PDZK1
Domain
The PDZ 2 and 3 domains seem to be involved in the interaction with SLC26A3.
Interaction with the C-terminus of CFTR could be mediated through independent binding of PDZ 1, 3 and 4 domains.
The PDZ 1 and 3 domains seem to be involved in the interaction with SLCO1A1.
The PDZ 1 domain interacts with BCR.
The PDZ 2 and 4 domains do not interact with the C-terminal region of SCARB1.
Function
A scaffold protein that connects plasma membrane proteins and regulatory components, regulating their surface expression in epithelial cells apical domains. May be involved in the coordination of a diverse range of regulatory processes for ion transport and second messenger cascades. In complex with NHERF1, may cluster proteins that are functionally dependent in a mutual fashion and modulate the trafficking and the activity of the associated membrane proteins. May play a role in the cellular mechanisms associated with multidrug resistance through its interaction with ABCC2 and PDZK1IP1. May potentiate the CFTR chloride channel activity. Required for normal cell-surface expression of SCARB1. Plays a role in maintaining normal plasma cholesterol levels via its effects on SCARB1. Plays a role in the normal localization and function of the chloride-anion exchanger SLC26A6 to the plasma membrane in the brush border of the proximal tubule of the kidney. May be involved in the regulation of proximal tubular Na(+)-dependent inorganic phosphate cotransport therefore playing an important role in tubule function (By similarity).
Sequence Similarities
Belongs to the NHER family.
Tissue Specificity
Expression is limited to epithelial cells. Expressed in the kidney (brush border of proximal tubule), pancreas, liver, and small intestine. Expressed at a lower level in the adrenal cortex, testis and stomach. Overexpressed in breast, renal and lung carcinomas.
Cellular localization
- Membrane
- Peripheral membrane protein
- Cell membrane
- Associated with peripheral membranes. Localizes to the apical compartment of proximal tubular cells and to sinusoidal liver membranes.
Alternative names
CAP70, NHERF3, PDZD1, PDZK1, Na(+)/H(+) exchange regulatory cofactor NHE-RF3, NHERF-3, CFTR-associated protein of 70 kDa, Na(+)/H(+) exchanger regulatory factor 3, Na/Pi cotransporter C-terminal-associated protein 1, PDZ domain-containing protein 1, Sodium-hydrogen exchanger regulatory factor 3, NaPi-Cap1