FB2026_03 , released September 17, 2026
Physical Interaction report
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General Information
Interaction Type
Interacting Genes
FlyBase ID
FBig0000101765
Interaction Network
Interactions Browser links
Syt1 network
Reported Interactions
FBrf0134720-3.PD.MW
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Syt1 

synaptotagmin I

bait

GST tag

Syt1 

synaptotagmin I

prey
Syt1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Syt1 
C2B domain
mutation decreasing interaction
364

Y364N

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

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

FBrf0218619-3.PD.WB
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Syt1 

Syt1

bait

GST tag

Syt1 

Syt1

prey

MBP tag

Syt1 
Syt1 
Syt1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Syt1 
C2B domain
sufficient binding region
aa 320-474

coordinates relative to Syt1-PA

Syt1 
C2B domain
mutation decreasing interaction
aa 320-383

coordinates relative to Syt1-PA

Syt1 
C2B domain
mutation increasing interaction
aa 454-474

coordinates relative to Syt1-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.

Binding enhanced by the addition of Ca2+. Syt1 mutation D414N,D416N abolishes enhanced binding with Ca2+.

FBrf0220424-1.PD.WB
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Syt1 

C2A-C2B

bait

GST tag

Syt1 

Syt1

prey

GFP tag

Syt1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Syt1 
C2 domains
sufficient binding region
aa 189-432

\'C2A-C2B\'

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 derived from transgenic adult male head extract.

Syt1 multimerization occurred in the absence of Ca[2+], but was greatly enhanced in the presence of 1 mM or 10mM Ca[2+].

Mutation of C2 domain Asp residues involved in the binding of Ca[2+] did not disrupt the Ca[2+] enhanced multimerization of Syt1 : D282N and D284N in the C2A domain, and D416N and D418N in the C2B domain.

FBrf0220424-2.PD.WB
Reference
Description
physical association
Collection
Source/Stage
Cell line used
Participants
Corresponds to
Reported as
Role
Note
Syt1 

C2A-C2B

bait

GST tag

Syt1 

Syt1

prey

His tag

Syt1 
Experimental entities
Corresponds to
Identifier
Reported
Role
Note
Subregions with role in interaction
Corresponds to
Description
Role
Coordinates
Note
Syt1 
C2 domains
sufficient binding region
aa 189-432

\'C2A-C2B\'

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.

Syt1 multimerization occurred in the absence of Ca[2+], but was greatly enhanced in the presence of 1 mM or 10mM Ca[2+].

Mutation of C2 domain Asp residues involved in the binding of Ca[2+] did not disrupt the Ca[2+] enhanced multimerization of Syt1 : D282N and D284N in the C2A domain, and D416N and D418N in the C2B domain.

External Crossreferences and Linkouts ( 0 )
References (3)