FB2026_02 , released June 18, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000094942
Interaction Network
Interactions Browser links
bru1 network
osk network
Reported Interactions
FBrf0082225-1a.XL.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

[32]P label

bru1 

Bru

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 and labeled by in vitro transcription; prey derived from wild-type ovary extract.

FBrf0098905-1.XL.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

BRE

bait

16 tandem copies of BRE; [32]P label

osk 
bru1 

bruno

prey
bru1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
bru1 
C-terminal region
unspecified role
aa 416-6104
osk 
BRE
unspecified role
nt 3475-3498

sufficient, bruno (aret) response element

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

Antibody supershift confirms that the BRE binding factor is aret protein.

Bait RNA derived from in vitro transcription.

Prey expressed from ovary cDNA in bacteria.

FBrf0125136-1a.XL.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

[32]P label

osk 
bru1 

Bru

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
Bruno response element A region
sufficient binding region
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced and labeled by in vitro transcription; prey derived from wild-type ovary extract.

FBrf0206986-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

biotin label

osk 
bru1 

Bru

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR
sufficient binding region
nt 1850-2068
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced and labeled by in vitro transcription; prey derived from wild-type ovarian extract.

FBrf0214798-9.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

biotin label

osk 
bru1 

bru1

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR
sufficient binding region
nt 2777-2869

coordinates relative to osk-RA

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

Source was embryos of wild-type fly line; bait produced and labeled by in vitro transcription; prey produced from endogenous gene.

FBrf0215430-1.PD.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

Bru

bait

GST tag

osk 

osk

prey

[35]S label

osk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
Bruno response element
sufficient binding region

4 tandem copies of BRE

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

Positive control.

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

FBrf0215883-1.XL.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

Oskar synonym

bait

[32]P label

osk 
bru1 

Bru synonym

prey
bru1 
bru1 
bru1 
bru1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
bru1 
RRM1,RRM2 domain
sufficient binding region
aa 149-317

coordinates relative to bru1-PA

bru1 
RRM3+ domain
sufficient binding region
aa 470-604

coordinates relative to bru1-PA

bru1 
RRM3 domain residues 521,523
mutation disrupting interaction
aa 521,523

N521A,F523A, coordinates relative to bru1-PA

bru1 
RRM2 domain residues 239,241
mutation disrupting interaction
aa 239,241

K239A,F241A, coordinates relative to bru1-PA

osk 
3-prime UTR
mutation decreasing interaction

mutations in AB region

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

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

FBrf0219327-1.FB.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

bru1

bait

His tag

osk 

Bru

prey

[32]P label

osk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3 prime UTR AB domain
sufficient binding region
nt 2669-2795
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 transcription.

FBrf0227674-5a.XL.A
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

[32]P label

osk 
bru1 

Bru

prey
bru1 
bru1 
bru1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR
sufficient binding region
bru1 
interacting amino acid 4
mutation decreasing interaction
aa 4

S4E requires the mutation S7E to decrease the interaction.

bru1 
interacting amino acid 7
mutation decreasing interaction
aa 7

S7E requires the mutation S4E to decrease the interaction.

bru1 
interacting amino acid 135
mutation decreasing interaction
aa 135

T135E requires the mutations S4E and S7E to decrease the interaction.

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

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

FBrf0228572-1.XL.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk synonym

bait

[32]P label

osk 
bru1 

Bru synonym

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR region C
sufficient binding region
UCUACUUUAAAGUCUUCUAGAUAGCUAUCUACUAUUUAUAAACUUAUUUAUUGUCUUGAAUGUAUGUUAAUUGUAUGUAUUGAUGGUGAUCACGUUUUUUUUGUCCUAUAACAAGCUGCAAUGUAAAAUCCAAAAAAAAAAUG
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced and labeled by in vitro transcription; prey derived from wild-type adult female ovary extract.

FBrf0228572-2.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk synonym

bait

S1 tag

osk 
osk 
bru1 

Bru synonym

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR region C
sufficient binding region
UCUACUUUAAAGUCUUCUAGAUAGCUAUCUACUAUUUAUAAACUUAUUUAUUGUCUUGAAUGUAUGUUAAUUGUAUGUAUUGAUGGUGAUCACGUUUUUUUUGUCCUAUAACAAGCUGCAAUGUAAAAUCCAAAAAAAAAAUG
osk 
3-prime UTR 977-994
necessary binding region
UAACAAGCUGCAAUGUAA
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced by in vitro transcription; prey derived from wild-type adult female ovary extract.

FBrf0230244-2.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

S1 aptamer

osk 
bru1 

Bru

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
interaction domain 1
sufficient binding region

Final 150 nt of osk mRNA (C region)

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

Interaction in vitro; bait produced by in vitro transcription; prey produced by endogenous gene of ovary extract.

FBrf0240993-4.EMSA.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

Bru

bait
osk 

osk

prey

[32]P label

osk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR
sufficient binding region
unspecified
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 synthesized and end-labeled in vitro.

Positive control.

FBrf0240993-8.coIP.PCR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

Bru

bait
osk 

osk

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 adult female ovary; bait produced from endogenous gene; prey produced from endogenous gene.

Positive control.

FBrf0244799-17.coIP.PCR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

Bru1

bait

GFP tag

osk 

osk

prey
osk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR
sufficient binding region
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

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

The bru1-osk interaction is increased with decreased levels of pAbp or Mkrn1 expression.

FBrf0244799-18.coIP.PCR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

Bru1

bait
osk 

osk

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

The bru1-osk interaction is increased in a Mkrn1 mutant background.

Source was adult female ovaries; bait produced from endogenous gene; prey produced from endogenous gene.

FBrf0253176-1.EMSA
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
bru1 

Bruno

bait

His-EGFP tag

osk 

oskar

prey

atto633 label

osk 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3 prime UTR
sufficient binding region
unspecified
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced as a recombinant fusion protein in Sf-21 cell system; prey produced and labeled by in vitro transcription.

FBrf0260912-1.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
osk 

osk

bait

biotin label

osk 
bru1 

bru1

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
osk 
3-prime UTR oocyte entry signal
mutation decreasing interaction
nt CCGCGG

CCGCGG to UUGCGG; within the context of nt 1-359

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

Interaction in vitro; bait produced and labeled by in vitro transcription; prey derived from wild-type ovary extract.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (15)