FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000106417
Interaction Network
Interactions Browser links
His3 network
rhi network
Reported Interactions
FBrf0225218-2.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
His3 

H3

bait

biotin tag

His3 
rhi 

Rhino

prey

GST tag

rhi 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
rhi 
chromo-domain
sufficient binding region
aa 1-83

coordinates relative to rhi-PA

His3 
H3K9me3 peptide
sufficient binding region
aa 1-20
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

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

rhi binds only the methylated His3 H3K9me3 peptide, not the unmethylated form.

FBrf0225774-1.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
rhi 

Rhi

neutral component
rhi 

Rhi

neutral component
rhi 
rhi 

Rhi

neutral component
rhi 
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
rhi 
chromodomain
sufficient binding region
His3 
H3K9me3 peptide
sufficient binding region
ARTKQTARKSTGGKA
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.

rhi binds His3 H3K9me3 peptide with Kd = 21.8 uM, and an H3K9me2 peptide with Kd = 28.4 uM, but not H3K9me1 or unmethylated peptide.

FBrf0230463-1.XC
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
rhi 

Rhi

neutral component
rhi 

Rhi

neutral component
rhi 
rhi 

Rhi

neutral component
rhi 
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
rhi 
chromodomain
sufficient binding region
aa 20-90

coordinates relative to rhi-PA

His3 
H3K9me3 peptide
sufficient binding region
KQTARKSTGGK
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

rhi-His3 H3K9me3 peptide complex.

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

FBrf0230463-2.ITC
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
rhi 

Rhi

neutral component
rhi 

Rhi

neutral component
rhi 
rhi 
rhi 
rhi 

Rhi

neutral component
rhi 
rhi 
rhi 
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
rhi 
chromodomain
sufficient binding region
aa 20-90

coordinates relative to rhi-PA

rhi 
chromodomain residue 45
mutation disrupting interaction
aa 45

W45A, coordinates relative to rhi-PA

rhi 
chromodomain residue 48
mutation disrupting interaction
aa 48

F48A, coordinates relative to rhi-PA

His3 
H3K9me3 peptide
sufficient binding region
KQTARKSTGGK
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.

External Crossreferences and Linkouts ( 0 )
References (3)