FB2026_03 , released September 17, 2026
Physical Interaction report
Open Close
General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000105039
Interaction Network
Interactions Browser links
gukh network
dlg1 network
Reported Interactions
FBrf0146937-1.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
dlg1 

DLG

bait

fused to LexA DNA-binding domain

dlg1 
gukh 

GUHK

prey

fused to B42 activation domain

gukh 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
dlg1 
GUK domain
sufficient binding region
aa 765-960

coordinates relative to dlg1-PD

gukh 
C-terminal region
sufficient binding region
aa 888-1044

coordinates relative to gukh-PC

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).

9 gukh clones were recovered among 38 positives in this dlg1 two hybrid screen.

Two-hybrid system: yeast LexA-BD/B42-AD

FBrf0146937-2.coIP.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GUKH

bait
dlg1 

DLG

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 larval body wall muscle of wild-type fly line; bait produced from endogenous gene; prey produced from endogenous gene.

FBrf0195273-1.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GukH

bait

fused to GAL4 DNA-binding domain

gukh 
dlg1 

Dlg

prey

fused to GAL4 activation domain

dlg1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
dlg1 
GK domain
sufficient binding region
aa 764-960

coordinates relative to dlg1-PE

gukh 
Dlg binding domain
sufficient binding region
aa 1494-1788

coordinates relative to gukh-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

FBrf0195273-2.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GukH

bait

GST tag

gukh 
gukh 
gukh 
gukh 
gukh 
gukh 
dlg1 

Dlg

prey

[35]S label

dlg1 
dlg1 
dlg1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
dlg1 
GK domain
sufficient binding region
aa 764-960

coordinates relative to dlg1-PE

dlg1 
SH3 domain
sufficient binding region
aa 581-681

coordinates relative to dlg1-PE

dlg1 
SH3 domain
necessary binding region
aa 572-681

coordinates relative to dlg1-PE

gukh 
proline rich sequence 1
sufficient binding region
aa 1513-1526

coordinates relative to gukh-PA

gukh 
proline rich sequence 2
sufficient binding region
aa 1617-1630

coordinates relative to gukh-PA

gukh 
proline rich sequence 3
sufficient binding region
aa 1774-1787

coordinates relative to gukh-PA

gukh 
proline rich sequence 1
mutation disrupting interaction
aa 1518,1521

multiple alanine substitutions, coordinates relative to gukh-PA

gukh 
proline rich sequence 2
mutation disrupting interaction
aa 1618,1622,1625

multiple alanine substitutions, coordinates relative to gukh-PA

gukh 
proline rich sequence 3
mutation disrupting interaction
aa 1775,1779,1782

multiple alanine substitutions, coordinates relative to gukh-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 and labeled by in vitro translation.

FBrf0195273-3.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GukH

bait

HA tag

dlg1 

Dlg

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 transfected construct.

FBrf0215144-2.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GukH

bait

fused to GAL4 DNA-binding domain

gukh 
dlg1 

DlgGK

prey

fused to GAL4 activation domain

dlg1 
dlg1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
dlg1 
GK domain
sufficient binding region
aa 771-975

coordinates relative to dlg1-PG

gukh 
interaction domain
sufficient binding region
aa 749-1044

coordinates relative to gukh-PC

dlg1 
GK domain
mutation disrupting interaction
aa 822aa 830aa 831aa 855

R822A, coordinates relative to dlg1-PG

D830G, coordinates relative to dlg1-PG

Y831A, coordinates relative to dlg1-PG

Y855A, coordinates relative to dlg1-PG

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).

FBrf0215470-2.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GUKHolder

bait

fused to GAL4 DNA-binding domain

gukh 
dlg1 

Dlg

prey

fused to GAL4 activation domain

dlg1 
dlg1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
dlg1 
PDZ-SH3-GK domain
sufficient binding region
aa 474-975

coordinates relative to dlg1-PG

gukh 
binding domain
sufficient binding region
aa 749-1044

coordinates relative to gukh-PC

dlg1 
PDZ domain
necessary binding region
aa 474-597

coordinates relative to dlg1-PG

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).

The F domain of dlg1 inhibits interaction with gukh

FBrf0215470-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
dlg1 

Dlg

bait

GST tag

dlg1 
dlg1 
gukh 

GUKHolder

prey

HA tag

gukh 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
dlg1 
PDZ-SH3-GK domain
sufficient binding region
aa 474-975

coordinates relative to dlg1-PG

dlg1 
sw mutant
mutation disrupting interaction
aa 961

Frameshift mutation that deletes the F domain, coordinates relative to dlg1-PG

gukh 
binding domain
sufficient binding region
aa 800-1044

coordinates relative to gukh-PC

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.

FBrf0237390-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
gukh 

GukH

bait

GST tag

gukh 
dlg1 

Dlg

prey

His tag

dlg1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
gukh 
interaction domain
sufficient binding region
aa 749-1044
dlg1 
GK domain
sufficient binding region
aa 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 produced and labeled by in vitro translation.

A fragment of dlg1 with both SH3 and GK domains fails to interact with gukh. Modification of either aPKC phosphorylation site with phosphomimetic mutations, S662D or S676D, allows dlg1 SH3GK to interact with gukh.

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