8DN6 | pdb_00008dn6

The crystal structure of the Arabidopsis thaliana Toc75 POTRA domains in complex with fab tc2

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	F_UNCLASSIFIED	e8dn6B1	A: a+b duplicates or obligate multimers	X: Polypeptide transport-associated (POTRA) domain (From Topology)	H: Polypeptide transport-associated (POTRA) domain (From Topology)	T: Polypeptide transport-associated (POTRA) domain	F: F_UNCLASSIFIED	ECOD (1.6)
A	F_UNCLASSIFIED	e8dn6A1	A: a+b duplicates or obligate multimers	X: Polypeptide transport-associated (POTRA) domain (From Topology)	H: Polypeptide transport-associated (POTRA) domain (From Topology)	T: Polypeptide transport-associated (POTRA) domain	F: F_UNCLASSIFIED	ECOD (1.6)
E	F_UNCLASSIFIED	e8dn6E1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: F_UNCLASSIFIED	ECOD (1.6)
C	F_UNCLASSIFIED	e8dn6C2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: F_UNCLASSIFIED	ECOD (1.6)
F	F_UNCLASSIFIED	e8dn6F2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: F_UNCLASSIFIED	ECOD (1.6)
D	F_UNCLASSIFIED	e8dn6D2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: F_UNCLASSIFIED	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
F	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C, E	Heavy Chain	IGHV3	-	protein toc75-3, chloroplastic	SAbDab (2026-02-06)
D, F	Light Chain	IGKV1	Kappa	protein toc75-3, chloroplastic	SAbDab (2026-02-06)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF25282	Toc75-like, POTRA domain (POTRA1_3_Toc75)	Toc75-like, POTRA domain	This entry represents the first and third POTRA domains of Toc75 from Arabidopsis thaliana and similar plant proteins. Toc75 is an essential protein required for the import of protein precursors into chloroplasts. Toc75 has three POTRA domains, repre ...	This entry represents the first and third POTRA domains of Toc75 from Arabidopsis thaliana and similar plant proteins. Toc75 is an essential protein required for the import of protein precursors into chloroplasts. Toc75 has three POTRA domains, represented by this entry and Pfam:PF25280, which together adopt a bent L-shaped conformation. The first and third POTRA domains fold into one another, each containing the conserved core beta-alpha-alpha-beta-beta fold seen in other POTRA domains [1].	Domain
A, B	PF25280	Toc75-like, second POTRA domain (POTRA2_Toc75)	Toc75-like, second POTRA domain	This is the second POTRA domain of Toc75 from Arabidopsis thaliana and similar plant proteins. Toc75 is an essential protein required for the import of protein precursors into chloroplasts. Toc75 has three POTRA domains, which together bent L-shaped ...	This is the second POTRA domain of Toc75 from Arabidopsis thaliana and similar plant proteins. Toc75 is an essential protein required for the import of protein precursors into chloroplasts. Toc75 has three POTRA domains, which together bent L-shaped conformation. The second POTRA domain contains a 40-residue insertion that folds into an elongated extra alpha-helix and loop, producing an overall beta-alpha-alpha -alpha-beta-beta fold [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Protein TOC75-3, chloroplastic	macromolecule transmembrane transporter activity active transmembrane transporter activity protein transporter activity primary active transmembrane transporter activity ATPase-coupled transmembrane transporter activity protein transmembrane transporter activity protein-transporting ATPase activity transporter activity transmembrane transporter activity ATP-dependent activity	cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization cellular process intracellular protein localization intracellular protein transport transmembrane transport establishment of protein localization to chloroplast cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization cellular process intracellular protein localization intracellular protein transport transmembrane transport establishment of protein localization to chloroplast protein localization to chloroplast establishment of protein localization to organelle protein transmembrane transport protein localization to organelle protein import into chloroplast stroma protein targeting protein targeting to chloroplast developmental process multicellular organism development multicellular organismal process anatomical structure morphogenesis embryonic morphogenesis anatomical structure development embryo development cellular component organization organelle organization plastid organization chloroplast organization cellular component organization or biogenesis	membrane-bounded organelle plastid membrane intracellular anatomical structure plastid membrane chloroplast envelope organelle outer membrane intracellular membrane-bounded organelle plastid outer membrane chloroplast outer membrane intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle membrane-bounded organelle plastid membrane intracellular anatomical structure plastid membrane chloroplast envelope organelle outer membrane intracellular membrane-bounded organelle plastid outer membrane chloroplast outer membrane intracellular organelle organelle envelope cellular anatomical structure bounding membrane of organelle chloroplast membrane organelle outer membrane cytoplasm organelle membrane plastid envelope chloroplast TOC-TIC supercomplex I protein-containing complex cytosol Toc complex membrane protein complex plant-type vacuole vacuole
C, E	fabtc2_HC	-	-	-
D, F	fabtc2_LC	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR039910	Surface antigen D15-like	Family
A, B	IPR057355	Toc75-like, second POTRA domain	Domain
A, B	IPR005689	Chloroplast envelope protein translocase, IAP75	Family
A, B	IPR000184	Bacterial surface antigen (D15)	Domain
A, B	IPR057354	Toc75-like, POTRA domain	Domain

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.