Annotations: 9HO5

Crystal Structure of the Human Frataxin protein in complex with a tailored Camelid Nanobody 4A7

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Frataxin/Nqo15-like	8035182	3001840	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)
B [auth C]	PAD_N	e9ho5C1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PAD_N	ECOD (v295.2)
A	Pkinase	e9ho5A1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Pkinase	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth C]	Heavy Chain	IGHV1	-	frataxin mature form	SAbDab (2026-08-21)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01491	Frataxin-like domain (Frataxin_Cyay)	Frataxin-like domain	This family contains proteins that have a domain related to the globular C-terminus of Frataxin the protein that is mutated in Friedreich's ataxia. This domain is found in a family of bacterial proteins. The function of this domain is currently unkno ...	This family contains proteins that have a domain related to the globular C-terminus of Frataxin the protein that is mutated in Friedreich's ataxia. This domain is found in a family of bacterial proteins. The function of this domain is currently unknown. It has been suggested that this family is involved in iron transport.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth C]	Camelid Nanobody 4A7	-	-	-
A	Frataxin mature form	cation binding transition metal ion binding iron ion binding ion binding binding ferrous iron binding metal ion binding small molecule binding ferric iron binding metallochaperone activity iron chaperone activity molecular carrier activity oxidoreductase activity, acting on metal ions oxidoreductase activity cation binding transition metal ion binding iron ion binding ion binding binding ferrous iron binding metal ion binding small molecule binding ferric iron binding metallochaperone activity iron chaperone activity molecular carrier activity oxidoreductase activity, acting on metal ions oxidoreductase activity ferroxidase activity oxidoreductase activity, acting on metal ions, oxygen as acceptor catalytic activity enzyme regulator activity enzyme activator activity molecular function activator activity molecular function regulator activity iron-sulfur cluster binding 2 iron, 2 sulfur cluster binding metal cluster binding	intracellular iron ion homeostasis inorganic ion homeostasis cellular homeostasis chemical homeostasis homeostatic process intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis primary metabolic process gene expression macromolecule biosynthetic process protein maturation intracellular iron ion homeostasis inorganic ion homeostasis cellular homeostasis chemical homeostasis homeostatic process intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis primary metabolic process gene expression macromolecule biosynthetic process protein maturation protein autoprocessing biosynthetic process proteolysis protein processing metabolic process cellular process protein metabolic process macromolecule metabolic process localization transport iron ion transport transition metal ion transport monoatomic ion transport monoatomic cation transport establishment of localization metal ion transport cellular component biogenesis cellular component organization metallo-sulfur cluster assembly cellular component assembly iron-sulfur cluster assembly cellular component organization or biogenesis cytochrome complex assembly protein-containing complex organization mitochondrial respiratory chain complex III assembly organelle organization respiratory chain complex III assembly mitochondrial respiratory chain complex assembly protein-containing complex assembly mitochondrion organization regulation of biological process regulation of cellular process negative regulation of programmed cell death regulation of apoptotic process biological regulation negative regulation of biological process regulation of programmed cell death cell death negative regulation of apoptotic process negative regulation of cellular process apoptotic process programmed cell death [4Fe-4S] cluster assembly response to stimulus response to metal ion response to iron ion response to chemical cellular response to stimulus cellular response to oxidative stress response to oxygen-containing compound cellular response to chemical stress cellular response to oxygen-containing compound cellular response to hydrogen peroxide response to reactive oxygen species response to hydrogen peroxide response to oxidative stress cellular response to reactive oxygen species cellular response to chemical stimulus cellular response to stress response to stress regulation of cellular component organization signaling negative regulation of signaling apoptotic mitochondrial changes regulation of signal transduction regulation of release of cytochrome c from mitochondria negative regulation of cell communication cell communication negative regulation of release of cytochrome c from mitochondria negative regulation of apoptotic signaling pathway signal transduction regulation of signaling negative regulation of cellular component organization negative regulation of response to stimulus negative regulation of signal transduction regulation of organelle organization apoptotic signaling pathway release of cytochrome c from mitochondria negative regulation of organelle organization regulation of response to stimulus regulation of mitochondrion organization regulation of cell communication regulation of apoptotic signaling pathway positive regulation of molecular function regulation of molecular function regulation of catalytic activity positive regulation of catalytic activity positive regulation of lyase activity heme metabolic process pigment metabolic process porphyrin-containing compound biosynthetic process tetrapyrrole metabolic process heme biosynthetic process pigment biosynthetic process tetrapyrrole biosynthetic process porphyrin-containing compound metabolic process [2Fe-2S] cluster assembly	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial protein-containing complex protein-containing complex catalytic complex sulfurtransferase complex transferase complex L-cysteine desulfurase complex membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial protein-containing complex protein-containing complex catalytic complex sulfurtransferase complex transferase complex L-cysteine desulfurase complex cytosol mitochondrial [2Fe-2S] assembly complex iron-sulfur cluster assembly complex membrane-enclosed lumen mitochondrial matrix intracellular organelle lumen organelle lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR020895	Frataxin conserved site	Conserved Site
A	IPR036524	Frataxin/CyaY superfamily	Homologous Superfamily
A	IPR002908	Frataxin/CyaY	Family
A	IPR017789	Frataxin	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: Q16595	Friedreich ataxia Friedreich ataxia 1 Ataxias, Hereditary brain disease hypertrophic cardiomyopathy lung cancer osteosarcoma atypical teratoid rhabdoid tumor Charcot-Marie-Tooth disease intellectual disability pancreatic ductal adenocarcinoma autosomal recessive cerebellar ataxia hereditary ataxia large cell medulloblastoma neurodegenerative disease Friedreich ataxia Friedreich ataxia 1 Ataxias, Hereditary brain disease hypertrophic cardiomyopathy lung cancer osteosarcoma atypical teratoid rhabdoid tumor Charcot-Marie-Tooth disease intellectual disability pancreatic ductal adenocarcinoma autosomal recessive cerebellar ataxia hereditary ataxia large cell medulloblastoma neurodegenerative disease tuberculosis

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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.