FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000103288
Interaction Network
Interactions Browser links
rho-4 network
spi network
Reported Interactions
FBrf0151285-4.ENZ.WB
Reference
Description
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Rho-4

enzyme

Rho-4

enzyme
spi 

Spi

enzyme target

GFP tag

spi 

Spi

enzyme target

GFP tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction
FBrf0188439-2.ENZ.WB
Reference
Description
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

DmRho4

enzyme

GST tag

DmRho4

enzyme

GST tag

spi 

Spi

enzyme target

fused to GFP extracellular domain with cytosolic FLAG tag

spi 

Spi

enzyme target

fused to GFP extracellular domain with cytosolic FLAG tag

spi 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction
FBrf0188439-3.ENZ.WB
Reference
Description
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

DmRho4

enzyme

GST tag

DmRho4

enzyme

GST tag

spi 

Spi

enzyme target

fused to Hsap\APP extracellular domain with cytosolic FLAG tag

spi 

Spi

enzyme target

fused to Hsap\APP extracellular domain with cytosolic FLAG tag

spi 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction
FBrf0228902-1.ENZ.WB
Reference
Description
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

DmRho4

enzyme

GST tag

DmRho4

enzyme

GST tag

spi 

Spi

enzyme target

fused to Hsap\APP extracellular domain with cytosolic FLAG tag

spi 

Spi

enzyme target

fused to Hsap\APP extracellular domain with cytosolic FLAG tag

spi 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction
FBrf0228902-2.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

DmRho4

bait

FLAG tag

spi 

Spitz

prey

GFP tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

The coimmunoprecipitation of spi with rho-4 is not affected by treatment with Ca2+ ionophore. Also, there is no evidence for rho-4 homodimerization in the presence or absence of Ca2+.

Source was cell extract of S2R+ cell line; bait produced from transfected construct; prey produced from transfected construct.

A catalytically inactive from of rho-4 was used in this assay.

FBrf0228902-3.ENZ.MS
Reference
Description
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

DmRho4

enzyme

GST tag

DmRho4

enzyme

GST tag

spi 

Spi

enzyme target

fused to Hsap\APP extracellular domain with cytosolic FLAG tag

spi 

Spi

enzyme target

fused to Hsap\APP extracellular domain with cytosolic FLAG tag

spi 
spi 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction
External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (3)