FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000098739
Interaction Network
Interactions Browser links
His3 network
Caf1-55 network
Reported Interactions
FBrf0195919-3.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

H3

bait

NURF55

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 peptide source unspecified; prey derived from Nurf complex reconstituted from proteins expressed in a baculovirus and Sf9 cell system.

FBrf0195919-5.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

H3

bait

NURF55

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

Interaction in vitro; bait peptide source unspecified; prey derived from Nurf complex reconstituted from proteins expressed in a baculovirus and Sf9 cell system.

Caf1-55 preferentially binds unmodified His3.

FBrf0205275-3.SPR
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

H3

bait

p55

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; protein produced as a recombinant fusion proteins in baculovirus and Sf9 cell system; His3 source unspecified.

FBrf0213994-10.CS.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

His3

neutral component
His3 

His3

neutral component
His3 

His3

neutral component

Caf1-55

neutral component

Caf1-55

neutral component

Caf1-55

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

His3, His4, Caf1-55 complex reconstituted in vitro and subjected to analytical ultracentrifugation, interaction captured pairwise.

Interaction in vitro; peptide synthesized in vitro; recombinant protein produced in baculovirus and insect cell system.

FBrf0213994-3.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Caf1-55

bait
His3 

His3

prey
His3 
His3 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
His3 
interaction domain
sufficient binding region
aa 1-15

Kd=2μM.

His3 
interaction domain
necessary binding region
aa 1-5
interaction domain residues 322,323
mutation decreasing interaction
aa 322,323

D322N,E323K Kd=8.8μM.

interaction domain residues 235,252,279
mutation disrupting interaction
aa 235,252,279

E235Q,D252K,E279Q Kd>500μM.

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

Interaction in vitro; bait produced as recombinant protein in baculovirus and insect cell system; prey peptide synthesized in vitro.

Trimethylation at His3 K4 disrupts interaction Kd>500μM, trimethylation at His3 K9 decreases interaction Kd=22μM.

FBrf0213994-4.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

His3

bait

crosslinked to beads

Caf1-55

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 peptides synthesized in vitro; prey produced as recombinant protein in baculovirus and insect cell system.

His3, His4 heterodimer used as bait, interaction captured pairwise.

FBrf0213994-7.CH.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

His3

neutral component
His3 

His3

neutral component
His3 

His3

neutral component

Caf1-55

neutral component

Caf1-55

neutral component

Caf1-55

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

His3, His4, Caf1-55 complex reconstituted in vitro and subjected to gel filtration, interaction captured pairwise.

Interaction in vitro; peptide synthesized in vitro; recombinant protein produced in baculovirus and insect cell system.

FBrf0214598-1.FPS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nurf55

bait

His tag

His3 

H3

prey

fluorescein label

His3 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
His3 
interaction domain
sufficient binding region
aa 1-15
interaction domain
mutation disrupting interaction
aa 130aa 183aa 185

E130K

E183K

Y185R

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

Interaction in vitro; bait produced as a recombinant fusion protein in a baculovirus and insect cell system; prey peptide chemically synthesized and labeled in vitro.

His3 binds Caf1-55 and a Caf1-55-Su(z)12 complex similarly suggesting the two interactions are not interdependent. Methylation at K4 of His3 decreases its interaction with a Caf1-55-Su(z)12 complex.

FBrf0214598-2.XC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nurf55

neutral component

His tag

Nurf55

neutral component

His tag

Nurf55

neutral component

His tag

His3 

H3

neutral component
His3 
His3 

H3

neutral component
His3 

H3

neutral component
His3 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
His3 
interaction domain
sufficient binding region
aa 1-19
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

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

FBrf0214598-8.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

Nurf55

bait

His tag

His3 

H3

prey
His3 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
His3 
interaction domain
sufficient binding region
aa 1-15
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced as a recombinant fusion protein in a baculovirus and insect cell system; prey peptide chemically synthesized.

The interaction between His3 and Caf1-55 was probed in the context of a Caf1-55-Su(z)12 complex. Methylation at K4 of His3 decreases its interaction with a Caf1-55-Su(z)12 complex.

FBrf0222105-13.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

Histones

bait

p55

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

The antibody used was raised against purified core histones.

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

External Crossreferences and Linkouts ( 0 )
References (5)