FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000115965
Interaction Network
Interactions Browser links
cnk network
ksr network
Reported Interactions
FBrf0224702-250.coIP.MS
Description
physical association
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ksr 

ksr

bait

TAP tag

cnk 

cnk

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.

Overall SAINT probability of interaction = 1.

FBrf0260095-12.CH.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ksr 

Ksr

neutral component

His-GST tag

ksr 
ksr 
ksr 

Ksr

neutral component

His-GST tag

ksr 
ksr 
ksr 

Ksr

neutral component

His-GST tag

cnk 
cnk 
cnk 
cnk 

CNK

neutral component

GST tag

cnk 

CNK

neutral component

GST tag

cnk 
cnk 
cnk 
cnk 

CNK

neutral component

GST tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnk 
PDZ-CRIC linker domain residue 197
mutation decreasing interaction
aa 197

within the context of aa aa 2-330; M197E; coordinates relative to cnk-PA

cnk 
PDZ-CRIC linker domain residue 195
mutation decreasing interaction
aa 195

within the context of aa 2-330; D195K; coordinates relative to cnk-PA

cnk 
PDZ-CRIC linker domain residue 198
mutation decreasing interaction
aa 198

within the context of aa 2-330; V198E; coordinates relative to cnk-PA

ksr 
C-lobe base domain residue 902
mutation decreasing interaction
aa 902

within the context of aa 654-966; M902D; coordinates relative to ksr-PA

ksr 
C-lobe base domain residue 925
mutation decreasing interaction
aa 925

within the context of aa 654-966; Y925D; coordinates relative to ksr-PA

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

Purified ave-cnk heterodimer was mixed with an equimolar ratio of ksr-Dsor1 heterodimer, which eluted as a higher order complex as series of binary interactions that do not necessarily indicate direct protein-protein contact. Mutations in cnk or ksr interfere with the higher order cnk-ave-ksr-Dsor1 complex.

Interaction in vitro; ksr produced as a recombinant fusion protein in baculovirus and insect cell system; cnk produced as a recombinant fusion protein in bacterial cell system.

FBrf0260095-17.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ksr 

Ksr

bait

V5 tag

ksr 
ksr 
ksr 
cnk 

CNK

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
ksr 
C-lobe base domain residue 896
mutation decreasing interaction
aa 896

W896R; coordinates relative to ksr-PA

ksr 
C-lobe base domain residue 902
mutation decreasing interaction
aa 902

M902D; coordinates relative to ksr-PA

ksr 
C-lobe base domain residue 903
mutation decreasing interaction
aa 903

M903D; coordinates relative to ksr-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 endogenous gene.

FBrf0260095-2.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
cnk 

CNK

bait

GST tag

cnk 
ksr 

KSR

prey

V5 tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
cnk 
SAM and CRIC domains
sufficient binding region
aa 2-209

coordinates relative to cnk-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.

Co-expression of ave and Dsor1 increase cnk-ksr interaction with cnk aa 2-549 and 2-384 constructs, but not aa 2-209 which lacks the PDZ domain.

FBrf0260095-20.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ksr 

Ksr

neutral component

His-GST tag

ksr 
ksr 

Ksr

neutral component

His-GST tag

ksr 
ksr 

Ksr

neutral component

His-GST tag

cnk 
cnk 

CNK

neutral component

GST tag

cnk 

CNK

neutral component

GST tag

cnk 
cnk 

CNK

neutral component

GST tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
ksr 
Kinase domain
sufficient binding region
aa 654-966
cnk 
SAM-CRIC-PDZ domains
sufficient binding region
aa 2-330

coordinates relative to cnk-PA

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

cryoEM structure of ave-cnk-ksr-Dsor1 complex captured as a series of binary interactions that are not all direct. cryoEM indicates direct interaction between ave-cnk, ksr-Dsor1, cnk-ksr and cnk-Dsor1.

Interaction in vitro; ksr produced as a recombinant fusion protein in a baculovirus and insect system; cnk produced as a recombinant protein in bacterial system.

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