FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000095510
Interaction Network
Interactions Browser links
exd network
abd-A network
Reported Interactions
FBrf0080135-3.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
exd 

EXD

bait

fused to GAL4 DNA-binding domain

ABD-A

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

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

FBrf0110701-4.EMSA.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

ABD A

neutral component

His tag

ABD A

neutral component

His tag

ABD A

neutral component

His tag

exd 

Exd

neutral component

His tag

exd 

Exd

neutral component

His tag

exd 

Exd

neutral component

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

Interaction in vitro; proteins produced as a recombinant fusion protein in bacterial system.

Only heterodimers of abd-A and exd bind strongly to the DNA probe tested; alone, neither binds the DNA probe very well, if at all. Heterodimer formation is affected by mutations in the DNA target.

abd-A and/or exd proteins were mixed with [32]P labeled fkh DNA. DNA-protein complexes observed by EMSA were used to deduce protein-protein interactions.

FBrf0179749-3.EMSA.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
exd 

exd

neutral component

His tag

exd 

exd

neutral component

His tag

exd 

exd

neutral component

His tag

abd-A

neutral component

His tag

abd-A

neutral component

His tag

abd-A

neutral component

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

Interaction in vitro; proteins produced as a recombinant fusion proteins in bacterial system.

exd and hth were expressed and purified together as a heterodimer. Addition of abd-A results in trimer and tetramer formation on [32]P labeled DNA. Formation of these higher order complexes is

inhibited and partially supershifted by the addition of anti-En antibody indicating the complex contains en

FBrf0213066-1a.BiFC.FM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
exd 

exd

bait

Venus tag, N-terminal fragment

abd-A

prey

Venus tag, C-terminal fragment

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 embryos of transgenic fly line; bait produced from tagged transgenic construct; prey produced from tagged transgenic construct.

Embryos were collected overnight and incubated at 4 degrees C for 28 hrs prior to BiFC detection.

FBrf0213066-2.BiFC.FM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

abd-A

neutral component

Venus, mCherry or Cerulean tag, N-terminal fragment

abd-A

neutral component

Venus, mCherry or Cerulean tag, N-terminal fragment

abd-A

neutral component

Venus, mCherry or Cerulean tag, N-terminal fragment

exd 

exd

neutral component

Venus, mCherry or Cerulean tag, C-terminal fragment

exd 

exd

neutral component

Venus, mCherry or Cerulean tag, C-terminal fragment

exd 

exd

neutral component

Venus, mCherry or Cerulean tag, C-terminal fragment

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 embryos of transgenic fly line; bait produced from tagged transgenic construct; prey produced from tagged transgenic construct.

Embryos were collected overnight and incubated at 4 degrees C for 28 hrs prior to BiFC detection.

FBrf0218732-12.EMSA.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
exd 

Exd

neutral component
exd 

Exd

neutral component
exd 

Exd

neutral component

AbdA

neutral component

AbdA

neutral component

AbdA

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
UbdA domain
mutation decreasing interaction
unspecified

KEINEQ to KAAAAQ

TD domain
mutation decreasing interaction
unspecified

TDWM to AAAM

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

Interaction in vitro; proteins produced by in vitro transcription/translation.

exd, hth and abd-A, in various combinations, were mixed with [32]P labeled DNA. DNA-protein complexes observed by EMSA, corresponding to abd-A-exd heterodimers and abd-A-exd-hth heterotrimers, were used to deduce protein-protein interactions.

FBrf0218732-5.BiFC.FM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
exd 

Exd

bait

Venus tag, N-terminal fragment

exd 

AbdA

prey

Venus tag, C-terminal fragment

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
exd 
HD domain residue 51
mutation decreasing interaction
aa 51

N51A

UbdA domain
mutation decreasing interaction
unspecified

KEINEQ to KAAAAQ

TD domain
mutation decreasing interaction
unspecified

TDWM to AAAM

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

Source was embryos of transgenic fly line; bait produced from tagged transgenic construct; prey produced from tagged transgenic construct.

FBrf0225999-1.BiFC.FM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
exd 

exd

bait

Venus tag, N-terminal fragment

abd-A

prey

Venus tag, C-terminal fragment

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 embryos of transgenic fly line; proteins produced from tagged transgenic constructs.

FBrf0254409-1.EMSA.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Abd-A

neutral component

His tag

Abd-A

neutral component

His tag

Abd-A

neutral component

His tag

exd 

Exd

neutral component

His tag

exd 

Exd

neutral component

His tag

exd 

Exd

neutral component

His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
W1W2-delta-UR domains
necessary binding region
unspecified

Within the context of aa 88-330, W1W2 domains were mutated and the UR domain deleted.

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

Interaction in vitro; proteins produced as a recombinant fusion proteins in bacterial system.

abd-A and exd were mixed with [32]P labeled DNA. DNA-protein complexes observed by EMSA were used to deduce protein-protein interactions. Addition of grh resulted in a tetra-complex with abd-A, exd and DNA.

FBrf0254409-4.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Abd-A

bait

GST tag

exd 

Exd

prey

His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Homeodomain residue 50
mutation decreasing interaction
aa 50

Q50K

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

Interaction in vitro; bait and prey produced as recombinant fusion proteins in bacterial system.

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