FB2026_02 , released June 18, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000099619
Interaction Network
Interactions Browser links
Asciz network
ctp network
Reported Interactions
FBrf0224097-1.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

bait

GST tag

ctp 

Ctp

prey

His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
SQ/TQ cluster domain
sufficient binding region
aa 241-388

\'SCD\'

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.

The human orthologs of CG14962 (ASCIZ) and ctp (Dynein light chain) also interact in this assay.

FBrf0234065-4.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ctp 

Cut up

bait

MBP tag

Digitor

prey

His tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
SCD domain
sufficient binding region
aa 256-388

coordinates relative to Asciz-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.

FBrf0234065-5.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Digitor

bait

His tag

ctp 

Cut up

prey

MBP tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
SCD domain
sufficient binding region
aa 256-388

coordinates relative to Asciz-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.

FBrf0239018-1.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

bait
ctp 

LC8

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
LC8 binding domain
sufficient binding region
aa 241-388

Stoichiometry 1:7- two chains of Asciz LC8 binding domain to 7 ctp (LC8) dimers. Kd = 1.4uM.

QT1-3 domain
sufficient binding region
aa 241-324

Stoichiometry 1:3 . Kd = 2.4uM.

QT2-4 domain
sufficient binding region
aa 271-341

Stoichiometry 1:3 . Kd = 4.1uM.

QT4-6 domain
sufficient binding region
aa 321-376

Stoichiometry 1:3 . Kd = 1.0uM.

QT4-7 domain
sufficient binding region
aa 321-388

Stoichiometry 1:4 . Kd = 1.6uM.

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.

FBrf0239018-2.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ctp 

LC8

bait

dASCIZ

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT1 domain
sufficient binding region
YMSSQKLDMETQTEE
QT2 domain
sufficient binding region
YLAPLLRDIETQTPD
QT4 domain
sufficient binding region
DLQTSAHMYTQTCD
QT5 domain
sufficient binding region
EELGLSHIQTQTHW
QT6 domain
sufficient binding region
WPDGLYNTQHTQTCD
QT7 domain
sufficient binding region
EPDNFQSTCTQTRW
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 peptides commercially synthesized.

FBrf0239018-3.CS.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

neutral component

dASCIZ

neutral component

dASCIZ

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
LC8 binding domain
sufficient binding region
aa 241-388
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.

In addition to a 1:7 complex, AUC profiles reveal smaller sub-saturated species which are favored relative to the high-occupancy complex even with an excess of ctp.

FBrf0239018-4.CM.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

neutral component

dASCIZ

neutral component

dASCIZ

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
LC8 binding domain
sufficient binding region
aa 241-388
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.

With increasing concentrations of ctp, a smear of higher order complexes appears.

FBrf0239018-5.XS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

neutral component

dASCIZ

neutral component

dASCIZ

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
LC8 binding domain
sufficient binding region
aa 241-388
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.

FBrf0239018-6.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

neutral component

dASCIZ

neutral component

dASCIZ

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
LC8 binding domain
sufficient binding region
aa 241-388
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.

Predominantly 1:2-1:4 complexes visualized.

FBrf0239018-7.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

dASCIZ

neutral component

dASCIZ

neutral component

dASCIZ

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
LC8 binding domain
sufficient binding region
aa 241-388
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.

FBrf0247510-1.CS.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component

ASCIZ

neutral component

ASCIZ

neutral component

ASCIZ

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT2-4
sufficient binding region
aa 270-340
QT2
mutation decreasing interaction
aa 282-284

TQT to AAA, coordinates relative to Asciz-PA

QT3
mutation decreasing interaction
aa 293-295

TMT to AAA, coordinates relative to Asciz-PA

QT4
mutation decreasing interaction
aa 331-333

TQT to AAA, coordinates relative to Asciz-PA

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

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

FBrf0247510-2.ESI.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component

ASCIZ

neutral component

ASCIZ

neutral component

ASCIZ

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT2-4
sufficient binding region
aa 270-340
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Four types of Asciz-ctp complexes detected with stoichiometries of 1:2 , 1:4 , 2:6 , 2:8 with 2:6 being most stable.

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

FBrf0247510-3.NMR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component

ASCIZ

neutral component

ASCIZ

neutral component

ASCIZ

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT2-4
sufficient binding region
aa 270-340
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

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

FBrf0256103-1.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Asciz

bait
ctp 

LC8

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT2-4 interaction domain residues 270-340
sufficient binding region
aa 270-340

coordinates relative to Asciz-PA

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

Multiple single and combination Asciz QT domains were tested to determine order and stability of binding to ctp. QT domains were replaced with AAA residues within the context of QT-4 for the different combinations.

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

FBrf0256103-2.CS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Asciz

neutral component

Asciz

neutral component

Asciz

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
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 recombinant fusion proteins in bacterial system.

Multiple combinations Asciz QT domains were tested to determine order and stability of binding to ctp. QT domains were replaced with AAA residues within the context of QT-4 aa 270-340, for the different combinations. QT2,3 bound most efficiently and QT2,4 bound earliest.

FBrf0256103-4.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Asciz

neutral component

Asciz

neutral component

Asciz

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
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 recombinant fusion proteins in bacterial system.

Asciz QT domain 2,3 interacts with 2 ctp dimers most abundantly. QT domains 2,4 and 3,4 interact with one ctp dimer most abundantly.

FBrf0256103-6.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Asciz

neutral component

Asciz

neutral component

Asciz

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT2-4 interaction domain residues 270-340
sufficient binding region
aa 270-340

coordinates relative to Asciz-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.

ctp forms dimers, 3mers and 4mers; dimers most abundantly interact with Asciz QT-4 domains.

FBrf0256103-7.CH.LS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Asciz

neutral component

Asciz

neutral component

Asciz

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
ctp 

LC8

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
QT2-4 interaction domain residues 270-340
sufficient binding region
aa 270-340

coordinates relative to Asciz-PA

QT4-6 interaction domain residues 298-375
sufficient binding region
aa 298-375

coordinates relative to Asciz-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 (5)