Annotations: 4DLQ

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Full GAIN domain-like	8045675	4004608	SCOP2 (2022-06-29)
A	SCOP2 Family	Hormone receptor domain	8049574	4003045	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	ZU5 domain-like	8091399	3002026	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	FnI-like domain	8091400	3000979	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	GAIN	e4dlqA3	A: alpha superhelices	X: Repetitive alpha hairpins	H: GPCR-autoproteolysis inducing domain subdomain A (From Topology)	T: GPCR-autoproteolysis inducing domain subdomain A	F: GAIN	ECOD (1.6)
A	HRM_1	e4dlqA2	A: few secondary structure elements	X: Hormone receptor domain (HRM, Pfam 02793) (From Topology)	H: Hormone receptor domain (HRM, Pfam 02793) (From Topology)	T: Hormone receptor domain (HRM, Pfam 02793)	F: HRM_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	4.10.1240.10	Few Secondary Structures	Irregular	Hormone receptor fold	GPCR, family 2, extracellular hormone receptor domain	CATH (4.3.0)
A	1.25.40.610	Mainly Alpha	Alpha Horseshoe	Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat		CATH (4.3.0)
A	2.60.220.50	Mainly Beta	Sandwich	Chondroitinase Ac	Chain A, domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01825	GPCR proteolysis site, GPS, motif (GPS)	GPCR proteolysis site, GPS, motif	-	Motif
A	PF02793	Hormone receptor domain (HRM)	Hormone receptor domain	-	Family
A	PF16489	GPCR-Autoproteolysis INducing (GAIN) domain (GAIN)	GPCR-Autoproteolysis INducing (GAIN) domain	The GAIN a domain of alpha-helices and beta-strands that is found in cell-adhesion GPCRs and precedes the GPS motif where the autoproteolysis occurs, family, Pfam:PF01825. The full GAIN domain, comprises the GPS and the GAIN, in cell-adhesion GPCRs, ...	The GAIN a domain of alpha-helices and beta-strands that is found in cell-adhesion GPCRs and precedes the GPS motif where the autoproteolysis occurs, family, Pfam:PF01825. The full GAIN domain, comprises the GPS and the GAIN, in cell-adhesion GPCRs, and is the functional unit for autoproteolysis. The GPS motif at the end of the GAIN domain is an ancient domain that exists in primitive ancestor organisms, and the full GAIN + GPS is conserved in all cell-adhesion GPCRs and all PKD1-related proteins [1].	Domain
B	PF01825	GPCR proteolysis site, GPS, motif (GPS)	GPCR proteolysis site, GPS, motif	-	Motif

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Latrophilin-1	molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity cell adhesion molecule binding protein binding binding latrotoxin receptor activity toxic substance binding carbohydrate binding	positive regulation of nervous system development multicellular organismal process positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization regulation of developmental process positive regulation of biological process regulation of nervous system development positive regulation of developmental process cellular component organization cellular component biogenesis multicellular organism development cellular component assembly cell junction assembly anatomical structure development positive regulation of nervous system development multicellular organismal process positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization regulation of developmental process positive regulation of biological process regulation of nervous system development positive regulation of developmental process cellular component organization cellular component biogenesis multicellular organism development cellular component assembly cell junction assembly anatomical structure development regulation of multicellular organismal process regulation of synapse structure or activity synapse organization cellular component organization or biogenesis regulation of synapse assembly regulation of biological quality positive regulation of cellular process system development developmental process regulation of multicellular organismal development regulation of biological process positive regulation of cellular component biogenesis biological regulation nervous system development regulation of cellular component biogenesis regulation of cell junction assembly positive regulation of cell junction assembly regulation of synapse organization cell junction organization positive regulation of multicellular organismal process cellular process synapse assembly positive regulation of synapse assembly developmental maturation synapse maturation regulation of synapse maturation positive regulation of synapse maturation heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules cell adhesion cell-cell adhesion cell-cell adhesion via plasma-membrane adhesion molecules cellular response to stimulus response to stimulus signaling adenylate cyclase-activating G protein-coupled receptor signaling pathway cell communication adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction cell surface receptor signaling pathway	cell periphery plasma membrane membrane cellular anatomical entity presynapse synapse cell junction presynaptic membrane plasma membrane region synaptic membrane growth cone axon cell projection distal axon cell periphery plasma membrane membrane cellular anatomical entity presynapse synapse cell junction presynaptic membrane plasma membrane region synaptic membrane growth cone axon cell projection distal axon neuron projection plasma membrane bounded cell projection site of polarized growth glutamatergic synapse
B	Latrophilin-1	molecular transducer activity G protein-coupled receptor activity transmembrane signaling receptor activity signaling receptor activity cell adhesion molecule binding protein binding binding latrotoxin receptor activity toxic substance binding carbohydrate binding	positive regulation of nervous system development multicellular organismal process positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization regulation of developmental process positive regulation of biological process regulation of nervous system development positive regulation of developmental process cellular component organization cellular component biogenesis multicellular organism development cellular component assembly cell junction assembly anatomical structure development positive regulation of nervous system development multicellular organismal process positive regulation of cellular component organization regulation of cellular process regulation of cellular component organization regulation of developmental process positive regulation of biological process regulation of nervous system development positive regulation of developmental process cellular component organization cellular component biogenesis multicellular organism development cellular component assembly cell junction assembly anatomical structure development regulation of multicellular organismal process regulation of synapse structure or activity synapse organization cellular component organization or biogenesis regulation of synapse assembly regulation of biological quality positive regulation of cellular process system development developmental process regulation of multicellular organismal development regulation of biological process positive regulation of cellular component biogenesis biological regulation nervous system development regulation of cellular component biogenesis regulation of cell junction assembly positive regulation of cell junction assembly regulation of synapse organization cell junction organization positive regulation of multicellular organismal process cellular process synapse assembly positive regulation of synapse assembly developmental maturation synapse maturation regulation of synapse maturation positive regulation of synapse maturation heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules cell adhesion cell-cell adhesion cell-cell adhesion via plasma-membrane adhesion molecules cellular response to stimulus response to stimulus signaling adenylate cyclase-activating G protein-coupled receptor signaling pathway cell communication adenylate cyclase-modulating G protein-coupled receptor signaling pathway G protein-coupled receptor signaling pathway signal transduction cell surface receptor signaling pathway	cell periphery plasma membrane membrane cellular anatomical entity presynapse synapse cell junction presynaptic membrane plasma membrane region synaptic membrane growth cone axon cell projection distal axon cell periphery plasma membrane membrane cellular anatomical entity presynapse synapse cell junction presynaptic membrane plasma membrane region synaptic membrane growth cone axon cell projection distal axon neuron projection plasma membrane bounded cell projection site of polarized growth glutamatergic synapse

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR017983	GPCR, family 2, secretin-like, conserved site	Conserved Site
A	IPR032471	GAIN domain, N-terminal	Domain
A	IPR036445	GPCR family 2, extracellular hormone receptor domain superfamily	Homologous Superfamily
A	IPR000832	GPCR, family 2, secretin-like	Family
A	IPR043159	D-galactoside/L-rhamnose binding SUEL lectin domain superfamily	Homologous Superfamily
A	IPR000203	GPS motif	Conserved Site
A	IPR003112	Olfactomedin-like domain	Domain
A	IPR031234	Latrophilin-1, , transmembrane domain	Domain
A	IPR017981	GPCR, family 2-like, 7TM	Domain
A	IPR003924	GPCR, family 2, latrophilin	Family
A	IPR001879	GPCR, family 2, extracellular hormone receptor domain	Domain
A	IPR003334	GPCR, family 2, latrophilin, C-terminal	Domain
A	IPR000922	D-galactoside/L-rhamnose binding SUEL lectin domain	Domain
A	IPR046338	GAIN domain superfamily	Homologous Superfamily
B	IPR017983	GPCR, family 2, secretin-like, conserved site	Conserved Site
B	IPR032471	GAIN domain, N-terminal	Domain
B	IPR036445	GPCR family 2, extracellular hormone receptor domain superfamily	Homologous Superfamily
B	IPR000832	GPCR, family 2, secretin-like	Family
B	IPR043159	D-galactoside/L-rhamnose binding SUEL lectin domain superfamily	Homologous Superfamily
B	IPR000203	GPS motif	Conserved Site
B	IPR003112	Olfactomedin-like domain	Domain
B	IPR031234	Latrophilin-1, , transmembrane domain	Domain
B	IPR017981	GPCR, family 2-like, 7TM	Domain
B	IPR003924	GPCR, family 2, latrophilin	Family
B	IPR001879	GPCR, family 2, extracellular hormone receptor domain	Domain
B	IPR003334	GPCR, family 2, latrophilin, C-terminal	Domain
B	IPR000922	D-galactoside/L-rhamnose binding SUEL lectin domain	Domain
B	IPR046338	GAIN domain superfamily	Homologous Superfamily