FB2025_05 , released December 11, 2025
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000100831
Interaction Network
Interactions Browser links
Sos network
drk network
Reported Interactions
FBrf0057899-3.FW.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Sos 

Sos

bait

GST tag

Sos 
drk 

Drk

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Sos 
C-terminal tail
sufficient binding region
aa 1225-1405

coordinates relative to Sos-PA

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 as a recombinant fusion protein in bacterial system.

FBrf0057899-4.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Sos 

Sos

bait

GST tag

Sos 
drk 

Drk

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Sos 
C-terminal tail
sufficient binding region
aa 1225-1405

coordinates relative to Sos-PA

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 transgenic adult extract.

FBrf0103310-2.LPD.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
drk 

Drk

bait

GST tag, [32]P

drk 
Sos 

Sos

prey

β-gal fusion

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
drk 
N-terminal SH3 domain
sufficient binding region
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 as a recombinant fusion protein in bacterial system (prey from embryo cDNA expression library).

Two of 28 positive clones (from 500,000 plaques screened) corresponded to Sos.

Bait GST-drk protein was [32]P labeled in vitro at an engineered PKA site in the linker, and used to probe a λgt11 cDNA expression library.

Positive control.

FBrf0224702-93.coIP.MS
Description
physical association
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
drk 

drk

bait

TAP tag

Sos 

Sos

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

Source was cell extract of S2 cell line; bait produced from transfected construct; prey produced from endogenous gene.

Overall SAINT probability of interaction = 1.

FBrf0254351-1.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
drk 

Drk

neutral component

His tag

drk 
drk 

Drk

neutral component

His tag

drk 
drk 

Drk

neutral component

His tag

Sos 
Sos 
Sos 

Sos

neutral component
Sos 

Sos

neutral component
Sos 
Sos 
Sos 

Sos

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
drk 
CSH3 domain
sufficient binding region
aa 153-211

coordinates relative to drk-PA

Sos 
S1 domain
sufficient binding region
aa 1339-1350

coordinates relative to Sos-PA

Sos 
S2 domain
sufficient binding region
aa 1377-1389

coordinates relative to Sos-PA

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

Interaction in vitro; drk protein produced as a recombinant fusion protein in bacterial system; Sos peptide chemically synthesized

FBrf0256118-1.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Sos 

Sos

neutral component
Sos 
Sos 

Sos

neutral component
Sos 
Sos 

Sos

neutral component
drk 
drk 

Drk

neutral component
drk 

Drk

neutral component
drk 
drk 

Drk

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Sos 
disordered domain site 2
sufficient binding region
aa YRAVPPPLPPRR
drk 
SH3 domain
sufficient binding region
aa 1-59

Contains T22G mutation for stability.

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

Increasing temperature decreases Sos-drk interaction.

Interaction in vitro; SOS peptide chemically synthesized; drk protein produced as a recombinant fusion protein in bacterial system.

FBrf0256118-2.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Sos 

Sos

bait
Sos 
drk 

Drk

prey
drk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Sos 
disordered domain site 2
sufficient binding region
aa 1177-1405-101

IDR sites 1,3 and 4 contain mutations to focus binding on site 2.

drk 
SH3 domain
sufficient binding region
aa 1-59

Contains T22G mutation for stability.

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 as a recombinant fusion protein in bacterial system.

FBrf0256118-3.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Sos 

Sos

neutral component
Sos 

Sos

neutral component
Sos 
Sos 

Sos

neutral component
Sos 
drk 

Drk

neutral component
drk 
drk 

Drk

neutral component
drk 

Drk

neutral component
drk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Sos 
disordered domain site 2
sufficient binding region
aa 1177-1405-101

IDR sites 1,3 and 4 contain mutations to focus binding on site 2.

drk 
SH3 domain
sufficient binding region
aa 1-59

Contains T22G mutation for stability.

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

Increasing temperature decreases Sos-drk interaction.

Interaction in vitro; protein produced as a recombinant fusion protein in bacterial system; RNA chemically synthesized.

FBrf0257666-3.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
drk 

Drk

neutral component
drk 

Drk

neutral component
drk 
drk 
drk 

Drk

neutral component
drk 
drk 
Sos 

Sos

neutral component
Sos 
Sos 
Sos 

Sos

neutral component
Sos 

Sos

neutral component
Sos 
Sos 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
drk 
N terminal SH3 domain
sufficient binding region
aa 1-59

coordinates relative to drk-PA

drk 
C terminal SH3 domain
sufficient binding region
aa 152-211

coordinates relative to drk-PA

Sos 
proline rich motif 1
sufficient binding region
YRAVPPPLPPRR

aa 1339-1350; coordinates relative to Sos-PA

Sos 
proline rich motif 2
sufficient binding region
GELSPPPIPPRL

aa 1377-1388; coordinates relative to Sos-PA

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

Interaction in vitro; Drk protein produced as a recombinant fusion protein in bacterial system; Sos peptide chemically synthesized.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (6)