FB2026_02 , released June 18, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000098380
Interaction Network
Interactions Browser links
Iswi network
Acf network
Reported Interactions
FBrf0095281-1.CH.MW
Reference
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

p170

neutral component
Acf 

p170

neutral component
Acf 

p170

neutral component
Iswi 

p140

neutral component
Iswi 

p140

neutral component
Iswi 

p140

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

Nuclear extract was purified through several different chromatographic steps, selecting for chromatin assembly and remodeling activity.

Iswi and Acf1 copurify as the ACF complex with an apparent molecular mass of 220 kDa.

Identity of p140 as Iswi confirmed by western blot and mass spectrometry. Identity of p170 and p185 bands as Acf1 determined in subsequent publication (FBrf0109981). p47 determined to be a contaminant.

Source was embryonic nuclear extract of wild-type fly line; proteins produced from endogenous genes.

FBrf0097684-2.CH.MS
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

175K subunit

neutral component
Acf 

175K subunit

neutral component
Acf 

175K subunit

neutral component
Iswi 

130K subunit

neutral component
Iswi 

130K subunit

neutral component
Iswi 

130K subunit

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

Nuclear extract was fractionated through several different chromatographic steps, selecting for chromatin remodeling activity.

Iswi, Acf1, Chrac-14 and Chrac-16 interact as part of the approximately 670 kDa CHRAC complex.

Identity of CHRAC subunits determined in this and other publications by mass spectrometry (FBrf0129776, FBrf0138380).

Top2 later shown to be a contaminant that is not part of the CHRAC complex (FBrf0138380).

Source was embryonic nuclear extract of wild-type fly line; proteins produced from endogenous genes.

FBrf0109981-1.CH.MW
Reference
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

p170

neutral component
Acf 

p170

neutral component
Acf 

p170

neutral component
Iswi 

p140

neutral component
Iswi 

p140

neutral component
Iswi 

p140

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

Iswi and Acf1 copurify as the ACF complex.

Identity of p170 and p185 bands as Acf1 by peptide sequencing.

Source was embryonic nuclear extract of wild-type fly line; proteins produced from endogenous genes.

Nuclear extract was purified through several different chromatographic steps, selecting for chromatin assembly and remodeling activity.

FBrf0109981-2.coIP.MW
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Iswi 

Iswi

bait

FLAG tag

Acf 

Acf1

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 baculovirus-infected insect cell line; bait produced from transfected construct; prey produced from transfected construct.

FBrf0138380-1.CH.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

175K subunit

neutral component
Acf 

175K subunit

neutral component
Acf 

175K subunit

neutral component
Iswi 

130K subunit

neutral component
Iswi 

130K subunit

neutral component
Iswi 

130K subunit

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

Iswi, Acf1, Chrac-14 and Chrac-16 interact as part of the approximately 660 kDa CHRAC complex.

Identity of CHRAC subunits determined in this and other publications by mass spectrometry (FBrf0097684, FBrf0129776) and confirmed by western blot.

Top2 later shown to be a contaminant that is not part of the CHRAC complex (FBrf0138380).

Source was embryonic nuclear extract of wild-type fly line; proteins produced from endogenous genes.

Nuclear extract was fractionated through several different chromatographic steps, selecting for chromatin remodeling activity.

FBrf0138380-14.coIP.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Iswi 

ISWI

bait

FLAG tag

Acf 

Acf1

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 baculovirus-infected insect cell line; bait produced from transfected construct; prey produced from transfected construct.

FBrf0138380-9.coIP.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Iswi 

Iswi

bait
Acf 

Acf1

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.

FBrf0182491-1.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

ACF1

bait

FLAG tag

Iswi 

ISWI

prey

GST tag

Iswi 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Iswi 
SANT and SLIDE domains
sufficient binding region
aa 796-991
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced as a recombinant fusion protein in baculovirus-infected Sf9 cell line; prey produced as a recombinant fusion protein in bacterial system.

FBrf0182491-2.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Iswi 

ISWI

bait

FLAG tag

Acf 

ACF1

prey

Myc tag

Acf 
Acf 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Acf 
N-terminal region
sufficient binding region
aa 1-1064
Acf 
DDT domain
necessary binding region
aa 344-410
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Source was cell extract of baculovirus-infected Sf9 cell line; bait produced from transfected construct; prey produced from transfected construct.

FBrf0201622-1.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

ACF1

bait
Iswi 

ISWI

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.

FBrf0201622-3.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

ACF1

bait
Iswi 

ISWI

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.

FBrf0217777-10.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

Acf1

bait
Iswi 

ISWI

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.

Positive control.

FBrf0230177-15.coIP.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Iswi 

ISWI

bait
Acf 

ACF1

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

Positive control.

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

FBrf0230177-19.coIP.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Acf 

ACF1

bait
Iswi 

ISWI

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

Positive control.

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

FBrf0230177-7.coIP.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Iswi 

ISWI

bait
Acf 

ACF1

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.

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (8)