Annotations: 7ZK1

Crystal structure of cystinosin from Arabidopsis thaliana bound to sybody and nanobody

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
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	Glycos_transf_N	e7zk1C1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Glycos_transf_N	ECOD (v295.2)
B	Glycos_transf_N	e7zk1B1	A: alpha arrays	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel	F: Glycos_transf_N	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B	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	Heavy Chain	IGHV1	-	cystinosin homolog	SAbDab (2026-09-11)
B	Heavy Chain	IGHV1	-	cystinosin homolog	SAbDab (2026-09-11)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF04193	PQ loop repeat (PQ-loop)	PQ loop repeat	-	Repeat

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	Synthetic nanobody (Sybody)	-	-	-
B	Llama derived nanobody	-	-	-
A	Cystinosin homolog	L-amino acid transmembrane transporter activity amino acid transmembrane transporter activity L-cystine transmembrane transporter activity sulfur amino acid transmembrane transporter activity sulfur compound transmembrane transporter activity transporter activity carboxylic acid transmembrane transporter activity transmembrane transporter activity modified amino acid transmembrane transporter activity	nitrogen compound transport carboxylic acid transport transport L-cystine transport neutral amino acid transport L-amino acid transport establishment of localization organic acid transport amino acid transport localization sulfur amino acid transport sulfur compound transport modified amino acid transport	vacuolar membrane membrane-bounded organelle intracellular anatomical structure membrane vacuole intracellular membrane-bounded organelle intracellular organelle bounding membrane of organelle cellular anatomical structure organelle cytoplasm organelle membrane lytic vacuole lytic vacuole membrane vacuolar membrane membrane-bounded organelle intracellular anatomical structure membrane vacuole intracellular membrane-bounded organelle intracellular organelle bounding membrane of organelle cellular anatomical structure organelle cytoplasm organelle membrane lytic vacuole lytic vacuole membrane lysosomal membrane lysosome plastid chloroplast plant-type vacuole

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR005282	Lysosomal cystine transporter	Family
A	IPR006603	PQ-loop repeat	Repeat

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	PQ-loop transporters	Lysosomal cystine transporter

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	SWEET and semiSWEET Transporters, and Their Relatives	Cystinosin cystine transporter bound to sybody and nanobody

RCSB PDB is hosted by

RCSB PDB is a member of

RCSB Partners
Nucleic Acid Knowledgebase

CoreTrustSeal

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.