Q66577 (POLG_EC09B) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names	Recommended name: Genome polyprotein Cleaved into the following 12 chains: Protein VP0 Alternative name(s): VP4-VP2 Protein VP4 Alternative name(s): P1A Virion protein 4 Protein VP2 Alternative name(s): P1B Virion protein 2 Protein VP3 Alternative name(s): P1C Virion protein 3 Protein VP1 Alternative name(s): P1D Virion protein 1 Picornain 2A Short name=P2A Short name=Protein 2A EC=3.4.22.29 Protein 2B Short name=P2B Protein 2C Short name=P2C EC=3.6.1.15 Protein 3A Short name=P3A Protein 3B Short name=P3B Alternative name(s): VPg Picornain 3C EC=3.4.22.28 Alternative name(s): Protease 3C Short name=P3C RNA-directed RNA polymerase 3D-POL Short name=P3D-POL EC=2.7.7.48
Organism	Echovirus 9 (strain Barty) [Complete proteome]
Taxonomic identifier	103914 [NCBI]
Taxonomic lineage	Viruses › ssRNA viruses › ssRNA positive-strand viruses, no DNA stage › Picornavirales › Picornaviridae › Enterovirus › Enterovirus B › Echo 9 virus
Virus host	Homo sapiens (Human) [TaxID: 9606]

Protein attributes

Sequence length	2203 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is further processed into a mature form.
Protein existence	Inferred from homology

General annotation (Comments)

Function	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. VP0 precursor is a component of immature procapsids By similarity. Protein 2A is a cysteine protease that is responsible for the cleavage between the P1 and P2 regions. It cleaves the host translation initiation factor EIF4G1, in order to shut down the capped cellular mRNA transcription 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. It also inhibits endoplasmic reticulum-to-Golgi transport By similarity. Protein 3C is a 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 co-operatively to the protease By similarity. RNA-directed RNA polymerase 3D-POL replicates genomic and antigenomic RNA by recognizing replications specific signals By similarity.
Catalytic activity	Nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1). Selective cleavage of Tyr-|-Gly bond in the picornavirus polyprotein. 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.
Subcellular location	Protein VP2: Virion. Host cytoplasm Potential. Protein VP3: Virion. Host cytoplasm Potential. Protein VP1: Virion. Host cytoplasm Potential. 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. Protein 3B: Virion Potential. Picornain 3C: Host cytoplasm Potential. 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.
Post-translational modification	Specific enzymatic cleavages in vivo by the viral proteases 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 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.
Sequence similarities	Belongs to the picornaviruses polyprotein family. Contains 2 peptidase C3 domains. Contains 1 RdRp catalytic domain. Contains 1 SF3 helicase domain.

Ontologies

Keywords
Biological process	Activation of host autophagy by virus Host-virus interaction Inhibition of host IFN-mediated response initiation by virus Inhibition of host RIG-I by virus Inhibition of host innate immune response by virus Ion transport Transport Viral RNA replication Viral attachment to host cell Viral immunoevasion Virus entry into host cell
Cellular component	Host cytoplasm Host cytoplasmic vesicle Host membrane Membrane Virion
Ligand	ATP-binding Nucleotide-binding RNA-binding
Molecular function	Capsid protein Helicase Hydrolase Ion channel Nucleotidyltransferase Protease RNA-directed RNA polymerase Thiol protease Transferase Viral ion channel
PTM	Covalent protein-RNA linkage Lipoprotein Myristate Phosphoprotein
Technical term	Complete proteome
Gene Ontology (GO)
Biological_process	RNA-protein covalent cross-linking Inferred from electronic annotation. Source: UniProtKB-KW induction by virus of host autophagy Inferred from electronic annotation. Source: UniProtKB-KW ion transport Inferred from electronic annotation. Source: UniProtKB-KW proteolysis Inferred from electronic annotation. Source: UniProtKB-KW suppression by virus of host RIG-I activity Inferred from electronic annotation. Source: UniProtKB-KW suppression by virus of host type I interferon production Inferred from electronic annotation. Source: UniProtKB-KW transcription, DNA-dependent Inferred from electronic annotation. Source: InterPro viral attachment to host cell Inferred from electronic annotation. Source: UniProtKB-KW viral entry into host cell Inferred from electronic annotation. Source: UniProtKB-KW viral genome replication Inferred from electronic annotation. Source: InterPro
Cellular_component	host cell cytoplasmic vesicle membrane Inferred from electronic annotation. Source: UniProtKB-SubCell membrane Inferred from electronic annotation. Source: UniProtKB-KW viral capsid Inferred from electronic annotation. Source: UniProtKB-KW
Molecular_function	ATP binding Inferred from electronic annotation. Source: UniProtKB-KW RNA binding Inferred from electronic annotation. Source: UniProtKB-KW RNA helicase activity Inferred from electronic annotation. Source: InterPro RNA-directed RNA polymerase activity Inferred from electronic annotation. Source: UniProtKB-KW cysteine-type endopeptidase activity Inferred from electronic annotation. Source: InterPro structural molecule activity Inferred from electronic annotation. Source: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Initiator methionine	1	1	Removed; by host By similarity
	Chain	2 – 330	329	Protein VP0 Potential		PRO_0000311056
	Chain	2 – 69	68	Protein VP4 Potential		PRO_0000039681
	Chain	70 – 330	261	Protein VP2 Potential		PRO_0000039682
	Chain	331 – 569	239	Protein VP3 Potential		PRO_0000039683
	Chain	570 – 869	300	Protein VP1 Potential		PRO_0000039684
	Chain	870 – 1019	150	Picornain 2A Potential		PRO_0000039685
	Chain	1020 – 1118	99	Protein 2B Potential		PRO_0000039686
	Chain	1119 – 1447	329	Protein 2C Potential		PRO_0000039687
	Chain	1448 – 1536	89	Protein 3A Potential		PRO_0000039688
	Chain	1537 – 1558	22	Protein 3B Potential		PRO_0000039689
	Chain	1559 – 1741	183	Picornain 3C Potential		PRO_0000039690
	Chain	1742 – 2203	462	RNA-directed RNA polymerase 3D-POL Potential		PRO_0000039691
Regions
	Topological domain	2 – 1513	1512	Cytoplasmic Potential
	Intramembrane	1514 – 1529	16	Potential
	Topological domain	1530 – 2203	674	Cytoplasmic Potential
	Domain	1223 – 1379	157	SF3 helicase
	Domain	1968 – 2084	117	RdRp catalytic
	Nucleotide binding	1247 – 1254	8	ATP Potential
Sites
	Active site	890	1	For picornain 2A activity By similarity
	Active site	908	1	For picornain 2A activity By similarity
	Active site	979	1	For picornain 2A activity By similarity
	Active site	1598	1	For picornain 3C activity Potential
	Active site	1629	1	For picornain 3C activity Potential
	Active site	1705	1	For picornain 3C activity By similarity
	Site	69 – 70	2	Cleavage Potential
	Site	330 – 331	2	Cleavage; by picornain 3C Potential
	Site	869 – 870	2	Cleavage; by picornain 2A Potential
	Site	1019 – 1020	2	Cleavage; by picornain 3C Potential
	Site	1118 – 1119	2	Cleavage; by picornain 3C Potential
	Site	1447 – 1448	2	Cleavage; by picornain 3C Potential
	Site	1536 – 1537	2	Cleavage; by picornain 3C Potential
	Site	1558 – 1559	2	Cleavage; by picornain 3C Potential
	Site	1741 – 1742	2	Cleavage; by picornain 3C Potential
Amino acid modifications
	Modified residue	1539	1	O-(5'-phospho-RNA)-tyrosine By similarity
	Lipidation	2	1	N-myristoyl glycine; by host By similarity

Sequences

	Sequence		Length	Mass (Da)
	Q66577 [UniParc]. Last modified January 23, 2007. Version 3. Checksum: 79B78F8C99D02777	FASTA	2,203	246,281
	10 20 30 40 50 60 MGAQVSTQKT GAHETGLNAS GNSIIHYTNI NYYKDSASNS ANRQDFTQDP SKFTEPVKDV 70 80 90 100 110 120 MIKTLPALNS PSAEECGFSD RVRSITIGNS TITTQECANV VVAYGRWPAY LRDDEATAED 130 140 150 160 170 180 QPTQPDVATC RFYTLESVQW QENSAGWWWK FPDALSNMGL FGQNMLYHYL GRSGYTIHVQ 190 200 210 220 230 240 CNASKFHQGR PIVVCVPEAE MGCSKVDGVV NAQGLSKGET PIEFERTSTT AEVGVVQKAV 250 260 270 280 290 300 YNAGMGVGVG NLTIFPHQWI NLRRNNSATI VIPYINCVPM DNMFRHNNFT LMVILFAPLK 310 320 330 340 350 360 SSGGTNYVSI TITVAPMDAE YNGLRLAGHQ GLPTMNTPGS TQFLTSDDFQ SPCAMPEFDV 370 380 390 400 410 420 TPCMDIPGEV HNLMEIAEVD SVVPVNNTST HMEGTDAFQI KVTAGNVQDK SAIFSFQLNP 430 440 450 460 470 480 GNSTVLRRTL LGEILNYYAH WSGSIKLTFL FCGSAMATGK LLLAYSHAGA SVPKSRRDAM 490 500 510 520 530 540 LGTHVIWDVG LQSSCVLCVP WISQTHYRLV AQDEYTSAGY ITCWYQTNIV VPPETPSDCV 550 560 570 580 590 600 VLCFVSACND FSVRMLKDTP FIEQAAELQN DVRQAVEGAI GRVADTIRSG PSNSEAVPAL 610 620 630 640 650 660 TAAETGHTSQ VVPSDTMQTR HVKNYHSRSE STIENFLCRS ACVRMAKYEA RGDPESTDRF 670 680 690 700 710 720 DAWEISVRDM VQMRRKCEMF TYLRFDVEVT FVITSYQHQG SINQDMPPMT HQIMYIPPGG 730 740 750 760 770 780 PFPKKVDGYE WQTSTNPSIF WTEGNAPPRM SIPFISIGNA YSSFYDGWSH FDSKGAYGFN 790 800 810 820 830 840 TLNKMGHIYC RHVNKETPAE VTSYIRIYFK PKHIRAWVPR PPRLCQYKNK ANVNFEATAF 850 860 870 880 890 900 TETRDTINTV PVSNHGSGRR GDLAALSTHG AFGQESGAVY VGNYRVLNRH LATHTDWQNC 910 920 930 940 950 960 IWEDYNRDLL VSTTTAHGCD TIARCQCKTG VFFCQSKNKH YPVSFEGPGL VEVQESEYYP 970 980 990 1000 1010 1020 KRYQSHVLLA AGFSEPGDCG GILRCDHGVI GLVTMGGEGV VGFADVRDLL WLEDDAMEQG 1030 1040 1050 1060 1070 1080 VKDYVEQLGN AFGSGFTNQI CEQVNLLKES LIGQDSVLEK SLKALVKIIS ALVIVVRNQD 1090 1100 1110 1120 1130 1140 DLITVTATLA LIGCTTSPWR WLKQKVSQYY GIPMAERQSN GWLKKFTEMT NACKGMEWIA 1150 1160 1170 1180 1190 1200 VKIQKFIEWL KVKNLPEVKE KHEFLNRLKQ LPLLESQIAT IEQSAPSQSD QEQLFSNVQY 1210 1220 1230 1240 1250 1260 FAHYCRKYAP LYAAEAKRVF SLEKKMSNYI QFKSKCRIEP VCLLLHGSPG AGKSVATNLI 1270 1280 1290 1300 1310 1320 GRSLAEKLNS SVYSLPPDPD HFDGYKQQAV VIMDDLCQNP DGKDVSLFCQ MVSSVDFVPP 1330 1340 1350 1360 1370 1380 MAALEEKGIL FTSPFVLAST NAGSINAPTV SDSRALARRF HFDMNIEVIS MYSQNGKINM 1390 1400 1410 1420 1430 1440 PMSVKTCDEE CCPVNFKRCC PLVCGKAIQF IDRRTQVRYS LDMLVTEMFR EYNHRHSVGA 1450 1460 1470 1480 1490 1500 TLEALFQGPP VYREIKISVA PETPPPPAIA DLLKSVDSEA VREYCKERGW LVPEINSTLQ 1510 1520 1530 1540 1550 1560 IEKHVSRAFI CLQALTTFVS VAGIIYIIYK LFAGFQGAYT GMPNKKPKVP TLRQAKVQGP 1570 1580 1590 1600 1610 1620 AFEFAVAMMK RNASTVKTEY GEFTMLGIYD RWAVLPRHAK PGSTILMNDQ EVCLLDAKEL 1630 1640 1650 1660 1670 1680 VDKDGINLEL TLLKLNRNEK FRDIRGFLAR EEVEVNEAVL AINTSKFPNM YIPVGQVTDY 1690 1700 1710 1720 1730 1740 GFLNLGGTPT KRMLMYNFPT RAGQCGGVLM STGKVLGIHV GGNGHQGFSA ALLRHYFNEE 1750 1760 1770 1780 1790 1800 QGEIEFIESS KDAGFPVINT PSKTKLEPSV FHQVFEGNKE PAVLRNGDPR LKADFEEAIF 1810 1820 1830 1840 1850 1860 SKYIGNVNTH VDEYMQEAVD HYAGQLATLD ISTEPMKLED AVYGTEGLEA LDLTTSAGYP 1870 1880 1890 1900 1910 1920 YVALGIKKRD ILSKRTKDLT KLKECMDKYG LNLPMVTYVK DELRSAEKSP RGKSRLIEAS 1930 1940 1950 1960 1970 1980 SLNDSVAMRQ TFGNLYKVFH LNPGIVTGSA VGCDPDVFWS KIPVMLDGHL IAFDYSGYDA 1990 2000 2010 2020 2030 2040 SLSPVWFACL KLLLEKLGYS SKETNYIDYL CNSHHLYRDK HYFVRGGMPS GCSGTSIFNS 2050 2060 2070 2080 2090 2100 MINNIIIRTL MLKVYKGIDL DQFRMIAYGD DVIASYPWPI DASLLAEAGK DYGLIMTPAD 2110 2120 2130 2140 2150 2160 KGECFNEVTW TNVTFLKRYF RADEQYPFLV HPVMPMKDIH ESIRWTKDPK NTQDHVRSLC 2170 2180 2190 2200 LLAWHNGEHE YEEFIHKIRS VPVGRCLTLP AFSTLRRKWL DSF

References

[1]	"Molecular cloning and sequence determination of the complete genome of the virulent echovirus 9 strain Barty." Zimmermann H., Eggers H.J., Nelsen-Salz B. Virus Genes 12:149-154(1996) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC RNA].

Cross-references

Sequence databases
EMBL GenBank DDBJ	X92886 Genomic RNA. Translation: CAA63480.1.
3D structure databases
ProteinModelPortal	Q66577.
SMR	Q66577. Positions 2-69, 77-569, 571-851, 870-1019, 1559-2203.
ModBase	Search...
Protein family/group databases
MEROPS	N08.001.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Family and domain databases
Gene3D	4.10.80.10. 2 hits.
InterPro	IPR003593. AAA+_ATPase. IPR000605. Helicase_SF3_ssDNA/RNA_vir. IPR014759. Helicase_SF3_ssRNA_vir. IPR014838. P3A. IPR000081. Peptidase_C3. IPR000199. Peptidase_C3A/C3B_picornavir. IPR003138. Pico_P1A. IPR002527. Pico_P2B. IPR001676. Picornavirus_capsid. IPR001205. RNA-dir_pol_C. IPR007094. RNA-dir_pol_PSvirus. IPR009003. Trypsin-like_Pept_dom. [Graphical view]
Pfam	PF08727. P3A. 1 hit. PF00548. Peptidase_C3. 1 hit. PF02226. Pico_P1A. 1 hit. PF00947. Pico_P2A. 1 hit. PF01552. Pico_P2B. 1 hit. PF00680. RdRP_1. 1 hit. PF00073. Rhv. 3 hits. PF00910. RNA_helicase. 1 hit. [Graphical view]
ProDom	PD001306. Peptidase_C3. 1 hit. PD649346. Pico_P2B. 1 hit. [Graphical view] [Entries sharing at least one domain]
SMART	SM00382. AAA. 1 hit. [Graphical view]
SUPFAM	SSF89043. P3A. 1 hit. SSF50494. Pept_Ser_Cys. 2 hits.
PROSITE	PS50507. RDRP_SSRNA_POS. 1 hit. PS51218. SF3_HELICASE_2. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

POLG_EC09B

Accession

Primary (citable) accession number: Q66577

Entry history

Integrated into UniProtKB/Swiss-Prot:	July 15, 1999
Last sequence update:	January 23, 2007
Last modified:	May 1, 2013
This is version 117 of the entry and version 3 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Viral Protein Annotation Program