X2FL43 · X2FL43_CHV16

Function

function

Assemblin: Protease that plays an essential role in virion assembly within the nucleus. Catalyzes the cleavage of the assembly protein after formation of the spherical procapsid. By that cleavage, the capsid matures and gains its icosahedral shape. The cleavage sites seem to include -Ala-Ser-, -Ala-Ala-, as well as Ala-Thr bonds. Assemblin and cleavages products are evicted from the capsid before or during DNA packaging.
Assembly protein: Plays a major role in capsid assembly. Acts as a scaffold protein by binding major capsid protein. Multimerizes in the nucleus such as major capsid protein forms the icosahedral T=16 capsid. Cleaved by assemblin after capsid completion. The cleavages products are evicted from the capsid before or during DNA packaging.
Capsid scaffolding protein: Acts as a scaffold protein by binding major capsid protein in the cytoplasm, inducing the nuclear localization of both proteins. Multimerizes in the nucleus such as major capsid protein forms the icosahedral T=16 capsid. Autocatalytic cleavage releases the assembly protein, and subsequently abolishes interaction with major capsid protein. Cleavages products are evicted from the capsid before or during DNA packaging.

Caution

Lacks conserved residue(s) required for the propagation of feature annotation.

Catalytic activity

  • Cleaves -Ala-|-Ser- and -Ala-|-Ala- bonds in the scaffold protein.
    EC:3.4.21.97 (UniProtKB | ENZYME | Rhea)

Features

Showing features for active site, site.

TypeIDPosition(s)Description
Active site58Charge relay system
Active site126Charge relay system
Active site145Charge relay system
Site244-245Cleavage; by assemblin; Release site
Site591-592Cleavage; by assemblin; Tail site

GO annotations

AspectTerm
Cellular Componenthost cell cytoplasm
Cellular Componenthost cell nucleus
Molecular Functionidentical protein binding
Molecular Functionserine-type endopeptidase activity
Biological Processnuclear capsid assembly
Biological Processproteolysis
Biological Processviral release from host cell

Keywords

Names & Taxonomy

Protein names

  • Recommended name
    Capsid scaffolding protein
  • Alternative names
    • Protease precursor
      (pPR
      )
  • Cleaved into 2 chains
    • Assemblin
      (EC:3.4.21.97 (UniProtKB | ENZYME | Rhea)
      ) Alternative names: Protease
      (Pr
      )
    • Assembly protein
      (AP
      ) Alternative names: Capsid assembly protein

Gene names

    • Name
      UL26

Organism names

Accessions

  • Primary accession
    X2FL43

Proteomes

Subcellular Location

Capsid scaffolding protein

Host cytoplasm

Assembly protein

Host nucleus

Assemblin

Host nucleus

Keywords

PTM/Processing

Features

Showing features for chain.

TypeIDPosition(s)Description
ChainPRO_50232617621-244Assemblin
ChainPRO_50232617641-616Capsid scaffolding protein
ChainPRO_5023261763245-616Assembly protein

Post-translational modification

Capsid scaffolding protein: Capsid scaffolding protein is cleaved by assemblin after formation of the spherical procapsid. As a result, the capsid obtains its mature, icosahedral shape. Cleavages occur at two or more sites: release (R-site) and maturation (M-site).

Keywords

Interaction

Subunit

Assemblin

Exists in a monomer-dimer equilibrium with the dimer being the active species.

Assembly protein

Homomultimer. Interacts with major capsid protein.

Capsid scaffolding protein

Homomultimer. Interacts with major capsid protein.

Family & Domains

Features

Showing features for region, compositional bias.

TypeIDPosition(s)Description
Region248-315Disordered
Compositional bias259-284Basic and acidic residues
Region394-451Disordered
Compositional bias401-426Basic and acidic residues
Region490-554Disordered
Compositional bias524-549Pro residues
Region596-616Interaction with major capsid protein

Domain

Region of interaction between pPR and pAP is called Amino conserved domain (ACD). The region of interaction with major capsid protein is called carboxyl conserved domain (CCD).

Sequence similarities

Belongs to the herpesviridae capsid scaffolding protein family.

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    616
  • Mass (Da)
    63,360
  • Last updated
    2014-06-11 v1
  • Checksum
    7D4B74F86E0BDDE0
MDPADGPDGSDSDRPVPIYVAGYLALYGSGDAGELALDPETVAAALPPAGPLAINVDHRARCEVGRVLAVVADPRGPFFAGLIACAQLERVLEAAASAAIFERRGPPLSREERLLYLVTNYLPSVSLSTRRLEEGEAPDNTLLAHVALCAIGRRLGTIVTYDTSLDAAVAPFRHLAADSREILRREAAEAELGLGGRVWAPGAEALTRALLSTAVNNMMLRDRWSLVAERRRQAGIAGHTYLQASEKFGLWGAGPGDPRPDRGYKRRSPGATDPGPDESDGAPRARDLPSAAPERPEADMNPAAPGAAAPTPAPPGDGSYLWIPAAHYNQLVASHPPGPAFGAPAAYAPLAGVVGAPAAFAPPHPGGVYHPGVLFPGPSPLEAQIAALVGAIAADRQPPPVAPGKRRRYETERECDHDDRDDAAYYPGEARAPPRFAPDSAGRARRAAPTPGANETIAALVGAVTSLQQELSHMRARAAPYGPPYAPAAPRPALGAAGDAPPPQYAQQAQWEAPTAVGAHAPALPHHPPQPQPPTRLQPYAPPTGAPLASGPQPVAVASGASGAVSGIAAAGAASPAEAGDPEAHAALVNASAATHVDVDVGRAADLFVSQMMGGR

Features

Showing features for compositional bias.

TypeIDPosition(s)Description
Compositional bias259-284Basic and acidic residues
Compositional bias401-426Basic and acidic residues
Compositional bias524-549Pro residues

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
KF908242
EMBL· GenBank· DDBJ
AHM96220.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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