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Annotation rule MF_04131
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General rule information [?]

Accession MF_04131
Dates 28-MAR-2018 (Created)
20-NOV-2019 (Last updated, Version 3)
Name Rota_VP7_A
Scope
Viruses; Rotavirus
Templates A2T3P5 (VP7_ROTSH); P12476 (VP7_ROTRH); Q86515 (VP7_ROTRF); P03533 (VP7_ROTS1): [Recover all]

Propagated annotation [?]


Identifier, protein and gene names [?]

Identifier
VP7
Protein name
RecName: Full=Outer capsid glycoprotein VP7;
Flags: Precursor;

Comments [?]

Function Calcium-binding protein that interacts with rotavirus cell receptors once the initial attachment by VP4 has been achieved. Rotavirus attachment and entry into the host cell probably involves multiple sequential contacts between the outer capsid proteins VP4 and VP7, and the cell receptors. Following entry into the host cell, low intracellular or intravesicular Ca(2+) concentration probably causes the calcium-stabilized VP7 trimers to dissociate from the virion. This step is probably necessary for the membrane-disrupting entry step and the release of VP4, which is locked onto the virion by VP7.
Subunit Homotrimer; disulfide-linked. 2 Ca(2+) ions bound at each subunit interface in the trimer hold the trimer together. Interacts with the intermediate capsid protein VP6. Interacts with the outer capsid protein VP5*.
Subcellular location Virion. Host endoplasmic reticulum lumen. Note=The outer layer contains 780 copies of VP7, grouped as 260 trimers. Immature double-layered particles assembled in the cytoplasm bud across the membrane of the endoplasmic reticulum, acquiring during this process a transient lipid membrane that is modified with the ER resident viral glycoproteins NSP4 and VP7; these enveloped particles also contain VP4. As the particles move towards the interior of the ER cisternae, the transient lipid membrane and the non-structural protein NSP4 are lost, while the virus surface proteins VP4 and VP7 rearrange to form the outermost virus protein layer, yielding mature infectious triple-layered particles.
Ptm N-glycosylated.
The N-terminus is blocked possibly by pyroglutamic acid.
Miscellaneous Some rotavirus strains are neuraminidase-sensitive and require sialic acid to attach to the cell surface. Some rotavirus strains are integrin-dependent. Some rotavirus strains depend on ganglioside for their entry into the host cell. Hsp70 also seems to be involved in the entry of some strains.
In group A rotaviruses, VP7 defines the G serotype.
Similarity Belongs to the rotavirus VP7 family.

Keywords [?]


Gene Ontology [?]

GO:0044166; Cellular component: host cell endoplasmic reticulum lumen.
GO:0039621; Cellular component: T=13 icosahedral viral capsid.
GO:0039624; Cellular component: viral outer capsid.

Cross-references [?]

Pfam PF00434; VP7; 1;

Computed features [?]

General Signal; -; 1;

Features [?]

From: VP7_ROTSH (A2T3P5)
Key     From     To       Description   Tag   Condition   FTGroup
SIGNAL     Nter     50                
CHAIN     51     Cter       Outer capsid glycoprotein VP7        
REGION     51     78       Disorded; interaction with the intermediate capsid protein VP6        
REGION     312     Cter       Disorded        
METAL     95     95       Calcium 1     D  
METAL     206     206       Calcium 1; via carbonyl oxygen     G  
METAL     214     214       Calcium 1; via carbonyl oxygen     [TS]  
METAL     216     216       Calcium 1     E  
METAL     177     177       Calcium 2     Q  
METAL     228     228       Calcium 2     D  
METAL     229     229       Calcium 2; via carbonyl oxygen     V  
METAL     231     231       Calcium 2     D  
METAL     301     301       Calcium 2     D  
DISULFID     82     135             C-x*-C  
DISULFID     165     249             C-x*-C  
DISULFID     191     244             C-x*-C  
DISULFID     196     207             C-x*-C  
REGION     237     239       LVD motif; interaction with ITGA4/ITGB1 heterodimer     L-D-V  
REGION     253     255       GPR motif; interaction with ITGAX/ITGB2     G-P-R  
REGION     165     167       CNP motif; interaction with ITGAV/ITGB3     C-N-P  

Additional information [?]

Size range 300-331 amino acids
Related rules None
Fusion None