P08545 (POLG_TMEVG) Reviewed, UniProtKB/Swiss-Prot
Last modified December 11, 2013. Version 122. History...
Names and origin
|Protein names||Recommended name:|
Cleaved into the following 13 chains:
|Organism||Theiler's murine encephalomyelitis virus (strain GDVII) (TMEV) [Complete proteome]|
|Taxonomic identifier||12127 [NCBI]|
|Taxonomic lineage||Viruses › ssRNA positive-strand viruses, no DNA stage › Picornavirales › Picornaviridae › Cardiovirus ›|
|Virus host||Mus musculus (Mouse) [TaxID: 10090]|
|Sequence length||2303 AA.|
|Sequence processing||The displayed sequence is further processed into a mature form.|
|Protein existence||Inferred from homology|
General annotation (Comments)
Leader protein: promotes host NUP98 phosphorylation and blocks the export of host mRNA from the nucleus. The resulting inhibition of cellular protein synthesis serves to ensure maximal viral gene expression and to evade host immune response. The leader protein also inhibit host interferon regulatory factor 3 (IRF3) dimerization, thereby blocking the transcriptional activation of IFN genes By similarity.
Capsid proteins VP1, VP2, VP3 and VP4 form a closed capsid enclosing the viral positive strand RNA genome. VP4 lies on the inner surface of the protein shell formed by VP1, VP2 and VP3. All the three latter proteins contain a beta-sheet structure called beta-barrel jelly roll. Together they form an icosahedral capsid (T=3) composed of 60 copies of each VP1, VP2, and VP3, with a diameter of approximately 300 Angstroms. VP1 is situated at the 12 fivefold axes, whereas VP2 and VP3 are located at the quasi-sixfold axes By similarity.
Protein VP0: VP0 precursor is a component of immature procapsids By similarity.
Protein 2B: Affects membrane integrity and cause an increase in membrane permeability By similarity.
Protein 2C: Associates with and induces structural rearrangements of intracellular membranes. It displays RNA-binding, nucleotide binding and NTPase activities By similarity.
Protein 3A, via its hydrophobic domain, serves as membrane anchor By similarity.
Protease 3C: cysteine protease that generates mature viral proteins from the precursor polyprotein. In addition to its proteolytic activity, it binds to viral RNA, and thus influences viral genome replication. RNA and substrate bind cooperatively to the protease By similarity.
RNA-directed RNA polymerase 3D-POL replicates genomic and antigenomic RNA by recognizing replications specific signals By similarity.
Protein 2A: is involved in host translation shutoff. Nuclear localization is required for this function By similarity.
Nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1).
Selective cleavage of Gln-|-Gly bond in the poliovirus polyprotein. In other picornavirus reactions Glu may be substituted for Gln, and Ser or Thr for Gly.
NTP + H2O = NDP + phosphate.
Protein 2B: Host cytoplasmic vesicle membrane; Peripheral membrane protein; Cytoplasmic side Potential. Note: Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are derived from the endoplasmic reticulum By similarity.
Protein 2C: Host cytoplasmic vesicle membrane; Peripheral membrane protein; Cytoplasmic side Potential. Note: Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are derived from the endoplasmic reticulum By similarity.
Protein 3A: Host cytoplasmic vesicle membrane; Peripheral membrane protein; Cytoplasmic side Potential. Note: Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are derived from the endoplasmic reticulum By similarity.
RNA-directed RNA polymerase 3D-POL: Host cytoplasmic vesicle membrane; Peripheral membrane protein; Cytoplasmic side Potential. Note: Probably localizes to the surface of intracellular membrane vesicles that are induced after virus infection as the site for viral RNA replication. These vesicles are derived from the endoplasmic reticulum By similarity.
The Theilo and zinc-finger regions may both play a role in the inhibition of host mRNA export and IRF-3 dimerization antagonism by the L protein By similarity.
Specific enzymatic cleavages by the viral protease in vivo yield a variety of precursors and mature proteins. Polyprotein processing intermediates such as VP0 which is a VP4-VP2 precursor are produced. During virion maturation, non-infectious particles are rendered infectious following cleavage of VP0. This maturation cleavage is followed by a conformational change of the particle. The polyprotein seems to be cotranslationally cleaved at the 2A/2B junction by a ribosomal skip from one codon to the next without formation of a peptide bond. This process would release the L-P1-2A peptide from the translational complex By similarity.
VPg is uridylylated by the polymerase and is covalently linked to the 5'-end of genomic RNA. This uridylylated form acts as a nucleotide-peptide primer for the polymerase By similarity.
Myristoylation of VP4 is required during RNA encapsidation and formation of the mature virus particle By similarity.
Persistent strains of Theiler's virus (e.g. DA, TO, BeAn) cause persistent demyelinating disease whereas neurovirulent strains (such as GDVII) cause acute encephalitis.
Belongs to the picornaviruses polyprotein family.
Contains 2 peptidase C3 domains.
Contains 1 RdRp catalytic domain.
Contains 1 SF3 helicase domain.
Sequence annotation (Features)
|Feature key||Position(s)||Length||Description||Graphical view||Feature identifier|
|Chain||1 – 76||76||Leader protein||PRO_0000040192|
|Chain||77 – 414||338||Protein VP0 Potential||PRO_0000310972|
|Chain||77 – 147||71||Protein VP4 Potential||PRO_0000040193|
|Chain||148 – 414||267||Protein VP2 Potential||PRO_0000040194|
|Chain||415 – 646||232||Protein VP3 Potential||PRO_0000040195|
|Chain||647 – 922||276||Protein VP1 Potential||PRO_0000040196|
|Chain||923 – 1055||133||Protein 2A Potential||PRO_0000040197|
|Chain||1056 – 1191||136||Protein 2B Potential||PRO_0000040198|
|Chain||1192 – 1517||326||Protein 2C Potential||PRO_0000040199|
|Chain||1518 – 1605||88||Protein 3A Potential||PRO_0000040200|
|Chain||1606 – 1625||20||Protein 3B Potential||PRO_0000040201|
|Chain||1626 – 1842||217||Protease 3C Potential||PRO_0000040202|
|Chain||1843 – 2303||461||RNA-directed RNA polymerase 3D-POL Potential||PRO_0000040203|
|Topological domain||1 – 1562||1562||Cytoplasmic Potential|
|Intramembrane||1563 – 1581||19||Potential|
|Topological domain||1582 – 2303||722||Cytoplasmic Potential|
|Domain||1283 – 1448||166||SF3 helicase|
|Domain||2071 – 2189||119||RdRp catalytic|
|Zinc finger||3 – 14||12||Potential|
|Nucleotide binding||1312 – 1319||8||ATP Potential|
|Region||30 – 46||17||Acidic|
|Region||60 – 73||14||Theilo By similarity|
|Active site||1680||1||For protease 3C activity Potential|
|Active site||1712||1||For protease 3C activity Potential|
|Active site||1793||1||For protease 3C activity Potential|
|Site||147 – 148||2||Cleavage Potential|
|Site||414 – 415||2||Cleavage; by protease 3C Potential|
|Site||646 – 647||2||Cleavage; by protease 3C Potential|
|Site||922 – 923||2||Cleavage; by protease 3C Potential|
|Site||1055 – 1056||2||Cleavage; by ribosomal skip Potential|
|Site||1191 – 1192||2||Cleavage; by protease 3C Potential|
|Site||1517 – 1518||2||Cleavage; by protease 3C Potential|
|Site||1605 – 1606||2||Cleavage; by protease 3C Potential|
|Site||1625 – 1626||2||Cleavage; by protease 3C Potential|
|Site||1842 – 1843||2||Cleavage; by protease 3C Potential|
Amino acid modifications
|Modified residue||1608||1||O-(5'-phospho-RNA)-tyrosine By similarity|
|Lipidation||77||1||N-myristoyl glycine; by host By similarity|
|Sequence conflict||1747 – 1750||4||VTGI → CYRD in AAA47933. Ref.2|
|Sequence conflict||1992 – 2000||9||DDVVYQSFL → GRRCLPIIF in AAA47933. Ref.2|
|Sequence conflict||2003||1||E → Q Ref.2|
|Sequence conflict||2008||1||E → H in AAA47933. Ref.2|
|Sequence conflict||2046||1||F → L in AAA47933. Ref.2|
|Sequence conflict||2128 – 2134||7||LIRGGLP → YSWGPA in AAA47933. Ref.2|
|||"Insights into Theiler's virus neurovirulence based on a genomic comparison of the neurovirulent GDVII and less virulent BeAn strains."|
Pevear D.C., Borkowski J., Calenoff M., Oh C.K., Ostrawski B., Lipton H.L.
Virology 165:1-12(1988) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC RNA].
|||"Theiler's virus genome is closely related to that of encephalomyocarditis virus, the prototype cardiovirus."|
Ozden S., Tangy F., Chamorro M., Brahic M.
J. Virol. 60:1163-1165(1986) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [GENOMIC RNA] OF 1704-2303.
|M20562 Genomic RNA. Translation: AAA47929.1.|
M14703 Genomic RNA. Translation: AAA47933.1.
3D structure databases
|SMR||P08545. Positions 85-146, 148-922. |
Protein family/group databases
Protocols and materials databases
Family and domain databases
|Gene3D||126.96.36.199. 1 hit. |
|InterPro||IPR015031. Capsid_VP4_Picornavir. |
|Pfam||PF00548. Peptidase_C3. 1 hit. |
PF00680. RdRP_1. 1 hit.
PF00073. Rhv. 2 hits.
PF00910. RNA_helicase. 1 hit.
PF08935. VP4_2. 1 hit.
|PRINTS||PR00918. CALICVIRUSNS. |
|ProDom||PD649346. Pico_P2B. 1 hit. |
[Graphical view] [Entries sharing at least one domain]
|SUPFAM||SSF50494. SSF50494. 1 hit. |
|PROSITE||PS50507. RDRP_SSRNA_POS. 1 hit. |
PS51218. SF3_HELICASE_2. 1 hit.
|Accession||Primary (citable) accession number: P08545|
Secondary accession number(s): Q88593, Q88594
|Entry status||Reviewed (UniProtKB/Swiss-Prot)|
|Annotation program||Viral Protein Annotation Program|