Annotations: 9PUO

Neutralizing monoclonal antibody Fab fragment bound to leptin

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)
C	SCOP2B Superfamily	4-helical cytokines	8037082	3001717	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)
F	V-set	e9puoF1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: V-set	ECOD (v295.2)
C	SPRY	e9puoC1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: SPRY	ECOD (v295.2)
E	Fer2	e9puoE1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Fer2	ECOD (v295.2)
B	Fer2	e9puoB1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: Fer2	ECOD (v295.2)
D	PCI	e9puoD1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PCI	ECOD (v295.2)
A	PCI	e9puoA1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: PCI	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B, E	Light Chain	IGLV1	Lambda	leptin	SAbDab (2026-09-11)
A, D	Heavy Chain	IGHV1	-	leptin	SAbDab (2026-09-11)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C, F	PF02024	Leptin (Leptin)	Leptin		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C, F	Leptin	peptide hormone receptor binding protein binding binding signaling receptor binding hormone receptor binding DNA binding nucleic acid binding hormone activity molecular function activator activity molecular function regulator activity signaling receptor regulator activity receptor ligand activity signaling receptor activator activity leptin receptor binding	leukocyte tethering or rolling leukocyte cell-cell adhesion leukocyte migration cell adhesion cell-cell adhesion immune system process leukocyte adhesion to vascular endothelial cell cellular extravasation cell migration cellular process cell motility multicellular organismal process regulation of developmental process angiogenesis leukocyte tethering or rolling leukocyte cell-cell adhesion leukocyte migration cell adhesion cell-cell adhesion immune system process leukocyte adhesion to vascular endothelial cell cellular extravasation cell migration cellular process cell motility multicellular organismal process regulation of developmental process angiogenesis regulation of vasculature development multicellular organism development tube morphogenesis anatomical structure development regulation of multicellular organismal process regulation of anatomical structure morphogenesis blood vessel development system development developmental process regulation of multicellular organismal development regulation of biological process blood vessel morphogenesis tube development biological regulation vasculature development circulatory system development anatomical structure morphogenesis regulation of angiogenesis anatomical structure formation involved in morphogenesis animal gross anatomical part developmental process fat cell differentiation regulation of cellular process cellular developmental process regulation of cell differentiation regulation of brown fat cell differentiation brown fat cell differentiation cell differentiation regulation of fat cell differentiation system process circulatory system process regulation of blood pressure regulation of biological quality blood circulation regulation of tube diameter regulation of tube size regulation of system process negative regulation of biological process negative regulation of vasoconstriction regulation of blood circulation vascular process in circulatory system regulation of vasoconstriction blood vessel diameter maintenance negative regulation of multicellular organismal process vasoconstriction regulation of anatomical structure size placenta development animal organ development import into cell localization transport phagocytosis endocytosis establishment of localization cellular response to stimulus cell surface receptor signaling pathway via STAT cell surface receptor signaling pathway response to stimulus signaling cell communication signal transduction carbohydrate metabolic process polyol metabolic process small molecule biosynthetic process glycerol biosynthetic process carbohydrate biosynthetic process alditol biosynthetic process primary metabolic process alcohol metabolic process glycerol metabolic process biosynthetic process polyol biosynthetic process alcohol biosynthetic process metabolic process small molecule metabolic process positive regulation of cell communication positive regulation of signal transduction positive regulation of biological process regulation of signal transduction intracellular signal transduction positive regulation of response to stimulus regulation of intracellular signal transduction positive regulation of TOR signaling positive regulation of cellular process TOR signaling regulation of signaling regulation of TOR signaling positive regulation of intracellular signal transduction regulation of response to stimulus regulation of cell communication positive regulation of signaling prostaglandin transport secretion by cell monocarboxylic acid transport fatty acid transport icosanoid transport signal release prostaglandin secretion icosanoid secretion carboxylic acid transport secretion cell-cell signaling export from cell lipid localization lipid transport organic acid transport lipid export from cell macromolecule localization regulation of growth regulation of developmental growth developmental growth growth positive regulation of developmental process positive regulation of growth positive regulation of developmental growth digestion intestinal absorption digestive system process response to nutrient levels regulation of response to nutrient levels response to cytokine negative regulation of appetite by leptin-mediated signaling pathway cytokine-mediated signaling pathway cellular response to leptin stimulus cellular response to endogenous stimulus response to hormone response to food cellular response to cytokine stimulus response to leptin regulation of appetite cellular response to hormone stimulus leptin-mediated signaling pathway negative regulation of response to food negative regulation of response to nutrient levels negative regulation of response to stimulus response to endogenous stimulus response to peptide cellular response to chemical stimulus negative regulation of appetite regulation of response to food response to chemical response to lipid response to oxygen-containing compound cellular response to oxygen-containing compound response to retinoic acid cellular response to retinoic acid cellular response to lipid response to nutrient response to L-ascorbic acid response to vitamin cellular response to nutrient levels cellular response to carbohydrate stimulus response to monosaccharide response to carbohydrate cellular response to vitamin cellular response to monosaccharide stimulus cellular response to nutrient cellular response to L-ascorbic acid regulation of localization lipid storage negative regulation of lipid localization regulation of lipid storage regulation of lipid localization negative regulation of lipid storage negative regulation of cellular process nutrient storage hemopoiesis cell activation cell development mononuclear cell differentiation lymphocyte activation lymphocyte differentiation leukocyte activation T cell activation T cell differentiation leukocyte differentiation establishment of protein localization cellular localization regulation of protein localization nucleocytoplasmic transport positive regulation of nucleocytoplasmic transport nuclear transport positive regulation of establishment of protein localization regulation of protein localization to nucleus positive regulation of protein transport import into nucleus regulation of protein import into nucleus establishment of localization in cell protein import into nucleus positive regulation of intracellular transport intracellular protein localization regulation of intracellular transport regulation of transport positive regulation of protein localization to nucleus regulation of establishment of protein localization positive regulation of protein import into nucleus intracellular transport regulation of nucleocytoplasmic transport protein localization to nucleus regulation of protein transport establishment of protein localization to organelle positive regulation of transport protein transport regulation of cellular localization protein localization to organelle positive regulation of protein localization regulation of intracellular protein transport positive regulation of intracellular protein transport intracellular protein transport bone maturation bone mineralization bone mineralization involved in bone maturation developmental maturation tissue development skeletal system development ossification anatomical structure maturation biomineral tissue development ossification involved in bone maturation animal organ maturation bone development intracellular receptor signaling pathway positive regulation of peroxisome proliferator activated receptor signaling pathway peroxisome proliferator activated receptor signaling pathway regulation of peroxisome proliferator activated receptor signaling pathway nuclear receptor-mediated signaling pathway regulation of cell activation positive regulation of hepatic stellate cell activation fibroblast activation regulation of hepatic stellate cell activation positive regulation of cell activation hepatic stellate cell activation positive regulation of multicellular organismal process positive regulation of interleukin-8 production positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of biosynthetic process cytokine production regulation of cytokine production positive regulation of macromolecule metabolic process regulation of biosynthetic process interleukin-8 production regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression positive regulation of gene expression regulation of macromolecule biosynthetic process macromolecule metabolic process positive regulation of cytokine production regulation of metabolic process regulation of interleukin-8 production cellular response to nitrogen compound response to peptide hormone insulin receptor signaling pathway regulation of cellular response to insulin stimulus cell surface receptor protein tyrosine kinase signaling pathway enzyme-linked receptor protein signaling pathway positive regulation of cellular response to insulin stimulus regulation of insulin receptor signaling pathway positive regulation of insulin receptor signaling pathway cellular response to peptide hormone stimulus response to nitrogen compound response to insulin cellular response to insulin stimulus cell surface receptor signaling pathway via JAK-STAT regulation of protein modification process positive regulation of phosphorylation regulation of catalytic activity regulation of protein phosphorylation positive regulation of protein metabolic process regulation of transferase activity positive regulation of phosphate metabolic process regulation of primary metabolic process positive regulation of molecular function positive regulation of protein modification process phosphate-containing compound metabolic process protein metabolic process positive regulation of protein kinase activity protein modification process positive regulation of protein phosphorylation protein phosphorylation phosphorylation regulation of protein metabolic process positive regulation of catalytic activity regulation of protein kinase activity regulation of molecular function positive regulation of kinase activity activation of protein kinase C activity regulation of kinase activity activation of protein kinase activity macromolecule modification regulation of phosphorylation ovulation cycle process ovulation sexual reproduction reproductive process sex differentiation development of primary female sexual characteristics female gamete generation developmental process involved in reproduction gamete generation ovulation from ovarian follicle ovulation cycle development of primary sexual characteristics reproductive structure development rhythmic process gonad development reproductive system development female gonad development multicellular organismal reproductive process female sex differentiation response to decreased oxygen levels response to hypoxia response to stress response to oxygen levels response to abiotic stimulus negative regulation of catabolic process catabolic process negative regulation of metabolic process autophagy regulation of catabolic process regulation of autophagy negative regulation of autophagy process utilizing autophagic mechanism response to vitamin E RNA metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process transcription by RNA polymerase II negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of transcription by RNA polymerase II negative regulation of DNA-templated transcription negative regulation of transcription by RNA polymerase II nucleobase-containing compound biosynthetic process nucleic acid metabolic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of DNA-templated transcription negative regulation of RNA metabolic process positive regulation of cell population proliferation regulation of leukocyte activation lymphocyte proliferation positive regulation of leukocyte activation regulation of immune system process positive regulation of immune system process regulation of leukocyte proliferation cell population proliferation positive regulation of T cell activation positive regulation of lymphocyte proliferation positive regulation of T cell proliferation regulation of cell population proliferation mononuclear cell proliferation regulation of leukocyte cell-cell adhesion positive regulation of leukocyte proliferation positive regulation of leukocyte cell-cell adhesion leukocyte proliferation positive regulation of cell-cell adhesion positive regulation of lymphocyte activation positive regulation of mononuclear cell proliferation regulation of cell-cell adhesion T cell proliferation regulation of lymphocyte proliferation positive regulation of cell adhesion regulation of cell adhesion regulation of T cell activation regulation of T cell proliferation regulation of mononuclear cell proliferation regulation of lymphocyte activation tissue remodeling regulation of bone remodeling bone remodeling regulation of tissue remodeling behavior adult feeding behavior adult behavior feeding behavior regulation of endothelial cell proliferation endothelial cell proliferation regulation of epithelial cell proliferation epithelial cell proliferation hexose transmembrane transport regulation of D-glucose import across plasma membrane carbohydrate import across plasma membrane carbohydrate transport negative regulation of transport negative regulation of D-glucose import across plasma membrane negative regulation of transmembrane transport hexose import across plasma membrane import across plasma membrane negative regulation of D-glucose transmembrane transport transmembrane transport regulation of transmembrane transport D-glucose import across plasma membrane D-glucose transmembrane transport regulation of D-glucose transmembrane transport monosaccharide transmembrane transport carbohydrate transmembrane transport regulation of monoatomic ion transport positive regulation of monoatomic ion transport monoatomic ion transport positive regulation of programmed cell death regulation of apoptotic process regulation of programmed cell death cell death positive regulation of apoptotic process regulation of fat cell apoptotic process positive regulation of fat cell apoptotic process fat cell apoptotic process apoptotic process programmed cell death circadian rhythm multi-multicellular organism process female pregnancy multi-organism reproductive process negative regulation of programmed cell death negative regulation of apoptotic process interleukin-6 production positive regulation of interleukin-6 production regulation of interleukin-6 production regulation of natural killer cell activation natural killer cell activation natural killer cell proliferation regulation of natural killer cell proliferation fatty acid metabolic process lipid catabolic process oxoacid metabolic process carboxylic acid metabolic process fatty acid catabolic process monocarboxylic acid catabolic process carboxylic acid catabolic process monocarboxylic acid metabolic process small molecule catabolic process lipid metabolic process response to activity organ growth bone growth multicellular organismal-level homeostasis homeostatic process energy homeostasis regulation of interleukin-12 production interleukin-12 production positive regulation of interleukin-12 production regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction intracellular signaling cassette positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction phosphatidylinositol 3-kinase/protein kinase B signal transduction energy derivation by oxidation of organic compounds energy reserve metabolic process generation of precursor metabolites and energy regulation of hormone secretion gonadotropin secretion positive regulation of secretion by cell hormone secretion positive regulation of hormone secretion regulation of secretion by cell regulation of luteinizing hormone secretion positive regulation of secretion luteinizing hormone secretion positive regulation of gonadotropin secretion regulation of hormone levels regulation of gonadotropin secretion positive regulation of luteinizing hormone secretion regulation of secretion endocrine process hormone transport regulation of endocrine process negative regulation of amino acid transport nitrogen compound transport negative regulation of amine transport L-amino acid transport regulation of amino acid transport regulation of glutamine transport neutral amino acid transport amino acid transport amine transport negative regulation of glutamine transport L-glutamine transport negative regulation of organic acid transport regulation of organic acid transport regulation of amine transport reactive oxygen species metabolic process positive regulation of reactive oxygen species metabolic process regulation of reactive oxygen species metabolic process response to alcohol response to ethanol lipoprotein modification regulation of lipoprotein oxidation lipoprotein metabolic process regulation of lipid metabolic process lipoprotein oxidation regulation of lipoprotein metabolic process lipid oxidation lipoprotein lipid oxidation lipid modification regulation of lipoprotein lipid oxidation regulation of immune effector process lymphocyte mediated immunity regulation of defense response regulation of natural killer cell mediated cytotoxicity regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms regulation of response to external stimulus response to biotic stimulus regulation of response to stress innate immune response leukocyte mediated immunity response to external biotic stimulus natural killer cell mediated immunity regulation of natural killer cell mediated immunity immune response response to other organism defense response regulation of innate immune response regulation of leukocyte mediated cytotoxicity defense response to symbiont response to external stimulus leukocyte mediated cytotoxicity immune effector process regulation of leukocyte mediated immunity regulation of lymphocyte mediated immunity defense response to other organism natural killer cell mediated cytotoxicity regulation of immune response regulation of cell killing cell killing adaptive thermogenesis regulation of cold-induced thermogenesis cold-induced thermogenesis temperature homeostasis positive regulation of cold-induced thermogenesis positive regulation of MAPK cascade regulation of MAPK cascade MAPK cascade positive regulation of follicle-stimulating hormone secretion regulation of follicle-stimulating hormone secretion follicle-stimulating hormone secretion muscle hypertrophy cardiac muscle hypertrophy striated muscle hypertrophy muscle system process positive regulation of receptor signaling pathway via STAT positive regulation of receptor signaling pathway via JAK-STAT regulation of receptor signaling pathway via JAK-STAT regulation of receptor signaling pathway via STAT regulation of cytokine production involved in inflammatory response production of molecular mediator involved in inflammatory response cytokine production involved in inflammatory response inflammatory response p38MAPK cascade positive regulation of p38MAPK cascade regulation of p38MAPK cascade regulation of cartilage development connective tissue development negative regulation of cartilage development negative regulation of developmental process cartilage development cell cycle regulation of cell cycle regulation of tumor necrosis factor production positive regulation of tumor necrosis factor superfamily cytokine production tumor necrosis factor superfamily cytokine production positive regulation of tumor necrosis factor production tumor necrosis factor production regulation of tumor necrosis factor superfamily cytokine production regulation of nitric-oxide synthase activity regulation of oxidoreductase activity response to estradiol regulation of peptide secretion negative regulation of signaling glucagon secretion negative regulation of cell communication negative regulation of peptide secretion peptide secretion negative regulation of secretion regulation of glucagon secretion negative regulation of hormone secretion negative regulation of secretion by cell regulation of peptide hormone secretion negative regulation of glucagon secretion negative regulation of peptide hormone secretion regulation of peptide transport peptide transport peptide hormone secretion response to dietary excess	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol protein-containing complex signaling receptor complex extracellular region
B, E	Neutralizing antibody Fab fragment, light chain	-	-	-
A, D	Neutralizing antibody Fab fragment, heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, F	IPR000065	Leptin	Family
C, F	IPR009079	Four-helical cytokine-like, core	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C, F	: P41159	obesity due to congenital leptin deficiency obesity disorder polycystic ovary syndrome metabolic syndrome X gestational diabetes Alzheimer disease non-alcoholic fatty liver disease Crohn disease hyperinsulinism hypertensive disorder autoimmune hepatitis breast carcinoma type 2 diabetes mellitus malignant colon neoplasm gastric ulcer obesity due to congenital leptin deficiency obesity disorder polycystic ovary syndrome metabolic syndrome X gestational diabetes Alzheimer disease non-alcoholic fatty liver disease Crohn disease hyperinsulinism hypertensive disorder autoimmune hepatitis breast carcinoma type 2 diabetes mellitus malignant colon neoplasm gastric ulcer Nerve Degeneration heroin dependence hyperplasia female infertility morbid obesity glucose intolerance visual epilepsy proteinuria hypogonadism prostate cancer benign colon neoplasm schizophrenia fatty liver disease breast fibroadenoma colonic neoplasm sleep-wake disorder hyperglycemia alcohol withdrawal diabetes mellitus inborn carbohydrate metabolic disorder Emery-Dreifuss muscular dystrophy atopic eczema autoimmune disease breast cancer maturity-onset diabetes of the young cancer acquired metabolic disease ovarian cancer hypogonadotropic hypogonadism ductal breast carcinoma in situ atherosclerosis autism kidney disease major depressive disorder coronary artery disease Crohn's colitis depressive disorder ileocolitis prediabetes syndrome eating disorder inherited lipid metabolism disorder invasive ductal breast carcinoma psoriasis facioscapulohumeral muscular dystrophy lipodystrophy

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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.