Annotations: 6E1K

Structure of AtTPC1(DDE) reconstituted in saposin A with cat06 Fab

External Resource: Annotation

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
Protein Modification Annotation

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
F	Anoctamin	e6e1kF1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
D	Flu_PB2_1st	e6e1kD1	A: beta barrels	X: Surp module (SWAP domain)	H: ADP-ribosylation	T: ADP-ribosylation	F: Flu_PB2_1st	ECOD (v294.2)
E	Anoctamin	e6e1kE1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
C	Anoctamin	e6e1kC1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
B	Anoctamin	e6e1kB1	A: beta barrels	X: Surp module (SWAP domain)	H: gp11/gp12 receptor-binding domain	T: gp11/gp12 receptor-binding domain	F: Anoctamin	ECOD (v294.2)
A	Flu_PB2_1st	e6e1kA1	A: beta barrels	X: Surp module (SWAP domain)	H: ADP-ribosylation	T: ADP-ribosylation	F: Flu_PB2_1st	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (utative)
A	1.10.287.70	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (utative)

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
D, F	Fab cat06	VH-CH1	Homo sapiens (human)	IGHV3-7401, IGHV3-7402, IGHJ401, IGHJ402, IGHJ403, IGHG101, IGHG102, IGHG104, IGHG1*05	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202617-0)
C, E	Fab cat06	L-KAPPA	Homo sapiens (human)	IGKV1D-1301, IGKJ101, IGKC*01	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202617-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, F	Heavy Chain	IGHV3	-	two pore calcium channel protein 1	SAbDab (2026-05-08)
C, E	Light Chain	IGKV1	Kappa	two pore calcium channel protein 1	SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00520	Ion transport protein (Ion_trans)	Ion transport protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D, F	cat06 heavy chain	-	-	-
C, E	cat06 light chain	-	-	-
A, B	Two pore calcium channel protein 1	cation binding ion binding binding calcium ion binding metal ion binding small molecule binding calcium channel activity monoatomic cation transmembrane transporter activity voltage-gated calcium channel activity gated channel activity monoatomic ion channel activity voltage-gated channel activity voltage-gated monoatomic ion channel activity voltage-gated monoatomic cation channel activity cation binding ion binding binding calcium ion binding metal ion binding small molecule binding calcium channel activity monoatomic cation transmembrane transporter activity voltage-gated calcium channel activity gated channel activity monoatomic ion channel activity voltage-gated channel activity voltage-gated monoatomic ion channel activity voltage-gated monoatomic cation channel activity monoatomic cation channel activity passive transmembrane transporter activity calcium ion transmembrane transporter activity channel activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity identical protein binding protein binding	regulation of stomatal movement regulation of biological process regulation of cellular process stomatal movement biological regulation cellular process regulation of jasmonic acid metabolic process oxoacid metabolic process ketone metabolic process regulation of lipid metabolic process jasmonic acid biosynthetic process long-chain fatty acid biosynthetic process lipid biosynthetic process jasmonic acid metabolic process regulation of stomatal movement regulation of biological process regulation of cellular process stomatal movement biological regulation cellular process regulation of jasmonic acid metabolic process oxoacid metabolic process ketone metabolic process regulation of lipid metabolic process jasmonic acid biosynthetic process long-chain fatty acid biosynthetic process lipid biosynthetic process jasmonic acid metabolic process organic acid metabolic process organic acid biosynthetic process carboxylic acid biosynthetic process regulation of primary metabolic process regulation of small molecule metabolic process small molecule metabolic process regulation of biosynthetic process fatty acid metabolic process long-chain fatty acid metabolic process monocarboxylic acid biosynthetic process small molecule biosynthetic process regulation of jasmonic acid biosynthetic process carboxylic acid metabolic process primary metabolic process fatty acid biosynthetic process regulation of ketone metabolic process biosynthetic process regulation of fatty acid metabolic process regulation of fatty acid biosynthetic process metabolic process monocarboxylic acid metabolic process regulation of lipid biosynthetic process regulation of metabolic process lipid metabolic process localization transport monoatomic ion transport monoatomic cation transport establishment of localization calcium ion transport metal ion transport developmental process multicellular organism development multicellular organismal process anatomical structure development post-embryonic development seed germination seedling development cellular response to stimulus response to stimulus signaling intracellular signal transduction cell communication calcium-mediated signaling intracellular signaling cassette signal transduction	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system cytosol cell periphery plasma membrane membrane vacuolar membrane membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system cytosol cell periphery plasma membrane membrane vacuolar membrane vacuole bounding membrane of organelle organelle membrane plant-type vacuole protein-containing complex transmembrane transporter complex membrane protein complex transporter complex monoatomic ion channel complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR005821	Ion transport domain	Domain
A, B	IPR044581	Two pore calcium channel protein 1, plant	Family
A, B	IPR002048	EF-hand domain	Domain
A, B	IPR011992	EF-hand domain pair	Homologous Superfamily
A, B	IPR027359	Voltage-dependent channel domain superfamily	Homologous Superfamily

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	Channels: Potassium, Sodium, & Proton Ion-Selective	Two-pore channel TPC1 without Ca²⁺-chelating amino acids reconstituted in saposin A

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A, B	SEP	Parent Component: SER : AA0037 : O-phospho-L-serine MOD:00046
A, B	TPO	Parent Component: THR : AA0037 , AA0038 : O-phospho-L-serine MOD:00046 , O-phospho-L-threonine MOD:00047

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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.