FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000095394
Interaction Network
Interactions Browser links
Cdc42 network
Cip4 network
Reported Interactions
FBrf0206177-1.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Cip4 

Cip4

bait

fused to DNA-binding domain

Cip4 

Cdc42

prey

fused to activation domain

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Cip4 
HR1 domain
necessary binding region
379-455

coordinates relative to Cip4-PB

Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Source was yeast cell line; bait produced as transgenic fusion protein; prey produced as transgenic fusion protein (prey was previously cloned reagent).

Two-hybrid system: yeast

A mutated form of Cdc42 bearing an activating mutation (G12V) and a disruption of the prenylation motif (C189S).

FBrf0206177-2.PD.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cdc42

bait

GST tag

Cip4 

Cip4

prey

[35]S label

Cip4 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Cip4 
C-terminal region
sufficient binding region
aa 332-631

coordinates relative to Cip4-PB

Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced as a recombinant fusion protein in bacterial system; prey produced and labeled by in vitro translation.

FBrf0209286-12.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cdc42

bait

GST tag

Cip4 

Cip4

prey
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

Interaction in vitro; bait produced as a recombinant fusion protein in bacterial system; prey derived from S2R+ cell extract.

FBrf0211075-1.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Cip4 

dCIP4

bait

GST tag

Cip4 

Cdc42V12

prey

Myc tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Cip4 
HR1 domain
unspecified role
aa 436

necessary: L436S mutation abolishes interaction

Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Bait expressed and purified from bacteria.

Prey expressed in transiently transfected HEK293T cells.

Cip4 interacts with the constitutively active Cdc42 V12 mutant, but not the constitutively inactive Cdc42 N17 mutant.

GST pull down.

FBrf0230860-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cdc42

bait

GST tag

Cip4 

Cip4

prey

EGFP 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

Positive control.

Cip4 binds to GTP-bound Cdc42.

Interaction in vitro; bait produced as a recombinant fusion protein in bacterial system; prey derived from transfected S2R+ extract.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (4)