FB2026_03 , released September 17, 2026
Physical Interaction report
Open Close
General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000121144
Interaction Network
Interactions Browser links
Smurf network
Mad network
Reported Interactions
FBrf0160739-1.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Mad 

Mad

bait

fused to LexA DNA-binding domain

Smurf

prey

fused to B42 activation domain

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
WW2 and WW3 domain
necessary binding region
aa 513-602

coordinates relative to Smurf-PA

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).

FBrf0160739-2.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Smurf

bait

Myc tag

Mad 

Mad

prey

FLAG tag

Mad 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Mad 
C-terminal phosphorylation residues 453 and 455
mutation disrupting interaction
aa 453 and 455

S453A, S455A coordinates relative to Smurf-PA

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

Source was cell extract of 293T cell line; bait produced from transfected construct; prey produced from transfected construct.

interaction is stronger in the presence of constitutively active TKV; Smurf C1029A was used to prevent Mad degradation

FBrf0160739-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Smurf

bait

GST tag

Mad 

Mad

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
interaction domain
sufficient binding region
aa 513-612

coordinates relative to Smurf-PA

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

Smurf had stronger binding to endogenous phospho-MAD, which is further enhanced by proteasome inhibitor MG-132

Interaction in vitro; bait produced as a recombinant fusion protein in bacterial system; prey derived from S2 cell extract.

FBrf0160739-5.ENZ.A
Reference
Description
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Smurf

enzyme

Myc tag

Smurf

enzyme

Myc tag

Mad 

Mad

enzyme target

His tag

Mad 

Mad

enzyme target

His 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
FBrf0255681-19.coIP.WB
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Mad 

Mad

bait

FLAG tag

Smurf

prey

Myc 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

Source was cell extract of S2 cell line; bait and prey produced from transfected constructs.

An enzymatically inactive Smurf construct was used.

FBrf0257934-1.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Mad 

SMAD

bait

fused to GAL4 DNA-binding domain

SMURF

prey

fused to GAL4 activation domain

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

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

External Crossreferences and Linkouts ( 0 )
References (3)