Annotations: 8XQA

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, 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
A, B	Sperm-specific sodium proton exchanger	monoatomic cation transmembrane transporter activity metal cation:monoatomic cation antiporter activity proton transmembrane transporter activity sodium:proton antiporter activity sodium ion transmembrane transporter activity secondary active transmembrane transporter activity antiporter activity metal cation:proton antiporter activity active transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity monoatomic cation transmembrane transporter activity metal cation:monoatomic cation antiporter activity proton transmembrane transporter activity sodium:proton antiporter activity sodium ion transmembrane transporter activity secondary active transmembrane transporter activity antiporter activity metal cation:proton antiporter activity active transmembrane transporter activity inorganic molecular entity transmembrane transporter activity inorganic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity metal ion transmembrane transporter activity transmembrane transporter activity identical protein binding protein binding binding protein homodimerization activity protein dimerization activity adenyl ribonucleotide binding cyclic nucleotide binding nucleotide binding purine ribonucleotide binding nucleoside phosphate binding ion binding purine nucleotide binding anion binding cAMP binding adenyl nucleotide binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding guanyl nucleotide binding guanyl ribonucleotide binding cGMP binding potassium ion transmembrane transporter activity potassium:proton antiporter activity solute:potassium antiporter activity	import into cell transport monoatomic ion transmembrane transport import across plasma membrane sodium ion import across plasma membrane sodium ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation import across plasma membrane metal ion transport inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization inorganic ion import across plasma membrane import into cell transport monoatomic ion transmembrane transport import across plasma membrane sodium ion import across plasma membrane sodium ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation import across plasma membrane metal ion transport inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization inorganic ion import across plasma membrane monoatomic ion transport cellular process monoatomic cation transport sodium ion transport potassium ion transmembrane transport potassium ion transport homeostatic process biological regulation regulation of intracellular pH cellular homeostasis chemical homeostasis intracellular monoatomic cation homeostasis regulation of pH monoatomic ion homeostasis intracellular chemical homeostasis regulation of biological quality monoatomic cation homeostasis regulation of cellular pH intracellular monoatomic ion homeostasis sexual reproduction reproductive process fertilization single fertilization	membrane-bounded organelle cell projection cellular anatomical structure organelle cilium 9+2 motile cilium sperm flagellum motile cilium plasma membrane bounded cell projection cell periphery plasma membrane membrane sperm head

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR000595	Cyclic nucleotide-binding domain	Domain
A, B	IPR018422	Cation/H+ exchanger, CPA1 family	Family
A, B	IPR014710	RmlC-like jelly roll fold	Homologous Superfamily
A, B	IPR006153	Cation/H+ exchanger, transmembrane domain	Domain
A, B	IPR018490	Cyclic nucleotide-binding domain superfamily	Homologous Superfamily
A, B	IPR027359	Voltage-dependent channel domain superfamily	Homologous Superfamily

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

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

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Antiporters	sperm-specific Na⁺/H⁺ exchanger (SLC9C1), apo state, dimer

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.