FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000101178
Interaction Network
Interactions Browser links
Cp190 network
CTCF network
Reported Interactions
FBrf0200449-1.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait
CTCF 

dCTCF

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 endogenous gene; prey produced from endogenous gene.

FBrf0200449-2.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait
CTCF 

dCTCF

prey

FLAG 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 cell extract of S2 cell line; bait produced from endogenous gene; prey produced from transfected construct.

FBrf0200449-3.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

dCTCF

bait

FLAG tag

CP190

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 endogenous gene.

FBrf0201197-2.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait
CTCF 

dCTCF

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 embryonic nuclear extract of wild-type fly line; bait produced from endogenous gene; prey produced from endogenous gene.

FBrf0201197-5.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

fused to DNA-binding domain

CTCF 

dCTCF

prey

fused to activation domain

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
C-terminal region
sufficient binding region
aa 605-1103
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

FBrf0214686-3.CH.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait
CTCF 

CTCF

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.

FBrf0222846-1.coIP.WB
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait
CTCF 

dCTCF

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 endogenous gene; prey produced from endogenous gene.

Several insulator proteins examined (Cp190, su(Hw), mod(mdg4) and CTCF) are PARylated in S2 cells. These proteins are also PARylated in vitro by human PAR polymerase in vitro. Inhibition of PARylation reduces the localization of insulator proteins to the nuclear matrix.

FBrf0222846-2.coIP.WB
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait

Myc tag

CTCF 

dCTCF

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
PBZ motif
mutation decreasing interaction
aa 566

K566A

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 endogenous gene..

Several insulator proteins examined (Cp190, su(Hw), mod(mdg4) and CTCF) are PARylated in S2 cells. These proteins are also PARylated in vitro by human PAR polymerase in vitro. Inhibition of PARylation reduces the localization of insulator proteins to the nuclear matrix.

FBrf0224437-7.coIP.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

TAP tag

CTCF 

CTCF

prey

2 peptides identified

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 endogenous gene.

TAP tandem affinity purification of bait and identification of prey by mass spectrometry.

FBrf0226362-16.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

FLAG tag

Cp190

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 nuclear extract of S2 cell line; bait produced from transfected construct or endogenous gene; prey produced from endogenous gene.

FBrf0226362-8.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait

FLAG tag

CTCF 

CTCF

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 nuclear extract of S2 cell line; bait produced from transfected construct or endogenous gene; prey produced from endogenous gene.

FBrf0227255-19.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

fused to GAL4 DNA-binding domain

CTCF 

CTCF

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

Positive control.

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

FBrf0227255-2.coIP.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

FLAG tag

CTCF 

CTCF

prey

11 unique peptides

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

CTCF enriched 12-fold in Cp190 purification compared to negative control.

Source was cell extract of S2 cell line; bait produced from transfected construct; prey produced from endogenous gene.

FBrf0229205-4.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

His tag

CTCF 

dCTCF

prey

GST tag

CTCF 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
CP190 interaction module
sufficient binding region
aa 612-818

coordinates relative to CTCF-PA

CTCF interaction module
sufficient binding region
aa 1-126

coordinates relative to Cp190-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 as a recombinant fusion protein in bacterial system.

FBrf0229205-5.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

dCTCF

bait

GST tag

CTCF 

CP190

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
CP190 interaction module
sufficient binding region
aa 612-818

coordinates relative to CTCF-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 derived from S2 nuclear extract.

The CTCF C-terminal region pulls down Cp190 but not Trl.

FBrf0229205-6.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait
CTCF 

dCTCF

prey

FLAG tag

CTCF 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
CP190 interaction module
necessary binding region
aa 610-818

coordinates relative to CTCF-PA

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

Source was cell extract of S2 cell line; bait produced from endogenous gene; prey produced from transfected construct.

FBrf0229205-7.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

fused to GAL4 DNA-binding domain

CTCF 

dCTCF

prey

fused to GAL4 activation domain

CTCF 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
CP190 interaction module
sufficient binding region
aa 612-818

coordinates relative to CTCF-PA

CTCF interaction module
sufficient binding region
aa 1-166

coordinates relative to Cp190-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

FBrf0238614-1.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait
CTCF 

dCTCF

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
putative phosphorylation sites
mutation increasing interaction
aa 233,392

S233A,S392A

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

Source was adult flies of transgenic fly line; bait produced from transgenic construct; prey produced from endogenous gene.

FBrf0248103-3.PD.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

GFP tag

CTCF 

Cp190

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
N-terminal domain
sufficient binding region
aa 1-293

coordinates relative to CTCF-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 derived from wild-type embryonic extract.

FBrf0248103-4.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

GFP tag

CTCF 

Cp190

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
C-terminal domain
sufficient binding region
aa 698-771

coordinates relative to CTCF-PA

BTB domain
sufficient binding region
aa 1-123

coordinates relative to Cp190-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 as a recombinant fusion protein in bacterial system.

FBrf0250944-1.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

6X His tag

CTCF 

CTCF

prey

GST tag

CTCF 
CTCF 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
C-terminal domain residues 715-733
necessary binding region
aa 715-733

coordinates relative to CTCF-PA

CTCF 
C-terminal domain residues 715-733
sufficient binding region
aa 715-733

coordinates relative to CTCF-PA

BTB domain residues 1-126
sufficient binding region
aa 1-126

coordinates relative to Cp190-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 as a recombinant fusion protein in bacterial system

FBrf0250944-2.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

GST tag

CTCF 
CTCF 

CP190

prey

6X His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
delta C-terminal domain residues 715-733
necessary binding region
aa 715-733

coordinates relative to CTCF-PA

CTCF 
C-terminal domain residues 715-733
sufficient binding region
aa 715-733

coordinates relative to CTCF-PA

BTB domain residues 1-126
sufficient binding region
aa 1-126

coordinates relative to Cp190-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 as a recombinant fusion protein in bacterial system

FBrf0250944-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

6X His tag

CTCF 

CTCF

prey

GST tag

CTCF 
CTCF 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
C-terminal domain residues 715-733
necessary binding region
aa 715-733

coordinates relative to CTCF-PA

CTCF 
C-terminal domain residues 723-774
sufficient binding region
aa 723-774

coordinates relative to CTCF-PA

M domain residues 245-606
sufficient binding region
aa 245-606

coordinates relative to Cp190-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 as a recombinant fusion protein in bacterial system

FBrf0250944-4.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

GST tag

CTCF 
CTCF 

CP190

prey

6X His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
delta C-terminal domain residues 715-733
necessary binding region
aa 715-733

coordinates relative to CTCF-PA

CTCF 
C-terminal domain residues 723-774
sufficient binding region
aa 723-774

coordinates relative to CTCF-PA

M domain residues 245-606
sufficient binding region
aa 245-606

coordinates relative to Cp190-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 as a recombinant fusion protein in bacterial system

FBrf0250944-5.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait
CTCF 

CTCF

prey

3X HA tag

CTCF 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
delta C-terminal residues 705-733
necessary binding region
aa 705-733

coordinates relative to CTCF-PA

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.

FBrf0251881-8.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

fused to GAL4 DNA-binding domain

CTCF 

dCTCF

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
BTB interaction domain residues 1-126
sufficient binding region
aa 1-126

coordinates relative to Cp190-PA.

M interaction domain residues 309-470
sufficient binding region
aa 309-470

coordinates relative to Cp190-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 from cDNA library of 154 Drosophila C2H2 domain proteins).

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

FBrf0253430-1.PD.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

GFP tag

CTCF 

Cp190

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
N terminal domain
sufficient binding region
aa 1-293

coordinates relative to CTCF-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 derived from wild-type, nuclear embryonic extract.

FBrf0253430-39.PD.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait

GFP tag

CTCF 

CTCF

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

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

FBrf0253430-57.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
CTCF 

CTCF

bait

GFP tag

CTCF 

Cp190

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
CTCF 
C terminal domain
sufficient binding region
aa 610-818

coordinates relative to CTCF-PA

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.

FBrf0258035-6.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Cp190

bait

fused to GAL4 DNA-binding domain

CTCF 

dCTCF

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
BTB domain
sufficient binding region
aa 1-126

within the context of aa 1-293; coordinates relative to Cp190-PA

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

Two-hybrid system: yeast GAL4-BD/VP16-AD

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

FBrf0259958-2.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

CP190

bait

fused to GAL4 DNA-binding domain

CTCF 

dCTCF

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
interaction domain
sufficient binding region
aa 1-220

coordinates relative to Cp190-PA

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

Positive control.

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).

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (15)