FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000103844
Interaction Network
Interactions Browser links
cnn network
Reported Interactions
FBrf0224572-1.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

bait

fused to GAL4 DNA-binding domain

cnn 

Cnn

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

Multiple regions of cnn can self-interact.

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

FBrf0229797-2.coIP.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

bait

GFP tag

cnn 

Cnn

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 transgenic fly line; bait produced from transgenic gene; prey produced from endogenous gene.

FBrf0233282-89.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

bait

fused to GAL4 DNA-binding domain

cnn 

Cnn

prey

fused to GAL4 activation domain

cnn 
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
N-terminal region
sufficient binding region
aa 1-365

coordinates relative to cnn-PA

cnn 
central region
sufficient binding region
aa 366-697

coordinates relative to cnn-PA

cnn 
C-terminal region
sufficient binding region
aa 698-1148

coordinates relative to cnn-PA

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 N-terminal region of cnn homodimerizes. The central and C-terminal regions of cnn bind to the each other.

FBrf0236126-1.CH.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

self
cnn 

Cnn

self
cnn 
cnn 
cnn 
cnn 
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
LZ domain
sufficient binding region
aa 490-544
cnn 
LZ domain residue 528
mutation decreasing interaction
aa 528

L528E

cnn 
LZ domain residue 532
mutation decreasing interaction
aa 532

L532E

cnn 
LZ domain residue 535
mutation decreasing interaction
aa 535

L535E

cnn 
LZ domain residue 539
mutation decreasing interaction
aa 539

L539E

cnn 
LZ domain residue 542
mutation decreasing interaction
aa 542

L542E

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.

The LZ domain forms a tetramer in solution.

FBrf0236126-2.CH.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

self
cnn 

Cnn

self
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
CM2 domain
sufficient binding region
aa 1082-1148
cnn 
CM2 domain
mutation decreasing interaction
aa 1082,1084

H1082A,C1084A

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.

The CM2 domain forms a dimer in solution.

FBrf0236126-3.CH.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

self
cnn 

Cnn

self
cnn 
cnn 
cnn 
cnn 
cnn 
cnn 
cnn 
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
LZ domain
sufficient binding region
aa 490-544
cnn 
CM2 domain
sufficient binding region
aa 1082-1148
cnn 
LZ domain residue 528
mutation decreasing interaction
aa 528

L528E

cnn 
LZ domain residue 532
mutation decreasing interaction
aa 532

L532E

cnn 
LZ domain residue 539
mutation decreasing interaction
aa 539

L539E

cnn 
LZ domain residue 542
mutation decreasing interaction
aa 542

L542E

cnn 
CM2 domain residue 1126
mutation decreasing interaction
aa 1126

I1126E

cnn 
CM2 domain residue 1133
mutation decreasing interaction
aa 1133

T1133E

cnn 
CM2 domain residue 1137
mutation decreasing interaction
aa 1137

L1137E

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.

A mixture of LZ and CM2 forms a 2:2 hetero-tetrameric complex.

FBrf0236126-4.XC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

self
cnn 

Cnn

self
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
LZ domain
sufficient binding region
aa 490-544
cnn 
CM2 domain
sufficient binding region
aa 1082-1148
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.

The LZ and CM2 domains of cnn form a 2:2 hetero-tetrameric complex. In the absence of LZ domain, CM2 domain homodimers can interact in anti-parallel to form a tetramer in crystallo.

FBrf0236126-5.CH.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

self
cnn 

Cnn

self
cnn 
cnn 
cnn 
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
PReM domain
sufficient binding region
aa 403-608

PReM domain includes the LZ domain and additional N- and C-terminal extensions.

cnn 
CM2 domain
sufficient binding region
aa 1082-1148
cnn 
CM2 domain residue 1126
mutation decreasing interaction
aa 1126

I1126E

cnn 
CM2 domain residue 1133
mutation decreasing interaction
aa 1133

T1133E

cnn 
CM2 domain residue 1137
mutation decreasing interaction
aa 1137

L1137E

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.

Unlike the smaller LZ domain, the PReM domain forms a homodimer in solution rather than a tetramer, while a mixture of PReM and CM2 forms much larger complex than the LZ-CM2 hetero-tetrameric complex.

FBrf0237751-1.CH.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

neutral component
cnn 

Cnn

neutral component
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
CM2 domain
sufficient binding region
aa 1064-1129aa 1074-1148

coordinates relative to cnn-PA

coordinates relative to cnn-PA

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

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

The estimated molecular weights are consistent with dimers.

FBrf0237751-3.Y2H
Description
physical association
Assay
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

CNN

bait

fused to GAL4 DNA-binding domain

cnn 

CNN

prey

fused to GAL4 activation domain

cnn 
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
CM2 domain
sufficient binding region
aa 1087-1148

coordinates relative to cnn-PA

cnn 
interaction domain
sufficient binding region
aa 454-556

coordinates relative to cnn-PA

cnn 
CM2 domain residues 1131,1137
mutation disrupting interaction
aa 1131,1137

L1131A,L1137A, coordinates relative to cnn-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

FBrf0237751-4.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnn 

Cnn

neutral component
cnn 

Cnn

neutral component
cnn 
cnn 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnn 
interaction domain
sufficient binding region
aa 490-567

coordinates relative to cnn-PA

cnn 
CM2 domain
sufficient binding region
aa 1090-1148

coordinates relative to cnn-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.

External Crossreferences and Linkouts ( 0 )
References (5)