FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000104653
Interaction Network
Interactions Browser links
Orc6 network
Orc5 network
Reported Interactions
FBrf0227879-15.XC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc6 

Orc6

neutral component
Orc6 
Orc6 

Orc6

neutral component
Orc6 

Orc6

neutral component
Orc6 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Orc6 
interaction domain
sufficient binding region
aa 187-257
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

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

Crystal structure of hexameric complex captured as 15 pairwise interactions.

FBrf0227879-20.FPS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc5 

Orc5

bait

MBP, His tag

Orc6 

Orc6

prey

Alexa Fluor 488 label

Orc6 
Orc6 
Orc6 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Orc6 
interaction domain
sufficient binding region
aa 187-257
Orc6 
interaction domain residue 225
mutation decreasing interaction
aa 225

Y225S

Orc6 
interaction domain residue 236
mutation decreasing interaction
aa 236

A236E

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

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

Binding of Orc6 to preassembled Orc1-5 complex captured as 5 pairwise interactions.

FBrf0232523-42.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc5 

Orc5

bait
Orc6 

Orc6

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

Embryonic nuclear extract was treated with DNase and RNase.

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

FBrf0232523-48.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc6 

Orc6

bait
Orc5 

Orc5

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

Embryonic nuclear extract was treated with DNase and RNase.

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

FBrf0232630-9.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc6 

ORC6

bait

MBP tag

Orc5 

ORC5

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

His-Orc1, Orc2, Orc3, Orc4, Orc5 and MBP-Orc6 were co-infected, then purified by sequential His-Orc1 then MBP-Orc6 pull down with additional preparative gel filtration purification.

The Drosophila origin of replication complex (ORC) forms a stable, hexameric complex containing subunits Orc1, Orc2, Orc3, Orc4, Orc5 and Orc6.

Source was cell extract of baculovirus-infected High5 cell line; bait produced from transfected construct; prey produced from transfected construct.

FBrf0239330-26.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc6 

Orc6

neutral component
Orc6 

Orc6

neutral component
Orc6 

Orc6

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

The ORC complex visualized by EM was captured as 15 pairwise interactions. The addition of ATP caused the complex to adopt an active/open conformation.

Interaction in vitro; proteins produced as a recombinant fusion proteins in baculovirus and High5 cell system.

FBrf0239330-8.CL.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc6 

Orc6

neutral component
Orc6 

Orc6

neutral component
Orc6 

Orc6

neutral component
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc5 

Orc5

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 a recombinant fusion proteins in baculovirus and High5 cell system.

FBrf0246581-27.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc5 

Orc5

neutral component
Orc6 

Orc6

neutral component
Orc6 

Orc6

neutral component
Orc6 

Orc6

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

Comparison of EM structures of ORC complex, ORC complex bound to DNA and a ternary complex consisting of ORC, DNA and Cdc6 curated as a series on binary protein-protein interactions.

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

External Crossreferences and Linkouts ( 1 )
Linkouts
MIST - An integrated Molecular Interaction Database
References (5)