4RAV | pdb_00004rav

Crystal structure of scFvC4 in complex with the first 17 AA of huntingtin

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth C]	Defensin_1	e4ravC1	A: a/b three-layered sandwiches	X: jelly-roll	H: Acetamidase/Formamidase-like	T: Acetamidase/Formamidase-like	F: Defensin_1	ECOD (v294.1)
B [auth A]	Defensin_1	e4ravA1	A: a/b three-layered sandwiches	X: jelly-roll	H: Acetamidase/Formamidase-like	T: Acetamidase/Formamidase-like	F: Defensin_1	ECOD (v294.1)
C [auth D]	Defensin_1	e4ravD1	A: a/b three-layered sandwiches	X: jelly-roll	H: Acetamidase/Formamidase-like	T: Acetamidase/Formamidase-like	F: Defensin_1	ECOD (v294.1)
A [auth B]	Peptidase_S74	e4ravB1	A: a/b three-layered sandwiches	X: Repetitive alpha hairpins	H: C2 domain	T: C2 domain	F: Peptidase_S74	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
B [auth A]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth D]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
A [auth B]	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
B [auth A], D [auth C]	scFvC4	VH	Adeno-associated virus - 2	IGHV3-3001, IGHV3-3003, IGHV3-3004, IGHV3-3006, IGHV3-3007, IGHV3-3011, IGHV3-3012, IGHV3-3014, IGHV3-3016, IGHV3-3017, IGHV3-3019, IGHV3-30-301, IGHV3-3305, IGHV3-30-303, IGHJ2*01	V-DOMAIN VH	IG	SCFV-HEAVY-LAMBDA	IMGT (202612-0)
A [auth B], C [auth D]	scFvC4	V-LAMBDA	Adeno-associated virus - 2	IGLV2-1401, IGLJ201	V-DOMAIN V-LAMBDA	IG	SCFV-HEAVY-LAMBDA	IMGT (202612-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth A], D [auth C]	Heavy Chain	IGHV3	-	huntingtin	SAbDab (2026-03-27)
A [auth B], C [auth D]	Light Chain	IGLV2	Lambda	huntingtin	SAbDab (2026-03-27)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E, F	Huntingtin	phosphoric ester hydrolase activity phosphoprotein phosphatase activity catalytic activity, acting on a protein hydrolase activity, acting on ester bonds phosphatase activity hydrolase activity catalytic activity protein binding binding heat shock protein binding cytoskeletal protein binding dynactin binding dynein intermediate chain binding identical protein binding phosphoric ester hydrolase activity phosphoprotein phosphatase activity catalytic activity, acting on a protein hydrolase activity, acting on ester bonds phosphatase activity hydrolase activity catalytic activity protein binding binding heat shock protein binding cytoskeletal protein binding dynactin binding dynein intermediate chain binding identical protein binding p53 binding profilin binding kinase binding enzyme binding transmembrane transporter binding beta-tubulin binding tubulin binding	multicellular organismal process system process learning or memory learning nervous system process imitative learning auditory behavior response to stimulus vocal learning learned vocalization behavior or vocal learning response to mechanical stimulus cognition response to external stimulus mechanosensory behavior behavior multicellular organismal process system process learning or memory learning nervous system process imitative learning auditory behavior response to stimulus vocal learning learned vocalization behavior or vocal learning response to mechanical stimulus cognition response to external stimulus mechanosensory behavior behavior response to auditory stimulus observational learning response to abiotic stimulus developmental process multicellular organism development central nervous system development anatomical structure development nervous system development system development protein destabilization regulation of protein stability biological regulation regulation of biological quality cellular response to stimulus regulation of biological process regulation of signaling regulation of cellular process signaling regulation of signal transduction intracellular signal transduction cell communication regulation of CAMKK-AMPK signaling cascade calcium-mediated signaling regulation of intracellular signal transduction regulation of response to stimulus intracellular signaling cassette regulation of calcium-mediated signaling regulation of cell communication cellular process signal transduction CAMKK-AMPK signaling cascade apoptotic process cell death programmed cell death positive regulation of programmed cell death regulation of apoptotic process positive regulation of biological process regulation of programmed cell death positive regulation of apoptotic process positive regulation of cellular process vesicle localization establishment of organelle localization cellular localization transport establishment of vesicle localization establishment of localization localization organelle localization establishment of localization in cell synaptic vesicle localization synaptic vesicle transport retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum Golgi vesicle transport vesicle-mediated transport microtubule cytoskeleton organization spindle localization establishment or maintenance of cell polarity mitotic cell cycle cellular component organization establishment of mitotic spindle localization establishment of spindle localization establishment of spindle orientation cell cycle cellular component organization or biogenesis microtubule cytoskeleton organization involved in mitosis cell cycle process establishment of cell polarity organelle organization mitotic cell cycle process establishment of mitotic spindle orientation microtubule-based process cytoskeleton organization negative regulation of signaling negative regulation of biological process extrinsic apoptotic signaling pathway negative regulation of cell communication negative regulation of extrinsic apoptotic signaling pathway negative regulation of apoptotic signaling pathway negative regulation of cellular process cell surface receptor signaling pathway negative regulation of response to stimulus negative regulation of programmed cell death negative regulation of signal transduction regulation of extrinsic apoptotic signaling pathway apoptotic signaling pathway negative regulation of apoptotic process regulation of apoptotic signaling pathway positive regulation of cell communication positive regulation of CAMKK-AMPK signaling cascade positive regulation of signal transduction positive regulation of response to stimulus positive regulation of calcium-mediated signaling positive regulation of intracellular signal transduction positive regulation of signaling neurogenesis cellular developmental process cell differentiation vesicle cytoskeletal trafficking organelle transport along microtubule intracellular transport vesicle transport along microtubule microtubule-based transport transport along microtubule cytoskeleton-dependent intracellular transport microtubule-based movement positive regulation of autophagy catabolic process lipophagy macroautophagy autophagy regulation of catabolic process regulation of autophagy positive regulation of catabolic process positive regulation of metabolic process regulation of macroautophagy metabolic process positive regulation of lipophagy regulation of lipophagy positive regulation of macroautophagy process utilizing autophagic mechanism regulation of metabolic process regulation of aggrephagy positive regulation of aggrephagy aggrephagy positive regulation of organelle organization regulation of cellular component organization positive regulation of cellular component organization cell projection organization plasma membrane bounded cell projection assembly cellular component biogenesis cellular component assembly cilium assembly positive regulation of cell projection organization cilium organization plasma membrane bounded cell projection organization organelle assembly positive regulation of cellular component biogenesis regulation of cell projection organization regulation of cell projection assembly regulation of cellular component biogenesis regulation of organelle organization regulation of plasma membrane bounded cell projection assembly positive regulation of cilium assembly regulation of cilium assembly regulation of organelle assembly cell projection assembly regulation of plasma membrane bounded cell projection organization positive regulation of plasma membrane bounded cell projection assembly positive regulation of organelle assembly positive regulation of autophagy of mitochondrion mitophagy regulation of autophagy of mitochondrion positive regulation of mitophagy regulation of mitophagy autophagy of mitochondrion Golgi organization endomembrane system organization	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection inclusion body membrane-bounded organelle intracellular organelle organelle cellular anatomical structure intracellular anatomical structure cytoplasm cytosol somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection inclusion body membrane-bounded organelle intracellular organelle organelle vacuole autophagosome intracellular membrane-bounded organelle Golgi apparatus endomembrane system perinuclear region of cytoplasm axon microtubule organizing center cytoskeleton membraneless organelle centriole intracellular membraneless organelle microtubule cytoskeleton presynapse presynaptic cytosol synapse cell junction nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen protein-containing complex membrane intracellular vesicle cytoplasmic vesicle membrane vesicle membrane cytoplasmic vesicle vesicle organelle membrane early endosome endosome late endosome endoplasmic reticulum postsynapse postsynaptic cytosol
B [auth A], D [auth C]	single-chain Fv, VH	-	-	-
A [auth B], C [auth D]	Single-chain Fv, VL	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E, F	IPR016024	Armadillo-type fold	Homologous Superfamily
E, F	IPR048412	Huntingtin, bridge	Repeat
E, F	IPR048411	Huntingtin, N-terminal, HEAT repeats 1	Repeat
E, F	IPR000091	Huntingtin	Family
E, F	IPR011989	Armadillo-like helical	Homologous Superfamily
E, F	IPR028426	Huntingtin family	Family
E, F	IPR024613	Huntingtin, N-terminal, HEAT repeats 2	Repeat
E, F	IPR048413	Huntingtin, C-terminal HEAT repeats	Repeat

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
E, F	Pharos: P42858	Huntington disease manganese poisoning cadmium poisoning Lopes-Maciel-Rodan syndrome neurodegenerative disease toxic encephalopathy Akinetic-Rigid Variant of Huntington Disease dementia intellectual disability movement disorder Parkinson disease brain disease depressive disorder juvenile Huntington disease psoriasis Huntington disease manganese poisoning cadmium poisoning Lopes-Maciel-Rodan syndrome neurodegenerative disease toxic encephalopathy Akinetic-Rigid Variant of Huntington Disease dementia intellectual disability movement disorder Parkinson disease brain disease depressive disorder juvenile Huntington disease psoriasis endogenous depression

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.