ATP1B3

The protein encoded by this gene belongs to the family of Na+/K+ and H+/K+ ATPases beta chain proteins, and to the subfamily of Na+/K+ -ATPases. Na+/K+ -ATPase is an integral membrane protein responsible for establishing and maintaining the electrochemical gradients of Na and K ions across the plasma membrane. These gradients are essential for osmoregulation, for sodium-coupled transport of a variety of organic and inorganic molecules, and for electrical excitability of nerve and muscle. This enzyme is composed of two subunits, a large catalytic subunit (alpha) and a smaller glycoprotein subunit (beta). The beta subunit regulates, through assembly of alpha/beta heterodimers, the number of sodium pumps transported to the plasma membrane. The glycoprotein subunit of Na+/K+ -ATPase is encoded by multiple genes. This gene encodes a beta 3 subunit. This gene encodes a beta 3 subunit. A pseudogene exists for this gene, and it is located on chromosome 2. [provided by RefSeq, Jul 2008]

ATPase Na+/K+ Transporting Subunit Beta 3

This is the non-catalytic component of the active enzyme, which catalyzes the hydrolysis of ATP coupled with the exchange of Na+ and K+ ions across the plasma membrane. The exact function of the beta-3 subunit is not known.

Cellular potassium ion homeostasis Source: BHF-UCL
Cellular sodium ion homeostasis Source: BHF-UCL
Ion transmembrane transport Source: Reactome
Leukocyte migration Source: Reactome
Membrane repolarization Source: BHF-UCL
Positive regulation of ATPase activity Source: BHF-UCL
Positive regulation of potassium ion import across plasma membrane Source: BHF-UCL
Positive regulation of potassium ion transmembrane transporter activity Source: BHF-UCL
Positive regulation of sodium ion export across plasma membrane Source: BHF-UCL
Potassium ion import across plasma membrane Source: BHF-UCL
Potassium ion transmembrane transport Source: ARUK-UCL
Protein localization to plasma membrane Source: BHF-UCL
Protein stabilization Source: BHF-UCL
Regulation of cardiac conduction Source: Reactome
Sodium ion export across plasma membrane Source: BHF-UCL
Sodium ion transmembrane transport Source: ARUK-UCL

Apical cell membrane; Basolateral cell membrane; Melanosome. Identified by mass spectrometry in melanosome fractions from stage I to stage IV.

Cytoplasmic: 1-35 aa
Helical: 36-56 aa
Extracellular: 57-279 aa