Annotations: 9QUW

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth D], C [auth F]	Heavy Chain	IGHV1	-	sodium/hydrogen exchanger 9b2	SAbDab (2025-12-19)
A [auth E], F [auth C]	Light Chain	IGKV10	Kappa	sodium/hydrogen exchanger 9b2	SAbDab (2025-12-19)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
D [auth A], E [auth B]	PF00999	Sodium/hydrogen exchanger, transmembrane (Na_H_Exchanger)	Sodium/hydrogen exchanger, transmembrane	Na/H antiporters are key transporters in maintaining the pH of actively metabolising cells. The molecular mechanisms of antiport are unclear. These antiporters contain 10-12 transmembrane regions (M) at the amino-terminus and a large cytoplasmic regi ...	Na/H antiporters are key transporters in maintaining the pH of actively metabolising cells. The molecular mechanisms of antiport are unclear. These antiporters contain 10-12 transmembrane regions (M) at the amino-terminus and a large cytoplasmic region at the carboxyl terminus. The transmembrane regions M3-M12 share identity with other members of the family. The M6 and M7 regions are highly conserved. Thus, this is thought to be the region that is involved in the transport of sodium and hydrogen ions. The cytoplasmic region has little similarity throughout the family. This entry represents the transmembrane region.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth A], E [auth B]	Sodium/hydrogen exchanger 9B2	monoatomic cation transmembrane transporter activity metal cation:monoatomic cation antiporter activity proton transmembrane transporter activity secondary active transmembrane transporter activity antiporter activity lithium:proton antiporter activity metal cation:proton antiporter activity active transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity sodium:proton antiporter activity sodium ion transmembrane transporter activity monoatomic cation transmembrane transporter activity metal cation:monoatomic cation antiporter activity proton transmembrane transporter activity secondary active transmembrane transporter activity antiporter activity lithium:proton antiporter activity metal cation:proton antiporter activity active transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity sodium:proton antiporter activity sodium ion transmembrane transporter activity identical protein binding protein binding binding	transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization cellular response to stimulus regulation of localization establishment of protein localization regulation of cellular process nitrogen compound transport response to stimulus cell communication transmembrane transport localization transport monoatomic ion transmembrane transport monoatomic ion transport cellular process establishment of localization cellular response to stimulus regulation of localization establishment of protein localization regulation of cellular process nitrogen compound transport response to stimulus cell communication carbohydrate homeostasis establishment of localization in cell intracellular protein localization regulation of biological quality regulation of peptide hormone secretion regulation of biological process regulation of hormone levels establishment of protein localization to extracellular region intracellular glucose homeostasis protein secretion cellular response to oxygen-containing compound regulation of protein secretion regulation of secretion cellular response to carbohydrate stimulus chemical homeostasis response to glucose response to chemical glucose homeostasis insulin secretion involved in cellular response to glucose stimulus cellular localization regulation of hormone secretion regulation of protein localization regulation of peptide secretion signaling homeostatic process hormone secretion protein localization to extracellular region peptide secretion regulation of secretion by cell secretion by cell response to monosaccharide response to carbohydrate amide transport signal release cellular response to hexose stimulus intracellular chemical homeostasis cellular response to monosaccharide stimulus regulation of signaling regulation of transport secretion regulation of peptide transport biological regulation regulation of establishment of protein localization export from cell cell-cell signaling response to oxygen-containing compound cellular response to glucose stimulus regulation of protein transport peptide transport response to hexose cellular response to chemical stimulus cellular homeostasis regulation of cellular localization protein transport regulation of insulin secretion peptide hormone secretion macromolecule localization regulation of insulin secretion involved in cellular response to glucose stimulus hormone transport regulation of cell communication insulin secretion import into cell clathrin-dependent endocytosis receptor-mediated endocytosis endocytosis vesicle-mediated transport sperm motility reproductive process cilium movement involved in cell motility cilium or flagellum-dependent cell motility cilium-dependent cell motility flagellated sperm motility microtubule-based movement microtubule-based process cilium movement cell motility lithium ion transport monoatomic cation transport metal ion transport sodium ion transport multicellular organismal process regulation of leukocyte differentiation regulation of cell differentiation regulation of cell development positive regulation of developmental process multicellular organism development skeletal system development cell differentiation anatomical structure development regulation of immune system process positive regulation of immune system process regulation of osteoclast development system development developmental process positive regulation of cell development regulation of myeloid leukocyte differentiation osteoclast development positive regulation of myeloid leukocyte differentiation positive regulation of multicellular organismal process leukocyte differentiation myeloid leukocyte differentiation cellular developmental process regulation of developmental process positive regulation of biological process cell development positive regulation of osteoclast differentiation regulation of osteoclast differentiation positive regulation of cell differentiation positive regulation of hemopoiesis bone cell development osteoclast differentiation regulation of multicellular organismal process bone development positive regulation of cellular process positive regulation of osteoclast development regulation of multicellular organismal development hemopoiesis regulation of myeloid cell differentiation animal organ development myeloid cell differentiation immune system process myeloid cell development positive regulation of myeloid cell differentiation regulation of hemopoiesis positive regulation of leukocyte differentiation sodium ion homeostasis inorganic ion homeostasis monoatomic ion homeostasis monoatomic cation homeostasis	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane cell periphery apical part of cell plasma membrane plasma membrane region apical plasma membrane basal part of cell basal plasma membrane basolateral plasma membrane cell projection sperm principal piece cilium 9+2 motile cilium sperm flagellum motile cilium plasma membrane bounded cell projection endosome membrane endosome intracellular vesicle recycling endosome endomembrane system cytoplasmic vesicle membrane bounding membrane of organelle recycling endosome membrane vesicle membrane cytoplasmic vesicle vesicle synapse transport vesicle membrane presynapse synaptic vesicle synaptic vesicle membrane cell junction transport vesicle exocytic vesicle membrane secretory vesicle exocytic vesicle
B [auth D], C [auth F]	Fab heavy chain	-	-	-
A [auth E], F [auth C]	Fab light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D [auth A], E [auth B]	IPR038770	Sodium/solute symporter superfamily	Homologous Superfamily
D [auth A], E [auth B]	IPR051843	Monovalent cation:proton antiporter 1	Family
D [auth A], E [auth B]	IPR006153	Cation/H+ exchanger, transmembrane domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
D [auth A], E [auth B]	Pharos: Q86UD5	asthma lung carcinoma malignant pancreatic neoplasm testicular cancer atrial fibrillation malignant ependymoma medulloblastoma testicular germ cell tumor glioblastoma malignant glioma osteosarcoma ulcerative colitis

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
D [auth A], E [auth B]	MemProtMD	Annotated as membrane protein by MemProtMD

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.