FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Physical Interaction report
Open Close
General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000040694
Interaction Network
Interactions Browser links
kay network
Jra network
Reported Interactions
FBrf0051862-1.EMSA.A
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
kay 

dFRA

neutral component
kay 

dFRA

neutral component
kay 

dFRA

neutral component
Jra 

dJRA

neutral component
Jra 

dJRA

neutral component
Jra 

dJRA

neutral component
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.

Interaction of kay and Jra was observed as a slower moving complex on the EMSA gel distinct from the complex formed by either kay or Jra alone and appears to have a higher affinity fo the AP-1 site used as a probe.

FBrf0218395-4293.DPiM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Jra 
unspecified role
Jra 
unspecified role
Jra 
unspecified role
kay 
unspecified role
kay 
unspecified role
kay 
unspecified role
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

HGScore = 130.65788

FBrf0227576-49.FRET
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Jra 

DM14

fluorescence donor

fluorescein label

Jra 

DM14

fluorescence donor

fluorescein label

Jra 
Jra 

DM14

fluorescence donor

fluorescein label

Jra 
kay 

DM3

fluorescence acceptor

TAMRA label

kay 
kay 

DM3

fluorescence acceptor

TAMRA label

kay 

DM3

fluorescence acceptor

TAMRA label

kay 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Jra 
bZIP domain
sufficient binding region
NPIDMEAQEKIKLERKRQRNRVAASKCRKRKLERISKLEDRVKVLKGENVDLASIVKNLKDHVAQLKQQVMEHI
kay 
bZIP domain
sufficient binding region
RSTNMTPEEEQKRAVRRERNKQAAARCRKRRVDQTNELTEEVEQLEKRGESMRKEIEVLTNSKNQLEYLLATHRATCQKIRSDMLSVVTCNGLIA
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; fluorescence donor produced as a recombinant fusion protein in bacterial system and labeled in vitro; fluorescence acceptor produced as a recombinant fusion protein in bacterial system and labeled in vitro.

Dissociation constant of Kd=14nM.

Interactions between bZIP proteins were quantified in vitro using a solution FRET assay at 4oC, 21oC and 37oC. Only interactions at 21oC with Kd < 5000 nm were curated by FlyBase.

FBrf0227576-51.FRET
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
kay 

DM3

fluorescence donor

fluorescein label

kay 

DM3

fluorescence donor

fluorescein label

kay 
kay 

DM3

fluorescence donor

fluorescein label

kay 
Jra 

DM14

fluorescence acceptor

TAMRA label

Jra 
Jra 

DM14

fluorescence acceptor

TAMRA label

Jra 

DM14

fluorescence acceptor

TAMRA label

Jra 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
kay 
bZIP domain
sufficient binding region
RSTNMTPEEEQKRAVRRERNKQAAARCRKRRVDQTNELTEEVEQLEKRGESMRKEIEVLTNSKNQLEYLLATHRATCQKIRSDMLSVVTCNGLIA
Jra 
bZIP domain
sufficient binding region
NPIDMEAQEKIKLERKRQRNRVAASKCRKRKLERISKLEDRVKVLKGENVDLASIVKNLKDHVAQLKQQVMEHI
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; fluorescence donor produced as a recombinant fusion protein in bacterial system and labeled in vitro; fluorescence acceptor produced as a recombinant fusion protein in bacterial system and labeled in vitro.

Dissociation constant of Kd=12nM.

Interactions between bZIP proteins were quantified in vitro using a solution FRET assay at 4oC, 21oC and 37oC. Only interactions at 21oC with Kd < 5000 nm were curated by FlyBase.

FBrf0241977-383.Y2H
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Jra 

Jra

bait

fused to GAL4 DNA-binding domain

kay 

kay

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

FBrf0250119-5.PD.WB
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
kay 

Kay

bait

GST tag

Jra 

Jun

prey

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; bait produced as a recombinant fusion protein in bacterial system; prey produced as a recombinant fusion protein in bacterial system.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (5)