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Annotation rule MF_04135
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General rule information [?]

Accession MF_04135
Dates 11-JAN-2019 (Created)
20-NOV-2019 (Last updated, Version 3)
Viruses; Caudovirales
Template P03710 (PORTL_LAMBD)

Propagated annotation [?]

Identifier, protein and gene names [?]

case <OC:Lambdavirus>
Protein name
RecName: Full=Portal protein B;
AltName: Full=GpB;
AltName: Full=Minor capsid protein B;
Protein name
RecName: Full=Portal protein;
end case
case <FTTag:cleavage>
Protein name
RecName: Full=Protein B*;
end case
case <OC:Lambdavirus>
Gene name
end case

Comments [?]

Function Forms the portal vertex of the capsid. This portal plays critical roles in head assembly, genome packaging, neck/tail attachment, and genome ejection. The portal protein multimerizes as a single ring-shaped homododecamer arranged around a central channel. Binds to the terminase subunits to form the packaging machine.
Subunit Homododecamer. Interacts with the terminase complex composed of two small and one large terminase subunits.
Subcellular location Virion.
Ptm Proteolytically cleaved by the viral protease during capsid maturation.
Similarity Belongs to the siphoviridae portal protein family.

Keywords [?]

case <OC:Siphoviridae>
end case
case <OC:Myoviridae>
end case
case <OC:Podoviridae>
end case

Gene Ontology [?]

GO:0046798; Cellular component: viral portal complex.
GO:0005198; Molecular function: structural molecule activity.
case <OC:Siphoviridae>
GO:0099001; Biological process: viral genome ejection through host cell envelope, long flexible tail mechanism.
end case
GO:0019068; Biological process: virion assembly.

Cross-references [?]

Pfam PF05136; Phage_portal_2; 1;
TIGRFAMs TIGR01539; portal_lambda; 1;

Computed features [?]

General Coiled_coil; -; 0-unlimited; trigger=yes;

Features [?]

case <OC:Lambdavirus>
From: PORTL_LAMBD (P03710)
Key     From     To       Description   Tag   Condition   FTGroup
CHAIN     Nter     Cter       Portal protein B        
CHAIN     Nter     Cter       Portal protein        
end case
SITE     22     23       Cleavage; by viral protease   cleavage   [GA]-G  
case <FTTag:cleavage>
CHAIN     23     Cter       Protein B*        
end case

Additional information [?]

Size range 490-590 amino acids
Related rules None
Fusion None