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
FBig0000104264
Interaction Network
Interactions Browser links
Orc4 network
Orc2 network
Reported Interactions
FBrf0227879-22.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc4 

Orc4

bait

MBP tag

Orc2 

Orc2

prey
Orc2 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Orc2 
interaction domain
sufficient binding region
aa 266-618
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

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

FBrf0227879-7.XC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc2 
Orc2 

Orc2

neutral component
Orc2 
Orc4 

Orc4

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Orc2 
interaction domain
sufficient binding region
aa 266-618
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.

FBrf0232523-22.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc2 

Orc2

bait
Orc4 

Orc4

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.

FBrf0232523-33.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc4 

Orc4

bait
Orc2 

Orc2

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.

FBrf0232630-14.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc4 

ORC4

bait

MBP tag

Orc2 

ORC2

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

Orc1, Orc2, Orc3, MBP-Orc4, Orc5 and His-Orc6 were co-infected

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

FBrf0239330-18.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

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.

FBrf0239330-4.CL.MS
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

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.

FBrf0246581-19.EM
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc2 

Orc2

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

neutral component
Orc4 

Orc4

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 a baculovirus and insect cell system.

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.

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