Annotations: 8SGI

Cryo-EM structure of human NCX1 in complex with SEA0400

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth L]	ATP-synt_ab	e8sgiL01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: ATP-synt_ab	ECOD (v295)
C [auth H]	ATP-synt_ab	e8sgiH01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: ATP-synt_ab	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L]	Light Chain	IGLV1	Lambda	sodium/calcium exchanger 1	SAbDab (2026-06-26)
C [auth H]	Heavy Chain	IGHV1	-	sodium/calcium exchanger 1	SAbDab (2026-06-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF03160	Calx-beta domain (Calx-beta)	Calx-beta domain		Domain
A	PF16494	C-terminal extension of sodium/calcium exchanger domain (Na_Ca_ex_C)	C-terminal extension of sodium/calcium exchanger domain	-	Family
A	PF01699	Sodium/calcium exchanger protein (Na_Ca_ex)	Sodium/calcium exchanger protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Sodium/calcium exchanger 1	monoatomic cation transmembrane transporter activity metal cation:monoatomic cation antiporter activity calcium:monoatomic cation antiporter activity sodium ion transmembrane transporter activity secondary active transmembrane transporter activity antiporter activity active transmembrane transporter activity calcium ion transmembrane transporter activity calcium:sodium antiporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity cytoskeletal protein binding monoatomic cation transmembrane transporter activity metal cation:monoatomic cation antiporter activity calcium:monoatomic cation antiporter activity sodium ion transmembrane transporter activity secondary active transmembrane transporter activity antiporter activity active transmembrane transporter activity calcium ion transmembrane transporter activity calcium:sodium antiporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity cytoskeletal protein binding ankyrin binding protein binding binding calmodulin binding cation binding ion binding calcium ion binding metal ion binding small molecule binding transmembrane transporter binding	membrane depolarization during action potential membrane depolarization biological regulation membrane depolarization during cardiac muscle cell action potential action potential regulation of biological quality cardiac muscle cell action potential regulation of membrane potential heart process multicellular organismal process system process regulation of biological process regulation of cardiac conduction regulation of heart contraction membrane depolarization during action potential membrane depolarization biological regulation membrane depolarization during cardiac muscle cell action potential action potential regulation of biological quality cardiac muscle cell action potential regulation of membrane potential heart process multicellular organismal process system process regulation of biological process regulation of cardiac conduction regulation of heart contraction regulation of system process circulatory system process regulation of blood circulation cardiac conduction regulation of multicellular organismal process heart contraction blood circulation regulation of heart rate positive regulation of the force of heart contraction regulation of the force of heart contraction cellular response to stimulus regulation of signaling regulation of cellular process response to stimulus negative regulation of signaling signaling negative regulation of response to stimulus negative regulation of intracellular signal transduction negative regulation of biological process regulation of signal transduction negative regulation of signal transduction negative regulation of cell communication intracellular signal transduction cell communication regulation of response to stimulus regulation of intracellular signal transduction negative regulation of cellular process regulation of cell communication cellular process signal transduction regulation of biosynthetic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process transport sodium ion export across plasma membrane monoatomic ion transmembrane transport sodium ion transmembrane transport export from cell export across plasma membrane establishment of localization metal ion transport monoatomic cation transmembrane transport transmembrane transport localization monoatomic ion transport monoatomic cation transport sodium ion transport cellular response to nitrogen compound cellular response to caffeine response to nitrogen compound response to purine-containing compound response to alkaloid cellular response to chemical stimulus response to chemical cellular response to alkaloid cellular response to purine-containing compound response to caffeine inorganic ion homeostasis intracellular calcium ion homeostasis homeostatic process calcium ion homeostasis cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis regulation of developmental process positive regulation of biological process regulation of biomineral tissue development regulation of bone mineralization positive regulation of ossification positive regulation of developmental process multicellular organism development positive regulation of biomineral tissue development ossification anatomical structure development biomineral tissue development developmental process regulation of multicellular organismal development bone mineralization animal organ development tissue development positive regulation of bone mineralization positive regulation of multicellular organismal process regulation of ossification animal gross anatomical part developmental process calcium ion transport calcium ion transmembrane transport calcium ion export across plasma membrane calcium ion import negative regulation of cytosolic calcium ion concentration regulation of calcium ion transport regulation of localization sarcoplasmic reticulum calcium ion transport release of sequestered calcium ion into cytosol by sarcoplasmic reticulum cardiac muscle contraction intercellular transport intracellular signaling cassette release of sequestered calcium ion into cytosol by endoplasmic reticulum regulation of release of sequestered calcium ion into cytosol regulation of monoatomic ion transport regulation of cardiac muscle contraction muscle contraction release of sequestered calcium ion into cytosol regulation of transmembrane transport regulation of striated muscle contraction calcium-mediated signaling regulation of muscle contraction regulation of monoatomic ion transmembrane transport regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion striated muscle contraction regulation of calcium ion transmembrane transport regulation of metal ion transport calcium ion transmembrane import into cytosol regulation of cardiac muscle contraction by calcium ion signaling regulation of transport muscle system process regulation of muscle system process regulation of monoatomic cation transmembrane transport regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum calcium ion export sodium ion homeostasis intracellular sodium ion homeostasis relaxation of cardiac muscle relaxation of muscle positive regulation of cytosolic calcium ion concentration calcium ion transport into cytosol regulation of cell communication by electrical coupling cell communication by electrical coupling cell communication by electrical coupling involved in cardiac conduction cell communication involved in cardiac conduction relaxation of smooth muscle import into cell import across plasma membrane sodium ion import across plasma membrane inorganic cation import across plasma membrane inorganic ion import across plasma membrane regulation of tube diameter vascular associated smooth muscle contraction regulation of tube size smooth muscle contraction vascular process in circulatory system blood vessel diameter maintenance vasoconstriction regulation of anatomical structure size cellular response to oxidative stress response to oxygen-containing compound cellular response to chemical stress cellular response to oxygen-containing compound response to reactive oxygen species cellular response to reactive oxygen species response to oxidative stress cellular response to stress response to stress cardiac muscle cell development cellular developmental process cell development muscle cell differentiation striated muscle tissue development muscle structure development striated muscle cell development muscle cell development cell differentiation cardiac cell development muscle tissue development system development heart development cardiac muscle tissue development cardiac muscle cell differentiation cardiocyte differentiation circulatory system development striated muscle cell differentiation response to mechanical stimulus response to abiotic stimulus response to external stimulus response to muscle stretch	cell periphery cellular anatomical structure sarcolemma plasma membrane membrane T-tubule intracellular anatomical structure intracellular membraneless organelle Z disc sarcomere intracellular organelle I band organelle membraneless organelle cell periphery cellular anatomical structure sarcolemma plasma membrane membrane T-tubule intracellular anatomical structure intracellular membraneless organelle Z disc sarcomere intracellular organelle I band organelle membraneless organelle contractile muscle fiber cytoplasm supramolecular fiber myofibril supramolecular polymer supramolecular complex somatodendritic compartment cell projection dendrite dendritic tree neuron projection plasma membrane bounded cell projection cell body neuronal cell body axon cell-cell junction intercalated disc anchoring junction cell junction cell-cell contact zone postsynapse synapse postsynaptic density neuron to neuron synapse postsynaptic specialization asymmetric synapse axon terminus presynapse distal axon neuron projection terminus
B [auth L]	Fab light chain	-	-	-
C [auth H]	Fab heavy chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR032452	Sodium/calcium exchanger domain, C-terminal extension	Domain
A	IPR044880	NCX, central ion-binding domain superfamily	Homologous Superfamily
A	IPR003644	Na-Ca exchanger/integrin-beta4	Domain
A	IPR051171	Calcium/Cation Antiporter	Family
A	IPR004837	Sodium/calcium exchanger membrane region	Domain
A	IPR001623	DnaJ domain	Domain
A	IPR004836	Sodium/calcium exchanger protein	Family
A	IPR038081	CalX-like domain superfamily	Homologous Superfamily
A	IPR002987	Sodium/calcium exchanger, isoform 1	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: P32418	status epilepticus Myocardial Reperfusion Injury visual epilepsy megacolon hydrolethalus syndrome malignant colon neoplasm malignant pancreatic neoplasm myocardial ischemia attention deficit hyperactivity disorder, inattentive type chronic obstructive pulmonary disease osteosarcoma cystic fibrosis pancreatic intraductal papillary-mucinous neoplasm exocrine pancreatic carcinoma Pick disease status epilepticus Myocardial Reperfusion Injury visual epilepsy megacolon hydrolethalus syndrome malignant colon neoplasm malignant pancreatic neoplasm myocardial ischemia attention deficit hyperactivity disorder, inattentive type chronic obstructive pulmonary disease osteosarcoma cystic fibrosis pancreatic intraductal papillary-mucinous neoplasm exocrine pancreatic carcinoma Pick disease primitive neuroectodermal tumor malignant ependymoma medulloblastoma astrocytic tumor tuberculosis atypical teratoid rhabdoid tumor ovarian cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia pilocytic astrocytoma glioblastoma psoriasis head and neck cancer large cell medulloblastoma malignant glioma Sjogren syndrome ulcerative colitis bone disease non-small cell lung carcinoma oligodendroglioma coronary artery disease pancreatic intraductal papillary-mucinous carcinoma pituitary cancer

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

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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.