FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000097528
Interaction Network
Interactions Browser links
α-Spec network
β-Spec network
Reported Interactions
FBrf0046639-1.CH.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

234 kDa spectrin subunit

neutral component

234 kDa spectrin subunit

neutral component

234 kDa spectrin subunit

neutral component

226 kDa spectrin subunit

neutral component

226 kDa spectrin subunit

neutral component

226 kDa spectrin 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

High speed supernatant of S3 cell lysates was fractionated over a DEAE Sephacel column, concentrated by ammonium sulfate precipitation, and resolubilized for gel filtration. This yielded a purified fraction containing both the 234 kDa and 226 kDa spectrin subunits.

Source was S3 cell line; bait produced from endogenous gene; prey produced from endogenous gene.

FBrf0077251-1.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

&bgr-spectrin

bait

&agr-spectrin

prey

[35]S label

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
segments 20-22
sufficient binding region
segments 1-3
sufficient binding region
Isoform-specific participants
Corresponds to
Description
Role
Note
Comments concerning this interaction

Interaction in vitro; bait produced by in vitro translation; prey produced and labeled by in vitro translation.

FBrf0131399-10.coIP.WB
Description
physical association
Collection
Cell line used
Participants
Corresponds to
Reported as
Role
Note

α-Spectrin

bait

β-Spectrin

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.

FBrf0227259-1.CH.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

α

neutral component

α

neutral component

α

neutral component

β

neutral component

β

neutral component

β

neutral component
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
N-terminal region
sufficient binding region
aa 2-152

"α 0-1" construct, coordinates relative to α-Spec-PA

C-terminal region
sufficient binding region
aa 1911-2093

"β 16-17" construct, coordinates relative to β-Spec-PA

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

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

FBrf0227259-3.ITC
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

β

bait

α

prey
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
N-terminal region
sufficient binding region
aa 2-152

"α 0-1" construct, coordinates relative to α-Spec-PA

C-terminal region
sufficient binding region
aa 1911-2093

"β 16-17" construct, coordinates relative to β-Spec-PA

N-terminal region residue R22
mutation disrupting interaction
aa 22

R22S, coordinates relative to α-Spec-PA

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.

Kd = 14 nM (at 23oC).

FBrf0252562-1.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

α-spectrin

bait

β-spectrin

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 adult heads of transgenic fly line; bait produced from endogenous gene; prey produced from endogenous gene.

Positive control; transgenic flies contain only GAL4 without a UAS construct.

FBrf0252562-2.coIP.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note

α-spectrin

bait

β-spectrin

prey

GFP tag

Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
interaction domain residues 45-terminus
sufficient binding region
aa 45-terminus

aa 1-44 not necessary for interaction. Isoform not specified.

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

Source was adult heads of transgenic fly line; bait produced from endogenous gene; prey produced from tagged transgenic construct.

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