FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000106418
Interaction Network
Interactions Browser links
Unr network
pAbp network
Reported Interactions
FBrf0209401-1.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Unr 

UNR

bait
pAbp 

PABP

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 embryos of wild-type fly line; bait produced from endogenous gene; prey produced from endogenous gene.

FBrf0209401-2.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Unr 

UNR

bait

GST tag

pAbp 

PABP

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

eIF4B does not bind to pAbp in this experiment.

Embryonic extract was treated with RNase to demonstrate that the interaction is RNA independant.

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

FBrf0209401-4.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Unr 

UNR

bait

GST tag

pAbp 

PABP

prey

V5 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 and labeled by in vitro translation.

FBrf0255930-1.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Unr 

Unr

neutral component

His tag

Unr 

Unr

neutral component

His tag

Unr 

Unr

neutral component

His tag

pAbp 

pAbp

neutral component

His tag

pAbp 

pAbp

neutral component

His tag

pAbp 

pAbp

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.

Estimated molecular mass consistent with a complex between Unr and pAbp.

FBrf0255930-2.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Unr 

Unr

neutral component

His tag

Unr 

Unr

neutral component

His tag

Unr 
Unr 
Unr 
Unr 

Unr

neutral component

His tag

Unr 
Unr 
Unr 
pAbp 

pAbp

neutral component

His tag

pAbp 
pAbp 
pAbp 
pAbp 

pAbp

neutral component

His tag

pAbp 

pAbp

neutral component

His tag

pAbp 
pAbp 
pAbp 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Unr 
ncCSD8
sufficient binding region
aa 840-922
Unr 
CSD12
sufficient binding region
unspecified
Unr 
CSD789
sufficient binding region
aa 756-990
pAbp 
RRM3 domain
sufficient binding region
aa 176-263

coordinates relative to pAbp-PA

pAbp 
RRM2 domain
sufficient binding region
aa 90-176

coordinates relative to pAbp-PA

pAbp 
Linker PABP domain
sufficient binding region
aa 362-634

coordinates relative to pAbp-PA

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

Interaction in vitro; protein produced as a recombinant fusion protein in bacterial system; RNA chemically synthesized.

Unr ncCSD8 domain interacts with pAbp RRM3 domain; Unr CSD12 domain interacts with pAbp RRM2 and linker PABP domains. NMR spectra show competitive binding between an A8-mer RNA and Unr CSD789 to pAbp RRM3.

FBrf0255930-3.XC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Unr 

Unr

neutral component

His tag

Unr 
Unr 

Unr

neutral component

His tag

Unr 
Unr 

Unr

neutral component

His tag

pAbp 
pAbp 

pAbp

neutral component

His tag

pAbp 

pAbp

neutral component

His tag

pAbp 
pAbp 

pAbp

neutral component

His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Unr 
ncCSD8
sufficient binding region
aa 840-922

within the context of CSD789 aa 756-990.

pAbp 
RRM3 domain
sufficient binding region
aa 176-263

coordinates relative to pAbp-PA

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.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (2)