Early protein; Host nucleus;
KW   Phosphoprotein; Repressor; Transcription; Transcription regulation.
FT   CHAIN           1..378
FT                   /note="Regulatory protein E2"
FT                   /id="PRO_0000133233"
FT   REGION          1..200
FT                   /note="Transactivation domain"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04001"
FT   REGION          209..282
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          295..378
FT                   /note="DNA-binding domain"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_04001"
FT   COMPBIAS        209..232
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        249..282
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   378 AA;  42900 MW;  E6AA84149ECAD654 CRC64;
     METIAKHLDV CQEQLLELYE ENSNNLTKHI QHWKCIRYEC VLLHKAKQMG LNHIGMQVVP
     ALTVSQTKGH QAIEMQMTLE TLLNSDYGME PWTLQDTSRE MWLTAPKYCF KKQGQTVEVK
     YDCNADNIME YVSWKYIYVH DTDKWVKVTG HIDYKGLYYV HGGHKTYYTN FEKEAKKYGN
     SLQWEVCIGS SVICSPASIS STVQDVSIAG PASHTSSSTT TTLAQASPAL PTCTSEERVD
     PPPCKRPRGP TTNTNNARDT VSVRHSDSVD STNNNIYPNS YNSNKGRDNN FCTATPVVQL
     QGDPNCLKCL RYRLHAKHKT LFVAASSTWR WTCSDTSSKH ALVTLTYVNE EQREQFLNTV
     RLPPTVTYKV GYMSLQLL