ID PPR_EHV2 Reviewed; 643 AA. AC P52369; DT 01-OCT-1996, integrated into UniProtKB/Swiss-Prot. DT 01-OCT-1996, sequence version 1. DT 03-NOV-2009, entry version 57. DE RecName: Full=Protease precursor; DE Short=pPR; DE AltName: Full=Capsid protein P40; DE Contains: DE RecName: Full=Assemblin; DE EC=3.4.21.97; DE AltName: Full=Protease; DE Contains: DE RecName: Full=Assembly protein; DE AltName: Full=Capsid assembly protein; GN ORFNames=17; OS Equine herpesvirus 2 (strain 86/87) (EHV-2). OC Viruses; dsDNA viruses, no RNA stage; Herpesvirales; Herpesviridae; OC Gammaherpesvirinae; Percavirus. OX NCBI_TaxID=82831; OH NCBI_TaxID=9796; Equus caballus (Horse). RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RX MEDLINE=95302501; PubMed=7783207; DOI=10.1006/jmbi.1995.0314; RA Telford E.A.R., Watson M.S., Aird H.C., Perry J., Davison A.J.; RT "The DNA sequence of equine herpesvirus 2."; RL J. Mol. Biol. 249:520-528(1995). CC -!- FUNCTION: Protease precursor plays a major role in capsid CC assembly. Acts as a scaffold protein by binding major capsid CC protein (MCP) in the cytoplasm, inducing the nuclear localization CC of both proteins. Multimerizes in the nucleus such as MCP forms CC the icosahedral T=16 capsid. Autocatalytic cleavage releases the CC assembly protein, and subsequently abolishes interaction with CC major capsid protein. Cleavages products are evicted from the CC capsid before or during DNA packaging (By similarity). CC -!- FUNCTION: Assemblin is a protease essential for virion assembly in CC the nucleus. Catalyzes the cleavage of the assembly protein after CC complete capsid formation. Assemblin and cleavages products are CC evicted from the capsid before or during DNA packaging (By CC similarity). CC -!- FUNCTION: Assembly protein plays a major role in capsid assembly. CC Acts as a scaffold protein by binding major capsid protein. CC Multimerizes in the nucleus such as MCP forms the icosahedral T=16 CC capsid. Cleaved by assemblin after capsid completion. The CC cleavages products are evicted from the capsid before or during CC DNA packaging (By similarity). CC -!- CATALYTIC ACTIVITY: Cleaves -Ala-|-Ser- and -Ala-|-Ala- bonds in CC the scaffold protein. CC -!- SUBUNIT: Protease precursor homomultimerizes and interacts with CC major capsid protein. Assemblin exists in a monomer-dimer CC equilibrium with the dimer being the active species. Assembly CC protein homomultimerizes and interacts with major capsid protein CC (By similarity). CC -!- SUBCELLULAR LOCATION: Protease precursor: Host cytoplasm (By CC similarity). CC -!- SUBCELLULAR LOCATION: Assemblin: Host nucleus (By similarity). CC -!- SUBCELLULAR LOCATION: Assembly protein: Host nucleus (By CC similarity). CC -!- ALTERNATIVE PRODUCTS: CC Event=Alternative promoter usage; Named isoforms=2; CC Name=Protease precursor; Synonyms=pPR; CC IsoId=P52369-1; Sequence=Displayed; CC Name=pAP; Synonyms=Assembly protein; CC IsoId=P52369-2; Sequence=VSP_037417; CC -!- DOMAIN: Region of interaction between pPR and pAP is called Amino CC conserved domain (ACD). The region of interaction with major CC capsid protein is called carboxyl conserved domain (CCD) (By CC similarity). CC -!- PTM: Protease precursor is cleaved by assemblin after completion CC of icosahedral capsid formation. Cleavages occur at two or more CC sites: release and tail site (By similarity). CC -!- SIMILARITY: Belongs to the peptidase S21 family. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; U20824; AAC13804.1; -; Genomic_DNA. DR PIR; S55610; S55610. DR RefSeq; NP_042612.1; -. DR HSSP; P03234; 1O6E. DR MEROPS; S21.006; -. DR GeneID; 1461012; -. DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-KW. DR GO; GO:0005634; C:nucleus; IEA:UniProtKB-KW. DR GO; GO:0004252; F:serine-type endopeptidase activity; IEA:InterPro. DR GO; GO:0006508; P:proteolysis; IEA:InterPro. DR GO; GO:0019069; P:viral capsid assembly; IEA:UniProtKB-KW. DR InterPro; IPR001847; Peptidase_S21. DR Gene3D; G3DSA:3.20.16.10; Peptidase_S21; 1. DR Pfam; PF00716; Peptidase_S21; 1. DR PRINTS; PR00236; HSVCAPSIDP40. PE 3: Inferred from homology; KW Alternative promoter usage; Capsid assembly; Host cytoplasm; KW Host nucleus; Hydrolase; Protease; Serine protease. FT CHAIN 1 643 Protease precursor. FT /FTId=PRO_0000376800. FT CHAIN 1 269 Assemblin. FT /FTId=PRO_0000027263. FT CHAIN 270 643 Assembly protein. FT /FTId=PRO_0000027264. FT REGION 324 343 Interaction with pAP. FT REGION 623 643 Interaction with major capsid protein. FT MOTIF 439 445 Nuclear localization signal (Potential). FT ACT_SITE 82 82 Charge relay system (By similarity). FT ACT_SITE 151 151 Charge relay system (By similarity). FT ACT_SITE 173 173 Charge relay system (By similarity). FT SITE 269 270 Cleavage; by assemblin; Release site (By FT similarity). FT SITE 621 622 Cleavage; by assemblin; Tail site (By FT similarity). FT VAR_SEQ 1 307 Missing (in isoform pAP). FT /FTId=VSP_037417. SQ SEQUENCE 643 AA; 68394 MW; 1108A7A40E9FCA38 CRC64; MSSPSPSSSS SDHPSSPAPV PAPPGPVPEA AAASRASRAP VYLGGFVDVF SYPKDSRALY LNPADVGAHL PLPGPIPLNV EHLQEAHVGW TLGLHLTRYG LFCVAVITAE EFFTLLDRLC AASSVARTRA DHHLPPNPTL EMLHTWLPEL SLSSIHPDAL PGAKGGDTPI FQHVALCAMG QRRGTVAVYG ESLDWILSKF TSLSPEERGA IAEGYASPAP ESLPEPHFTC SNEILMAKAI DAGFIKNRLE ILKTDKGVAE VKAPTYLKAS VQGLPANLDE VDSARGGEDP PTAAIATTPH PATDATTMNQ QQPFAAQAPA GGCEDLISVP RSTFMTMLQT NLDTMRQTSL GQRFGQPIDA PAAPPAQLRV PPPAAPFPVH PGYYPAPYHP QVDAQAQYLP YVPLPPPGAM PFAPPPLPDF YKYGGIPAPG YSPVAHPARP GKRKRDCDEE FEGPLFPGEI HKDVQSLSKS IAALQSELKD IKNSQQFPQP LPQPQLQPQA QPQPQPAPQL YPAPPQAFYH PAAGDQGYYV RYLNPFQASG GVPCAPGPQG VGEPQAPQVT VTHNGHQAAP QAGGGATGAT AANVEQRQPE GGEACGAQQQ QPPQPQPQQQ QQPQQQAFVE ASTKPSQISQ LQKIFCEELL NKT //