FB2026_02 , released June 18, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000097150
Interaction Network
Interactions Browser links
nanos network
cup network
Reported Interactions
FBrf0131417-1.Y2H
Description
physical association
Assay
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nos

bait

fused to GAL4 DNA-binding domain

cup 

Cup

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

Source was yeast cell line; bait produced as transgenic fusion protein; prey produced as transgenic fusion protein (prey from embryo cDNA expression library).

Two-hybrid system: yeast GAL4-BD/GAL4-AD

FBrf0131417-2.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nos

bait

fused to GAL4 DNA-binding domain

cup 

Cup

prey

fused to GAL4 activation domain

cup 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cup 
central region
sufficient binding region
aa 593-962
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Two-hybrid system: yeast GAL4-BD/GAL4-AD

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

FBrf0131417-3.PD.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cup 

Cup

bait

GST tag

nos

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

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

FBrf0131417-4.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cup 

Cup

bait

fused to GAL4 DNA-binding domain

Nos

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
N-terminal region
sufficient binding region
aa 1-171aa 171-401

partial binding

partial binding

N-terminal region
necessary binding region
aa 43-287
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).

At least two redundant sub-domains within nos mediate binding to cup.

Two-hybrid system: yeast GAL4-BD/GAL4-AD

FBrf0131417-5.PD.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cup 

Cup

bait

GST tag

Nos

prey

[35]S label

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
N-terminal region
sufficient binding region
aa 1-287
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.

FBrf0135777-3.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nos

bait

fused to GAL4 DNA-binding domain

cup 

Cup

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

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 GAL4-BD/GAL4-AD

Positive control.

FBrf0194692-6.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nos

bait

fused to GAL4 DNA-binding domain

cup 

Cup

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
N-terminal region
sufficient binding region
aa 1-288

coordinates relative to nos-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).

Two-hybrid system: yeast GAL4-BD/GAL4-AD

Positive control.

FBrf0212721-1.PD.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note

nos

bait

biotin label

cup 

Cup

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
3 prime UTR
sufficient binding region
nt 7-161
SRE
mutation disrupting interaction
nt 52-62
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 by in vitro translation.

nos mRNA missing a 7-methylguanylate cap do not bind cup.

FBrf0236765-10.PD.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

nos

bait

biotin label

cup 

Cup

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
3-prime UTR
sufficient binding region
nt 7-161
SRE
mutation decreasing interaction
CTGGC

both SREs in nos 3-prime UTR changed from CTGGC to CTCGC

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 embryo extract.

Stoichiometry approximately 1:1 regardless of RNA length.

FBrf0236765-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

nos

bait

biotin label

cup 

Cup

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
3-prime UTR
sufficient binding region
nt 7-161
SRE
mutation decreasing interaction
CTGGC

both SREs in nos 3-prime UTR changed from CTGGC to CTCGC

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 embryo extract.

Stoichiometry approximately 1:1 regardless of RNA length.

FBrf0260793-2.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

nanos

bait

fused to GAL4 DNA-binding domain

cup 

Cup

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
N-terminal domain
sufficient binding region
aa 1-289
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Two-hybrid system: yeast GAL4-BD/GAL4-AD; positive control

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

FBrf0262483-32.CL.FM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cup 

cup

bait

mCherry tag, fused to the plasma membrane

Nanos

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

Source was live S2R+ cells; bait and prey produced from endogenous genes.

cup was fused to a plasma membrane anchor. The ability of this chimera to recruit prey protein to the plasma membrane was taken as evidence of direct physical interaction.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (7)