3TT1 | pdb_00003tt1

Crystal Structure of LeuT in the outward-open conformation in complex with Fab

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: MemProtMD
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
C [auth L]	d3tt1l2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C [auth L]	d3tt1l1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
E [auth M]	d3tt1m2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
E [auth M]	d3tt1m1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
D [auth H]	d3tt1h1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
D [auth H]	d3tt1h2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
F [auth I]	d3tt1i1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
F [auth I]	d3tt1i2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d3tt1a_	Membrane and cell surface proteins and peptides	SNF-like	SNF-like	SNF-like	Na(+):neurotransmitter symporter homologue LeuT	(Aquifex aeolicus ) [TaxId: 63363 ],	SCOPe (2.08)
B	d3tt1b_	Membrane and cell surface proteins and peptides	SNF-like	SNF-like	SNF-like	Na(+):neurotransmitter symporter homologue LeuT	(Aquifex aeolicus ) [TaxId: 63363 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	SNF-like	8033455	3001654	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	SNF-like	8033455	3001654	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth L]		e3tt1L1	A: EF-hand	X: EF-hand-related	H: EF-hand	T: cNMP_binding	F:	ECOD (20:10:01)
E [auth M]		e3tt1M1	A: Insertion subdomain in DsbA-like	X: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	H: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	T: PUF	F:	ECOD (20:10:01)
D [auth H]		e3tt1H1	A: EF-hand	X: EF-hand-related	H: EF-hand	T: cNMP_binding	F:	ECOD (20:10:01)
F [auth I]		e3tt1I1	A: Insertion subdomain in DsbA-like	X: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	H: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	T: PUF	F:	ECOD (20:10:01)
A		e3tt1A1	A: Insertion subdomain in DsbA-like	X: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	H: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	T: PUF	F:	ECOD (20:10:01)
B		e3tt1B1	A: Insertion subdomain in DsbA-like	X: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	H: Elongation factor TFIIS domain 2/ Kix domain of creb binding protein	T: PUF	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E [auth M]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
D [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F [auth I]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
C [auth L], E [auth M]	homologue of neurotransmitter sodium	L-KAPPA	Mus musculus (house mouse)	IGKV3-401, IGKJ201, IGKC01, IGKC02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-2A_KAPPA	IMGT (202609-0)
D [auth H], F [auth I]	homologue of neurotransmitter sodium	VH-CH1	Mus musculus (house mouse)	IGHV1-7601, IGHV1-8101, IGHJ401, IGHG2A01, IGHG2A*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-2A_KAPPA	IMGT (202609-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth L], E [auth M]	Light Chain	IGKV3	Kappa	leucine transporter leut	SAbDab (2026-03-13)
D [auth H], F [auth I]	Heavy Chain	IGHV1	-	leucine transporter leut	SAbDab (2026-03-13)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00209	Sodium:neurotransmitter symporter family (SNF)	Sodium:neurotransmitter symporter family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth L], E [auth M]	mouse monoclonal 1gG2a Fab fragment, heavy chain	-	-	-
D [auth H], F [auth I]	mouse monoclonal 1gG2a Fab fragment, kappa light chain	-	-	-
A, B	Leucine transporter LeuT	-	transport monoatomic ion transmembrane transport sodium ion transmembrane transport establishment of localization metal ion transport monoatomic cation transmembrane transport transmembrane transport localization monoatomic ion transport cellular process monoatomic cation transport sodium ion transport	cell periphery cellular anatomical structure plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR037272	Sodium:neurotransmitter symporter superfamily	Homologous Superfamily
A, B	IPR000175	Sodium:neurotransmitter symporter	Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Amino Acid Secondary Transporters	Crystal Structure of LeuT in the outward-open conformation in complex with Fab

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.